Source file src/pkg/cmd/internal/browser/browser.go

     1	// Copyright 2016 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	// Package browser provides utilities for interacting with users' browsers.
     6	package browser
     7	
     8	import (
     9		"os"
    10		"os/exec"
    11		"runtime"
    12		"time"
    13	)
    14	
    15	// Commands returns a list of possible commands to use to open a url.
    16	func Commands() [][]string {
    17		var cmds [][]string
    18		if exe := os.Getenv("BROWSER"); exe != "" {
    19			cmds = append(cmds, []string{exe})
    20		}
    21		switch runtime.GOOS {
    22		case "darwin":
    23			cmds = append(cmds, []string{"/usr/bin/open"})
    24		case "windows":
    25			cmds = append(cmds, []string{"cmd", "/c", "start"})
    26		default:
    27			if os.Getenv("DISPLAY") != "" {
    28				// xdg-open is only for use in a desktop environment.
    29				cmds = append(cmds, []string{"xdg-open"})
    30			}
    31		}
    32		cmds = append(cmds,
    33			[]string{"chrome"},
    34			[]string{"google-chrome"},
    35			[]string{"chromium"},
    36			[]string{"firefox"},
    37		)
    38		return cmds
    39	}
    40	
    41	// Open tries to open url in a browser and reports whether it succeeded.
    42	func Open(url string) bool {
    43		for _, args := range Commands() {
    44			cmd := exec.Command(args[0], append(args[1:], url)...)
    45			if cmd.Start() == nil && appearsSuccessful(cmd, 3*time.Second) {
    46				return true
    47			}
    48		}
    49		return false
    50	}
    51	
    52	// appearsSuccessful reports whether the command appears to have run successfully.
    53	// If the command runs longer than the timeout, it's deemed successful.
    54	// If the command runs within the timeout, it's deemed successful if it exited cleanly.
    55	func appearsSuccessful(cmd *exec.Cmd, timeout time.Duration) bool {
    56		errc := make(chan error, 1)
    57		go func() {
    58			errc <- cmd.Wait()
    59		}()
    60	
    61		select {
    62		case <-time.After(timeout):
    63			return true
    64		case err := <-errc:
    65			return err == nil
    66		}
    67	}
    68	

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