Allow url construction to work if blog is under a sub-path

src/gmi/tpl.go

@@ -37,6 +37,7 @@ type rendererGetPostSeriesNextPreviousRes struct {
 type renderer struct {
 	url           *url.URL
 	postStore     post.Store
+	gmiPublicURL  *url.URL
 	httpPublicURL *url.URL
 }
 
@@ -92,7 +93,7 @@ func (r renderer) PostBody(p post.StoredPost) (string, error) {
 
 	preprocessFuncs := post.PreprocessFunctions{
 		BlogURL: func(path string) string {
-			return filepath.Join("/", path)
+			return filepath.Join("/", r.gmiPublicURL.Path, path)
 		},
 		AssetURL: func(id string) string {
 			return filepath.Join("/assets", id)
@@ -220,6 +221,7 @@ func (a *api) tplHandler() (gemini.Handler, error) {
 		err := tpl.Execute(buf, renderer{
 			url:           r.URL,
 			postStore:     a.params.PostStore,
+			gmiPublicURL:  a.params.PublicURL,
 			httpPublicURL: a.params.HTTPPublicURL,
 		})
 

src/http/tpl.go

@@ -31,14 +31,16 @@ func (a *api) blogURL(path string, abs bool) string {
 	// filepath.Join strips trailing slash, but we want to keep it
 	trailingSlash := strings.HasSuffix(path, "/")
 
-	res := filepath.Join("/", path)
+	res := filepath.Join("/", a.params.PublicURL.Path, path)
 
 	if trailingSlash && res != "/" {
 		res += "/"
 	}
 
 	if abs {
-		res = a.params.PublicURL.String() + res
+		u := *a.params.PublicURL
+		u.Path = res
+		res = u.String()
 	}
 
 	return res
@@ -88,6 +90,9 @@ func (a *api) tplFuncs() template.FuncMap {
 		"BlogURL": func(path string) string {
 			return a.blogURL(path, false)
 		},
+		"BlogURLAbs": func(path string) string {
+			return a.blogURL(path, true)
+		},
 		"StaticURL": func(path string) string {
 			path = filepath.Join("static", path)
 			return a.blogURL(path, false)

src/http/tpl/follow.html

@@ -114,7 +114,7 @@ emailSubscribe.onclick = async () => {
 </p>
 
 <p>
-  <a href="{{ BlogURL "feed.xml" }}">{{ BlogURL "feed.xml" }}</a>
+  <a href="{{ BlogURLAbs "feed.xml" }}">{{ BlogURLAbs "feed.xml" }}</a>
 </p>
 
 <p>