Added an error page.

internal/http/handlers.go

@@ -37,6 +37,7 @@ func (h *FilesHandlers) Index(w http.ResponseWriter, r *http.Request) {
 	entries, stats, err := files.ScanDirectory(h.directoryPath+path, path)
 	if err != nil {
 		log.Println(err)
+		Error(w, http.StatusNotFound, "", "", r.Referer())
 		return
 	}
 
@@ -56,3 +57,8 @@ func RobotsTxt(w http.ResponseWriter, r *http.Request) {
 	fc, _ := web.AssetsGetFile("robots.txt")
 	w.Write(fc)
 }
+
+func Error(w http.ResponseWriter, code int, reason, message, referer string) {
+	w.WriteHeader(code)
+	web.ErrorXXX("/ "+http.StatusText(code), reason, message, referer, code, w)
+}

web/assets/css/error.css

@@ -0,0 +1,7 @@
+#error {
+    font-size: 3.5rem;
+    line-height: 5rem;
+    text-align: center;
+    margin: 6rem 0; }
+
+#error h1 { font-size: 8rem; }

web/templates/errorXXX.jade

@@ -0,0 +1,24 @@
+extends base.jade
+
+block meta_description
+    meta(name='description' content=http.StatusText(code))
+
+block append head
+    link(href='/assets/css/error.css' rel='stylesheet')
+
+block nav
+    a(href='/') Back to index page
+    h1 #{http.StatusText(code)}
+
+block content
+    :go:func ErrorXXX(title, reason, message, referer string, code int)
+	section#error
+		h1 #{code}
+		| #{http.StatusText(code)}
+        if reason != ""
+            p #{reason}
+        if message != ""
+            p #{message}
+    if referer != ""
+        section
+            h2 #[a(href=referer) Go back]

web/web.go

@@ -7,6 +7,7 @@ import (
 )
 
 //go:generate $GOPATH/bin/jade -pkg=web -stdbuf -writer templates/index.jade
+//go:generate $GOPATH/bin/jade -pkg=web -stdbuf -writer templates/errorXXX.jade
 
 //go:embed assets
 var assetsDir embed.FS