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// Copyright 2017 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.
// +build !plan9
package main
import (
"bufio"
"context"
"fmt"
"os"
"os/user"
"path/filepath"
"runtime"
"strings"
)
const (
bashConfig = ".bash_profile"
zshConfig = ".zshrc"
)
// appendToPATH adds the given path to the PATH environment variable and
// persists it for future sessions.
func appendToPATH(value string) error {
if isInPATH(value) {
return nil
}
return persistEnvVar("PATH", pathVar+envSeparator+value)
}
func isInPATH(dir string) bool {
p := os.Getenv("PATH")
paths := strings.Split(p, envSeparator)
for _, d := range paths {
if d == dir {
return true
}
}
return false
}
func getHomeDir() (string, error) {
home := os.Getenv(homeKey)
if home != "" {
return home, nil
}
u, err := user.Current()
if err != nil {
return "", err
}
return u.HomeDir, nil
}
func checkStringExistsFile(filename, value string) (bool, error) {
file, err := os.OpenFile(filename, os.O_RDONLY, 0600)
if err != nil {
if os.IsNotExist(err) {
return false, nil
}
return false, err
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
if line == value {
return true, nil
}
}
return false, scanner.Err()
}
func appendToFile(filename, value string) error {
verbosef("Adding %q to %s", value, filename)
ok, err := checkStringExistsFile(filename, value)
if err != nil {
return err
}
if ok {
// Nothing to do.
return nil
}
f, err := os.OpenFile(filename, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600)
if err != nil {
return err
}
defer f.Close()
_, err = f.WriteString(lineEnding + value + lineEnding)
return err
}
func isShell(name string) bool {
return strings.Contains(currentShell(), name)
}
// persistEnvVarWindows sets an environment variable in the Windows
// registry.
func persistEnvVarWindows(name, value string) error {
_, err := runCommand(context.Background(), "powershell", "-command",
fmt.Sprintf(`[Environment]::SetEnvironmentVariable("%s", "%s", "User")`, name, value))
return err
}
func persistEnvVar(name, value string) error {
if runtime.GOOS == "windows" {
if err := persistEnvVarWindows(name, value); err != nil {
return err
}
if isShell("cmd.exe") || isShell("powershell.exe") {
return os.Setenv(strings.ToUpper(name), value)
}
// User is in bash, zsh, etc.
// Also set the environment variable in their shell config.
}
rc, err := shellConfigFile()
if err != nil {
return err
}
line := fmt.Sprintf("export %s=%s", strings.ToUpper(name), value)
if err := appendToFile(rc, line); err != nil {
return err
}
return os.Setenv(strings.ToUpper(name), value)
}
func shellConfigFile() (string, error) {
home, err := getHomeDir()
if err != nil {
return "", err
}
switch {
case isShell("bash"):
return filepath.Join(home, bashConfig), nil
case isShell("zsh"):
return filepath.Join(home, zshConfig), nil
default:
return "", fmt.Errorf("%q is not a supported shell", currentShell())
}
}
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