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