Update runtime

Fixes #1528
Ref #1526

.github/ISSUE_TEMPLATE

@@ -2,7 +2,7 @@
 
 ## Specifications
 
-You can use `micro -version` to get the commit hash.
+<!-- You can use `micro -version` to get the commit hash. -->
 
 Commit hash:
 OS:

.gitignore

@@ -15,4 +15,5 @@ tools/build-version
 tools/build-date
 tools/info-plist
 tools/bindata
+tools/vscode-tests/
 *.hdr

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2016-2017: Zachary Yedidia, et al.
+Copyright (c) 2016-2020: Zachary Yedidia, et al.
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

Makefile

@@ -8,14 +8,19 @@ DATE = $(shell GOOS=$(shell go env GOHOSTOS) GOARCH=$(shell go env GOHOSTARCH) \
 ADDITIONAL_GO_LINKER_FLAGS = $(shell GOOS=$(shell go env GOHOSTOS) \
 	GOARCH=$(shell go env GOHOSTARCH))
 GOBIN ?= $(shell go env GOPATH)/bin
-GOVARS = -X github.com/zyedidia/micro/internal/util.Version=$(VERSION) -X github.com/zyedidia/micro/internal/util.CommitHash=$(HASH) -X 'github.com/zyedidia/micro/internal/util.CompileDate=$(DATE)' -X github.com/zyedidia/micro/internal/util.Debug=OFF
+GOVARS = -X github.com/zyedidia/micro/internal/util.Version=$(VERSION) -X github.com/zyedidia/micro/internal/util.CommitHash=$(HASH) -X 'github.com/zyedidia/micro/internal/util.CompileDate=$(DATE)'
+DEBUGVAR = -X github.com/zyedidia/micro/internal/util.Debug=ON
+VSCODE_TESTS_BASE_URL = 'https://raw.githubusercontent.com/microsoft/vscode/e6a45f4242ebddb7aa9a229f85555e8a3bd987e2/src/vs/editor/test/common/model/'
 
 # Builds micro after checking dependencies but without updating the runtime
 build:
 	go build -ldflags "-s -w $(GOVARS) $(ADDITIONAL_GO_LINKER_FLAGS)" ./cmd/micro
 
 build-dbg:
-	go build -ldflags "-s -w $(ADDITIONAL_GO_LINKER_FLAGS)" ./cmd/micro
+	go build -ldflags "-s -w $(ADDITIONAL_GO_LINKER_FLAGS) $(DEBUGVAR)" ./cmd/micro
+
+build-tags: fetch-tags
+	go build -ldflags "-s -w $(GOVARS) $(ADDITIONAL_GO_LINKER_FLAGS)" ./cmd/micro
 
 # Builds micro after building the runtime and checking dependencies
 build-all: runtime build
@@ -35,6 +40,9 @@ install-all: runtime install
 install-quick:
 	go install -ldflags "-s -w $(GOVARS) $(ADDITIONAL_GO_LINKER_FLAGS)"  ./cmd/micro
 
+fetch-tags:
+	git fetch --tags
+
 # Builds the runtime
 runtime:
 	git submodule update --init
@@ -44,8 +52,20 @@ runtime:
 	mv runtime.go internal/config
 	gofmt -w internal/config/runtime.go
 
+testgen:
+	mkdir -p tools/vscode-tests
+	cd tools/vscode-tests && \
+	curl --remote-name-all $(VSCODE_TESTS_BASE_URL){editableTextModelAuto,editableTextModel,model.line}.test.ts
+	tsc tools/vscode-tests/*.ts > /dev/null; true
+	go run tools/testgen.go tools/vscode-tests/*.js > buffer_generated_test.go
+	mv buffer_generated_test.go internal/buffer
+	gofmt -w internal/buffer/buffer_generated_test.go
+
 test:
 	go test ./internal/...
 
+bench:
+	go test -bench=. ./internal/...
+
 clean:
 	rm -f micro

README.md

@@ -1,32 +1,35 @@
-# ![Micro](./assets/logo.png)
+<img alt="micro logo" src="./assets/micro-logo.svg" width="500px"/>
 
 [![Build Status](https://travis-ci.org/zyedidia/micro.svg?branch=master)](https://travis-ci.org/zyedidia/micro)
 [![Go Report Card](https://goreportcard.com/badge/github.com/zyedidia/micro)](https://goreportcard.com/report/github.com/zyedidia/micro)
-[![Join the chat at https://gitter.im/zyedidia/micro](https://badges.gitter.im/zyedidia/micro.svg)](https://gitter.im/zyedidia/micro?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![Release](https://img.shields.io/github/release/zyedidia/micro.svg?label=Release)](https://github.com/zyedidia/micro/releases)
 [![MIT License](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/zyedidia/micro/blob/master/LICENSE)
+[![Join the chat at https://gitter.im/zyedidia/micro](https://badges.gitter.im/zyedidia/micro.svg)](https://gitter.im/zyedidia/micro?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Snap Status](https://build.snapcraft.io/badge/zyedidia/micro.svg)](https://build.snapcraft.io/user/zyedidia/micro)
 
-Micro is a terminal-based text editor that aims to be easy to use and intuitive, while also taking advantage of the full capabilities
-of modern terminals. It comes as one single, batteries-included, static binary with no dependencies, and you can download and use it right now.
+**micro** is a terminal-based text editor that aims to be easy to use and intuitive, while also taking advantage of the capabilities
+of modern terminals. It comes as a single, batteries-included, static binary with no dependencies; you can download and use it right now!
 
-As the name indicates, micro aims to be somewhat of a successor to the nano editor by being easy to install and use in a pinch, but micro also aims to be
-enjoyable to use full time, whether you work in the terminal because you prefer it (like me), or because you need to (over ssh).
+As its name indicates, micro aims to be somewhat of a successor to the nano editor by being easy to install and use.
+It strives to be enjoyable as a full-time editor for people who prefer to work in a terminal, or those who regularly edit files over SSH.
 
 Here is a picture of micro editing its source code.
 
 ![Screenshot](./assets/micro-solarized.png)
 
-To see more screenshots of micro, showcasing all of the default colorschemes, see [here](http://zbyedidia.webfactional.com/micro/screenshots.html).
+To see more screenshots of micro, showcasing some of the default color schemes, see [here](http://zbyedidia.webfactional.com/micro/screenshots.html).
  
 You can also check out the website for Micro at https://micro-editor.github.io.
 
-# Table of Contents
+## Table of Contents
+
 - [Features](#features)
 - [Installation](#installation)
   - [Prebuilt binaries](#prebuilt-binaries)
   - [Package Managers](#package-managers)
   - [Building from source](#building-from-source)
-  - [MacOS terminal](#macos-terminal)
+  - [Fully static binary](#fully-static-binary)
+  - [macOS terminal](#macos-terminal)
   - [Linux clipboard support](#linux-clipboard-support)
   - [Colors and syntax highlighting](#colors-and-syntax-highlighting)
   - [Plan9, Cygwin, Mingw](#plan9-cygwin-mingw)
@@ -36,35 +39,38 @@ You can also check out the website for Micro at https://micro-editor.github.io.
 
 - - -
 
-# Features
+## Features
 
-* Easy to use and to install
-* No dependencies or external files are needed -- just the binary you can download further down the page
-* Multiple cursors
-* Common keybindings (ctrl-s, ctrl-c, ctrl-v, ctrl-z...)
-    * Keybindings can be rebound to your liking
-* Sane defaults
-    * You shouldn't have to configure much out of the box (and it is extremely easy to configure)
-* Splits and tabs
-* Nano-like menu to help you remember the keybindings
-* Extremely good mouse support
-    * This means mouse dragging to create a selection, double click to select by word, and triple click to select by line
-* Cross platform (It should work on all the platforms Go runs on)
-    * Note that while Windows is supported Mingw/Cygwin is not (see below)
-* Plugin system (plugins are written in Lua)
-* Persistent undo
-* Automatic linting and error notifications
-* Syntax highlighting (for over [120 languages](runtime/syntax)!)
-* Colorscheme support
-    * By default, micro comes with 16, 256, and true color themes.
-* True color support (set the `MICRO_TRUECOLOR` environment variable to 1 to enable it)
-* Copy and paste with the system clipboard
-* Small and simple
-* Easily configurable
-* Macros
-* Common editor things such as undo/redo, line numbers, Unicode support, softwrap...
+- Easy to use and install.
+- No dependencies or external files are needed — just the binary you can download further down the page.
+- Multiple cursors.
+- Common keybindings (<kbd>Ctrl+S</kbd>, <kbd>Ctrl+C</kbd>, <kbd>Ctrl+V</kbd>, <kbd>Ctrl+Z</kbd>, …).
+  - Keybindings can be rebound to your liking.
+- Sane defaults.
+  - You shouldn't have to configure much out of the box (and it is extremely easy to configure).
+- Splits and tabs.
+- nano-like menu to help you remember the keybindings.
+- Extremely good mouse support.
+  - This means mouse dragging to create a selection, double click to select by word, and triple click to select by line.
+- Cross-platform (it should work on all the platforms Go runs on).
+  - Note that while Windows is supported Mingw/Cygwin is not (see below)
+- Plugin system (plugins are written in Lua).
+  - micro has a built-in plugin manager to automatically install, remove, and update plugins.
+- Built-in diff gutter
+- Simple autocompletion
+- Persistent undo.
+- Automatic linting and error notifications
+- Syntax highlighting for over [130 languages](runtime/syntax).
+- Color scheme support.
+  - By default, micro comes with 16, 256, and true color themes.
+- True color support (set the `MICRO_TRUECOLOR` environment variable to 1 to enable it).
+- Copy and paste with the system clipboard.
+- Small and simple.
+- Easily configurable.
+- Macros.
+- Common editor features such as undo/redo, line numbers, Unicode support, soft wrapping, …
 
-# Installation
+## Installation
 
 To install micro, you can download a [prebuilt binary](https://github.com/zyedidia/micro/releases), or you can build it from source.
 
@@ -79,19 +85,19 @@ Download the binary from the [releases](https://github.com/zyedidia/micro/releas
 On that page you'll see the nightly release, which contains binaries for micro which are built every night,
 and you'll see all the stable releases with the corresponding binaries.
 
-If you'd like to see more information after installing micro, run `micro -version`.
+Running `micro -version` will give you the version information.
 
 ### Installation script
 
-There is a great script which can install micro for you by downloading the latest prebuilt binary. You can find it at https://getmic.ro (the github repo for it is [here](https://github.com/benweissmann/getmic.ro)).
+There is a script which can install micro for you by downloading the latest prebuilt binary. You can find it at <https://getmic.ro>.
 
-Then you can easily install micro:
+You can easily install micro by running
 
-    $ curl https://getmic.ro | bash
+```bash
+curl https://getmic.ro | bash
+```
 
-The script will install the micro binary to the current directory.
-
-See the [Github page](https://github.com/benweissmann/getmic.ro) for more information.
+The script will install the micro binary to the current directory. See its [GitHub repository](https://github.com/benweissmann/getmic.ro) for more information.
 
 ### Package managers
 
@@ -101,13 +107,18 @@ You can install micro using Homebrew on Mac:
 brew install micro
 ```
 
-On Debian Linux, you can install micro through [snap](https://snapcraft.io/docs/core/install)
+On Linux, you can install micro through [snap](https://snapcraft.io/docs/core/install)
 
 ```
 snap install micro --classic
 ```
 
-Homebrew and snap are the two "officially" maintained package manager distributions of micro.
+On Debian `unstable | testing | buster-backports` and Ubuntu `focal` (20.04), micro is available
+via `apt`:
+
+```
+sudo apt install micro
+```
 
 Micro is also available through other package managers on Linux such as AUR, Nix, and package managers
 for other operating systems:
@@ -117,6 +128,8 @@ for other operating systems:
     * `scoop install micro`
 * OpenBSD: Available in the ports tree and also available as a binary package
     * `pkd_add -v micro`
+* Arch Linux, CRUX, Termux for Android
+    * See details in the [wiki page](https://github.com/zyedidia/micro/wiki/Installing-Micro)
 
 ### Building from source
 
@@ -137,55 +150,67 @@ anywhere you like (for example `/usr/local/bin`).
 The command `make install` will install the binary to `$GOPATH/bin` or `$GOBIN`.
 
 You can install directly with `go get` (`go get github.com/zyedidia/micro/cmd/micro`) but this isn't
-recommended because it doesn't build micro with version information, and doesn't disable debug mode.
+recommended because it doesn't build micro with version information (necessary for the plugin manager),
+and doesn't disable debug mode.
 
-### MacOS terminal
+### Fully static binary
 
-If you are using MacOS, you should consider using [iTerm2](http://iterm2.com/) instead of the default Mac terminal. The iTerm2 terminal has much better mouse support as well as better handling of key events. For best keybinding behavior, choose `xterm defaults` under `Preferences->Profiles->Keys->Load Preset`. The newest versions also support true color.
+By default, the micro binary will dynamically link with core system libraries (this is generally
+recommended for security and portability). However, there is a fully static prebuilt binary that
+is provided for amd64 as `linux-static.tar.gz`, and to build a fully static binary from source, run
+
+```
+CGO_ENABLED=0 make build
+```
+
+### macOS terminal
+
+If you are using macOS, you should consider using [iTerm2](http://iterm2.com/) instead of the default terminal (Terminal.app). The iTerm2 terminal has much better mouse support as well as better handling of key events. For best keybinding behavior, choose `xterm defaults` under `Preferences->Profiles->Keys->Load Preset`. The newest versions also support true color.
 
 If you still insist on using the default Mac terminal, be sure to set `Use Option key as Meta key` under
 `Preferences->Profiles->Keyboard` to use <kbd>option</kbd> as <kbd>alt</kbd>.
 
 ### Linux clipboard support
 
-On Linux, clipboard support requires the 'xclip' or 'xsel' commands to be installed.
+On Linux, clipboard support requires:
 
-For Ubuntu:
+- On X11, the `xclip` or `xsel` commands (for Ubuntu: `sudo apt install xclip`)
+- On Wayland, the `wl-clipboard` command
 
-```sh
-sudo apt-get install xclip
-```
-
-If you don't have xclip or xsel, micro will use an internal clipboard for copy and paste, but it won't work with external applications.
+If you don't have these commands, micro will use an internal clipboard for copy and paste, but it won't work with external applications.
 
 ### Colors and syntax highlighting
 
 If you open micro and it doesn't seem like syntax highlighting is working, this is probably because
-you are using a terminal which does not support 256 colors. Try changing the colorscheme to `simple`
-by pressing CtrlE in micro and typing `set colorscheme simple`.
+you are using a terminal which does not support 256 color mode. Try changing the color scheme to `simple`
+by pressing <kbd>Ctrl+E</kbd> in micro and typing `set colorscheme simple`.
 
 If you are using the default Ubuntu terminal, to enable 256 make sure your `TERM` variable is set
 to `xterm-256color`.
 
-Many older Windows terminals don't support more than 16 colors, which means
-that micro's default colorscheme won't look very good. You can either set
-the colorscheme to `simple`, or download a better terminal emulator, like
-mintty. However, if you are on a recent version of Windows 10, the default
-`cmd.exe` should do fine.
+Many of the Windows terminals don't support more than 16 colors, which means
+that micro's default color scheme won't look very good. You can either set
+the color scheme to `simple`, or download and configure a better terminal emulator
+than the Windows default.
 
-### Plan9, Cygwin, Mingw
+### Cygwin, Mingw, Plan9
 
-These platforms are unfortunately not supported.
+Cygwin, Mingw, and Plan9 are unfortunately not officially supported. In Cygwin and Mingw, micro will often work when run using
+the `winpty` utility:
+
+```
+winpty micro.exe ...
+```
 
 Micro uses the amazing [tcell library](https://github.com/gdamore/tcell), but this
 means that micro is restricted to the platforms tcell supports. As a result, micro does not support
-Plan9, and Cygwin (although this may change in the future). Micro also doesn't support NaCl (but NaCl is deprecated anyways).
+Plan9, and Cygwin (although this may change in the future). Micro also doesn't support NaCl (which is deprecated anyway).
 
-# Usage
+## Usage
 
-Once you have built the editor, simply start it by running `micro path/to/file.txt` or simply `micro` to open an empty buffer.
+Once you have built the editor, start it by running `micro path/to/file.txt` or `micro` to open an empty buffer.
 
-Micro also supports creating buffers from `stdin`:
+micro also supports creating buffers from `stdin`:
 
 ```sh
 ifconfig | micro
@@ -197,22 +222,22 @@ You can also use the mouse to manipulate the text. Simply clicking and dragging
 will select text. You can also double click to enable word selection, and triple
 click to enable line selection.
 
-# Documentation and Help
+## Documentation and Help
 
-Micro has a built-in help system which you can access by pressing `Ctrl-E` and typing `help`. Additionally, you can
+micro has a built-in help system which you can access by pressing <kbd>Ctrl+E</kbd> and typing `help`. Additionally, you can
 view the help files here:
 
-* [main help](https://github.com/zyedidia/micro/tree/master/runtime/help/help.md)
-* [keybindings](https://github.com/zyedidia/micro/tree/master/runtime/help/keybindings.md)
-* [commands](https://github.com/zyedidia/micro/tree/master/runtime/help/commands.md)
-* [colors](https://github.com/zyedidia/micro/tree/master/runtime/help/colors.md)
-* [options](https://github.com/zyedidia/micro/tree/master/runtime/help/options.md)
-* [plugins](https://github.com/zyedidia/micro/tree/master/runtime/help/plugins.md)
+- [main help](https://github.com/zyedidia/micro/tree/master/runtime/help/help.md)
+- [keybindings](https://github.com/zyedidia/micro/tree/master/runtime/help/keybindings.md)
+- [commands](https://github.com/zyedidia/micro/tree/master/runtime/help/commands.md)
+- [colors](https://github.com/zyedidia/micro/tree/master/runtime/help/colors.md)
+- [options](https://github.com/zyedidia/micro/tree/master/runtime/help/options.md)
+- [plugins](https://github.com/zyedidia/micro/tree/master/runtime/help/plugins.md)
 
 I also recommend reading the [tutorial](https://github.com/zyedidia/micro/tree/master/runtime/help/tutorial.md) for
 a brief introduction to the more powerful configuration features micro offers.
 
-# Contributing
+## Contributing
 
 If you find any bugs, please report them! I am also happy to accept pull requests from anyone.
 

