serve http, serve webdav: Added a --template flag for user defined markup

cmd/serve/httplib/httplib.go

@@ -52,6 +52,27 @@ inserts leading and trailing "/" on --baseurl, so --baseurl "rclone",
 --baseurl "/rclone" and --baseurl "/rclone/" are all treated
 identically.
 
+--template allows a user to specify a custom markup template for http
+and webdav serve functions.  The server exports the following markup
+to be used within the template to server pages:
+.Name The full path of a file/directory.
+.Title "Directory listing of .Name".
+.Sort The current sort used.  This is changble via ?sort= parameter
+          Sort Options: namedirfist,name,size,time (defailt namedirfirst)
+.Order The current ordering used.  This is changable via ?order= paramter
+           Order Options: asc,desc (default asc)
+.Query Currently unused.
+.Breacrumb Allows for creating a relative navigation
+-- .Link The relative to the root link of the Text.
+-- .Text The Name of the directory.
+.Entries Information about a specific file/directory.
+-- .URL The 'url' of an entry. 
+-- .Leaf Currently same as 'URL' but intended to be 'just' the name.
+-- .IsDir Boolean for if an entry is a directory or not.
+-- .Size Size in Bytes of the entry.
+-- .ModTime The UTC timestamp of an entry.
+
+
 #### Authentication
 
 By default this will serve files without needing a login.
@@ -101,6 +122,7 @@ type Options struct {
 	BasicUser          string        // single username for basic auth if not using Htpasswd
 	BasicPass          string        // password for BasicUser
 	Auth               AuthFn        `json:"-"` // custom Auth (not set by command line flags)
+	Template           string        // User specified template
 }
 
 // AuthFn if used will be used to authenticate user, pass. If an error
@@ -281,7 +303,7 @@ func NewServer(handler http.Handler, opt *Options) *Server {
 		s.httpServer.TLSConfig.ClientAuth = tls.RequireAndVerifyClientCert
 	}
 
-	htmlTemplate, templateErr := data.GetTemplate()
+	htmlTemplate, templateErr := data.GetTemplate(s.Opt.Template)
 	if templateErr != nil {
 		log.Fatalf(templateErr.Error())
 	}