// Copyright 2024 The Gitea Authors. All rights reserved.// SPDX-License-Identifier: MIT package markdown import (	"bytes"	"slices" 	"forgejo.org/modules/markup"	"forgejo.org/modules/setting"	giteautil "forgejo.org/modules/util" 	"github.com/yuin/goldmark/ast") func (g *ASTTransformer) transformLink(ctx *markup.RenderContext, v *ast.Link) {	// Links need their href to munged to be a real value	link := v.Destination 	// Do not process the link if it's not a link, starts with an hashtag	// (indicating it's an anchor link), starts with `mailto:` or any of the	// custom markdown URLs.	processLink := len(link) > 0 && !markup.IsLink(link) &&		link[0] != '#' && !bytes.HasPrefix(link, byteMailto) &&		!slices.ContainsFunc(setting.Markdown.CustomURLSchemes, func(s string) bool {			return bytes.HasPrefix(link, []byte(s+":"))		}) 	if processLink {		var base string		if ctx.IsWiki {			base = ctx.Links.WikiLink()		} else if ctx.Links.HasBranchInfo() {			base = ctx.Links.SrcLink()		} else {			base = ctx.Links.Base		} 		link = []byte(giteautil.URLJoin(base, string(link)))	}	if len(link) > 0 && link[0] == '#' {		link = []byte("#user-content-" + string(link)[1:])	}	v.Destination = link}