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+       id="path13"
+       inkscape:connector-curvature="0" /></g><path
+     d="M 51.6,0 C 23.1,0 0,23.1 0,51.6 c 0,28.5 23.1,51.6 51.6,51.6 28.5,0 51.6,-23.1 51.6,-51.6 C 103.2,23.1 80.1,0 51.6,0 Z m 24.5,58.6 c -0.5,2 -1.3,3.6 -2.4,4.9 -1,1.3 -2,2.1 -3.1,2.5 -1.1,0.4 -2.2,0.6 -3.4,0.6 -1.2,0 -2.2,-0.2 -3,-0.7 C 63.4,65.5 62.8,64.8 62.3,64 61.8,63.2 61.5,62.2 61.3,61.1 61.1,60 61,58.8 61,57.5 c 0,-0.5 0,-1 0.1,-1.7 0.1,-0.7 0.2,-1.6 0.3,-1.6 l -0.2,0 c -1.6,4 -3.8,6.9 -6.6,9.2 -2.8,2.3 -5.9,3.4 -9.3,3.4 -2.3,0 -4.2,-0.9 -5.5,-2.6 -1.4,-1.7 -2.1,-4.3 -2.1,-7.7 0,-0.5 0,-1 0.1,-1.6 0.1,-0.5 0.1,-0.7 0.2,-1.7 l -0.7,0 c -0.9,2 -1.7,4.8 -2.3,7.3 -0.6,2.5 -1.1,4.8 -1.4,6.9 -0.4,2.1 -0.6,4 -0.8,5.6 -0.2,1.6 -0.3,2.7 -0.4,3.3 0.1,0.5 0.2,1 0.3,1.6 0.2,0.6 0.3,1.2 0.5,1.7 0.2,0.5 0.3,1.1 0.4,1.6 0.1,0.5 0.2,0.9 0.2,1.2 0,1.4 -0.3,2.5 -0.9,3.2 -0.6,0.7 -1.3,1.1 -2,1.1 -0.9,0 -1.7,-0.3 -2.3,-0.8 -0.7,-0.6 -1,-1.5 -1,-2.7 0,-1.7 0.3,-3.9 0.9,-6.5 0.6,-2.6 1.5,-5.9 2.6,-9.8 0.6,-1.8 1.1,-3.6 1.7,-5.4 0.6,-1.8 1.1,-3.5 1.6,-5 0.5,-1.5 0.9,-2.9 1.3,-4.1 0.4,-1.2 0.6,-2.1 0.7,-2.8 0.1,-0.3 0.2,-1 0.3,-2 0.1,-1 0.2,-2.1 0.4,-3.4 0.2,-1.3 0.3,-2.7 0.5,-4.1 0.2,-1.5 0.4,-2.8 0.5,-4 0.2,-0.9 0.3,-1.9 0.5,-3 0.2,-1.1 0.5,-2.2 0.9,-3.1 0.4,-1 1,-1.8 1.7,-2.5 0.7,-0.7 1.6,-1 2.7,-1 1.2,0 2,0.4 2.4,1.1 0.4,0.7 0.6,1.6 0.5,2.6 -0.1,1 -0.2,2.1 -0.5,3.2 -0.3,1.1 -0.6,2.1 -0.9,2.9 -0.8,2.5 -1.6,4.8 -2.5,6.7 -0.9,1.9 -1.7,4 -2.4,6.2 -0.6,1.5 -0.8,2.9 -0.8,4.1 0,2.2 0.7,3.8 2,5 1.4,1.2 3,1.7 4.9,1.7 1.5,0 3,-0.5 4.4,-1.6 1.4,-1.1 2.7,-2.4 3.9,-3.9 1.2,-1.5 2.2,-3.1 3,-4.9 0.8,-1.7 1.4,-3.3 1.8,-4.6 0.1,-0.2 0.2,-0.6 0.3,-1.4 0.2,-0.8 0.3,-1.7 0.5,-2.7 0.2,-1 0.4,-2 0.6,-3.1 0.2,-1.1 0.4,-2 0.5,-2.7 0.2,-0.8 0.3,-1.6 0.5,-2.6 0.2,-1 0.5,-1.9 0.9,-2.8 0.4,-0.9 1,-1.6 1.6,-2.2 0.7,-0.6 1.5,-0.9 2.6,-0.9 1.3,0 2.1,0.4 2.6,1.1 0.4,0.7 0.6,1.6 0.6,2.6 -0.1,1 -0.2,2 -0.5,3 -0.3,1 -0.5,1.8 -0.7,2.4 -0.8,2.5 -1.6,4.7 -2.4,6.7 -0.8,2 -1.5,3.8 -2.2,5.2 -0.6,1.5 -1.1,2.6 -1.5,3.5 -0.4,0.9 -0.6,1.5 -0.6,1.8 0,2.6 0.6,4.5 1.7,5.6 1.1,1.1 2.3,1.7 3.6,1.7 2.2,0 3.9,-0.7 5.2,-2 1.3,-1.4 2.3,-3.9 2.9,-6.9 l 0.8,0 c 0.2,2.9 -0.1,5.3 -0.6,7.3 z"
+     id="path15"
+     inkscape:connector-curvature="0"
+     style="fill:#2e3192" /></svg>

assets/packaging/micro.1

@@ -1,11 +1,4 @@
-.\" micro manual page - micro(1)
-.\" 
-.\" Copyright © 2017 Zachary Yedidia <zyedidia@gmail.com>
-.\" Copyright © 2017 Collin Warren <anatoly@somethinghub.com>
-.\"
-.\" This document is provided under the same licensing as micro.
-.\" See \usr\share\doc\micro\LICENSE for more information.
-.TH micro 1 "2017-03-28"
+.TH micro 1 "2020-02-10"
 .SH NAME
 micro \- A modern and intuitive terminal-based text editor
 .SH SYNOPSIS
@@ -22,39 +15,96 @@ As the name indicates, micro aims to be somewhat of a successor to the nano edit
 enjoyable to use full time, whether you work in the terminal because you prefer it (like me), or because you need to (over ssh).
 
 .SH OPTIONS
+.PP
+\-clean
+.RS 4
+Cleans the configuration directory
+.RE
+
 .PP
 \-config-dir dir
 .RS 4
 Specify a custom location for the configuration directory
 .RE
+
 .PP
-\-startpos LINE,COL
+[FILE]:LINE:COL
 .RS 4
 Specify a line and column to start the cursor at when opening a buffer
 .RE
+
 .PP
 \-options
 .RS 4
 Show all option help
 .RE
+
+.PP
+\-debug
+.RS 4
+Enable debug mode (enables logging to ./log.txt)
+.RE
+
 .PP
 \-version
 .RS 4
 Show the version number and information
 .RE
 
+Micro's plugin's can be managed at the command line with the following commands.
+.RS 4
+
+.PP
+\-plugin remove [PLUGIN]...
+.RS 4
+Remove plugin(s)
+.RE
+
+.PP
+\-plugin update [PLUGIN]...
+.RS 4
+Update plugin(s) (if no argument is given, updates all plugins)
+.RE
+
+.PP
+\-plugin search [PLUGIN]...
+.RS 4
+Search for a plugin
+.RE
+
+.PP
+\-plugin list
+.RS 4
+List installed plugins
+.RE
+
+.PP
+\-plugin available
+.RS 4
+List available plugins
+.RE
+.RE
+
+Micro's options can also be set via command line arguments for quick
+adjustments. For real configuration, please use the settings.json
+file (see 'help options').
+.RS 4
+
+.PP
+\-option value
+.RS 4
+Set `option` to `value` for this session
+For example: `micro -syntax off file.c`
+.RE
+
+
 .SH CONFIGURATION
 
-Micro uses
-\fI$XDG_CONFIG_HOME/micro\fR
-for configuration by default. If it is not set, micro uses ~/.config/micro.
-Two main configuration files are settings.json, containing the user's
-settings, and bindings.json, containing the user's custom keybindings.
-
-.SH ENVIRONMENT
-Micro's behaviour can be changed by setting environment variables, of which there is currently only one:
-\fIMICRO_TRUECOLOR\fR.
-When MICRO_TRUECOLOR is set to 1, micro will attempt to treat your terminal as a true-color terminal and will be able to make full use of the true-color colorschemes that are included with micro. If MICRO_TRUECOLOR is not set or is set to 0, then micro will only make use of 256 color features and will internally map true-color colorschemes to the nearest colors available. For more information see micro's documentation.
+Micro uses $MICRO_CONFIG_HOME as the configuration directory.
+If this environment variable is not set, it uses $XDG_CONFIG_HOME/micro instead.
+If that environment variable is not set, it uses ~/.config/micro as the configuration directory.
+In the documentation, we use ~/.config/micro to refer to the configuration directory
+(even if it may in fact be somewhere else if you have set either of the above environment variables).
 
 .SH NOTICE
 This manpage is intended only to serve as a quick guide to the invocation of 
@@ -69,5 +119,5 @@ and to report any newly encountered bugs you may find. We strive to correct
 bugs as swiftly as possible.
 
 .SH COPYRIGHT
-Copyright \(co 2017 Zachary Yedidia, Collin Warren, et al.
+Copyright \(co 2020 Zachary Yedidia, et al.
 See /usr/share/doc/micro/LICENSE and /usr/share/doc/micro/AUTHORS for more information.

cmd/micro/micro.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/go-errors/errors"
 	isatty "github.com/mattn/go-isatty"
+	lua "github.com/yuin/gopher-lua"
 	"github.com/zyedidia/micro/internal/action"
 	"github.com/zyedidia/micro/internal/buffer"
 	"github.com/zyedidia/micro/internal/config"
@@ -218,9 +219,6 @@ func main() {
 
 	screen.Init()
 
-	// If we have an error, we can exit cleanly and not completely
-	// mess up the terminal being worked in
-	// In other words we need to shut down tcell before the program crashes
 	defer func() {
 		if err := recover(); err != nil {
 			screen.Screen.Fini()
@@ -280,52 +278,68 @@ func main() {
 
 	// clear the drawchan so we don't redraw excessively
 	// if someone requested a redraw before we started displaying
-	for len(screen.DrawChan) > 0 {
-		<-screen.DrawChan
+	for len(screen.DrawChan()) > 0 {
+		<-screen.DrawChan()
 	}
 
-	var event tcell.Event
-
 	// wait for initial resize event
 	select {
-	case event = <-events:
+	case event := <-events:
 		action.Tabs.HandleEvent(event)
 	case <-time.After(10 * time.Millisecond):
 		// time out after 10ms
 	}
 
+	// Since this loop is very slow (waits for user input every time) it's
+	// okay to be inefficient and run it via a function every time
+	// We do this so we can recover from panics without crashing the editor
 	for {
-		// Display everything
-		screen.Screen.Fill(' ', config.DefStyle)
-		screen.Screen.HideCursor()
-		action.Tabs.Display()
-		for _, ep := range action.MainTab().Panes {
-			ep.Display()
-		}
-		action.MainTab().Display()
-		action.InfoBar.Display()
-		screen.Screen.Show()
-
-		event = nil
-
-		// Check for new events
-		select {
-		case f := <-shell.Jobs:
-			// If a new job has finished while running in the background we should execute the callback
-			f.Function(f.Output, f.Args)
-		case <-config.Autosave:
-			for _, b := range buffer.OpenBuffers {
-				b.Save()
-			}
-		case <-shell.CloseTerms:
-		case event = <-events:
-		case <-screen.DrawChan:
-		}
-
-		if action.InfoBar.HasPrompt {
-			action.InfoBar.HandleEvent(event)
-		} else {
-			action.Tabs.HandleEvent(event)
-		}
+		DoEvent()
+	}
+}
+
+// DoEvent runs the main action loop of the editor
+func DoEvent() {
+	var event tcell.Event
+
+	// recover from errors without crashing the editor
+	defer func() {
+		if err := recover(); err != nil {
+			if e, ok := err.(*lua.ApiError); ok {
+				screen.TermMessage("Lua API error:", e)
+			} else {
+				screen.TermMessage("Micro encountered an error:", errors.Wrap(err, 2).ErrorStack(), "\nIf you can reproduce this error, please report it at https://github.com/zyedidia/micro/issues")
+			}
+		}
+	}()
+	// Display everything
+	screen.Screen.Fill(' ', config.DefStyle)
+	screen.Screen.HideCursor()
+	action.Tabs.Display()
+	for _, ep := range action.MainTab().Panes {
+		ep.Display()
+	}
+	action.MainTab().Display()
+	action.InfoBar.Display()
+	screen.Screen.Show()
+
+	// Check for new events
+	select {
+	case f := <-shell.Jobs:
+		// If a new job has finished while running in the background we should execute the callback
+		f.Function(f.Output, f.Args)
+	case <-config.Autosave:
+		for _, b := range buffer.OpenBuffers {
+			b.Save()
+		}
+	case <-shell.CloseTerms:
+	case event = <-events:
+	case <-screen.DrawChan():
+	}
+
+	if action.InfoBar.HasPrompt {
+		action.InfoBar.HandleEvent(event)
+	} else {
+		action.Tabs.HandleEvent(event)
 	}
 }

go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/mattn/go-isatty v0.0.11
 	github.com/mattn/go-runewidth v0.0.7
 	github.com/mitchellh/go-homedir v1.1.0
+	github.com/robertkrimen/otto v0.0.0-20191219234010-c382bd3c16ff
 	github.com/sergi/go-diff v1.1.0
 	github.com/stretchr/testify v1.4.0
 	github.com/yuin/gopher-lua v0.0.0-20191220021717-ab39c6098bdb
@@ -16,9 +17,10 @@ require (
 	github.com/zyedidia/highlight v0.0.0-20170330143449-201131ce5cf5
 	github.com/zyedidia/json5 v0.0.0-20200102012142-2da050b1a98d
 	github.com/zyedidia/pty v2.0.0+incompatible // indirect
-	github.com/zyedidia/tcell v1.4.2
+	github.com/zyedidia/tcell v1.4.4
 	github.com/zyedidia/terminal v0.0.0-20180726154117-533c623e2415
 	golang.org/x/text v0.3.2
+	gopkg.in/sourcemap.v1 v1.0.5 // indirect
 	gopkg.in/yaml.v2 v2.2.7
 	layeh.com/gopher-luar v1.0.7
 )

go.sum

@@ -29,6 +29,8 @@ github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/robertkrimen/otto v0.0.0-20191219234010-c382bd3c16ff h1:+6NUiITWwE5q1KO6SAfUX918c+Tab0+tGAM/mtdlUyA=
+github.com/robertkrimen/otto v0.0.0-20191219234010-c382bd3c16ff/go.mod h1:xvqspoSXJTIpemEonrMDFq6XzwHYYgToXWj5eRX1OtY=
 github.com/sergi/go-diff v1.1.0 h1:we8PVUC3FE2uYfodKH/nBHMSetSfHDR6scGdBi+erh0=
 github.com/sergi/go-diff v1.1.0/go.mod h1:STckp+ISIX8hZLjrqAeVduY0gWCT9IjLuqbuNXdaHfM=
 github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
@@ -50,8 +52,8 @@ github.com/zyedidia/poller v1.0.1 h1:Tt9S3AxAjXwWGNiC2TUdRJkQDZSzCBNVQ4xXiQ7440s
 github.com/zyedidia/poller v1.0.1/go.mod h1:vZXJOHGDcuK08GXhF6IAY0ZFd2WcgOR5DOTp84Uk5eE=
 github.com/zyedidia/pty v2.0.0+incompatible h1:Ou5vXL6tvjst+RV8sUFISbuKDnUJPhnpygApMFGweqw=
 github.com/zyedidia/pty v2.0.0+incompatible/go.mod h1:4y9l9yJZNxRa7GB/fB+mmDmGkG3CqmzLf4vUxGGotEA=
-github.com/zyedidia/tcell v1.4.2 h1:JWMDs6O1saINPIR5M3kNqlWJwkfnBZeZDZszEJi3BW8=
-github.com/zyedidia/tcell v1.4.2/go.mod h1:HhlbMSCcGX15rFDB+Q1Lk3pKEOocsCUAQC3zhZ9sadA=
+github.com/zyedidia/tcell v1.4.4 h1:o34LXujNuSueuyTy+5eoQW+rQr8g0UbY8k1NczZyskQ=
+github.com/zyedidia/tcell v1.4.4/go.mod h1:HhlbMSCcGX15rFDB+Q1Lk3pKEOocsCUAQC3zhZ9sadA=
 github.com/zyedidia/terminal v0.0.0-20180726154117-533c623e2415 h1:752dTQ5OatJ9M5ULK2+9lor+nzyZz+LYDo3WGngg3Rc=
 github.com/zyedidia/terminal v0.0.0-20180726154117-533c623e2415/go.mod h1:8leT8G0Cm8NoJHdrrKHyR9MirWoF4YW7pZh06B6H+1E=
 golang.org/x/sys v0.0.0-20190204203706-41f3e6584952/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -65,6 +67,8 @@ golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGm
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/sourcemap.v1 v1.0.5 h1:inv58fC9f9J3TK2Y2R1NPntXEn3/wjWHkonhIUODNTI=
+gopkg.in/sourcemap.v1 v1.0.5/go.mod h1:2RlvNNSMglmRrcvhfuzp4hQHwOtjxlbjX7UPY/GXb78=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.7 h1:VUgggvou5XRW9mHwD/yXxIYSMtY0zoKQf/v226p2nyo=

internal/action/actions.go

@@ -283,7 +283,7 @@ func (h *BufPane) SelectWordLeft() bool {
 	return true
 }
 
-// StartOfLine moves the cursor to the start of the text of the line
+// StartOfText moves the cursor to the start of the text of the line
 func (h *BufPane) StartOfText() bool {
 	h.Cursor.Deselect(true)
 	h.Cursor.StartOfText()
@@ -396,6 +396,7 @@ func (h *BufPane) CursorStart() bool {
 	h.Cursor.Deselect(true)
 	h.Cursor.X = 0
 	h.Cursor.Y = 0
+	h.Cursor.StoreVisualX()
 	h.Relocate()
 	return true
 }
@@ -566,6 +567,20 @@ func (h *BufPane) IndentSelection() bool {
 	return false
 }
 
+// IndentLine moves the current line forward one indentation
+func (h *BufPane) IndentLine() bool {
+	if h.Cursor.HasSelection() {
+		return false
+	}
+
+	tabsize := int(h.Buf.Settings["tabsize"].(float64))
+	indentstr := h.Buf.IndentString(tabsize)
+	h.Buf.Insert(buffer.Loc{X: 0, Y: h.Cursor.Y}, indentstr)
+	h.Buf.RelocateCursors()
+	h.Relocate()
+	return true
+}
+
 // OutdentLine moves the current line back one indentation
 func (h *BufPane) OutdentLine() bool {
 	if h.Cursor.HasSelection() {
@@ -620,6 +635,11 @@ func (h *BufPane) Autocomplete() bool {
 		return false
 	}
 
+	if !util.IsNonAlphaNumeric(h.Cursor.RuneUnder(h.Cursor.X)) {
+		// don't autocomplete if cursor is on alpha numeric character (middle of a word)
+		return false
+	}
+
 	if b.HasSuggestions {
 		b.CycleAutocomplete(true)
 		return true
@@ -659,23 +679,27 @@ func (h *BufPane) SaveAll() bool {
 	return true
 }
 
-// Save the buffer to disk
-func (h *BufPane) Save() bool {
+// SaveCB performs a save and does a callback at the very end (after all prompts have been resolved)
+func (h *BufPane) SaveCB(action string, callback func()) bool {
 	// If this is an empty buffer, ask for a filename
 	if h.Buf.Path == "" {
-		h.SaveAs()
+		h.SaveAsCB(action, callback)
 	} else {
-		noPrompt := h.saveBufToFile(h.Buf.Path, "Save")
+		noPrompt := h.saveBufToFile(h.Buf.Path, action, callback)
 		if noPrompt {
 			return true
 		}
 	}
-
 	return false
 }
 
-// SaveAs saves the buffer to disk with the given name
-func (h *BufPane) SaveAs() bool {
+// Save the buffer to disk
+func (h *BufPane) Save() bool {
+	return h.SaveCB("Save", nil)
+}
+
+// SaveAsCB performs a save as and does a callback at the very end (after all prompts have been resolved)
+func (h *BufPane) SaveAsCB(action string, callback func()) bool {
 	InfoBar.Prompt("Filename: ", "", "Save", nil, func(resp string, canceled bool) {
 		if !canceled {
 			// the filename might or might not be quoted, so unquote first then join the strings.
@@ -689,35 +713,50 @@ func (h *BufPane) SaveAs() bool {
 				return
 			}
 			filename := strings.Join(args, " ")
-			noPrompt := h.saveBufToFile(filename, "SaveAs")
+			noPrompt := h.saveBufToFile(filename, action, callback)
 			if noPrompt {
-				h.completeAction("SaveAs")
+				h.completeAction(action)
 			}
 		}
 	})
 	return false
 }
 
