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package links
import (
"bytes"
"net/url"
"path"
"strings"
"golang.org/x/net/html"
"mokhan.ca/xlgmokha/gitmal/internal/git"
)
type Set map[string]struct{}
func BuildDirSet(files []git.Blob) Set {
dirs := make(Set)
for _, f := range files {
dir := path.Dir(f.Path)
for dir != "." && dir != "/" {
if _, ok := dirs[dir]; ok {
break
}
dirs[dir] = struct{}{}
if i := strings.LastIndex(dir, "/"); i != -1 {
dir = dir[:i]
} else {
break
}
}
}
return dirs
}
func BuildFileSet(files []git.Blob) Set {
filesSet := make(Set)
for _, f := range files {
filesSet[f.Path] = struct{}{}
}
return filesSet
}
func Resolve(content, currentPath, rootHref, ref string, dirs, files Set) string {
doc, err := html.Parse(strings.NewReader(content))
if err != nil {
return content
}
baseDir := path.Dir(currentPath)
var walk func(*html.Node)
walk = func(n *html.Node) {
if n.Type == html.ElementNode {
switch n.Data {
case "a":
for i, attr := range n.Attr {
if attr.Key == "href" {
newHref := transformHref(attr.Val, baseDir, rootHref, ref, files, dirs)
n.Attr[i].Val = newHref
break
}
}
case "img":
for i, attr := range n.Attr {
if attr.Key == "src" {
newSrc := transformImgSrc(attr.Val, baseDir, rootHref, ref)
n.Attr[i].Val = newSrc
break
}
}
}
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
walk(c)
}
}
walk(doc)
var buf bytes.Buffer
if err := html.Render(&buf, doc); err != nil {
return content
}
return buf.String()
}
func transformHref(href, baseDir, rootHref, ref string, files, dirs Set) string {
if href == "" {
return href
}
if strings.HasPrefix(href, "#") {
return href
}
u, err := url.Parse(href)
if err != nil {
return href
}
// Absolute URLs are left untouched
if u.IsAbs() {
return href
}
// Skip mailto:, javascript:, data: etc. (url.Parse sets Scheme)
if u.Scheme != "" {
return href
}
// Resolve against the directory of the current file
relPath := u.Path
if relPath == "" {
return href
}
var repoPath string
if strings.HasPrefix(relPath, "/") {
// Root-relative repo path
relPath = strings.TrimPrefix(relPath, "/")
repoPath = path.Clean(relPath)
} else {
// Relative to current file directory
repoPath = path.Clean(path.Join(baseDir, relPath))
}
// Decide if this is a file or a directory in the repo
var newPath string
// 1) Exact file match
if _, ok := files[repoPath]; ok {
newPath = repoPath + ".html"
} else if _, ok := files[repoPath+".md"]; ok {
// 2) Maybe the link omitted ".md" but the repo has it
newPath = repoPath + ".md.html"
} else if _, ok := dirs[repoPath]; ok {
// 3) Directory: add /index.html
newPath = path.Join(repoPath, "index.html")
} else {
// Unknown target, leave as-is
return href
}
// Link from the root href
newPath = path.Join(rootHref, "blob", ref, newPath)
// Preserve any query/fragment if they existed
u.Path = newPath
return u.String()
}
func transformImgSrc(src, baseDir, rootHref, ref string) string {
u, err := url.Parse(src)
if err != nil {
return src
}
if u.IsAbs() {
return src
}
relPath := u.Path
var repoPath string
if strings.HasPrefix(relPath, "/") {
// Root-relative: drop leading slash
repoPath = strings.TrimPrefix(relPath, "/")
} else {
// Resolve against current file directory
repoPath = path.Clean(path.Join(baseDir, relPath))
}
final := path.Join(rootHref, "raw", ref, repoPath)
// Preserve any query/fragment if they existed
u.Path = final
return u.String()
}
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