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-rw-r--r--src/cmd/internal/browser/browser.go67
1 files changed, 67 insertions, 0 deletions
diff --git a/src/cmd/internal/browser/browser.go b/src/cmd/internal/browser/browser.go
new file mode 100644
index 0000000..577d317
--- /dev/null
+++ b/src/cmd/internal/browser/browser.go
@@ -0,0 +1,67 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package browser provides utilities for interacting with users' browsers.
+package browser
+
+import (
+ exec "internal/execabs"
+ "os"
+ "runtime"
+ "time"
+)
+
+// Commands returns a list of possible commands to use to open a url.
+func Commands() [][]string {
+ var cmds [][]string
+ if exe := os.Getenv("BROWSER"); exe != "" {
+ cmds = append(cmds, []string{exe})
+ }
+ switch runtime.GOOS {
+ case "darwin":
+ cmds = append(cmds, []string{"/usr/bin/open"})
+ case "windows":
+ cmds = append(cmds, []string{"cmd", "/c", "start"})
+ default:
+ if os.Getenv("DISPLAY") != "" {
+ // xdg-open is only for use in a desktop environment.
+ cmds = append(cmds, []string{"xdg-open"})
+ }
+ }
+ cmds = append(cmds,
+ []string{"chrome"},
+ []string{"google-chrome"},
+ []string{"chromium"},
+ []string{"firefox"},
+ )
+ return cmds
+}
+
+// Open tries to open url in a browser and reports whether it succeeded.
+func Open(url string) bool {
+ for _, args := range Commands() {
+ cmd := exec.Command(args[0], append(args[1:], url)...)
+ if cmd.Start() == nil && appearsSuccessful(cmd, 3*time.Second) {
+ return true
+ }
+ }
+ return false
+}
+
+// appearsSuccessful reports whether the command appears to have run successfully.
+// If the command runs longer than the timeout, it's deemed successful.
+// If the command runs within the timeout, it's deemed successful if it exited cleanly.
+func appearsSuccessful(cmd *exec.Cmd, timeout time.Duration) bool {
+ errc := make(chan error, 1)
+ go func() {
+ errc <- cmd.Wait()
+ }()
+
+ select {
+ case <-time.After(timeout):
+ return true
+ case err := <-errc:
+ return err == nil
+ }
+}