+// SaveAs saves the buffer to disk with the given name
+func (h *BufPane) SaveAs() bool {
+	return h.SaveAsCB("SaveAs", nil)
+}
+
 // This function saves the buffer to `filename` and changes the buffer's path and name
 // to `filename` if the save is successful
-func (h *BufPane) saveBufToFile(filename string, action string) bool {
+func (h *BufPane) saveBufToFile(filename string, action string, callback func()) bool {
 	err := h.Buf.SaveAs(filename)
 	if err != nil {
 		if strings.HasSuffix(err.Error(), "permission denied") {
-			InfoBar.YNPrompt("Permission denied. Do you want to save this file using sudo? (y,n)", func(yes, canceled bool) {
-				if yes && !canceled {
-					err = h.Buf.SaveAsWithSudo(filename)
-					if err != nil {
-						InfoBar.Error(err)
-					} else {
-						h.Buf.Path = filename
-						h.Buf.SetName(filename)
-						InfoBar.Message("Saved " + filename)
-					}
-					h.completeAction(action)
+			saveWithSudo := func() {
+				err = h.Buf.SaveAsWithSudo(filename)
+				if err != nil {
+					InfoBar.Error(err)
+				} else {
+					h.Buf.Path = filename
+					h.Buf.SetName(filename)
+					InfoBar.Message("Saved " + filename)
 				}
-			})
-			return false
+			}
+			if h.Buf.Settings["autosu"].(bool) {
+				saveWithSudo()
+			} else {
+				InfoBar.YNPrompt("Permission denied. Do you want to save this file using sudo? (y,n)", func(yes, canceled bool) {
+					if yes && !canceled {
+						saveWithSudo()
+						h.completeAction(action)
+					}
+					if callback != nil {
+						callback()
+					}
+				})
+				return false
+			}
 		} else {
 			InfoBar.Error(err)
 		}
@@ -726,6 +765,9 @@ func (h *BufPane) saveBufToFile(filename string, action string) bool {
 		h.Buf.SetName(filename)
 		InfoBar.Message("Saved " + filename)
 	}
+	if callback != nil {
+		callback()
+	}
 	return true
 }
 
@@ -1040,11 +1082,15 @@ func (h *BufPane) JumpToMatchingBrace() bool {
 		r := h.Cursor.RuneUnder(h.Cursor.X)
 		rl := h.Cursor.RuneUnder(h.Cursor.X - 1)
 		if r == bp[0] || r == bp[1] || rl == bp[0] || rl == bp[1] {
-			matchingBrace, left := h.Buf.FindMatchingBrace(bp, h.Cursor.Loc)
-			if left {
-				h.Cursor.GotoLoc(matchingBrace)
+			matchingBrace, left, found := h.Buf.FindMatchingBrace(bp, h.Cursor.Loc)
+			if found {
+				if left {
+					h.Cursor.GotoLoc(matchingBrace)
+				} else {
+					h.Cursor.GotoLoc(matchingBrace.Move(1, h.Buf))
+				}
 			} else {
-				h.Cursor.GotoLoc(matchingBrace.Move(1, h.Buf))
+				return false
 			}
 		}
 	}
@@ -1195,6 +1241,21 @@ func (h *BufPane) HalfPageDown() bool {
 	return true
 }
 
+// ToggleDiffGutter turns the diff gutter off and on
+func (h *BufPane) ToggleDiffGutter() bool {
+	if !h.Buf.Settings["diffgutter"].(bool) {
+		h.Buf.Settings["diffgutter"] = true
+		h.Buf.UpdateDiff(func(synchronous bool) {
+			screen.Redraw()
+		})
+		InfoBar.Message("Enabled diff gutter")
+	} else {
+		h.Buf.Settings["diffgutter"] = false
+		InfoBar.Message("Disabled diff gutter")
+	}
+	return true
+}
+
 // ToggleRuler turns line numbers off and on
 func (h *BufPane) ToggleRuler() bool {
 	if !h.Buf.Settings["ruler"].(bool) {
@@ -1280,15 +1341,17 @@ func (h *BufPane) Quit() bool {
 	if h.Buf.Modified() {
 		if config.GlobalSettings["autosave"].(float64) > 0 {
 			// autosave on means we automatically save when quitting
-			h.Save()
-			quit()
+			h.SaveCB("Quit", func() {
+				quit()
+			})
 		} else {
 			InfoBar.YNPrompt("Save changes to "+h.Buf.GetName()+" before closing? (y,n,esc)", func(yes, canceled bool) {
 				if !canceled && !yes {
 					quit()
 				} else if !canceled && yes {
-					h.Save()
-					quit()
+					h.SaveCB("Quit", func() {
+						quit()
+					})
 				}
 			})
 		}
@@ -1505,7 +1568,7 @@ func (h *BufPane) SpawnMultiCursorUp() bool {
 	return true
 }
 
-// SpawnMultiCursorUp creates additional cursor, at the same X (if possible), one Y more.
+// SpawnMultiCursorDown creates additional cursor, at the same X (if possible), one Y more.
 func (h *BufPane) SpawnMultiCursorDown() bool {
 	if h.Cursor.Y+1 == h.Buf.LinesNum() {
 		return false

internal/action/bindings.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"io/ioutil"
 	"os"
+	"path/filepath"
 	"strings"
 	"unicode"
 
@@ -14,13 +15,22 @@ import (
 	"github.com/zyedidia/tcell"
 )
 
+func createBindingsIfNotExist(fname string) {
+	if _, e := os.Stat(fname); os.IsNotExist(e) {
+		ioutil.WriteFile(fname, []byte("{}"), 0644)
+	}
+}
+
+// InitBindings intializes the bindings map by reading from bindings.json
 func InitBindings() {
 	config.Bindings = DefaultBindings()
 
 	var parsed map[string]string
 	defaults := DefaultBindings()
 
-	filename := config.ConfigDir + "/bindings.json"
+	filename := filepath.Join(config.ConfigDir, "bindings.json")
+	createBindingsIfNotExist(filename)
+
 	if _, e := os.Stat(filename); e == nil {
 		input, err := ioutil.ReadFile(filename)
 		if err != nil {
@@ -158,7 +168,8 @@ func TryBindKey(k, v string, overwrite bool) (bool, error) {
 	var e error
 	var parsed map[string]string
 
-	filename := config.ConfigDir + "/bindings.json"
+	filename := filepath.Join(config.ConfigDir, "bindings.json")
+	createBindingsIfNotExist(filename)
 	if _, e = os.Stat(filename); e == nil {
 		input, err := ioutil.ReadFile(filename)
 		if err != nil {
@@ -207,7 +218,8 @@ func UnbindKey(k string) error {
 	var e error
 	var parsed map[string]string
 
-	filename := config.ConfigDir + "/bindings.json"
+	filename := filepath.Join(config.ConfigDir, "bindings.json")
+	createBindingsIfNotExist(filename)
 	if _, e = os.Stat(filename); e == nil {
 		input, err := ioutil.ReadFile(filename)
 		if err != nil {

internal/action/bufpane.go

@@ -113,6 +113,9 @@ func BufMapKey(k Event, action string) {
 		success := true
 		for i, a := range actionfns {
 			for j, c := range cursors {
+				if c == nil {
+					continue
+				}
 				h.Buf.SetCurCursor(c.Num)
 				h.Cursor = c
 				if i == 0 || (success && types[i-1] == '&') || (!success && types[i-1] == '|') || (types[i-1] == ',') {
@@ -267,13 +270,20 @@ func (h *BufPane) SetID(i uint64) {
 }
 
 func (h *BufPane) Name() string {
-	return h.Buf.GetName()
+	n := h.Buf.GetName()
+	if h.Buf.Modified() {
+		n += " +"
+	}
+	return n
 }
 
 // HandleEvent executes the tcell event properly
 func (h *BufPane) HandleEvent(event tcell.Event) {
-	if h.Buf.ExternallyModified() {
-		InfoBar.YNPrompt("The file on disk has changed. Reload file? (y,n)", func(yes, canceled bool) {
+	if h.Buf.ExternallyModified() && !h.Buf.ReloadDisabled {
+		InfoBar.YNPrompt("The file on disk has changed. Reload file? (y,n,esc)", func(yes, canceled bool) {
+			if canceled {
+				h.Buf.DisableReload()
+			}
 			if !yes || canceled {
 				h.Buf.UpdateModTime()
 			} else {
@@ -452,6 +462,7 @@ func (h *BufPane) DoRuneInsert(r rune) {
 		if recording_macro {
 			curmacro = append(curmacro, r)
 		}
+		h.Relocate()
 		h.PluginCBRune("onRune", r)
 	}
 }
@@ -556,6 +567,7 @@ var BufKeyActions = map[string]BufKeyAction{
 	"Autocomplete":           (*BufPane).Autocomplete,
 	"CycleAutocompleteBack":  (*BufPane).CycleAutocompleteBack,
 	"OutdentLine":            (*BufPane).OutdentLine,
+	"IndentLine":             (*BufPane).IndentLine,
 	"Paste":                  (*BufPane).Paste,
 	"PastePrimary":           (*BufPane).PastePrimary,
 	"SelectAll":              (*BufPane).SelectAll,
@@ -573,6 +585,7 @@ var BufKeyActions = map[string]BufKeyAction{
 	"EndOfLine":              (*BufPane).EndOfLine,
 	"ToggleHelp":             (*BufPane).ToggleHelp,
 	"ToggleKeyMenu":          (*BufPane).ToggleKeyMenu,
+	"ToggleDiffGutter":       (*BufPane).ToggleDiffGutter,
 	"ToggleRuler":            (*BufPane).ToggleRuler,
 	"ClearStatus":            (*BufPane).ClearStatus,
 	"ShellMode":              (*BufPane).ShellMode,
@@ -660,6 +673,7 @@ var MultiActions = map[string]bool{
 	"IndentSelection":     true,
 	"OutdentSelection":    true,
 	"OutdentLine":         true,
+	"IndentLine":          true,
 	"Paste":               true,
 	"PastePrimary":        true,
 	"SelectPageUp":        true,

internal/action/command.go

@@ -106,7 +106,7 @@ func (h *BufPane) PluginCmd(args []string) {
 	}
 
 	if h.Buf.Type != buffer.BTLog {
-		OpenLogBuf(h)
+		h.OpenLogBuf()
 	}
 
 	config.PluginCommand(buffer.LogBuf, args[0], args[1:])
@@ -272,7 +272,7 @@ func (h *BufPane) OpenCmd(args []string) {
 // ToggleLogCmd toggles the log view
 func (h *BufPane) ToggleLogCmd(args []string) {
 	if h.Buf.Type != buffer.BTLog {
-		OpenLogBuf(h)
+		h.OpenLogBuf()
 	} else {
 		h.Quit()
 	}
@@ -475,7 +475,7 @@ func SetGlobalOptionNative(option string, nativeValue interface{}) error {
 		b.SetOptionNative(option, nativeValue)
 	}
 
-	return config.WriteSettings(config.ConfigDir + "/settings.json")
+	return config.WriteSettings(filepath.Join(config.ConfigDir, "settings.json"))
 }
 
 func SetGlobalOption(option, value string) error {
@@ -732,23 +732,22 @@ func (h *BufPane) ReplaceCmd(args []string) {
 
 	nreplaced := 0
 	start := h.Buf.Start()
-	// end := h.Buf.End()
-	// if h.Cursor.HasSelection() {
-	// 	start = h.Cursor.CurSelection[0]
-	// 	end = h.Cursor.CurSelection[1]
-	// }
+	end := h.Buf.End()
+	if h.Cursor.HasSelection() {
+		start = h.Cursor.CurSelection[0]
+		end = h.Cursor.CurSelection[1]
+	}
 	if all {
-		nreplaced = h.Buf.ReplaceRegex(start, h.Buf.End(), regex, replace)
+		nreplaced, _ = h.Buf.ReplaceRegex(start, end, regex, replace)
 	} else {
 		inRange := func(l buffer.Loc) bool {
-			return l.GreaterEqual(start) && l.LessEqual(h.Buf.End())
+			return l.GreaterEqual(start) && l.LessEqual(end)
 		}
 
 		searchLoc := start
-		searching := true
 		var doReplacement func()
 		doReplacement = func() {
-			locs, found, err := h.Buf.FindNext(search, start, h.Buf.End(), searchLoc, true, !noRegex)
+			locs, found, err := h.Buf.FindNext(search, start, end, searchLoc, true, !noRegex)
 			if err != nil {
 				InfoBar.Error(err)
 				return
@@ -764,10 +763,11 @@ func (h *BufPane) ReplaceCmd(args []string) {
 
 			InfoBar.YNPrompt("Perform replacement (y,n,esc)", func(yes, canceled bool) {
 				if !canceled && yes {
-					h.Buf.Replace(locs[0], locs[1], replaceStr)
+					_, nrunes := h.Buf.ReplaceRegex(locs[0], locs[1], regex, replace)
 
 					searchLoc = locs[0]
-					searchLoc.X += utf8.RuneCount(replace)
+					searchLoc.X += nrunes + locs[0].Diff(locs[1], h.Buf)
+					end.Move(nrunes, h.Buf)
 					h.Cursor.Loc = searchLoc
 					nreplaced++
 				} else if !canceled && !yes {
@@ -778,9 +778,7 @@ func (h *BufPane) ReplaceCmd(args []string) {
 					h.Buf.RelocateCursors()
 					return
 				}
-				if searching {
-					doReplacement()
-				}
+				doReplacement()
 			})
 		}
 		doReplacement()
@@ -807,6 +805,11 @@ func (h *BufPane) ReplaceAllCmd(args []string) {
 func (h *BufPane) TermCmd(args []string) {
 	ps := h.tab.Panes
 
+	if !TermEmuSupported {
+		InfoBar.Error("Terminal emulator not supported on this system")
+		return
+	}
+
 	if len(args) == 0 {
 		sh := os.Getenv("SHELL")
 		if sh == "" {
@@ -830,7 +833,12 @@ func (h *BufPane) TermCmd(args []string) {
 		}
 
 		v := h.GetView()
-		MainTab().Panes[i] = NewTermPane(v.X, v.Y, v.Width, v.Height, t, id, MainTab())
+		tp, err := NewTermPane(v.X, v.Y, v.Width, v.Height, t, id, MainTab())
+		if err != nil {
+			InfoBar.Error(err)
+			return
+		}
+		MainTab().Panes[i] = tp
 		MainTab().SetActive(i)
 	}
 

internal/action/globals.go

@@ -5,15 +5,18 @@ import "github.com/zyedidia/micro/internal/buffer"
 var InfoBar *InfoPane
 var LogBufPane *BufPane
 
+// InitGlobals initializes the log buffer and the info bar
 func InitGlobals() {
 	InfoBar = NewInfoBar()
 	buffer.LogBuf = buffer.NewBufferFromString("", "Log", buffer.BTLog)
 }
 
+// GetInfoBar returns the infobar pane
 func GetInfoBar() *InfoPane {
 	return InfoBar
 }
 
+// WriteLog writes a string to the log buffer
 func WriteLog(s string) {
 	buffer.WriteLog(s)
 	if LogBufPane != nil {
@@ -28,7 +31,10 @@ func WriteLog(s string) {
 	}
 }
 
-func OpenLogBuf(h *BufPane) {
+// OpenLogBuf opens the log buffer from the current bufpane
+// If the current bufpane is a log buffer nothing happens,
+// otherwise the log buffer is opened in a horizontal split
+func (h *BufPane) OpenLogBuf() {
 	LogBufPane = h.HSplitBuf(buffer.LogBuf)
 	LogBufPane.CursorEnd()
 

internal/action/infopane.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"strings"
 
+	"github.com/zyedidia/micro/internal/buffer"
 	"github.com/zyedidia/micro/internal/display"
 	"github.com/zyedidia/micro/internal/info"
 	"github.com/zyedidia/micro/internal/util"
@@ -68,7 +69,7 @@ func (h *InfoPane) HandleEvent(event tcell.Event) {
 				h.EventCallback(resp)
 			}
 		}
-	case *tcell.EventMouse:
+	default:
 		h.BufPane.HandleEvent(event)
 	}
 }
@@ -123,6 +124,7 @@ var InfoNones = []string{
 	"HalfPageDown",
 	"ToggleHelp",
 	"ToggleKeyMenu",
+	"ToggleDiffGutter",
 	"ToggleRuler",
 	"JumpLine",
 	"ClearStatus",
@@ -185,14 +187,17 @@ func (h *InfoPane) Autocomplete() {
 	args := bytes.Split(l, []byte{' '})
 	cmd := string(args[0])
 
-	if len(args) == 1 {
-		b.Autocomplete(CommandComplete)
-	} else {
-		if action, ok := commands[cmd]; ok {
+	if h.PromptType == "Command" {
+		if len(args) == 1 {
+			b.Autocomplete(CommandComplete)
+		} else if action, ok := commands[cmd]; ok {
 			if action.completer != nil {
 				b.Autocomplete(action.completer)
 			}
 		}
+	} else {
+		// by default use filename autocompletion
+		b.Autocomplete(buffer.FileComplete)
 	}
 }
 

internal/action/tab.go

@@ -104,6 +104,13 @@ func (t *TabList) HandleEvent(event tcell.Event) {
 		mx, my := e.Position()
 		switch e.Buttons() {
 		case tcell.Button1:
+			if my == t.Y && mx == 0 {
+				t.Scroll(-4)
+				return
+			} else if my == t.Y && mx == t.Width-1 {
+				t.Scroll(4)
+				return
+			}
 			if len(t.List) > 1 {
 				ind := t.LocFromVisual(buffer.Loc{mx, my})
 				if ind != -1 {

internal/action/terminal_supported.go

@@ -30,7 +30,12 @@ func RunTermEmulator(h *BufPane, input string, wait bool, getOutput bool, callba
 	id := MainTab().Panes[0].ID()
 
 	v := h.GetView()
-	MainTab().Panes[0] = NewTermPane(v.X, v.Y, v.Width, v.Height, t, id, MainTab())
+
+	tp, err := NewTermPane(v.X, v.Y, v.Width, v.Height, t, id, MainTab())
+	if err != nil {
+		return err
+	}
+	MainTab().Panes[0] = tp
 	MainTab().SetActive(0)
 
 	return nil

internal/action/termpane.go

@@ -1,6 +1,7 @@
 package action
 
 import (
+	"errors"
 	"runtime"
 
 	"github.com/zyedidia/clipboard"
@@ -20,14 +21,18 @@ type TermPane struct {
 	tab           *Tab
 }
 
-func NewTermPane(x, y, w, h int, t *shell.Terminal, id uint64, tab *Tab) *TermPane {
+func NewTermPane(x, y, w, h int, t *shell.Terminal, id uint64, tab *Tab) (*TermPane, error) {
+	if !TermEmuSupported {
+		return nil, errors.New("Terminal emulator is not supported on this system")
+	}
+
 	th := new(TermPane)
 	th.Terminal = t
 	th.id = id
 	th.mouseReleased = true
 	th.Window = display.NewTermWindow(x, y, w, h, t)
 	th.tab = tab
-	return th
+	return th, nil
 }
 
 func (t *TermPane) ID() uint64 {

internal/buffer/backup.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"path/filepath"
 	"time"
 
