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package fs
import (
"os"
"os/user"
"path/filepath"
"strings"
"sync"
)
var (
cwdLock = sync.Mutex{}
)
// Expand will expand a path with ~ to the $HOME of the current user.
func Expand(path string) (string, error) {
if path == "" {
return path, nil
}
home := os.Getenv("HOME")
if home == "" {
usr, err := user.Current()
if err != nil {
return "", err
}
home = usr.HomeDir
}
return filepath.Abs(strings.Replace(path, "~", home, 1))
}
// Exists returns true if the path exists.
func Exists(path string) bool {
if _, err := os.Stat(path); os.IsNotExist(err) {
return false
}
return true
}
// Chdir changes the process current working directory to the specified
// one, executes the callback and then restores the original working directory.
func Chdir(path string, cb func() error) error {
cwdLock.Lock()
defer cwdLock.Unlock()
cwd, err := os.Getwd()
if err != nil {
return err
}
// make sure that whatever happens we restore the original
// working directory of the process
defer func() {
if err := os.Chdir(cwd); err != nil {
panic(err)
}
}()
// change folder
if err := os.Chdir(path); err != nil {
return err
}
// run the callback once inside the folder
return cb()
}
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