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package completer
import (
"io/ioutil"
"os"
"os/user"
"path/filepath"
"runtime"
prompt "github.com/c-bata/go-prompt"
"github.com/c-bata/go-prompt/internal/debug"
)
var (
// FilePathCompletionSeparator holds separate characters.
FilePathCompletionSeparator = string([]byte{' ', os.PathSeparator})
)
// FilePathCompleter is a completer for your local file system.
// Please caution that you need to set OptionCompletionWordSeparator(completer.FilePathCompletionSeparator)
// when you use this completer.
type FilePathCompleter struct {
Filter func(fi os.FileInfo) bool
IgnoreCase bool
fileListCache map[string][]prompt.Suggest
}
func cleanFilePath(path string) (dir, base string, err error) {
if path == "" {
return ".", "", nil
}
var endsWithSeparator bool
if len(path) >= 1 && path[len(path)-1] == os.PathSeparator {
endsWithSeparator = true
}
if runtime.GOOS != "windows" && len(path) >= 2 && path[0:2] == "~/" {
me, err := user.Current()
if err != nil {
return "", "", err
}
path = filepath.Join(me.HomeDir, path[1:])
}
path = filepath.Clean(os.ExpandEnv(path))
dir = filepath.Dir(path)
base = filepath.Base(path)
if endsWithSeparator {
dir = path + string(os.PathSeparator) // Append slash(in POSIX) if path ends with slash.
base = "" // Set empty string if path ends with separator.
}
return dir, base, nil
}
// Complete returns suggestions from your local file system.
func (c *FilePathCompleter) Complete(d prompt.Document) []prompt.Suggest {
if c.fileListCache == nil {
c.fileListCache = make(map[string][]prompt.Suggest, 4)
}
path := d.GetWordBeforeCursor()
dir, base, err := cleanFilePath(path)
if err != nil {
debug.Log("completer: cannot get current user:" + err.Error())
return nil
}
if cached, ok := c.fileListCache[dir]; ok {
return prompt.FilterHasPrefix(cached, base, c.IgnoreCase)
}
files, err := ioutil.ReadDir(dir)
if err != nil && os.IsNotExist(err) {
return nil
} else if err != nil {
debug.Log("completer: cannot read directory items:" + err.Error())
return nil
}
suggests := make([]prompt.Suggest, 0, len(files))
for _, f := range files {
if c.Filter != nil && !c.Filter(f) {
continue
}
suggests = append(suggests, prompt.Suggest{Text: f.Name()})
}
c.fileListCache[dir] = suggests
return prompt.FilterHasPrefix(suggests, base, c.IgnoreCase)
}
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