 	"github.com/zyedidia/micro/internal/config"
@@ -42,12 +43,12 @@ func (b *Buffer) Backup(checkTime bool) error {
 
 	b.lastbackup = time.Now()
 
-	backupdir := config.ConfigDir + "/backups/"
+	backupdir := filepath.Join(config.ConfigDir, "backups")
 	if _, err := os.Stat(backupdir); os.IsNotExist(err) {
 		os.Mkdir(backupdir, os.ModePerm)
 	}
 
-	name := backupdir + util.EscapePath(b.AbsPath)
+	name := filepath.Join(backupdir, util.EscapePath(b.AbsPath))
 
 	err := overwriteFile(name, encoding.Nop, func(file io.Writer) (e error) {
 		if len(b.lines) == 0 {
@@ -81,7 +82,7 @@ func (b *Buffer) RemoveBackup() {
 	if !b.Settings["backup"].(bool) || b.Path == "" || b.Type != BTDefault {
 		return
 	}
-	f := config.ConfigDir + "/backups/" + util.EscapePath(b.AbsPath)
+	f := filepath.Join(config.ConfigDir, "backups", util.EscapePath(b.AbsPath))
 	os.Remove(f)
 }
 
@@ -89,7 +90,7 @@ func (b *Buffer) RemoveBackup() {
 // Returns true if a backup was applied
 func (b *Buffer) ApplyBackup(fsize int64) bool {
 	if b.Settings["backup"].(bool) && len(b.Path) > 0 && b.Type == BTDefault {
-		backupfile := config.ConfigDir + "/backups/" + util.EscapePath(b.AbsPath)
+		backupfile := filepath.Join(config.ConfigDir, "backups", util.EscapePath(b.AbsPath))
 		if info, err := os.Stat(backupfile); err == nil {
 			backup, err := os.Open(backupfile)
 			if err == nil {

internal/buffer/buffer.go

@@ -1,13 +1,14 @@
 package buffer
 
 import (
+	"bufio"
 	"bytes"
 	"crypto/md5"
 	"errors"
 	"io"
 	"io/ioutil"
-	"log"
 	"os"
+	"path"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -17,6 +18,7 @@ import (
 
 	luar "layeh.com/gopher-luar"
 
+	dmp "github.com/sergi/go-diff/diffmatchpatch"
 	"github.com/zyedidia/micro/internal/config"
 	ulua "github.com/zyedidia/micro/internal/lua"
 	"github.com/zyedidia/micro/internal/screen"
@@ -73,13 +75,51 @@ type SharedBuffer struct {
 	// Type of the buffer (e.g. help, raw, scratch etc..)
 	Type BufType
 
+	// Path to the file on disk
+	Path string
+	// Absolute path to the file on disk
+	AbsPath string
+	// Name of the buffer on the status line
+	name string
+
+	// Settings customized by the user
+	Settings map[string]interface{}
+
+	Suggestions   []string
+	Completions   []string
+	CurSuggestion int
+
+	Messages []*Message
+
+	updateDiffTimer   *time.Timer
+	diffBase          []byte
+	diffBaseLineCount int
+	diffLock          sync.RWMutex
+	diff              map[int]DiffStatus
+
+	// counts the number of edits
+	// resets every backupTime edits
+	lastbackup time.Time
+
+	// ReloadDisabled allows the user to disable reloads if they
+	// are viewing a file that is constantly changing
+	ReloadDisabled bool
+
 	isModified bool
 	// Whether or not suggestions can be autocompleted must be shared because
 	// it changes based on how the buffer has changed
 	HasSuggestions bool
 
-	// Modifications is the list of modified regions for syntax highlighting
-	Modifications []Loc
+	// The Highlighter struct actually performs the highlighting
+	Highlighter *highlight.Highlighter
+	// SyntaxDef represents the syntax highlighting definition being used
+	// This stores the highlighting rules and filetype detection info
+	SyntaxDef *highlight.Def
+
+	ModifiedThisFrame bool
+
+	// Hash of the original buffer -- empty if fastdirty is on
+	origHash [md5.Size]byte
 }
 
 func (b *SharedBuffer) insert(pos Loc, value []byte) {
@@ -87,17 +127,49 @@ func (b *SharedBuffer) insert(pos Loc, value []byte) {
 	b.HasSuggestions = false
 	b.LineArray.insert(pos, value)
 
-	// b.Modifications is cleared every screen redraw so it's
-	// ok to append duplicates
-	b.Modifications = append(b.Modifications, Loc{pos.Y, pos.Y + bytes.Count(value, []byte{'\n'})})
+	inslines := bytes.Count(value, []byte{'\n'})
+	b.MarkModified(pos.Y, pos.Y+inslines)
 }
 func (b *SharedBuffer) remove(start, end Loc) []byte {
 	b.isModified = true
 	b.HasSuggestions = false
-	b.Modifications = append(b.Modifications, Loc{start.Y, start.Y})
+	defer b.MarkModified(start.Y, end.Y)
 	return b.LineArray.remove(start, end)
 }
 
+// MarkModified marks the buffer as modified for this frame
+// and performs rehighlighting if syntax highlighting is enabled
+func (b *SharedBuffer) MarkModified(start, end int) {
+	b.ModifiedThisFrame = true
+
+	if !b.Settings["syntax"].(bool) || b.SyntaxDef == nil {
+		return
+	}
+
+	start = util.Clamp(start, 0, len(b.lines))
+	end = util.Clamp(end, 0, len(b.lines))
+
+	l := -1
+	for i := start; i <= end; i++ {
+		l = util.Max(b.Highlighter.ReHighlightStates(b, i), l)
+	}
+	b.Highlighter.HighlightMatches(b, start, l+1)
+}
+
+// DisableReload disables future reloads of this sharedbuffer
+func (b *SharedBuffer) DisableReload() {
+	b.ReloadDisabled = true
+}
+
+const (
+	DSUnchanged    = 0
+	DSAdded        = 1
+	DSModified     = 2
+	DSDeletedAbove = 3
+)
+
+type DiffStatus byte
+
 // Buffer stores the main information about a currently open file including
 // the actual text (in a LineArray), the undo/redo stack (in an EventHandler)
 // all the cursors, the syntax highlighting info, the settings for the buffer
@@ -112,36 +184,6 @@ type Buffer struct {
 	cursors     []*Cursor
 	curCursor   int
 	StartCursor Loc
-
-	// Path to the file on disk
-	Path string
-	// Absolute path to the file on disk
-	AbsPath string
-	// Name of the buffer on the status line
-	name string
-
-	// SyntaxDef represents the syntax highlighting definition being used
-	// This stores the highlighting rules and filetype detection info
-	SyntaxDef *highlight.Def
-	// The Highlighter struct actually performs the highlighting
-	Highlighter   *highlight.Highlighter
-	HighlightLock sync.Mutex
-
-	// Hash of the original buffer -- empty if fastdirty is on
-	origHash [md5.Size]byte
-
-	// Settings customized by the user
-	Settings map[string]interface{}
-
-	Suggestions   []string
-	Completions   []string
-	CurSuggestion int
-
-	Messages []*Message
-
-	// counts the number of edits
-	// resets every backupTime edits
-	lastbackup time.Time
 }
 
 // NewBufferFromFile opens a new buffer using the given path
@@ -196,22 +238,6 @@ func NewBuffer(r io.Reader, size int64, path string, startcursor Loc, btype BufT
 
 	b := new(Buffer)
 
-	b.Settings = config.DefaultCommonSettings()
-	for k, v := range config.GlobalSettings {
-		if _, ok := b.Settings[k]; ok {
-			b.Settings[k] = v
-		}
-	}
-	config.InitLocalSettings(b.Settings, path)
-
-	enc, err := htmlindex.Get(b.Settings["encoding"].(string))
-	if err != nil {
-		enc = unicode.UTF8
-		b.Settings["encoding"] = "utf-8"
-	}
-
-	reader := transform.NewReader(r, enc.NewDecoder())
-
 	found := false
 	if len(path) > 0 {
 		for _, buf := range OpenBuffers {
@@ -223,28 +249,44 @@ func NewBuffer(r io.Reader, size int64, path string, startcursor Loc, btype BufT
 		}
 	}
 
-	b.Path = path
-	b.AbsPath = absPath
-
 	if !found {
 		b.SharedBuffer = new(SharedBuffer)
 		b.Type = btype
 
+		b.AbsPath = absPath
+		b.Path = path
+
+		b.Settings = config.DefaultCommonSettings()
+		for k, v := range config.GlobalSettings {
+			if _, ok := config.DefaultGlobalOnlySettings[k]; !ok {
+				// make sure setting is not global-only
+				b.Settings[k] = v
+			}
+		}
+		config.InitLocalSettings(b.Settings, path)
+
+		enc, err := htmlindex.Get(b.Settings["encoding"].(string))
+		if err != nil {
+			enc = unicode.UTF8
+			b.Settings["encoding"] = "utf-8"
+		}
+
 		hasBackup := b.ApplyBackup(size)
 
 		if !hasBackup {
+			reader := bufio.NewReader(transform.NewReader(r, enc.NewDecoder()))
 			b.LineArray = NewLineArray(uint64(size), FFAuto, reader)
 		}
 		b.EventHandler = NewEventHandler(b.SharedBuffer, b.cursors)
+
+		// The last time this file was modified
+		b.UpdateModTime()
 	}
 
 	if b.Settings["readonly"].(bool) && b.Type == BTDefault {
 		b.Type.Readonly = true
 	}
 
-	// The last time this file was modified
-	b.UpdateModTime()
-
 	switch b.Endings {
 	case FFUnix:
 		b.Settings["fileformat"] = "unix"
@@ -253,10 +295,11 @@ func NewBuffer(r io.Reader, size int64, path string, startcursor Loc, btype BufT
 	}
 
 	b.UpdateRules()
+	// init local settings again now that we know the filetype
 	config.InitLocalSettings(b.Settings, b.Path)
 
-	if _, err := os.Stat(config.ConfigDir + "/buffers/"); os.IsNotExist(err) {
-		os.Mkdir(config.ConfigDir+"/buffers/", os.ModePerm)
+	if _, err := os.Stat(filepath.Join(config.ConfigDir, "buffers")); os.IsNotExist(err) {
+		os.Mkdir(filepath.Join(config.ConfigDir, "buffers"), os.ModePerm)
 	}
 
 	if startcursor.X != -1 && startcursor.Y != -1 {
@@ -273,7 +316,7 @@ func NewBuffer(r io.Reader, size int64, path string, startcursor Loc, btype BufT
 	b.AddCursor(NewCursor(b, b.StartCursor))
 	b.GetActiveCursor().Relocate()
 
-	if !b.Settings["fastdirty"].(bool) {
+	if !b.Settings["fastdirty"].(bool) && !found {
 		if size > LargeFileThreshold {
 			// If the file is larger than LargeFileThreshold fastdirty needs to be on
 			b.Settings["fastdirty"] = true
@@ -282,13 +325,11 @@ func NewBuffer(r io.Reader, size int64, path string, startcursor Loc, btype BufT
 		}
 	}
 
-	err = config.RunPluginFn("onBufferOpen", luar.New(ulua.L, b))
+	err := config.RunPluginFn("onBufferOpen", luar.New(ulua.L, b))
 	if err != nil {
 		screen.TermMessage(err)
 	}
 
-	b.Modifications = make([]Loc, 0, 10)
-
 	OpenBuffers = append(OpenBuffers, b)
 
 	return b
@@ -319,13 +360,17 @@ func (b *Buffer) Fini() {
 // GetName returns the name that should be displayed in the statusline
 // for this buffer
 func (b *Buffer) GetName() string {
-	if b.name == "" {
+	name := b.name
+	if name == "" {
 		if b.Path == "" {
 			return "No name"
 		}
-		return b.Path
+		name = b.Path
 	}
-	return b.name
+	if b.Settings["basename"].(bool) {
+		return path.Base(name)
+	}
+	return name
 }
 
 //SetName changes the name for this buffer
@@ -355,16 +400,6 @@ func (b *Buffer) Remove(start, end Loc) {
 	}
 }
 
-// ClearModifications clears the list of modified lines in this buffer
-// The list of modified lines is used for syntax highlighting so that
-// we can selectively highlight only the necessary lines
-// This function should be called every time this buffer is drawn to
-// the screen
-func (b *Buffer) ClearModifications() {
-	// clear slice without resetting the cap
-	b.Modifications = b.Modifications[:0]
-}
-
 // FileType returns the buffer's filetype
 func (b *Buffer) FileType() string {
 	return b.Settings["filetype"].(string)
@@ -398,7 +433,7 @@ func (b *Buffer) ReOpen() error {
 		return err
 	}
 
-	reader := transform.NewReader(file, enc.NewDecoder())
+	reader := bufio.NewReader(transform.NewReader(file, enc.NewDecoder()))
 	data, err := ioutil.ReadAll(reader)
 	txt := string(data)
 
@@ -408,6 +443,9 @@ func (b *Buffer) ReOpen() error {
 	b.EventHandler.ApplyDiff(txt)
 
 	err = b.UpdateModTime()
+	if !b.Settings["fastdirty"].(bool) {
+		calcHash(b, &b.origHash)
+	}
 	b.isModified = false
 	b.RelocateCursors()
 	return err
@@ -528,7 +566,6 @@ func (b *Buffer) UpdateRules() {
 	if syntaxFile == "" {
 		// search for the syntax file in the user's custom syntax files
 		for _, f := range config.ListRealRuntimeFiles(config.RTSyntax) {
-			log.Println("real runtime file", f.Name())
 			data, err := f.Data()
 			if err != nil {
 				screen.TermMessage("Error loading syntax file " + f.Name() + ": " + err.Error())
@@ -627,7 +664,7 @@ func (b *Buffer) UpdateRules() {
 			go func() {
 				b.Highlighter.HighlightStates(b)
 				b.Highlighter.HighlightMatches(b, 0, b.End().Y)
-				screen.DrawChan <- true
+				screen.Redraw()
 			}()
 		}
 	}
@@ -804,7 +841,7 @@ var BracePairs = [][2]rune{
 // returns the location of the matching brace
 // if the boolean returned is true then the original matching brace is one character left
 // of the starting location
-func (b *Buffer) FindMatchingBrace(braceType [2]rune, start Loc) (Loc, bool) {
+func (b *Buffer) FindMatchingBrace(braceType [2]rune, start Loc) (Loc, bool, bool) {
 	curLine := []rune(string(b.LineBytes(start.Y)))
 	startChar := ' '
 	if start.X >= 0 && start.X < len(curLine) {
@@ -834,9 +871,9 @@ func (b *Buffer) FindMatchingBrace(braceType [2]rune, start Loc) (Loc, bool) {
 					i--
 					if i == 0 {
 						if startChar == braceType[0] {
-							return Loc{x, y}, false
+							return Loc{x, y}, false, true
 						}
-						return Loc{x, y}, true
+						return Loc{x, y}, true, true
 					}
 				}
 			}
@@ -858,9 +895,9 @@ func (b *Buffer) FindMatchingBrace(braceType [2]rune, start Loc) (Loc, bool) {
 					i--
 					if i == 0 {
 						if leftChar == braceType[1] {
-							return Loc{x, y}, true
+							return Loc{x, y}, true, true
 						}
-						return Loc{x, y}, false
+						return Loc{x, y}, false, true
 					}
 				} else if r == braceType[1] {
 					i++
@@ -868,7 +905,7 @@ func (b *Buffer) FindMatchingBrace(braceType [2]rune, start Loc) (Loc, bool) {
 			}
 		}
 	}
-	return start, true
+	return start, true, false
 }
 
 // Retab changes all tabs to spaces or vice versa
@@ -891,6 +928,7 @@ func (b *Buffer) Retab() {
 
 		l = bytes.TrimLeft(l, " \t")
 		b.lines[i].data = append(ws, l...)
+		b.MarkModified(i, i)
 		dirty = true
 	}
 
@@ -932,6 +970,101 @@ func (b *Buffer) Write(bytes []byte) (n int, err error) {
 	return len(bytes), nil
 }
 
+func (b *Buffer) updateDiffSync() {
+	b.diffLock.Lock()
+	defer b.diffLock.Unlock()
+
+	b.diff = make(map[int]DiffStatus)
+
+	if b.diffBase == nil {
+		return
+	}
+
+	differ := dmp.New()
+	baseRunes, bufferRunes, _ := differ.DiffLinesToRunes(string(b.diffBase), string(b.Bytes()))
+	diffs := differ.DiffMainRunes(baseRunes, bufferRunes, false)
+	lineN := 0
+
+	for _, diff := range diffs {
+		lineCount := len([]rune(diff.Text))
+
+		switch diff.Type {
+		case dmp.DiffEqual:
+			lineN += lineCount
+		case dmp.DiffInsert:
+			var status DiffStatus
+			if b.diff[lineN] == DSDeletedAbove {
+				status = DSModified
+			} else {
+				status = DSAdded
+			}
+			for i := 0; i < lineCount; i++ {
+				b.diff[lineN] = status
+				lineN++
+			}
+		case dmp.DiffDelete:
+			b.diff[lineN] = DSDeletedAbove
+		}
+	}
+}
+
+// UpdateDiff computes the diff between the diff base and the buffer content.
+// The update may be performed synchronously or asynchronously.
+// UpdateDiff calls the supplied callback when the update is complete.
+// The argument passed to the callback is set to true if and only if
+// the update was performed synchronously.
+// If an asynchronous update is already pending when UpdateDiff is called,
+// UpdateDiff does not schedule another update, in which case the callback
+// is not called.
+func (b *Buffer) UpdateDiff(callback func(bool)) {
+	if b.updateDiffTimer != nil {
+		return
+	}
+
+	lineCount := b.LinesNum()
+	if b.diffBaseLineCount > lineCount {
+		lineCount = b.diffBaseLineCount
+	}
+
+	if lineCount < 1000 {
+		b.updateDiffSync()
+		callback(true)
+	} else if lineCount < 30000 {
+		b.updateDiffTimer = time.AfterFunc(500*time.Millisecond, func() {
+			b.updateDiffTimer = nil
+			b.updateDiffSync()
+			callback(false)
+		})
+	} else {
+		// Don't compute diffs for very large files
+		b.diffLock.Lock()
+		b.diff = make(map[int]DiffStatus)
+		b.diffLock.Unlock()
+		callback(true)
+	}
+}
+
+// SetDiffBase sets the text that is used as the base for diffing the buffer content
+func (b *Buffer) SetDiffBase(diffBase []byte) {
+	b.diffBase = diffBase
+	if diffBase == nil {
+		b.diffBaseLineCount = 0
+	} else {
+		b.diffBaseLineCount = strings.Count(string(diffBase), "\n")
+	}
+	b.UpdateDiff(func(synchronous bool) {
+		screen.Redraw()
+	})
+}
+
+// DiffStatus returns the diff status for a line in the buffer
+func (b *Buffer) DiffStatus(lineN int) DiffStatus {
+	b.diffLock.RLock()
+	defer b.diffLock.RUnlock()
+	// Note that the zero value for DiffStatus is equal to DSUnchanged
+	return b.diff[lineN]
+}
+
 // WriteLog writes a string to the log buffer
 func WriteLog(s string) {
 	LogBuf.EventHandler.Insert(LogBuf.End(), s)

