mirror of
https://github.com/aljazceru/njump.git
synced 2025-12-17 06:14:22 +01:00
83 lines
2.2 KiB
Go
83 lines
2.2 KiB
Go
package main
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import (
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"io"
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"regexp"
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"strings"
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"github.com/gomarkdown/markdown"
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"github.com/gomarkdown/markdown/ast"
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"github.com/gomarkdown/markdown/html"
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"github.com/gomarkdown/markdown/parser"
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)
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var mdrenderer = html.NewRenderer(html.RendererOptions{
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Flags: html.CommonFlags | html.HrefTargetBlank,
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})
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func stripLinksFromMarkdown(md string) string {
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// Regular expression to match Markdown links and HTML links
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linkRegex := regexp.MustCompile(`\[([^\]]*)\]\([^)]*\)|<a[^>]*>(.*?)</a>`)
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// Replace both Markdown and HTML links with just the link text
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strippedMD := linkRegex.ReplaceAllString(md, "$1$2")
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return strippedMD
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}
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var tgivmdrenderer = html.NewRenderer(html.RendererOptions{
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Flags: html.CommonFlags | html.HrefTargetBlank,
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RenderNodeHook: func(w io.Writer, node ast.Node, entering bool) (ast.WalkStatus, bool) {
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// telegram instant view really doesn't like when there is an image inside a paragraph (like <p><img></p>)
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// so we use this custom thing to stop all paragraphs before the images, print the images then start a new
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// paragraph afterwards.
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if img, ok := node.(*ast.Image); ok {
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if entering {
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src := img.Destination
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w.Write([]byte(`</p><img src="`))
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html.EscLink(w, src)
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w.Write([]byte(`" alt="`))
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} else {
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if img.Title != nil {
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w.Write([]byte(`" title="`))
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html.EscapeHTML(w, img.Title)
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}
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w.Write([]byte(`" /><p>`))
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}
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return ast.GoToNext, true
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}
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return ast.GoToNext, false
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},
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})
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func mdToHTML(md string, usingTelegramInstantView bool, skipLinks bool) string {
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md = strings.ReplaceAll(md, "\u00A0", " ")
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md = replaceNostrURLsWithHTMLTags(nostrEveryMatcher, md)
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// create markdown parser with extensions
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// this parser is stateful so it must be reinitialized every time
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doc := parser.NewWithExtensions(
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parser.CommonExtensions |
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parser.AutoHeadingIDs |
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parser.NoEmptyLineBeforeBlock |
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parser.Footnotes,
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).Parse([]byte(md))
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renderer := mdrenderer
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if usingTelegramInstantView {
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renderer = tgivmdrenderer
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}
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// create HTML renderer with extensions
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output := string(markdown.Render(doc, renderer))
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if skipLinks {
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output = stripLinksFromMarkdown(output)
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}
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// sanitize content
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output = sanitizeXSS(output)
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return output
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}
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