Merge pull request #40 from m4salah/cusome-404-github-page

Custome 404 GitHub page

Author: emad-elsaid

build.go

@@ -56,6 +56,18 @@ func buildStaticSite(dest string) error {
 		}
 	})
 
+	// If we render 404 page
+	// Copy 404 page from dest/404/index.html to /dest/404.html
+	if in, err := os.Open(path.Join(dest, NOT_FOUND_PAGE, "index.html")); err == nil {
+		defer in.Close()
+		out, err := os.Create(path.Join(dest, "404.html"))
+		if err != nil {
+			log.Printf("error while opening dest/404.html, err: %s", err.Error())
+		}
+		defer out.Close()
+		io.Copy(out, in)
+	}
+
 	for route := range extension_page_enclosed {
 		err := buildRoute(
 			srv,

docs/404.md

@@ -0,0 +1,3 @@
+This usually means that you've typed or followed a bad URL. Occasionally, this can happen if the page has been moved to a new URL (though we try to avoid doing that).
+
+See [the Wikipedia page on HTTP 404 errors](https://en.wikipedia.org/wiki/HTTP_404) to learn more about HTTP 404 errors in general.

flags.go

@@ -6,12 +6,13 @@ import (
 )
 
 var (
-	SOURCE   string // path to markdown files directory
-	BUILD    string // path to write built files
-	READONLY bool   // is xlog in readonly mode
-	SITENAME string // name of knowledgebase
-	SIDEBAR  bool   // is sidebar displayed
-	INDEX    string // name of the index page markdown file
+	SOURCE         string // path to markdown files directory
+	BUILD          string // path to write built files
+	READONLY       bool   // is xlog in readonly mode
+	SITENAME       string // name of knowledgebase
+	SIDEBAR        bool   // is sidebar displayed
+	INDEX          string // name of the index page markdown file
+	NOT_FOUND_PAGE string // name of the index page markdown file
 )
 
 func init() {
@@ -23,6 +24,7 @@ func init() {
 	flag.StringVar(&BUILD, "build", "", "Build all pages as static site in this directory")
 	flag.StringVar(&SITENAME, "sitename", "XLOG", "Site name is the name that appears on the header beside the logo and in the title tag")
 	flag.StringVar(&INDEX, "index", "index", "Index file name used as home page")
+	flag.StringVar(&NOT_FOUND_PAGE, "notfoundpage", "404", "Custom not found page")
 	flag.BoolVar(&READONLY, "readonly", false, "Should xlog hide write operations, read-only means all write operations will be disabled")
 	flag.BoolVar(&SIDEBAR, "sidebar", true, "Should render sidebar.")
 }