internal/buffer/buffer_test.go

@@ -0,0 +1,111 @@
+package buffer
+
+import (
+	"strings"
+	"testing"
+
+	testifyAssert "github.com/stretchr/testify/assert"
+	lua "github.com/yuin/gopher-lua"
+
+	ulua "github.com/zyedidia/micro/internal/lua"
+)
+
+type operation struct {
+	start Loc
+	end   Loc
+	text  []string
+}
+
+type asserter interface {
+	Equal(interface{}, interface{}, ...interface{}) bool
+	NotEqual(interface{}, interface{}, ...interface{}) bool
+}
+
+type noOpAsserter struct {
+}
+
+func (a *noOpAsserter) Equal(interface{}, interface{}, ...interface{}) bool {
+	return true
+}
+
+func (a *noOpAsserter) NotEqual(interface{}, interface{}, ...interface{}) bool {
+	return true
+}
+
+func init() {
+	ulua.L = lua.NewState()
+}
+
+func check(t *testing.T, before []string, operations []operation, after []string) {
+	var assert asserter
+	if t == nil {
+		// Benchmark mode; don't perform assertions
+		assert = &noOpAsserter{}
+	} else {
+		assert = testifyAssert.New(t)
+	}
+
+	b := NewBufferFromString(strings.Join(before, "\n"), "", BTDefault)
+
+	assert.NotEqual("", b.GetName())
+	assert.Equal(false, b.ExternallyModified())
+	assert.Equal(false, b.Modified())
+	assert.Equal(1, b.NumCursors())
+
+	checkText := func(lines []string) {
+		assert.Equal([]byte(strings.Join(lines, "\n")), b.Bytes())
+		assert.Equal(len(lines), b.LinesNum())
+		for i, s := range lines {
+			assert.Equal(s, b.Line(i))
+			assert.Equal([]byte(s), b.LineBytes(i))
+		}
+	}
+
+	checkText(before)
+
+	var cursors []*Cursor
+
+	for _, op := range operations {
+		cursor := NewCursor(b, op.start)
+		cursor.SetSelectionStart(op.start)
+		cursor.SetSelectionEnd(op.end)
+		b.AddCursor(cursor)
+		cursors = append(cursors, cursor)
+	}
+
+	assert.Equal(1+len(operations), b.NumCursors())
+
+	for i, op := range operations {
+		cursor := cursors[i]
+		b.SetCurCursor(cursor.Num)
+		cursor.DeleteSelection()
+		cursor.ResetSelection()
+		b.Insert(cursor.Loc, strings.Join(op.text, "\n"))
+	}
+
+	checkText(after)
+
+	for b.UndoStack.Peek() != nil {
+		b.UndoOneEvent()
+	}
+
+	checkText(before)
+
+	for i, op := range operations {
+		cursor := cursors[i]
+		if !cursor.HasSelection() {
+			assert.Equal(op.start, cursor.Loc)
+		} else {
+			assert.Equal(op.start, cursor.CurSelection[0])
+			assert.Equal(op.end, cursor.CurSelection[1])
+		}
+	}
+
+	for b.RedoStack.Peek() != nil {
+		b.RedoOneEvent()
+	}
+
+	checkText(after)
+
+	b.Close()
+}

internal/buffer/eventhandler.go

@@ -2,7 +2,6 @@ package buffer
 
 import (
 	"bytes"
-	"log"
 	"time"
 	"unicode/utf8"
 
@@ -42,6 +41,73 @@ type Delta struct {
 	End   Loc
 }
 
+// DoTextEvent runs a text event
+func (eh *EventHandler) DoTextEvent(t *TextEvent, useUndo bool) {
+	oldl := eh.buf.LinesNum()
+
+	if useUndo {
+		eh.Execute(t)
+	} else {
+		ExecuteTextEvent(t, eh.buf)
+	}
+
+	if len(t.Deltas) != 1 {
+		return
+	}
+
+	text := t.Deltas[0].Text
+	start := t.Deltas[0].Start
+	lastnl := -1
+	var endX int
+	var textX int
+	if t.EventType == TextEventInsert {
+		linecount := eh.buf.LinesNum() - oldl
+		textcount := utf8.RuneCount(text)
+		lastnl = bytes.LastIndex(text, []byte{'\n'})
+		if lastnl >= 0 {
+			endX = utf8.RuneCount(text[lastnl+1:])
+			textX = endX
+		} else {
+			endX = start.X + textcount
+			textX = textcount
+		}
+		t.Deltas[0].End = clamp(Loc{endX, start.Y + linecount}, eh.buf.LineArray)
+	}
+	end := t.Deltas[0].End
+
+	for _, c := range eh.cursors {
+		move := func(loc Loc) Loc {
+			if t.EventType == TextEventInsert {
+				if start.Y != loc.Y && loc.GreaterThan(start) {
+					loc.Y += end.Y - start.Y
+				} else if loc.Y == start.Y && loc.GreaterEqual(start) {
+					loc.Y += end.Y - start.Y
+					if lastnl >= 0 {
+						loc.X += textX - start.X
+					} else {
+						loc.X += textX
+					}
+				}
+				return loc
+			} else {
+				if loc.Y != end.Y && loc.GreaterThan(end) {
+					loc.Y -= end.Y - start.Y
+				} else if loc.Y == end.Y && loc.GreaterEqual(end) {
+					loc = loc.MoveLA(-DiffLA(start, end, eh.buf.LineArray), eh.buf.LineArray)
+				}
+				return loc
+			}
+		}
+		c.Loc = move(c.Loc)
+		c.CurSelection[0] = move(c.CurSelection[0])
+		c.CurSelection[1] = move(c.CurSelection[1])
+		c.OrigSelection[0] = move(c.OrigSelection[0])
+		c.OrigSelection[1] = move(c.OrigSelection[1])
+		c.Relocate()
+		c.LastVisualX = c.GetVisualX()
+	}
+}
+
 // ExecuteTextEvent runs a text event
 func ExecuteTextEvent(t *TextEvent, buf *SharedBuffer) {
 	if t.EventType == TextEventInsert {
@@ -66,9 +132,9 @@ func ExecuteTextEvent(t *TextEvent, buf *SharedBuffer) {
 }
 
 // UndoTextEvent undoes a text event
-func UndoTextEvent(t *TextEvent, buf *SharedBuffer) {
+func (eh *EventHandler) UndoTextEvent(t *TextEvent) {
 	t.EventType = -t.EventType
-	ExecuteTextEvent(t, buf)
+	eh.DoTextEvent(t, false)
 }
 
 // EventHandler executes text manipulations and allows undoing and redoing
@@ -118,78 +184,33 @@ func (eh *EventHandler) Insert(start Loc, textStr string) {
 
 // InsertBytes creates an insert text event and executes it
 func (eh *EventHandler) InsertBytes(start Loc, text []byte) {
+	if len(text) == 0 {
+		return
+	}
+	start = clamp(start, eh.buf.LineArray)
 	e := &TextEvent{
 		C:         *eh.cursors[eh.active],
 		EventType: TextEventInsert,
 		Deltas:    []Delta{{text, start, Loc{0, 0}}},
 		Time:      time.Now(),
 	}
-	// oldl := eh.buf.LinesNum()
-	eh.Execute(e)
-	// linecount := eh.buf.LinesNum() - oldl
-	textcount := utf8.RuneCount(text)
-	lastnl := bytes.LastIndex(text, []byte{'\n'})
-	var endX int
-	var textX int
-	if lastnl >= 0 {
-		endX = utf8.RuneCount(text[lastnl:])
-		textX = endX
-	} else {
-		// endX = start.X + textcount
-		textX = textcount
-	}
-
-	e.Deltas[0].End = start.MoveLA(textcount, eh.buf.LineArray)
-	// e.Deltas[0].End = clamp(Loc{endX, start.Y + linecount}, eh.buf.LineArray)
-	end := e.Deltas[0].End
-
-	for _, c := range eh.cursors {
-		move := func(loc Loc) Loc {
-			log.Println("move", loc)
-			if start.Y != end.Y && loc.GreaterThan(start) {
-				loc.Y += end.Y - start.Y
-			} else if loc.Y == start.Y && loc.GreaterEqual(start) {
-				loc.Y += end.Y - start.Y
-				loc.X += textX
-			}
-			return loc
-		}
-		c.Loc = move(c.Loc)
-		c.Relocate()
-		c.CurSelection[0] = move(c.CurSelection[0])
-		c.CurSelection[1] = move(c.CurSelection[1])
-		c.OrigSelection[0] = move(c.OrigSelection[0])
-		c.OrigSelection[1] = move(c.OrigSelection[1])
-		c.LastVisualX = c.GetVisualX()
-	}
+	eh.DoTextEvent(e, true)
 }
 
 // Remove creates a remove text event and executes it
 func (eh *EventHandler) Remove(start, end Loc) {
+	if start == end {
+		return
+	}
+	start = clamp(start, eh.buf.LineArray)
+	end = clamp(end, eh.buf.LineArray)
 	e := &TextEvent{
 		C:         *eh.cursors[eh.active],
 		EventType: TextEventRemove,
 		Deltas:    []Delta{{[]byte{}, start, end}},
 		Time:      time.Now(),
 	}
-	eh.Execute(e)
-
-	for _, c := range eh.cursors {
-		move := func(loc Loc) Loc {
-			if start.Y != end.Y && loc.GreaterThan(end) {
-				loc.Y -= end.Y - start.Y
-			} else if loc.Y == end.Y && loc.GreaterEqual(end) {
-				loc = loc.MoveLA(-DiffLA(start, end, eh.buf.LineArray), eh.buf.LineArray)
-			}
-			return loc
-		}
-		c.Loc = move(c.Loc)
-		c.CurSelection[0] = move(c.CurSelection[0])
-		c.CurSelection[1] = move(c.CurSelection[1])
-		c.OrigSelection[0] = move(c.OrigSelection[0])
-		c.OrigSelection[1] = move(c.OrigSelection[1])
-		c.LastVisualX = c.GetVisualX()
-	}
+	eh.DoTextEvent(e, true)
 }
 
 // MultipleReplace creates an multiple insertions executes them
@@ -260,10 +281,9 @@ func (eh *EventHandler) UndoOneEvent() {
 	if t == nil {
 		return
 	}
-
 	// Undo it
 	// Modifies the text event
-	UndoTextEvent(t, eh.buf)
+	eh.UndoTextEvent(t)
 
 	// Set the cursor in the right place
 	teCursor := t.C
@@ -309,9 +329,6 @@ func (eh *EventHandler) RedoOneEvent() {
 		return
 	}
 
-	// Modifies the text event
-	UndoTextEvent(t, eh.buf)
-
 	teCursor := t.C
 	if teCursor.Num >= 0 && teCursor.Num < len(eh.cursors) {
 		t.C = *eh.cursors[teCursor.Num]
@@ -320,5 +337,8 @@ func (eh *EventHandler) RedoOneEvent() {
 		teCursor.Num = -1
 	}
 
+	// Modifies the text event
+	eh.UndoTextEvent(t)
+
 	eh.UndoStack.Push(t)
 }

internal/buffer/line_array.go

@@ -230,9 +230,7 @@ func (la *LineArray) remove(start, end Loc) []byte {
 	if start.Y == end.Y {
 		la.lines[start.Y].data = append(la.lines[start.Y].data[:startX], la.lines[start.Y].data[endX:]...)
 	} else {
-		for i := start.Y + 1; i <= end.Y-1; i++ {
-			la.deleteLine(start.Y + 1)
-		}
+		la.deleteLines(start.Y+1, end.Y-1)
 		la.deleteToEnd(Loc{startX, start.Y})
 		la.deleteFromStart(Loc{endX - 1, start.Y + 1})
 		la.joinLines(start.Y, start.Y+1)
@@ -255,6 +253,10 @@ func (la *LineArray) deleteLine(y int) {
 	la.lines = la.lines[:y+copy(la.lines[y:], la.lines[y+1:])]
 }
 
+func (la *LineArray) deleteLines(y1, y2 int) {
+	la.lines = la.lines[:y1+copy(la.lines[y1:], la.lines[y2+1:])]
+}
+
 // DeleteByte deletes the byte at a position
 func (la *LineArray) deleteByte(pos Loc) {
 	la.lines[pos.Y].data = la.lines[pos.Y].data[:pos.X+copy(la.lines[pos.Y].data[pos.X:], la.lines[pos.Y].data[pos.X+1:])]

internal/buffer/loc.go

@@ -102,7 +102,7 @@ func (l Loc) left(buf *LineArray) Loc {
 	return res
 }
 
-// Move moves the cursor n characters to the left or right
+// MoveLA moves the cursor n characters to the left or right
 // It moves the cursor left if n is negative
 func (l Loc) MoveLA(n int, buf *LineArray) Loc {
 	if n > 0 {
@@ -117,9 +117,12 @@ func (l Loc) MoveLA(n int, buf *LineArray) Loc {
 	return l
 }
 
-func (l Loc) Diff(a, b Loc, buf *Buffer) int {
-	return DiffLA(a, b, buf.LineArray)
+// Diff returns the difference between two locs
+func (l Loc) Diff(b Loc, buf *Buffer) int {
+	return DiffLA(l, b, buf.LineArray)
 }
+
+// Move moves a loc n characters
 func (l Loc) Move(n int, buf *Buffer) Loc {
 	return l.MoveLA(n, buf.LineArray)
 }
@@ -139,7 +142,7 @@ func ByteOffset(pos Loc, buf *Buffer) int {
 // clamps a loc within a buffer
 func clamp(pos Loc, la *LineArray) Loc {
 	if pos.GreaterEqual(la.End()) {
-		return la.End().MoveLA(-1, la)
+		return la.End()
 	} else if pos.LessThan(la.Start()) {
 		return la.Start()
 	}

internal/buffer/save.go

@@ -1,6 +1,7 @@
 package buffer
 
 import (
+	"bufio"
 	"bytes"
 	"errors"
 	"io"
@@ -55,8 +56,9 @@ func overwriteFile(name string, enc encoding.Encoding, fn func(io.Writer) error,
 		return
 	}
 
-	w := transform.NewWriter(writeCloser, enc.NewEncoder())
+	w := bufio.NewWriter(transform.NewWriter(writeCloser, enc.NewEncoder()))
 	err = fn(w)
+	w.Flush()
 
 	if e := writeCloser.Close(); e != nil && err == nil {
 		err = e
@@ -109,8 +111,8 @@ func (b *Buffer) saveToFile(filename string, withSudo bool) error {
 
 	if b.Settings["eofnewline"].(bool) {
 		end := b.End()
-		if b.RuneAt(Loc{end.X - 1, end.Y}) != '\n' {
-			b.Insert(end, "\n")
+		if b.RuneAt(Loc{end.X, end.Y}) != '\n' {
+			b.insert(end, []byte{'\n'})
 		}
 	}
 

internal/buffer/search.go

@@ -120,24 +120,27 @@ func (b *Buffer) FindNext(s string, start, end, from Loc, down bool, useRegex bo
 	if down {
 		l, found = b.findDown(r, from, end)
 		if !found {
-			l, found = b.findDown(r, start, from)
+			l, found = b.findDown(r, start, end)
 		}
 	} else {
 		l, found = b.findUp(r, from, start)
 		if !found {
-			l, found = b.findUp(r, end, from)
+			l, found = b.findUp(r, end, start)
 		}
 	}
 	return l, found, nil
 }
 
 // ReplaceRegex replaces all occurrences of 'search' with 'replace' in the given area
-// and returns the number of replacements made
-func (b *Buffer) ReplaceRegex(start, end Loc, search *regexp.Regexp, replace []byte) int {
+// and returns the number of replacements made and the number of runes
+// added or removed
+func (b *Buffer) ReplaceRegex(start, end Loc, search *regexp.Regexp, replace []byte) (int, int) {
 	if start.GreaterThan(end) {
 		start, end = end, start
 	}
 
+	netrunes := 0
+
 	found := 0
 	var deltas []Delta
 	for i := start.Y; i <= end.Y; i++ {
@@ -155,8 +158,13 @@ func (b *Buffer) ReplaceRegex(start, end Loc, search *regexp.Regexp, replace []b
 			l = util.SliceStart(l, end.X)
 		}
 		newText := search.ReplaceAllFunc(l, func(in []byte) []byte {
+			result := []byte{}
+			for _, submatches := range search.FindAllSubmatchIndex(in, -1) {
+				result = search.Expand(result, replace, in, submatches)
+			}
 			found++
-			return replace
+			netrunes += utf8.RuneCount(in) - utf8.RuneCount(result)
+			return result
 		})
 
 		from := Loc{charpos, i}
@@ -166,5 +174,5 @@ func (b *Buffer) ReplaceRegex(start, end Loc, search *regexp.Regexp, replace []b
 	}
 	b.MultipleReplace(deltas)
 
-	return found
+	return found, netrunes
 }

internal/buffer/serialize.go

@@ -31,7 +31,7 @@ func (b *Buffer) Serialize() error {
 		return nil
 	}
 
-	name := config.ConfigDir + "/buffers/" + util.EscapePath(b.AbsPath)
+	name := filepath.Join(config.ConfigDir, "buffers", util.EscapePath(b.AbsPath))
 
 	return overwriteFile(name, encoding.Nop, func(file io.Writer) error {
 		err := gob.NewEncoder(file).Encode(SerializedBuffer{

internal/config/config.go

@@ -3,6 +3,7 @@ package config
 import (
 	"errors"
 	"os"
+	"path/filepath"
 
 	homedir "github.com/mitchellh/go-homedir"
 )
@@ -24,10 +25,10 @@ func InitConfigDir(flagConfigDir string) error {
 			if err != nil {
 				return errors.New("Error finding your home directory\nCan't load config files: " + err.Error())
 			}
-			xdgHome = home + "/.config"
+			xdgHome = filepath.Join(home, ".config")
 		}
 
-		microHome = xdgHome + "/micro"
+		microHome = filepath.Join(xdgHome, "micro")
 	}
 	ConfigDir = microHome
 

internal/config/rtfiles.go

@@ -199,7 +199,6 @@ func InitRuntimeFiles() {
 					}
 					p.Info, err = NewPluginInfo(data)
 					if err != nil {
-						log.Println(err)
 						continue
 					}
 					p.Name = p.Info.Name
@@ -232,7 +231,6 @@ func InitRuntimeFiles() {
 						}
 						p.Info, err = NewPluginInfo(data)
 						if err != nil {
-							log.Println(err)
 							continue
 						}
 						p.Name = p.Info.Name

internal/config/settings.go

@@ -147,7 +147,7 @@ func RegisterCommonOptionPlug(pl string, name string, defaultvalue interface{})
 	if v, ok := GlobalSettings[name]; !ok {
 		defaultCommonSettings[name] = defaultvalue
 		GlobalSettings[name] = defaultvalue
-		err := WriteSettings(filepath.Join(ConfigDir, "/settings.json"))
+		err := WriteSettings(filepath.Join(ConfigDir, "settings.json"))
 		if err != nil {
 			return errors.New("Error writing settings.json file: " + err.Error())
 		}
@@ -165,14 +165,14 @@ func RegisterGlobalOptionPlug(pl string, name string, defaultvalue interface{})
 // RegisterGlobalOption creates a new global-only option
 func RegisterGlobalOption(name string, defaultvalue interface{}) error {
 	if v, ok := GlobalSettings[name]; !ok {
-		defaultGlobalSettings[name] = defaultvalue
+		DefaultGlobalOnlySettings[name] = defaultvalue
 		GlobalSettings[name] = defaultvalue
 		err := WriteSettings(filepath.Join(ConfigDir, "settings.json"))
 		if err != nil {
 			return errors.New("Error writing settings.json file: " + err.Error())
 		}
 	} else {
-		defaultGlobalSettings[name] = v
+		DefaultGlobalOnlySettings[name] = v
 	}
 	return nil
 }
@@ -184,13 +184,15 @@ func GetGlobalOption(name string) interface{} {
 
 var defaultCommonSettings = map[string]interface{}{
 	"autoindent":     true,
+	"autosu":         false,
 	"backup":         true,
 	"basename":       false,
 	"colorcolumn":    float64(0),
 	"cursorline":     true,
+	"diffgutter":     false,
 	"encoding":       "utf-8",
-	"eofnewline":     false,
-	"fastdirty":      true,
+	"eofnewline":     true,
+	"fastdirty":      false,
 	"fileformat":     "unix",
 	"filetype":       "unknown",
 	"ignorecase":     false,
@@ -243,7 +245,7 @@ func DefaultCommonSettings() map[string]interface{} {
 
