Make the -c flag instead be set as as env variable

README.md

@@ -40,6 +40,7 @@ GET /:path
 | PORT        | The port to listen to requests on                                                       |
 | TOKEN       | GitHub Personal Access Token used for authorization when pulling the content repository |
 | CONTENT_URL | The repository to get content from                                                      |
+| CONTENT_DIR | Directory to serve contents from. Setting this disables the automatic fetching using git and makes the `TOKEN` and `CONTENT_URL` unused. |
 
 ### Flags
 
@@ -48,11 +49,10 @@ GET /:path
 | -v   | Print info messages                          |
 | -vv  | Print more info messages                     |
 | -w   | Reload the contents when they change on disk |
-| -c   | Directory to serve contents from. Setting this disables the automatic fetching using git and makes the `TOKEN` and `CONTENT_URL` unused. |
 
 ## API documentation
 
-http://godoc.org/github.com/datasektionen/taitan  
+http://godoc.org/github.com/datasektionen/taitan
 http://godoc.org/github.com/datasektionen/taitan/parse
 
 ## Public domain

taitan.go

@@ -24,7 +24,6 @@ var (
 	debug      bool   // Show debug level messages.
 	info       bool   // Show info level messages.
 	watch      bool   // Watch for file changes.
-	contentDir string // Serve the `contents` instead of using git to get them from CONTENT_URL
 	responses  Atomic // Our parsed responses.
 )
 
@@ -38,7 +37,6 @@ func init() {
 	flag.BoolVar(&debug, "vv", false, "Print debug messages.")
 	flag.BoolVar(&info, "v", false, "Print info messages.")
 	flag.BoolVar(&watch, "w", false, "Watch for file changes.")
-	flag.StringVar(&contentDir, "c", "", "Serve the `contents` instead of using git to get them from CONTENT_URL")
 	flag.Usage = usage
 	flag.Parse()
 }
@@ -52,7 +50,7 @@ func getEnv(env string) string {
 }
 
 func getRoot() string {
-	if contentDir != "" {
+	if contentDir, ok := os.LookupEnv("CONTENT_DIR"); ok {
 		return contentDir
 	}
 	content := getEnv("CONTENT_URL")
@@ -66,7 +64,7 @@ func getRoot() string {
 }
 
 func getContent() {
-	if contentDir != "" {
+	if _, ok := os.LookupEnv("CONTENT_DIR"); ok {
 		return
 	}
 	content := getEnv("CONTENT_URL")