Add optional root argument to gopherjs serve. Fixes #384

jargv · jargv · commit af6637d65dc6 · 2016-03-25T22:55:35.000-06:00
diff --git a/README.md b/README.md
@@ -35,6 +35,8 @@ For example, navigating to `http://localhost:8080/example.com/user/project/` sho
 
 Refreshing in the browser will rebuild the served files if needed. Compilation errors will be displayed in terminal, and in browser console. Additionally, it will serve $GOROOT and $GOPATH for sourcemaps.
 
+If you include an argument, it will be the root from which everything is served. For example, if you run gopherjs serve github.com/user/project then the generated JavaScript for the package github.com/user/project/mypkg will be served at http://localhost:8080/mypkg/mypkg.js.
+
 ### Performance Tips
 
 - Use the `-m` command line flag to generate minified code.
diff --git a/tool.go b/tool.go
@@ -485,7 +485,7 @@ func main() {
 	}
 
 	cmdServe := &cobra.Command{
-		Use:   "serve",
+		Use:   "serve [root]",
 		Short: "compile on-the-fly and serve",
 	}
 	cmdServe.Flags().AddFlag(flagVerbose)
@@ -498,7 +498,24 @@ func main() {
 	cmdServe.Run = func(cmd *cobra.Command, args []string) {
 		options.BuildTags = strings.Fields(*tags)
 		dirs := append(filepath.SplitList(build.Default.GOPATH), build.Default.GOROOT)
-		sourceFiles := http.FileServer(serveCommandFileSystem{options: options, dirs: dirs, sourceMaps: make(map[string][]byte)})
+		var root string
+
+		if len(args) > 1 {
+			cmdServe.Help()
+			return
+		}
+
+		if len(args) == 1 {
+			root = args[0]
+		}
+
+		sourceFiles := http.FileServer(serveCommandFileSystem{
+			serveRoot:  root,
+			options:    options,
+			dirs:       dirs,
+			sourceMaps: make(map[string][]byte),
+		})
+
 		ln, err := net.Listen("tcp", addr)
 		if err != nil {
 			fmt.Fprintln(os.Stderr, err)
@@ -539,12 +556,14 @@ func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
 }
 
 type serveCommandFileSystem struct {
+	serveRoot  string
 	options    *gbuild.Options
 	dirs       []string
 	sourceMaps map[string][]byte
 }
 
-func (fs serveCommandFileSystem) Open(name string) (http.File, error) {
+func (fs serveCommandFileSystem) Open(requestName string) (http.File, error) {
+	name := path.Join(fs.serveRoot, requestName[1:]) // requestName[0] == '/'
 	dir, file := path.Split(name)
 	base := path.Base(dir) // base is parent folder name, which becomes the output file name.
 
@@ -555,7 +574,7 @@ func (fs serveCommandFileSystem) Open(name string) (http.File, error) {
 	if isPkg || isMap || isIndex {
 		// If we're going to be serving our special files, make sure there's a Go command in this folder.
 		s := gbuild.NewSession(fs.options)
-		pkg, err := gbuild.Import(path.Dir(name[1:]), 0, s.InstallSuffix(), fs.options.BuildTags)
+		pkg, err := gbuild.Import(path.Dir(name), 0, s.InstallSuffix(), fs.options.BuildTags)
 		if err != nil || pkg.Name != "main" {
 			isPkg = false
 			isMap = false