 // a list of settings that should only be globally modified and their
 // default values
-var defaultGlobalSettings = map[string]interface{}{
+var DefaultGlobalOnlySettings = map[string]interface{}{
 	"autosave":       float64(0),
 	"colorscheme":    "default",
 	"infobar":        true,
@@ -254,6 +256,7 @@ var defaultGlobalSettings = map[string]interface{}{
 	"sucmd":          "sudo",
 	"pluginchannels": []string{"https://raw.githubusercontent.com/micro-editor/plugin-channel/master/channel.json"},
 	"pluginrepos":    []string{},
+	"xterm":          false,
 }
 
 // a list of settings that should never be globally modified
@@ -269,7 +272,7 @@ func DefaultGlobalSettings() map[string]interface{} {
 	for k, v := range defaultCommonSettings {
 		globalsettings[k] = v
 	}
-	for k, v := range defaultGlobalSettings {
+	for k, v := range DefaultGlobalOnlySettings {
 		globalsettings[k] = v
 	}
 	return globalsettings
@@ -282,7 +285,7 @@ func DefaultAllSettings() map[string]interface{} {
 	for k, v := range defaultCommonSettings {
 		allsettings[k] = v
 	}
-	for k, v := range defaultGlobalSettings {
+	for k, v := range DefaultGlobalOnlySettings {
 		allsettings[k] = v
 	}
 	return allsettings

internal/display/bufwindow.go

@@ -136,9 +136,6 @@ func (w *BufWindow) Relocate() bool {
 	if w.drawStatus {
 		h--
 	}
-	if b.LinesNum() <= h {
-		height = w.Height
-	}
 	ret := false
 	activeC := w.Buf.GetActiveCursor()
 	cy := activeC.Y
@@ -212,6 +209,9 @@ func (w *BufWindow) LocFromVisual(svloc buffer.Loc) buffer.Loc {
 		if hasMessage {
 			vloc.X += 2
 		}
+		if b.Settings["diffgutter"].(bool) {
+			vloc.X++
+		}
 		if b.Settings["ruler"].(bool) {
 			vloc.X += maxLineNumLength + 1
 		}
@@ -272,11 +272,7 @@ func (w *BufWindow) LocFromVisual(svloc buffer.Loc) buffer.Loc {
 					if vloc.Y >= bufHeight {
 						break
 					}
-					vloc.X = 0
-					// This will draw an empty line number because the current line is wrapped
-					if b.Settings["ruler"].(bool) {
-						vloc.X += maxLineNumLength + 1
-					}
+					vloc.X = w.gutterOffset
 				}
 			}
 		}
@@ -311,6 +307,34 @@ func (w *BufWindow) drawGutter(vloc *buffer.Loc, bloc *buffer.Loc) {
 	vloc.X++
 }
 
+func (w *BufWindow) drawDiffGutter(backgroundStyle tcell.Style, softwrapped bool, vloc *buffer.Loc, bloc *buffer.Loc) {
+	symbol := ' '
+	styleName := ""
+
+	switch w.Buf.DiffStatus(bloc.Y) {
+	case buffer.DSAdded:
+		symbol = '\u258C' // Left half block
+		styleName = "diff-added"
+	case buffer.DSModified:
+		symbol = '\u258C' // Left half block
+		styleName = "diff-modified"
+	case buffer.DSDeletedAbove:
+		if !softwrapped {
+			symbol = '\u2594' // Upper one eighth block
+			styleName = "diff-deleted"
+		}
+	}
+
+	style := backgroundStyle
+	if s, ok := config.Colorscheme[styleName]; ok {
+		foreground, _, _ := s.Decompose()
+		style = style.Foreground(foreground)
+	}
+
+	screen.SetContent(w.X+vloc.X, w.Y+vloc.Y, symbol, nil, style)
+	vloc.X++
+}
+
 func (w *BufWindow) drawLineNum(lineNumStyle tcell.Style, softwrapped bool, maxLineNumLength int, vloc *buffer.Loc, bloc *buffer.Loc) {
 	lineNum := strconv.Itoa(bloc.Y + 1)
 
@@ -373,15 +397,22 @@ func (w *BufWindow) displayBuffer() {
 		bufWidth--
 	}
 
-	if b.Settings["syntax"].(bool) && b.SyntaxDef != nil {
-		for _, r := range b.Modifications {
-			final := -1
-			for i := r.X; i <= r.Y; i++ {
-				final = util.Max(b.Highlighter.ReHighlightStates(b, i), final)
-			}
-			b.Highlighter.HighlightMatches(b, r.X, final+1)
+	if b.ModifiedThisFrame {
+		if b.Settings["diffgutter"].(bool) {
+			b.UpdateDiff(func(synchronous bool) {
+				// If the diff was updated asynchronously, the outer call to
+				// displayBuffer might already be completed and we need to
+				// schedule a redraw in order to display the new diff.
+				// Note that this cannot lead to an infinite recursion
+				// because the modifications were cleared above so there won't
+				// be another call to UpdateDiff when displayBuffer is called
+				// during the redraw.
+				if !synchronous {
+					screen.Redraw()
+				}
+			})
 		}
-		b.ClearModifications()
+		b.ModifiedThisFrame = false
 	}
 
 	var matchingBraces []buffer.Loc
@@ -398,12 +429,14 @@ func (w *BufWindow) displayBuffer() {
 				r := c.RuneUnder(curX)
 				rl := c.RuneUnder(curX - 1)
 				if r == bp[0] || r == bp[1] || rl == bp[0] || rl == bp[1] {
-					mb, left := b.FindMatchingBrace(bp, curLoc)
-					matchingBraces = append(matchingBraces, mb)
-					if !left {
-						matchingBraces = append(matchingBraces, curLoc)
-					} else {
-						matchingBraces = append(matchingBraces, curLoc.Move(-1, b))
+					mb, left, found := b.FindMatchingBrace(bp, curLoc)
+					if found {
+						matchingBraces = append(matchingBraces, mb)
+						if !left {
+							matchingBraces = append(matchingBraces, curLoc)
+						} else {
+							matchingBraces = append(matchingBraces, curLoc.Move(-1, b))
+						}
 					}
 				}
 			}
@@ -444,18 +477,28 @@ func (w *BufWindow) displayBuffer() {
 	for vloc.Y = 0; vloc.Y < bufHeight; vloc.Y++ {
 		vloc.X = 0
 
+		currentLine := false
+		for _, c := range cursors {
+			if bloc.Y == c.Y && w.active {
+				currentLine = true
+				break
+			}
+		}
+
+		s := lineNumStyle
+		if currentLine {
+			s = curNumStyle
+		}
+
 		if hasMessage {
 			w.drawGutter(&vloc, &bloc)
 		}
 
+		if b.Settings["diffgutter"].(bool) {
+			w.drawDiffGutter(s, false, &vloc, &bloc)
+		}
+
 		if b.Settings["ruler"].(bool) {
-			s := lineNumStyle
-			for _, c := range cursors {
-				if bloc.Y == c.Y && w.active {
-					s = curNumStyle
-					break
-				}
-			}
 			w.drawLineNum(s, false, maxLineNumLength, &vloc, &bloc)
 		}
 
@@ -579,6 +622,13 @@ func (w *BufWindow) displayBuffer() {
 						break
 					}
 					vloc.X = 0
+					if hasMessage {
+						w.drawGutter(&vloc, &bloc)
+					}
+					if b.Settings["diffgutter"].(bool) {
+						w.drawDiffGutter(lineNumStyle, true, &vloc, &bloc)
+					}
+
 					// This will draw an empty line number because the current line is wrapped
 					if b.Settings["ruler"].(bool) {
 						w.drawLineNum(lineNumStyle, true, maxLineNumLength, &vloc, &bloc)

internal/display/infowindow.go

@@ -122,10 +122,8 @@ func (i *InfoWindow) displayBuffer() {
 
 	totalwidth := blocX - nColsBeforeStart
 	for len(line) > 0 {
-		if activeC.X == blocX {
-			screen.ShowCursor(vlocX, i.Y)
-		}
-
+		curVX := vlocX
+		curBX := blocX
 		r, size := utf8.DecodeRune(line)
 
 		draw(r, i.defStyle())
@@ -151,6 +149,9 @@ func (i *InfoWindow) displayBuffer() {
 				draw(char, i.defStyle())
 			}
 		}
+		if activeC.X == curBX {
+			screen.ShowCursor(curVX, i.Y)
+		}
 		totalwidth += width
 		if vlocX >= i.Width {
 			break
@@ -208,6 +209,7 @@ func (i *InfoWindow) scrollToSuggestion() {
 }
 
 func (i *InfoWindow) Display() {
+	i.Clear()
 	x := 0
 	if config.GetGlobalOption("keymenu").(bool) {
 		i.displayKeyMenu()

internal/display/statusline.go

@@ -3,7 +3,6 @@ package display
 import (
 	"bytes"
 	"fmt"
-	"path"
 	"regexp"
 	"strconv"
 	"strings"
@@ -32,9 +31,6 @@ type StatusLine struct {
 
 var statusInfo = map[string]func(*buffer.Buffer) string{
 	"filename": func(b *buffer.Buffer) string {
-		if b.Settings["basename"].(bool) {
-			return path.Base(b.GetName())
-		}
 		return b.GetName()
 	},
 	"line": func(b *buffer.Buffer) string {

internal/display/tabwindow.go

@@ -14,19 +14,19 @@ type TabWindow struct {
 	Names   []string
 	active  int
 	Y       int
-	width   int
+	Width   int
 	hscroll int
 }
 
 func NewTabWindow(w int, y int) *TabWindow {
 	tw := new(TabWindow)
-	tw.width = w
+	tw.Width = w
 	tw.Y = y
 	return tw
 }
 
 func (w *TabWindow) Resize(width, height int) {
-	w.width = width
+	w.Width = width
 }
 
 func (w *TabWindow) LocFromVisual(vloc buffer.Loc) int {
@@ -40,7 +40,7 @@ func (w *TabWindow) LocFromVisual(vloc buffer.Loc) int {
 		}
 		x += s
 		x += 3
-		if x >= w.width {
+		if x >= w.Width {
 			break
 		}
 	}
@@ -50,9 +50,9 @@ func (w *TabWindow) LocFromVisual(vloc buffer.Loc) int {
 func (w *TabWindow) Scroll(amt int) {
 	w.hscroll += amt
 	s := w.TotalSize()
-	w.hscroll = util.Clamp(w.hscroll, 0, s-w.width)
+	w.hscroll = util.Clamp(w.hscroll, 0, s-w.Width)
 
-	if s-w.width <= 0 {
+	if s-w.Width <= 0 {
 		w.hscroll = 0
 	}
 }
@@ -77,17 +77,17 @@ func (w *TabWindow) SetActive(a int) {
 	for i, n := range w.Names {
 		c := utf8.RuneCountInString(n)
 		if i == a {
-			if x+c >= w.hscroll+w.width {
-				w.hscroll = util.Clamp(x+c+1-w.width, 0, s-w.width)
+			if x+c >= w.hscroll+w.Width {
+				w.hscroll = util.Clamp(x+c+1-w.Width, 0, s-w.Width)
 			} else if x < w.hscroll {
-				w.hscroll = util.Clamp(x-4, 0, s-w.width)
+				w.hscroll = util.Clamp(x-4, 0, s-w.Width)
 			}
 			break
 		}
 		x += c + 4
 	}
 
-	if s-w.width <= 0 {
+	if s-w.Width <= 0 {
 		w.hscroll = 0
 	}
 }
@@ -96,6 +96,11 @@ func (w *TabWindow) Display() {
 	x := -w.hscroll
 	done := false
 
+	tabBarStyle := config.DefStyle.Reverse(true)
+	if style, ok := config.Colorscheme["tabbar"]; ok {
+		tabBarStyle = style
+	}
+
 	draw := func(r rune, n int) {
 		for i := 0; i < n; i++ {
 			rw := runewidth.RuneWidth(r)
@@ -104,14 +109,14 @@ func (w *TabWindow) Display() {
 				if j > 0 {
 					c = ' '
 				}
-				if x == w.width-1 && !done {
-					screen.SetContent(w.width-1, w.Y, '>', nil, config.DefStyle.Reverse(true))
+				if x == w.Width-1 && !done {
+					screen.SetContent(w.Width-1, w.Y, '>', nil, tabBarStyle)
 					x++
 					break
 				} else if x == 0 && w.hscroll > 0 {
-					screen.SetContent(0, w.Y, '<', nil, config.DefStyle.Reverse(true))
-				} else if x >= 0 && x < w.width {
-					screen.SetContent(x, w.Y, c, nil, config.DefStyle.Reverse(true))
+					screen.SetContent(0, w.Y, '<', nil, tabBarStyle)
+				} else if x >= 0 && x < w.Width {
+					screen.SetContent(x, w.Y, c, nil, tabBarStyle)
 				}
 				x++
 			}
@@ -136,12 +141,12 @@ func (w *TabWindow) Display() {
 		} else {
 			draw(' ', 3)
 		}
-		if x >= w.width {
+		if x >= w.Width {
 			break
 		}
 	}
 
-	if x < w.width {
-		draw(' ', w.width-x)
+	if x < w.Width {
+		draw(' ', w.Width-x)
 	}
 }

internal/info/history.go

@@ -3,6 +3,7 @@ package info
 import (
 	"encoding/gob"
 	"os"
+	"path/filepath"
 
 	"github.com/zyedidia/micro/internal/config"
 )
@@ -12,7 +13,7 @@ import (
 // The savehistory option must be on
 func (i *InfoBuf) LoadHistory() {
 	if config.GetGlobalOption("savehistory").(bool) {
-		file, err := os.Open(config.ConfigDir + "/buffers/history")
+		file, err := os.Open(filepath.Join(config.ConfigDir, "buffers", "history"))
 		defer file.Close()
 		var decodedMap map[string][]string
 		if err == nil {
@@ -46,7 +47,7 @@ func (i *InfoBuf) SaveHistory() {
 			}
 		}
 
-		file, err := os.Create(config.ConfigDir + "/buffers/history")
+		file, err := os.Create(filepath.Join(config.ConfigDir, "buffers", "history"))
 		defer file.Close()
 		if err == nil {
 			encoder := gob.NewEncoder(file)

internal/screen/screen.go

@@ -21,9 +21,9 @@ var Screen tcell.Screen
 // The lock is necessary since the screen is polled on a separate thread
 var lock sync.Mutex
 
-// DrawChan is a channel that will cause the screen to redraw when
+// drawChan is a channel that will cause the screen to redraw when
 // written to even if no event user event has occurred
-var DrawChan chan bool
+var drawChan chan bool
 
 // Lock locks the screen lock
 func Lock() {
@@ -37,7 +37,16 @@ func Unlock() {
 
 // Redraw schedules a redraw with the draw channel
 func Redraw() {
-	DrawChan <- true
+	select {
+	case drawChan <- true:
+	default:
+		// channel is full
+	}
+}
+
+// DrawChan returns the draw channel
+func DrawChan() chan bool {
+	return drawChan
 }
 
 type screenCell struct {
@@ -118,7 +127,7 @@ func TempStart(screenWasNil bool) {
 
 // Init creates and initializes the tcell screen
 func Init() {
-	DrawChan = make(chan bool, 8)
+	drawChan = make(chan bool)
 
 	// Should we enable true color?
 	truecolor := os.Getenv("MICRO_TRUECOLOR") == "1"
@@ -127,6 +136,12 @@ func Init() {
 		os.Setenv("TCELL_TRUECOLOR", "disable")
 	}
 
+	var oldTerm string
+	if config.GetGlobalOption("xterm").(bool) {
+		oldTerm = os.Getenv("TERM")
+		os.Setenv("TERM", "xterm-256color")
+	}
+
 	// Initilize tcell
 	var err error
 	Screen, err = tcell.NewScreen()
@@ -140,6 +155,11 @@ func Init() {
 		os.Exit(1)
 	}
 
+	// restore TERM
+	if config.GetGlobalOption("xterm").(bool) {
+		os.Setenv("TERM", oldTerm)
+	}
+
 	if config.GetGlobalOption("mouse").(bool) {
 		Screen.EnableMouse()
 	}

internal/util/util.go

@@ -30,7 +30,7 @@ var (
 	// CompileDate is the date this binary was compiled on
 	CompileDate = "Unknown"
 	// Debug logging
-	Debug = "ON"
+	Debug = "OFF"
 	// FakeCursor is used to disable the terminal cursor and have micro
 	// draw its own (enabled for windows consoles where the cursor is slow)
 	FakeCursor = false

runtime/colorschemes/atom-dark.micro

@@ -16,6 +16,9 @@ color-link tabbar "#1D1F21,#C5C8C6"
 color-link indent-char "#505050,#1D1F21"
 color-link line-number "#656866,#232526"
 color-link current-line-number "#656866,#1D1F21"
+color-link diff-added "#00AF00"
+color-link diff-modified "#FFAF00"
+color-link diff-deleted "#D70000"
 color-link gutter-error "#FF4444,#1D1F21"
 color-link gutter-warning "#EEEE77,#1D1F21"
 color-link cursor-line "#2D2F31"

runtime/colorschemes/bubblegum.micro

@@ -14,6 +14,9 @@ color-link underlined "underline 241,231"
 color-link todo "246,231"
 color-link statusline "241,254"
 color-link tabbar "241,254"
+color-link diff-added "34"
+color-link diff-modified "214"
+color-link diff-deleted "160"
 color-link gutter-error "197,231"
 color-link gutter-warning "134,231"
 color-link line-number "246,254"

runtime/colorschemes/cmc-16.micro

@@ -33,6 +33,9 @@ color-link statusline "white,blue"
 color-link tabbar "white,blue"
 color-link current-line-number "red"
 color-link current-line-number.scroller "red"
+color-link diff-added "green"
+color-link diff-modified "yellow"
+color-link diff-deleted "red"
 color-link gutter-error ",red"
 color-link gutter-warning "red"
 color-link color-column "cyan"

runtime/colorschemes/cmc-tc.micro

@@ -28,9 +28,12 @@ color-link statusline "#aaaaaa,#8a496b"
 color-link tabbar "#aaaaaa,#8a496b"
 color-link current-line-number "bold #e34234,#424549"
 color-link current-line-number.scroller "red"
+color-link diff-added "#00AF00"
+color-link diff-modified "#FFAF00"
+color-link diff-deleted "#D70000"
 color-link gutter-error ",#e34234"
 color-link gutter-warning "#e34234"
 color-link color-column "#f26522"
 color-link constant.bool "bold #55ffff"
 color-link constant.bool.true "bold #85ff85"
-color-link constant.bool.false "bold #ff8585"
+color-link constant.bool.false "bold #ff8585"

