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dirs.go
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dirs.go
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package tish
import (
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/midbel/tish/internal/stack"
)
type Stack interface {
Cwd() string
Dirs() []string
Chdir(string) error
Pushd(string) error
Popd(string) error
}
const (
dirCurr = "."
dirParent = ".."
dirOld = "-"
)
type dirsstack struct {
list stack.Stack[string]
}
func DirectoryStack() Stack {
return &dirsstack{
list: stack.New[string](),
}
}
func (d *dirsstack) Cwd() string {
return d.list.Curr()
}
func (d *dirsstack) Dirs() []string {
var list []string
for i := d.list.Len() - 1; i >= 0; i-- {
list = append(list, d.list.At(i))
}
return list
}
func (d *dirsstack) Chdir(dir string) error {
switch dir {
case dirCurr:
case dirParent:
dir = d.list.Curr()
d.list.Push(filepath.Dir(dir))
case dirOld:
d.list.Pop()
case "":
// back to home dir
default:
i, err := os.Stat(dir)
if err != nil {
return err
}
if !i.IsDir() {
return fmt.Errorf("%s: not a directory", dir)
}
d.list.Push(dir)
}
return nil
}
func (d *dirsstack) Pushd(dir string) error {
var (
off int
err error
)
switch {
case strings.HasPrefix(dir, "+"):
off, err = strconv.Atoi(dir)
if err == nil {
d.list.RotateLeft(off)
}
case strings.HasPrefix(dir, "-"):
off, err = strconv.Atoi(dir)
if err == nil {
d.list.RotateRight(-off)
}
default:
err = d.Chdir(dir)
}
return err
}
func (d *dirsstack) Popd(dir string) error {
var (
off int
err error
)
switch {
case strings.HasPrefix(dir, "+"):
off, err = strconv.Atoi(dir)
if err == nil {
d.list.RemoveLeft(off)
}
case strings.HasPrefix(dir, "-"):
off, err = strconv.Atoi(dir)
if err == nil {
d.list.RemoveRight(off)
}
default:
d.list.Pop()
}
return err
}