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mataroa: use relative links in Markdown and rewrite them before publi…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| package main | ||
|
|
||
| // DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | ||
| // Version 2, December 2004 | ||
| // | ||
| // Copyright (C) 2024 Thiago Kenji Okada <thiagokokada@gmail.com> | ||
| // | ||
| // Everyone is permitted to copy and distribute verbatim or modified | ||
| // copies of this license document, and changing it is allowed as long | ||
| // as the name is changed. | ||
| // | ||
| // DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | ||
| // TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | ||
| // | ||
| // 0. You just DO WHAT THE FUCK YOU WANT TO. | ||
|
|
||
| import ( | ||
| "log" | ||
| "net/url" | ||
| "strings" | ||
|
|
||
| "github.com/yuin/goldmark" | ||
| "github.com/yuin/goldmark/ast" | ||
| "github.com/yuin/goldmark/parser" | ||
| "github.com/yuin/goldmark/text" | ||
| "github.com/yuin/goldmark/util" | ||
| ) | ||
|
|
||
| // linkRewriter is the main struct for your extension | ||
| type linkRewriter struct { | ||
| posts posts | ||
| } | ||
|
|
||
| // NewLinkRewriter returns a new instance of LinkRewriter | ||
| func NewLinkRewriter(posts posts) *linkRewriter { | ||
| return &linkRewriter{posts} | ||
| } | ||
|
|
||
| // Extend will be called by Goldmark to add your extension | ||
| func (e *linkRewriter) Extend(m goldmark.Markdown) { | ||
| m.Parser().AddOptions(parser.WithASTTransformers(util.Prioritized(e, 0))) | ||
| } | ||
|
|
||
| // Transform is the method that modifies the AST | ||
| func (e *linkRewriter) Transform(node *ast.Document, reader text.Reader, pc parser.Context) { | ||
| ast.Walk(node, func(n ast.Node, entering bool) (ast.WalkStatus, error) { | ||
| if !entering { | ||
| return ast.WalkContinue, nil | ||
| } | ||
| if link, ok := n.(*ast.Link); ok { | ||
| e.rewriteLink(link) | ||
| } | ||
| return ast.WalkContinue, nil | ||
| }) | ||
| } | ||
|
|
||
| // rewriteLink modifies the link URL | ||
| func (e *linkRewriter) rewriteLink(l *ast.Link) { | ||
| link := string(l.Destination) | ||
|
|
||
| if strings.HasPrefix(link, ".") { | ||
| log.Printf("[WARN]: relative link reference found: %s\n", link) | ||
| } | ||
|
|
||
| if strings.HasPrefix(link, "/") { | ||
| post, ok := e.posts.Get(link[1:]) | ||
| if ok { | ||
| dest := must1(url.JoinPath(mataroaBlogUrl, post.slug)) | ||
| l.Destination = []byte(dest) | ||
| } else { | ||
| log.Printf("[WARN]: did not find reference to link: %s\n", link) | ||
| } | ||
| } | ||
| } |
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