runtime/colorschemes/darcula.micro

@@ -17,6 +17,9 @@ color-link tabbar "#242424,#CCCCCC"
 color-link indent-char "#4F4F4F,#242424"
 color-link line-number "#666666,#2C2C2C"
 color-link current-line-number "#666666,#242424"
+color-link diff-added "#00AF00"
+color-link diff-modified "#FFAF00"
+color-link diff-deleted "#D70000"
 color-link gutter-error "#CB4B16,#242424"
 color-link gutter-warning "#E6DB74,#242424"
 color-link cursor-line "#2C2C2C"

runtime/colorschemes/default.micro

@@ -17,6 +17,9 @@ color-link tabbar "#282828,#F8F8F2"
 color-link indent-char "#505050,#282828"
 color-link line-number "#AAAAAA,#323232"
 color-link current-line-number "#AAAAAA,#282828"
+color-link diff-added "#00AF00"
+color-link diff-modified "#FFAF00"
+color-link diff-deleted "#D70000"
 color-link gutter-error "#CB4B16,#282828"
 color-link gutter-warning "#E6DB74,#282828"
 color-link cursor-line "#323232"

runtime/colorschemes/geany.micro

@@ -18,5 +18,8 @@ color-link current-line-number ""
 color-link statusline "black,white"
 color-link tabbar "black,white"
 color-link color-column "bold geren"
+color-link diff-added "green"
+color-link diff-modified "yellow"
+color-link diff-deleted "red"
 color-link gutter-error ",red"
 color-link gutter-warning "red"

runtime/colorschemes/gotham.micro

@@ -15,6 +15,9 @@ color-link statusline "#091F2E,#599CAB"
 color-link indent-char "#505050,#0C1014"
 color-link line-number "#245361,#11151C"
 color-link current-line-number "#599CAB,#11151C"
+color-link diff-added "#00AF00"
+color-link diff-modified "#FFAF00"
+color-link diff-deleted "#D70000"
 color-link gutter-error "#C23127,#11151C"
 color-link gutter-warning "#EDB443,#11151C"
 color-link cursor-line "#091F2E"

runtime/colorschemes/gruvbox-tc.micro

@@ -11,6 +11,9 @@ color-link type "#fb4934,#282828"
 color-link special "#d79921,#282828"
 color-link underlined "underline #282828"
 color-link error "#9d0006,#282828"
+color-link diff-added "#00AF00"
+color-link diff-modified "#FFAF00"
+color-link diff-deleted "#D70000"
 color-link gutter-error "#fb4934,#282828"
 color-link gutter-warning "#d79921,#282828"
 color-link line-number "#665c54,#3c3836"

runtime/colorschemes/gruvbox.micro

@@ -11,6 +11,9 @@ color-link special "172,235"
 color-link underlined "underline 109,235"
 color-link error "235,124"
 color-link todo "bold 223,235"
+color-link diff-added "34"
+color-link diff-modified "214"
+color-link diff-deleted "160"
 color-link line-number "243,237"
 color-link current-line-number "172,235"
 color-link cursor-line "237"

runtime/colorschemes/material-tc.micro

@@ -7,6 +7,9 @@ color-link constant.string "#C3E88D,#263238"
 color-link current-line-number "#80DEEA,#263238"
 color-link cursor-line "#283942"
 color-link default "#EEFFFF,#263238"
+color-link diff-added "#00AF00"
+color-link diff-modified "#FFAF00"
+color-link diff-deleted "#D70000"
 color-link divider "#263238,#80DEEA"
 color-link error "bold #263238,#F07178"
 color-link gutter-error "#EEFFFF,#F07178"

runtime/colorschemes/monokai-dark.micro

@@ -15,6 +15,9 @@ color-link statusline "#282828,#F8F8F2"
 color-link indent-char "#505050,#282828"
 color-link line-number "#AAAAAA,#282828"
 color-link current-line-number "#AAAAAA,#1D0000"
+color-link diff-added "#00AF00"
+color-link diff-modified "#FFAF00"
+color-link diff-deleted "#D70000"
 color-link gutter-error "#CB4B16"
 color-link gutter-warning "#E6DB74"
 color-link cursor-line "#323232"

runtime/colorschemes/monokai.micro

@@ -17,6 +17,9 @@ color-link tabbar "#282828,#F8F8F2"
 color-link indent-char "#505050,#282828"
 color-link line-number "#AAAAAA,#323232"
 color-link current-line-number "#AAAAAA,#282828"
+color-link diff-added "#00AF00"
+color-link diff-modified "#FFAF00"
+color-link diff-deleted "#D70000"
 color-link gutter-error "#CB4B16,#282828"
 color-link gutter-warning "#E6DB74,#282828"
 color-link cursor-line "#323232"

runtime/colorschemes/one-dark.micro

@@ -8,8 +8,11 @@ color-link constant.string.char "#BDE6AD"
 color-link constant.specialChar "#DDF2A4"
 color-link current-line-number "#C6C6C6,#21252C"
 color-link cursor-line "#282C34"
-color-link divider "#1E1E1E"
+color-link divider "#ABB2BF"
 color-link error "#D2A8A1"
+color-link diff-added "#00AF00"
+color-link diff-modified "#FFAF00"
+color-link diff-deleted "#D70000"
 color-link gutter-error "#9B859D"
 color-link gutter-warning "#9B859D"
 color-link identifier "#61AFEF"

runtime/colorschemes/railscast.micro

@@ -13,6 +13,9 @@ color-link gutter-error "#cc7833,#11151C"
 color-link indent-char "#414141,#2b2b2b"
 color-link line-number "#a1a1a1,#353535"
 color-link current-line-number "#e6e1dc,#2b2b2b"
+color-link diff-added "#00AF00"
+color-link diff-modified "#FFAF00"
+color-link diff-deleted "#D70000"
 color-link gutter-warning "#a5c261,#11151C"
 color-link symbol "#edb753,#2b2b2b"
 color-link identifier "#edb753,#2b2b2b"

runtime/colorschemes/simple.micro

@@ -12,6 +12,9 @@ color-link todo ",brightyellow"
 color-link indent-char "black"
 color-link line-number "yellow"
 color-link current-line-number "red"
+color-link diff-added "green"
+color-link diff-modified "yellow"
+color-link diff-deleted "red"
 color-link gutter-error ",red"
 color-link gutter-warning "red"
 #Cursor line causes readability issues. Disabled for now.

runtime/colorschemes/solarized-tc.micro

@@ -16,6 +16,9 @@ color-link tabbar "#003541,#839496"
 color-link indent-char "#003541,#002833"
 color-link line-number "#586E75,#003541"
 color-link current-line-number "#586E75,#002833"
+color-link diff-added "#00AF00"
+color-link diff-modified "#FFAF00"
+color-link diff-deleted "#D70000"
 color-link gutter-error "#003541,#CB4B16"
 color-link gutter-warning "#CB4B16,#002833"
 color-link cursor-line "#003541"

runtime/colorschemes/solarized.micro

@@ -15,6 +15,9 @@ color-link tabbar "black,brightblue"
 color-link indent-char "black"
 color-link line-number "bold brightgreen,black"
 color-link current-line-number "bold brightgreen,default"
+color-link diff-added "green"
+color-link diff-modified "yellow"
+color-link diff-deleted "red"
 color-link gutter-error "black,brightred"
 color-link gutter-warning "brightred,default"
 color-link cursor-line "black"

runtime/colorschemes/sunny-day.micro

@@ -15,6 +15,9 @@ color-link statusline "233,229"
 color-link tabbar "233,229"
 color-link indent-char "229"
 color-link line-number "244"
+color-link diff-added "34"
+color-link diff-modified "214"
+color-link diff-deleted "160"
 color-link gutter-error "88"
 color-link gutter-warning "88"
 color-link cursor-line "229"

runtime/colorschemes/twilight.micro

@@ -10,6 +10,9 @@ color-link current-line-number "#868686,#1B1B1B"
 color-link cursor-line "#1B1B1B"
 color-link divider "#1E1E1E"
 color-link error "#D2A8A1"
+color-link diff-added "#00AF00"
+color-link diff-modified "#FFAF00"
+color-link diff-deleted "#D70000"
 color-link gutter-error "#9B859D"
 color-link gutter-warning "#9B859D"
 color-link identifier "#9B703F"

runtime/colorschemes/zenburn.micro

@@ -16,6 +16,9 @@ color-link statusline "186,236"
 color-link tabbar "186,236"
 color-link indent-char "238,237"
 color-link line-number "248,238"
+color-link diff-added "34"
+color-link diff-modified "214"
+color-link diff-deleted "160"
 color-link gutter-error "237,174"
 color-link gutter-warning "174,237"
 color-link cursor-line "238"

runtime/help/colors.md

@@ -20,6 +20,8 @@ set colorscheme twilight
 Micro comes with a number of colorschemes by default. The colorschemes that you
 can display will depend on what kind of color support your terminal has.
 
+Omit color-link default "[fg color],[bg color]" will make the background color match the terminal's, and transparency if set.
+
 Modern terminals tend to have a palette of 16 user-configurable colors (these
 colors can often be configured in the terminal preferences), and additional
 color support comes in three flavors.
@@ -93,6 +95,7 @@ variable `MICRO_TRUECOLOR` must be set to 1.
   look its best. Use cmc-16 if your terminal doesn't support true color.
 * `gruvbox-tc`: The true color version of the gruvbox colorscheme
 * `github-tc`: The true color version of the Github colorscheme
+* `material-tc`: Colorscheme based off of Google's Material Design palette
 
 ## Creating a Colorscheme
 

runtime/help/copypaste.md

@@ -89,8 +89,9 @@ selection, micro's mouse support must first be disabled by turning the
 `mouse` option off. The terminal, unlike micro, has no sense of different
 buffers/splits and what the different characters being displayed are. This
 means that for copying multiple lines using the terminal selection, you
-should first disable line numbers (turn off the `ruler` option), otherwise
-they might be part of your selection and copied.
+should first disable line numbers and diff indicators (turn off the `ruler`
+and `diffgutter` options), otherwise they might be part of your selection
+and copied.
 
 ## Recommendations
 
@@ -103,7 +104,7 @@ The recommended method of copying is the following:
 * If you are working over SSH, use the terminal keybinding
   (Ctrl-Shift-c or Command-c) to perform copies. You must first disable
   the `mouse` option to perform a terminal selection, and you may wish
-  to disable line numbers (`ruler` option) and close other splits. This
-  method will only be able to copy characters that are displayed on the
-  screen (you will not be able to copy more than one page's worth of
-  characters).
+  to disable line numbers and diff indicators (`ruler` and `diffgutter`
+  options) and close other splits. This method will only be able to copy
+  characters that are displayed on the screen (you will not be able to
+  copy more than one page's worth of characters).

runtime/help/keybindings.md

@@ -194,6 +194,8 @@ DuplicateLine
 DeleteLine
 IndentSelection
 OutdentSelection
+OutdentLine
+IndentLine
 Paste
 SelectAll
 OpenFile
@@ -210,6 +212,7 @@ EndOfLine
 ParagraphPrevious
 ParagraphNext
 ToggleHelp
+ToggleDiffGutter
 ToggleRuler
 JumpLine
 ClearStatus

runtime/help/options.md

@@ -16,6 +16,22 @@ Here are the available options:
 
 	default value: `true`
 
+* `autosave`: automatically save the buffer every n seconds, where n is the
+   value of the autosave option. Also when quitting on a modified buffer, micro
+   will automatically save and quit. Be warned, this option saves the buffer
+   without prompting the user, so data may be overwritten. If this option is
+   set to `0`, no autosaving is performed.
+
+    default value: `0`
+
+* `autosu`: When a file is saved that the user doesn't have permission to
+   modify, micro will ask if the user would like to use super user
+   privileges to save the file. If this option is enabled, micro will
+   automatically attempt to use super user privileges to save without
+   asking the user.
+
+    default value: `false`
+
 * `backup`: micro will automatically keep backups of all open buffers. Backups
    are stored in `~/.config/micro/backups` and are removed when the buffer is
    closed cleanly. In the case of a system crash or a micro crash, the contents
@@ -28,8 +44,8 @@ Here are the available options:
 
     default value: `true`
 
-* `basename`: in the infobar, show only the basename of the file being edited
-   rather than the full path.
+* `basename`: in the infobar and tabbar, show only the basename of the file
+   being edited rather than the full path.
 
     default value: `false`
 
@@ -60,14 +76,19 @@ Here are the available options:
 
 	default value: `true`
 
+* `diffgutter`: display diff indicators before lines.
+
+	default value: `false`
+
 * `encoding`: the encoding to open and save files with. Supported encodings
    are listed at https://www.w3.org/TR/encoding/.
 
     default value: `utf-8`
 
-* `eofnewline`: micro will automatically add a newline to the file.
+* `eofnewline`: micro will automatically add a newline to the end of the
+   file if one does not exist.
 
-	default value: `false`
+	default value: `true`
 
 * `fastdirty`: this determines what kind of algorithm micro uses to determine
    if a buffer is modified or not. When `fastdirty` is on, micro just uses a
@@ -75,10 +96,10 @@ Here are the available options:
    This is fast, but can be inaccurate. If `fastdirty` is off, then micro will
    hash the current buffer against a hash of the original file (created when
    the buffer was loaded). This is more accurate but obviously more resource
-   intensive. This option is only for people who really care about having
-   accurate modified status.
+   intensive. This option will be automatically disabled if the file size
+   exceeds 50KB.
 
-	default value: `true`
+	default value: `false`
 
 * `fileformat`: this determines what kind of line endings micro will use for
    the file. UNIX line endings are just `\n` (linefeed) whereas dos line
@@ -151,6 +172,19 @@ Here are the available options:
 
     default value: `false`
 
+* `pluginchannels`: list of URLs pointing to plugin channels for downloading and
+   installing plugins. A plugin channel consists of a json file with links to
+   plugin repos, which store information about plugin versions and download URLs.
+   By default, this option points to the official plugin channel hosted on GitHub
+   at https://github.com/micro-editor/plugin-channel.
+
+    default value: `https://raw.githubusercontent.com/micro-editor/plugin-channel
+                    /master/channel.json`
+
+* `pluginrepos`: a list of links to plugin repositories.
+
+    default value: ``
+
 * `readonly`: when enabled, disallows edits to the buffer. It is recommended
    to only ever set this option locally using `setlocal`.
 
@@ -263,11 +297,33 @@ Here are the available options:
 
 	default value: `true`
 
+* `xterm`: micro will assume that the terminal it is running in conforms to
+  `xterm-256color` regardless of what the `$TERM` variable actually contains.
+   Enabling this option may cause unwanted effects if your terminal in fact
+   does not conform to the `xterm-256color` standard.
+
+    Default value: `false`
+
 ---
 
 Plugin options: all plugins come with a special option to enable or disable
 them. The option is a boolean with the same name as the plugin itself.
 
+By default, the following plugins are provided, each with an option to enable
+or disable them:
+
+* `autoclose`: automatically closes brackets, quotes, etc...
+* `comment`: provides automatic commenting for a number of languages
+* `ftoptions`: alters some default options depending on the filetype
+* `linter`: provides extensible linting for many languages
+* `literate`: provides advanced syntax highlighting for the Literate
+   programming tool.
+* `status`: provides some extensions to the status line (integration with
+   Git and more).
+* `diff`: integrates the `diffgutter` option with Git. If you are in a Git
+   directory, the diff gutter will show changes with respect to the most
+   recent Git commit rather than the diff since opening the file.
+
 Any option you set in the editor will be saved to the file
 ~/.config/micro/settings.json so, in effect, your configuration file will be 
 created for you. If you'd like to take your configuration with you to another

runtime/help/plugins.md

@@ -11,7 +11,7 @@ from the go plugin, which has the following file structure:
 ```
 ~/.config/micro/plug/go-plugin/
     go.lua
-    info.json
+    repo.json
     help/
         go-plugin.md
 ```
@@ -35,34 +35,6 @@ is unlikely for a plugin to need to add plugin files at runtime or
 syntax header files. No directory structure is enforced but keeping
 runtime files in their own directories is good practice.
 
-# Info file
-
-The `info.json` for the Go plugin is the following:
-
-```
-{
-    "name": "go",
-    "description": "Go formatting and tool support",
-    "website": "https://github.com/micro-editor/go-plugin",
-	"install": "https://github.com/micro-editor/go-plugin",
-    "version": "1.0.0",
-    "require": [
-        "micro >= 2.0.0"
-    ]
-}
-```
-
-All fields are simply interpreted as strings, so the version does not
-need to be a semantic version, and the dependencies are also only
-meant to be parsed by humans. The name should be an identifier, and
-the website should point to a valid website. The install field should
-provide info about installing the plugin, or point to a website that
-provides information.
-
-Note that the name of the plugin is defined by the name field in
-the `info.json` and not by the installation path. Some functions micro
-exposes to plugins require passing the name of the plugin.
-
 ## Lua callbacks
 
 Plugins use Lua but also have access to many functions both from micro
@@ -102,16 +74,6 @@ within.  This is almost always the current bufpane.
 
 All available actions are listed in the keybindings section of the help.
 
-For callbacks to mouse actions, you are also given the event info:
-
-```lua
-function onMousePress(view, event)
-    local x, y = event:Position()
-
-    return false
-end
-```
-
 These functions should also return a boolean specifying whether the bufpane
 should be relocated to the cursor or not after the action is complete.
 
@@ -141,7 +103,12 @@ The packages and functions are listed below (in Go type signatures):
        `-debug` flag, or binary built with `build-dbg`).
 
     - `SetStatusInfoFn(fn string)`: register the given lua function as
-       accessible from the statusline formatting options
+       accessible from the statusline formatting options.
+
+    - `CurPane() *BufPane`: returns the current BufPane, or nil if the
+       current pane is not a BufPane.
+
+    - `CurTab() *Tab`: returns the current tab.
 * `micro/config`
 	- `MakeCommand(name string, action func(bp *BufPane, args[]string),
                    completer buffer.Completer)`:
@@ -424,6 +391,9 @@ There are 6 default plugins that come pre-installed with micro. These are
    programming tool.
 * `status`: provides some extensions to the status line (integration with
    Git and more).
+* `diff`: integrates the `diffgutter` option with Git. If you are in a Git
+   directory, the diff gutter will show changes with respect to the most
+   recent Git commit rather than the diff since opening the file.
 
