go-pathman/envpath/manager.go

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package envpath
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"runtime"
"strings"
)
type envConfig struct {
shell string
shellDesc string
home string
rcFile string
rcScript string
loadFile string
loadScript string
}
var confs []*envConfig
func init() {
home, err := os.UserHomeDir()
if nil != err {
panic(err) // Must get home directory
}
home = filepath.ToSlash(home)
confs = []*envConfig{
&envConfig{
home: home,
shell: "bash",
shellDesc: "bourne-compatible shell (bash)",
rcFile: ".bashrc",
rcScript: "[ -s \"$HOME/.config/envman/load.sh\" ] && source \"$HOME/.config/envman/load.sh\"\n",
loadFile: ".config/envman/load.sh",
loadScript: "for x in ~/.config/envman/*.env; do\n\tsource \"$x\"\ndone\n",
},
&envConfig{
home: home,
shell: "zsh",
shellDesc: "bourne-compatible shell (zsh)",
rcFile: ".zshrc",
rcScript: "[ -s \"$HOME/.config/envman/load.sh\" ] && source \"$HOME/.config/envman/load.sh\"\n",
loadFile: ".config/envman/load.sh",
loadScript: "for x in ~/.config/envman/*.env; do\n\tsource \"$x\"\ndone\n",
},
&envConfig{
home: home,
shell: "fish",
shellDesc: "fish shell",
rcFile: ".config/fish/config.fish",
rcScript: "test -s \"$HOME/.config/envman/load.fish\"; and source \"$HOME/.config/envman/load.fish\"\n",
loadFile: ".config/envman/load.fish",
loadScript: "for x in ~/.config/envman/*.env\n\tsource \"$x\"\nend\n",
},
}
}
func initializeShells(home string) error {
envmand := filepath.Join(home, ".config/envman")
err := os.MkdirAll(envmand, 0755)
if nil != err {
return err
}
var hasRC bool
var nativeMatch *envConfig
for i := range confs {
c := confs[i]
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if filepath.Base(os.Getenv("SHELL")) == c.shell {
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nativeMatch = c
}
_, err := os.Stat(filepath.Join(home, c.rcFile))
if nil != err {
continue
}
hasRC = true
}
// ensure rc
if !hasRC {
if nil == nativeMatch {
return fmt.Errorf(
"%q is not a recognized shell and found none of .bashrc, .zshrc, .config/fish/config.fish",
os.Getenv("SHELL"),
)
}
// touch the rc file
f, err := os.OpenFile(filepath.Join(home, nativeMatch.rcFile), os.O_CREATE|os.O_WRONLY, 0644)
if nil != err {
return err
}
if err := f.Close(); nil != err {
return err
}
}
// MacOS is special. It *requires* .bash_profile in order to read .bashrc
if "darwin" == runtime.GOOS && "bash" == os.Getenv("SHELL") {
if err := ensureBashProfile(home); nil != err {
return err
}
}
//
// Bash (sh, dash, zsh, ksh)
//
// http://www.joshstaiger.org/archives/2005/07/bash_profile_vs.html
for i := range confs {
c := confs[i]
err := c.maybeInitializeShell()
if nil != err {
return err
}
}
return nil
}
func (c *envConfig) maybeInitializeShell() error {
if _, err := os.Stat(filepath.Join(c.home, c.rcFile)); nil != err {
if !os.IsNotExist(err) {
fmt.Fprintf(os.Stderr, "%s\n", err)
}
return nil
}
changed, err := c.initializeShell()
if nil != err {
return err
}
if changed {
fmt.Printf(
"Detected %s shell and updated ~/%s\n",
c.shellDesc,
strings.TrimPrefix(c.rcFile, c.home),
)
}
return nil
}
func (c *envConfig) initializeShell() (bool, error) {
if err := c.ensurePathsLoader(); err != nil {
return false, err
}
// Get current config
// ex: ~/.bashrc
// ex: ~/.config/fish/config.fish
b, err := ioutil.ReadFile(filepath.Join(c.home, c.rcFile))
if nil != err {
return false, err
}
// For Windows, just in case
s := strings.Replace(string(b), "\r\n", "\n", -1)
// Looking to see if loader script has been added to rc file
lines := strings.Split(strings.TrimSpace(s), "\n")
for i := range lines {
line := lines[i]
if line == strings.TrimSpace(c.rcScript) {
// indicate that it was not neccesary to change the rc file
return false, nil
}
}
// Open rc file to append and write
f, err := os.OpenFile(filepath.Join(c.home, c.rcFile), os.O_APPEND|os.O_WRONLY, 0644)
if err != nil {
return false, err
}
// Generate our script
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script := fmt.Sprintf("# Generated for envman. Do not edit.\n%s\n", c.rcScript)
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// If there's not a newline before our template,
// include it in the template. We want nice things.
n := len(lines)
if "" != strings.TrimSpace(lines[n-1]) {
script = "\n" + script
}
// Write and close the rc file
if _, err := f.Write([]byte(script)); err != nil {
return false, err
}
if err := f.Close(); err != nil {
return true, err
}
// indicate that we have changed the rc file
return true, nil
}
func (c *envConfig) ensurePathsLoader() error {
loadFile := filepath.Join(c.home, c.loadFile)
if _, err := os.Stat(loadFile); nil != err {
// Write the loop file. For example:
// $HOME/.config/envman/load.sh
// $HOME/.config/envman/load.fish
// TODO maybe don't write every time
if err := ioutil.WriteFile(
loadFile,
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[]byte(fmt.Sprintf("# Generated for envman. Do not edit.\n%s\n", c.loadScript)),
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os.FileMode(0755),
); nil != err {
return err
}
fmt.Printf("Created %s\n", "~/"+c.loadFile)
}
return nil
}
// I think this issue only affects darwin users with bash as the default shell
func ensureBashProfile(home string) error {
profileFile := filepath.Join(home, ".bash_profile")
// touch the profile file
f, err := os.OpenFile(profileFile, os.O_CREATE|os.O_WRONLY, 0644)
if nil != err {
return err
}
if err := f.Close(); nil != err {
return err
}
b, err := ioutil.ReadFile(profileFile)
if !bytes.Contains(b, []byte(".bashrc")) {
f, err := os.OpenFile(profileFile, os.O_APPEND|os.O_WRONLY, 0644)
if nil != err {
return err
}
sourceBashRC := "[ -s \"$HOME/.bashrc\" ] && source \"$HOME/.bashrc\"\n"
b := []byte(fmt.Sprintf("# Generated for MacOS bash. Do not edit.\n%s\n", sourceBashRC))
_, err = f.Write(b)
if nil != err {
return err
}
fmt.Printf("Updated ~/.bash_profile to source ~/.bashrc\n")
}
return nil
}