forked from mirror/oddmu
69 lines
1.8 KiB
Go
69 lines
1.8 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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"path/filepath"
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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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path, 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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fp := filepath.FromSlash(path)
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a := fp + ".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 := fp + ".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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