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|
package install
import (
"bufio"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"os/user"
"path/filepath"
)
type bash struct{}
func (bash) Install(cmd, bin string) error {
bashRCFileName, err := bashRCFileName()
if err != nil {
return err
}
completeCmd := completeCmd(cmd, bin)
if isInFile(bashRCFileName, completeCmd) {
return errors.New("Already installed in ~/.bashrc")
}
bashRC, err := os.OpenFile(bashRCFileName, os.O_RDWR|os.O_APPEND, 0)
if err != nil {
return err
}
defer bashRC.Close()
_, err = bashRC.WriteString(fmt.Sprintf("\n%s\n", completeCmd))
return err
}
func (bash) Uninstall(cmd, bin string) error {
bashRC, err := bashRCFileName()
if err != nil {
return err
}
backup := bashRC + ".bck"
err = copyFile(bashRC, backup)
if err != nil {
return err
}
completeCmd := completeCmd(cmd, bin)
if !isInFile(bashRC, completeCmd) {
return errors.New("Does not installed in ~/.bashrc")
}
temp, err := uninstallToTemp(bashRC, completeCmd)
if err != nil {
return err
}
err = copyFile(temp, bashRC)
if err != nil {
return err
}
return os.Remove(backup)
}
func completeCmd(cmd, bin string) string {
return fmt.Sprintf("complete -C %s %s", bin, cmd)
}
func bashRCFileName() (string, error) {
u, err := user.Current()
if err != nil {
return "", err
}
return filepath.Join(u.HomeDir, ".bashrc"), nil
}
func isInFile(name string, lookFor string) bool {
f, err := os.Open(name)
if err != nil {
return false
}
defer f.Close()
r := bufio.NewReader(f)
prefix := []byte{}
for {
line, isPrefix, err := r.ReadLine()
if err == io.EOF {
return false
}
if err != nil {
return false
}
if isPrefix {
prefix = append(prefix, line...)
continue
}
line = append(prefix, line...)
if string(line) == lookFor {
return true
}
prefix = prefix[:0]
}
}
func uninstallToTemp(bashRCFileName, completeCmd string) (string, error) {
rf, err := os.Open(bashRCFileName)
if err != nil {
return "", err
}
defer rf.Close()
wf, err := ioutil.TempFile("/tmp", "bashrc-")
if err != nil {
return "", err
}
defer wf.Close()
r := bufio.NewReader(rf)
prefix := []byte{}
for {
line, isPrefix, err := r.ReadLine()
if err == io.EOF {
break
}
if err != nil {
return "", err
}
if isPrefix {
prefix = append(prefix, line...)
continue
}
line = append(prefix, line...)
str := string(line)
if str == completeCmd {
continue
}
wf.WriteString(str + "\n")
prefix = prefix[:0]
}
return wf.Name(), nil
}
func copyFile(src string, dst string) error {
in, err := os.Open(src)
if err != nil {
return err
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return err
}
defer out.Close()
_, err = io.Copy(out, in)
return err
}
|
