From 3e520c699a306682e5dd7647e355aac1b7db0dc1 Mon Sep 17 00:00:00 2001
From: Aki Kareha <aki@kareha.org>
Date: Thu, 26 Mar 2026 10:55:31 +0900
Subject: [PATCH] Add x command

---
 internal/editor/command.go | 18 ++++++++++++++++++
 internal/editor/editor.go  |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/internal/editor/command.go b/internal/editor/command.go
index 4bafc5e..019627b 100644
--- a/internal/editor/command.go
+++ b/internal/editor/command.go
@@ -36,3 +36,21 @@ func (ed *Editor) moveDown(n int) {
 func (ed *Editor) moveUp(n int) {
 	ed.row = max(ed.row-n, 0)
 }
+
+func (ed *Editor) deleteRune(n int) {
+	if len(ed.lines[ed.row]) < 1 {
+		return // XXX ring
+	}
+	rs := []rune(ed.lines[ed.row])
+	if ed.col < 1 {
+		ed.lines[ed.row] = string(rs[1:])
+	} else {
+		head := string(rs[:ed.col])
+		tail := string(rs[ed.col+1:])
+		ed.lines[ed.row] = head + tail
+	}
+	rc := ed.runeCount()
+	if ed.row >= rc-1 {
+		ed.row = rc - 1
+	}
+}
diff --git a/internal/editor/editor.go b/internal/editor/editor.go
index d928390..0e8b8b8 100644
--- a/internal/editor/editor.go
+++ b/internal/editor/editor.go
@@ -265,6 +265,8 @@ func (ed *Editor) Main() {
 					ed.moveDown(1)
 				case 'k':
 					ed.moveUp(1)
+				case 'x':
+					ed.deleteRune(1)
 				}
 			case keyUp:
 				ed.moveUp(1)