forked from mirror/oddmu
7e5d8b768c
When rendering templates, pass along the directory of the page or data being rendered and if the required template is found in that directory, prefer using that.
67 lines
1.7 KiB
Go
67 lines
1.7 KiB
Go
package main
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import (
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"bytes"
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"github.com/sergi/go-diff/diffmatchpatch"
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"html"
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"html/template"
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"net/http"
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"net/url"
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"os"
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"strings"
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)
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func diffHandler(w http.ResponseWriter, r *http.Request, name string) {
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p, err := loadPage(name)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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p.handleTitle(true)
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p.renderHtml()
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renderTemplate(w, p.Dir(), "diff", p)
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}
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// Diff computes the diff for a page. At this point, renderHtml has already been called so the Name is escaped.
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func (p *Page) Diff() template.HTML {
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name, err := url.PathUnescape(p.Name)
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if err != nil {
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return template.HTML("Cannot unescape " + p.Name)
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}
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a := name + ".md~"
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t1, err := os.ReadFile(a)
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if err != nil {
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return template.HTML("Cannot read " + a + ", so the page is new.")
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}
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b := name + ".md"
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t2, err := os.ReadFile(b)
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if err != nil {
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return template.HTML("Cannot read " + b + ", so the page was deleted.")
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}
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dmp := diffmatchpatch.New()
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diffs := dmp.DiffMain(string(t1), string(t2), false)
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return template.HTML(diff2html(dmp.DiffCleanupSemantic(diffs)))
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}
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func diff2html(diffs []diffmatchpatch.Diff) string {
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var buff bytes.Buffer
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for _, item := range diffs {
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text := strings.ReplaceAll(html.EscapeString(item.Text), "\n", "<br>")
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switch item.Type {
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case diffmatchpatch.DiffInsert:
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_, _ = buff.WriteString("<ins>")
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_, _ = buff.WriteString(text)
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_, _ = buff.WriteString("</ins>")
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case diffmatchpatch.DiffDelete:
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_, _ = buff.WriteString("<del>")
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_, _ = buff.WriteString(text)
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_, _ = buff.WriteString("</del>")
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case diffmatchpatch.DiffEqual:
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_, _ = buff.WriteString("<span>")
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_, _ = buff.WriteString(text)
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_, _ = buff.WriteString("</span>")
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}
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}
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return buff.String()
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}
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