 See `> help linter`, `> help comment`, and `> help status` for additional
 documentation specific to those plugins.

runtime/plugins/diff/diff.lua

@@ -0,0 +1,20 @@
+VERSION = "1.0.0"
+
+local os = import("os")
+local filepath = import("path/filepath")
+local shell = import("micro/shell")
+
+function onBufferOpen(buf)
+	if buf.Settings["diffgutter"] and (not buf.Type.Scratch) and (buf.Path ~= "") then
+		-- check that file exists
+		local _, err = os.Stat(buf.AbsPath)
+		if err == nil then
+			local dirName, fileName = filepath.Split(buf.AbsPath)
+			local diffBase, err = shell.ExecCommand("git", "-C", dirName, "show", "HEAD:./" .. fileName)
+			if err ~= nil then
+				diffBase = buf:Bytes()
+			end
+			buf:SetDiffBase(diffBase)
+		end
+	end
+end

runtime/plugins/linter/help/linter.md

@@ -66,12 +66,12 @@ the `misspell` linter which checks for misspelled words in a file.
 ```lua
 local config = import("micro/config")
 
+config.RegisterCommonOption("misspell", true)
+
 function init()
     -- uses the default linter plugin
     -- matches any filetype
     linter.makeLinter("misspell", "", "misspell", {"%f"}, "%f:%l:%c: %m", {}, false, true, 0, 0, hasMisspell)
-
-    config.RegisterCommonOption("misspell", true)
 end
 
 function hasMisspell(buf)

runtime/plugins/linter/linter.lua

@@ -6,6 +6,8 @@ local filepath = import("path/filepath")
 local shell = import("micro/shell")
 local buffer = import("micro/buffer")
 local config = import("micro/config")
+local util = import("micro/util")
+local os = import("os")
 
 local linters = {}
 
@@ -66,7 +68,7 @@ function init()
     makeLinter("gcc", "c", "gcc", {"-fsyntax-only", "-Wall", "-Wextra", "%f"}, "%f:%l:%c:.+: %m")
     makeLinter("gcc", "c++", "gcc", {"-fsyntax-only","-std=c++14", "-Wall", "-Wextra", "%f"}, "%f:%l:%c:.+: %m")
     makeLinter("dmd", "d", "dmd", {"-color=off", "-o-", "-w", "-wi", "-c", "%f"}, "%f%(%l%):.+: %m")
-    makeLinter("gobuild", "go", "go", {"build", "-o", devnull}, "%f:%l:%c:? %m")
+    makeLinter("gobuild", "go", "go", {"build", "-o", devnull, "%d"}, "%f:%l:%c:? %m")
     -- makeLinter("golint", "go", "golint", {"%f"}, "%f:%l:%c: %m")
     makeLinter("javac", "java", "javac", {"-d", "%d", "%f"}, "%f:%l: error: %m")
     makeLinter("jshint", "javascript", "jshint", {"%f"}, "%f: line %l,.+, %m")
@@ -102,7 +104,7 @@ end
 function runLinter(buf)
     local ft = buf:FileType()
     local file = buf.Path
-    local dir = filepath.Dir(file)
+    local dir = "." .. util.RuneStr(os.PathSeparator) .. filepath.Dir(file)
 
     for k, v in pairs(linters) do
         local ftmatch = ft == v.filetype

runtime/syntax/LICENSE

@@ -1,6 +1,6 @@
 Micro's syntax files are licensed under the MIT "Expat" License:
 
-Copyright (c) 2016: Zachary Yedidia, Collin Warren, et al.
+Copyright (c) 2020: Zachary Yedidia, et al.
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

runtime/syntax/haskell.yaml

@@ -21,10 +21,10 @@ rules:
 
       # Data constructors
     - constant.bool: "\\b(True|False)\\b"
-    - constant: "(Nothing|Just|Left|Right|LT|EQ|GT)"
+    - constant: "\\b(Nothing|Just|Left|Right|LT|EQ|GT)\\b"
 
       # Data classes
-    - identifier.class: "[ ](Read|Show|Enum|Eq|Ord|Data|Bounded|Typeable|Num|Real|Fractional|Integral|RealFrac|Floating|RealFloat|Monad|MonadPlus|Functor)"
+    - identifier.class: "\\b(Read|Show|Enum|Eq|Ord|Data|Bounded|Typeable|Num|Real|Fractional|Integral|RealFrac|Floating|RealFloat|Monad|MonadPlus|Functor|Foldable|Additive|Zip)[ ]"
 
       # Strings
     - constant.string:

runtime/syntax/html.yaml

@@ -4,44 +4,67 @@ detect:
     filename: "\\.htm[l]?$"
 
 rules:
-    - error: "<[^!].*?>"
-    - symbol.tag: "(?i)<[/]?(a(bbr|cronym|ddress|pplet|rea|rticle|side|udio)?|b(ase(font)?|d(i|o)|ig|lockquote|r)?|ca(nvas|ption)|center|cite|co(de|l|lgroup)|d(ata(list)?|d|el|etails|fn|ialog|ir|l|t)|em(bed)?|fieldset|fig(caption|ure)|font|form|(i)?frame|frameset|h[1-6]|hr|i|img|in(put|s)|kbd|keygen|label|legend|li(nk)?|ma(in|p|rk)|menu(item)?|met(a|er)|nav|no(frames|script)|o(l|pt(group|ion)|utput)|p(aram|icture|re|rogress)?|q|r(p|t|uby)|s(trike)?|samp|se(ction|lect)|small|source|span|strong|su(b|p|mmary)|textarea|time|track|u(l)?|var|video|wbr)( .*|>)*?>"
-    - symbol.tag.extended: "(?i)<[/]?(body|div|html|head(er)?|footer|title|table|t(body|d|h(ead)?|r|foot))( .*)*?>"
-    - special: "&(#[[:digit:]]{1,4}|#x[[:xdigit:]]{1,4}|[^[[:space:]]]+);"
-    - symbol: "[:=]"
-    - identifier: "(alt|bgcolor|height|href|id|label|longdesc|name|on(click|focus|load|mouseover)|size|span|src|target|type|value|width)="
-    - constant.number: "(?i)#[0-9A-F]{6,6}"
-    # - default:
-    #     start: ">"
-    #     end: "<"
-    #     rules: []
-
-    - symbol.tag: "<|>"
-    - constant.string.url: "(ftp(s)?|http(s)?|git|chrome)://[^ 	]+"
-    - preproc: "<!DOCTYPE.+?>"
-
-    - comment:
-        start: "<!--"
-        end: "-->"
-        rules: []
-
-    - constant.string:
-        start: "\""
-        end: "\""
-        skip: "\\\\."
+    # Doctype is case-insensitive
+    - preproc: "<!(?i)(DOCTYPE html.*)>"
+    # Opening tag
+    - symbol.tag:
+        start: "<(a|abbr|acronym|address|applet|area|article|aside|audio|b|base|bdi|bdo|big|blockquote|body|br|button|canvas|caption|center|cite|code|col|colgroup|command|datalist|dd|del|details|dfn|dir|div|dl|dt|em|embed|fieldset|figcaption|figure|font|footer|form|frame|frameset|h[1-6]|head|header|hgroup|hr|html|i|iframe|img|input|ins|kbd|keygen|label|legend|li|link|map|mark|menu|meta|meter|nav|noframes|noscript|object|ol|optgroup|option|output|p|param|pre|progress|q|rp|rt|ruby|s|samp|section|select|small|source|span|strike|strong|sub|summary|sup|table|tbody|td|textarea|tfoot|th|thead|time|title|tr|track|tt|u|ul|var|video|wbr)\\b"
+        end: ">"
         rules:
-            - constant.specialChar: "\\\\."
+          - identifier: "\\b(placeholder|style|alt|bgcolor|height|href|id|(aria|data)\\-.+|label|longdesc|name|on(click|focus|load|mouseover)|size|span|src|target|type|value|width|class|charset|content|rel|integrity|crossorigin|for|onsubmit|lang|role)\\b"
+          - special: "\\b(required)\\b"
+          # Match double-quote strings
+          - constant.string:
+                start: "\""
+                end: "\""
+                skip: "\\\\."
+                rules:
+                  - constant.specialChar: "\\\\."
+                  - constant.string.url: "((ftp(s)?|http(s)?|git|chrome)://[^\\s]+)"
+          # Match single-quote strings
+          - constant.string:
+                start: "'"
+                end: "'"
+                skip: "\\\\."
+                rules:
+                  - constant.specialChar: "\\\\."
+                  - constant.string.url: "((ftp(s)?|http(s)?|git|chrome)://[^\\s]+)"
+          # Highlight the equals and any colon between words
+          - symbol: "\\b(=|:\\b)"
 
+    # Closing tag
+    - symbol.tag:
+        start: "</(a|abbr|acronym|address|applet|area|article|aside|audio|b|base|bdi|bdo|big|blockquote|body|br|button|canvas|caption|center|cite|code|col|colgroup|command|datalist|dd|del|details|dfn|dir|div|dl|dt|em|embed|fieldset|figcaption|figure|font|footer|form|frame|frameset|h[1-6]|head|header|hgroup|hr|html|i|iframe|img|input|ins|kbd|keygen|label|legend|li|link|map|mark|menu|meta|meter|nav|noframes|noscript|object|ol|optgroup|option|output|p|param|pre|progress|q|rp|rt|ruby|s|samp|section|select|small|source|span|strike|strong|sub|summary|sup|table|tbody|td|textarea|tfoot|th|thead|time|title|tr|track|tt|u|ul|var|video|wbr)\\b"
+        end: ">"
+        rules:
+          # Anything in the closing tag is an error
+          - error: "."
+
+    # Reserved entities like a&#12; &nbsp; and &#x12A;
+    - special: "(([a-zA-Z]&#[0-9]+|&[a-zA-Z]+|&#[a-zA-Z0-9]+);)"
+
+    # TODO: Add `limit-rules` to both the `default` rules below once it's implemented into Micro
     - default:
         start: "<script.*?>"
         end: "</script.*?>"
         limit-group: symbol.tag
         rules:
-            - include: "javascript"
+          - include: "javascript"
 
     - default:
         start: "<style.*?>"
         end: "</style.*?>"
         limit-group: symbol.tag
         rules:
-            - include: "css"
+          - include: "css"
+
+    # This weird empty comment thing is technically valid
+    - comment: "<!>"
+
+    - comment.block:
+        start: "<!\\-\\-"
+        end: "\\-\\->"
+        rules:
+          - todo: "(FIXME|NOTE|TODO):?"
+          # While technically not a "true" error, these are recommended to not be used inside a comment
+          - error: "(\\-\\-|>)"

runtime/syntax/v.yaml

@@ -1,7 +1,6 @@
 filetype: v
 
 detect:
-    filename: "\\.v$"
 
 rules:
     # Conditionals and control flow

runtime/syntax/verilog.yaml

@@ -1,7 +1,7 @@
 filetype: verilog
 
 detect:
-    filename: "\\.(vh|sv|svh)$"
+    filename: "\\.(v|vh|sv|svh)$"
 
 rules:
     - preproc: "\\b(module|package|program|endmodule|endpackage|endprogram)\\b"

snapcraft.yaml

@@ -1,11 +1,11 @@
 name: micro
-version: git
 summary: A modern and intuitive terminal-based text editor
 description: |
   Micro is a terminal-based text editor that aims to be easy to use and
   intuitive, while also taking advantage of the full capabilities of modern
   terminals.
 confinement: classic
+adopt-info: micro
 
 apps:
   micro:
@@ -19,7 +19,13 @@ parts:
     build-packages: [make]
     build-snaps: [go]
     build-attributes: [no-patchelf]
+    override-pull: |
+      snapcraftctl pull
+      version="$(go run $SNAPCRAFT_PART_SRC/tools/build-version.go)"
+      [ -n "$(echo $version | grep "dev")" ] && grade=devel || grade=stable
+      snapcraftctl set-version "$version"
+      snapcraftctl set-grade "$grade"
     override-build: |
-      make build
+      make build-tags
       mkdir $SNAPCRAFT_PART_INSTALL/bin
       mv ./micro $SNAPCRAFT_PART_INSTALL/bin/

tools/build-version.go

@@ -31,6 +31,10 @@ func getTag(match ...string) (string, *semver.PRVersion) {
 }
 
 func main() {
+	if tags, err := exec.Command("git", "tag").Output(); err != nil || len(tags) == 0 {
+		// no tags found -- fetch them
+		exec.Command("git", "fetch", "--tags").Run()
+	}
 	// Find the last vX.X.X Tag and get how many builds we are ahead of it.
 	versionStr, ahead := getTag("--match", "v*")
 	version, err := semver.ParseTolerant(versionStr)
@@ -49,7 +53,7 @@ func main() {
 	}
 
 	// If we don't have any tag assume "dev"
-	if tag == "" {
+	if tag == "" || strings.HasPrefix(tag, "nightly") {
 		tag = "dev"
 	}
 	// Get the most likely next version:

tools/testgen.go

@@ -0,0 +1,267 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"regexp"
+	"strings"
+
+	"github.com/robertkrimen/otto/ast"
+	"github.com/robertkrimen/otto/parser"
+)
+
+type walker struct {
+	nodes []ast.Node
+}
+
+func (w *walker) Enter(node ast.Node) ast.Visitor {
+	w.nodes = append(w.nodes, node)
+	return w
+}
+
+func (w *walker) Exit(node ast.Node) {
+}
+
+func getAllNodes(node ast.Node) []ast.Node {
+	w := &walker{}
+	ast.Walk(w, node)
+	return w.nodes
+}
+
+func getCalls(node ast.Node, name string) []*ast.CallExpression {
+	nodes := []*ast.CallExpression{}
+	for _, n := range getAllNodes(node) {
+		if ce, ok := n.(*ast.CallExpression); ok {
+			var calleeName string
+			switch callee := ce.Callee.(type) {
+			case *ast.Identifier:
+				calleeName = callee.Name
+			case *ast.DotExpression:
+				calleeName = callee.Identifier.Name
+			default:
+				continue
+			}
+			if calleeName == name {
+				nodes = append(nodes, ce)
+			}
+		}
+	}
+	return nodes
+}
+
+func getPropertyValue(node ast.Node, key string) ast.Expression {
+	for _, p := range node.(*ast.ObjectLiteral).Value {
+		if p.Key == key {
+			return p.Value
+		}
+	}
+	return nil
+}
+
+type operation struct {
+	startLine   int
+	startColumn int
+	endLine     int
+	endColumn   int
+	text        []string
+}
+
+type check struct {
+	before     []string
+	operations []operation
+	after      []string
+}
+
+type test struct {
+	description string
+	checks      []check
+}
+
+func stringSliceToGoSource(slice []string) string {
+	var b strings.Builder
+	b.WriteString("[]string{\n")
+	for _, s := range slice {
+		b.WriteString(fmt.Sprintf("%#v,\n", s))
+	}
+	b.WriteString("}")
+	return b.String()
+}
+
+func testToGoTest(test test, name string) string {
+	var b strings.Builder
+
+	b.WriteString("func Test")
+	b.WriteString(name)
+	b.WriteString("(t *testing.T) {\n")
+
+	for _, c := range test.checks {
+		b.WriteString("check(\n")
+		b.WriteString("t,\n")
+		b.WriteString(fmt.Sprintf("%v,\n", stringSliceToGoSource(c.before)))
+		b.WriteString("[]operation{\n")
+		for _, op := range c.operations {
+			b.WriteString("operation{\n")
+			b.WriteString(fmt.Sprintf("start: Loc{%v, %v},\n", op.startColumn, op.startLine))
+			b.WriteString(fmt.Sprintf("end: Loc{%v, %v},\n", op.endColumn, op.endLine))
+			b.WriteString(fmt.Sprintf("text: %v,\n", stringSliceToGoSource(op.text)))
+			b.WriteString("},\n")
+		}
+		b.WriteString("},\n")
+		b.WriteString(fmt.Sprintf("%v,\n", stringSliceToGoSource(c.after)))
+		b.WriteString(")\n")
+	}
+
+	b.WriteString("}\n")
+
+	return b.String()
+}
+
+func nodeToStringSlice(node ast.Node) []string {
+	var result []string
+	for _, s := range node.(*ast.ArrayLiteral).Value {
+		result = append(result, s.(*ast.StringLiteral).Value)
+	}
+	return result
+}
+
+func nodeToStringSlice2(node ast.Node) []string {
+	var result []string
+	for _, o := range node.(*ast.ArrayLiteral).Value {
+		result = append(result, getPropertyValue(o, "text").(*ast.StringLiteral).Value)
+	}
+	return result
+}
+
+func nodeToInt(node ast.Node) int {
+	return int(node.(*ast.NumberLiteral).Value.(int64))
+}
+
+func getChecks(node ast.Node) []check {
+	checks := []check{}
+
+	for _, ce := range getCalls(node, "testApplyEdits") {
+		if len(ce.ArgumentList) != 3 {
+			// Wrong function
+			continue
+		}
+
+		before := nodeToStringSlice2(ce.ArgumentList[0])
+		after := nodeToStringSlice2(ce.ArgumentList[2])
+
+		var operations []operation
+		for _, op := range ce.ArgumentList[1].(*ast.ArrayLiteral).Value {
+			args := getPropertyValue(op, "range").(*ast.NewExpression).ArgumentList
+			operations = append(operations, operation{
+				startLine:   nodeToInt(args[0]) - 1,
+				startColumn: nodeToInt(args[1]) - 1,
+				endLine:     nodeToInt(args[2]) - 1,
+				endColumn:   nodeToInt(args[3]) - 1,
+				text:        []string{getPropertyValue(op, "text").(*ast.StringLiteral).Value},
+			})
+		}
+
+		checks = append(checks, check{before, operations, after})
+	}
+
+	for _, ce := range getCalls(node, "testApplyEditsWithSyncedModels") {
+		if len(ce.ArgumentList) > 3 && ce.ArgumentList[3].(*ast.BooleanLiteral).Value {
+			// inputEditsAreInvalid == true
+			continue
+		}
+
+		before := nodeToStringSlice(ce.ArgumentList[0])
+		after := nodeToStringSlice(ce.ArgumentList[2])
+
+		var operations []operation
+		for _, op := range getCalls(ce.ArgumentList[1], "editOp") {
+			operations = append(operations, operation{
+				startLine:   nodeToInt(op.ArgumentList[0]) - 1,
+				startColumn: nodeToInt(op.ArgumentList[1]) - 1,
+				endLine:     nodeToInt(op.ArgumentList[2]) - 1,
+				endColumn:   nodeToInt(op.ArgumentList[3]) - 1,
+				text:        nodeToStringSlice(op.ArgumentList[4]),
+			})
+		}
+
+		checks = append(checks, check{before, operations, after})
+	}
+
+	return checks
+}
+
+func getTests(node ast.Node) []test {
+	tests := []test{}
+	for _, ce := range getCalls(node, "test") {
+		description := ce.ArgumentList[0].(*ast.StringLiteral).Value
+		body := ce.ArgumentList[1].(*ast.FunctionLiteral).Body
+		checks := getChecks(body)
+		if len(checks) > 0 {
+			tests = append(tests, test{description, checks})
+		}
+	}
+	return tests
+}
+
+func main() {
+	var tests []test
+
+	for _, filename := range os.Args[1:] {
+		source, err := ioutil.ReadFile(filename)
+		if err != nil {
+			log.Fatalln(err)
+		}
+
+		program, err := parser.ParseFile(nil, "", source, parser.IgnoreRegExpErrors)
+		if err != nil {
+			log.Fatalln(err)
+		}
+
+		tests = append(tests, getTests(program)...)
+	}
+
+	if len(tests) == 0 {
+		log.Fatalln("no tests found!")
+	}
+
+	fmt.Println("// This file is generated from VSCode model tests by the testgen tool.")
+	fmt.Println("// DO NOT EDIT THIS FILE BY HAND; your changes will be overwritten!\n")
+	fmt.Println("package buffer")
+	fmt.Println(`import "testing"`)
+
+	re := regexp.MustCompile(`[^\w]`)
+	usedNames := map[string]bool{}
+
+	var b strings.Builder
+
+	for _, test := range tests {
+		name := strings.Title(strings.ToLower(test.description))
+		name = re.ReplaceAllLiteralString(name, "")
+		if name == "" {
+			name = "Unnamed"
+		}
+		if usedNames[name] {
+			for i := 2; ; i++ {
+				newName := fmt.Sprintf("%v_%v", name, i)
+				if !usedNames[newName] {
+					name = newName
+					break
+				}
+			}
+		}
+		usedNames[name] = true
+
+		fmt.Println(testToGoTest(test, name))
+
+		b.WriteString("Test")
+		b.WriteString(name)
+		b.WriteString("(nil)\n")
+	}
+
+	fmt.Println("func BenchmarkBuffer(b *testing.B) {")
+	fmt.Println("for i := 0; i < b.N; i++ {")
+	fmt.Print(b.String())
+	fmt.Println("}")
+	fmt.Println("}")
+}