feat: first impl of the init function

main.go

@@ -2,18 +2,86 @@ package main
 
 import (
 	"context"
+	"fmt"
 	"log"
 	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
 
 	"github.com/urfave/cli/v3"
 )
 
-func main (){
+func exists(path string) bool {
+	_, err := os.Stat(path)
+	return !os.IsNotExist(err)
+}
+
+func Getwtd() (string, error) {
+	hd, err := os.UserHomeDir()
+	if err != nil {
+		return "", err
+	}
+	wtd := filepath.Join(hd, ".wt")
+	if !exists(wtd) {
+		if err := os.Mkdir(wtd, 0o755); err != nil {
+			return "", err
+		}
+	}
+
+	return wtd, nil
+}
+
+func Init(ctx context.Context, cmd *cli.Command) error {
+	fmt.Println("init")
+	cwd, err := os.Getwd()
+	if err != nil {
+		return err
+	}
+	wtd, err := Getwtd()
+	if err != nil {
+		return err
+	}
+	if cmd.Args().Get(0) != "" {
+		cwd, err = filepath.Abs(cmd.Args().Get(0))
+		if err != nil {
+			return err
+		}
+	}
+	if !exists(cwd) {
+		return fmt.Errorf("%s does not exists", cwd)
+	}
+	project := filepath.Join(wtd, filepath.Base(cwd))
+	if !exists(project) {
+		if err := os.Mkdir(project, 0o755); err != nil {
+			return err
+		}
+		c := exec.Command("git", "branch", "--show-current")
+		c.Dir = cwd
+		out, err := c.Output()
+		if err != nil {
+			return err
+		}
+		branch := strings.TrimSpace(string(out))
+		worktree := filepath.Join(project, branch)
+		if err := os.Rename(cwd, worktree); err != nil {
+			return err
+		}
+		if err := os.Symlink(worktree, cwd); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func main() {
 	cmd := cli.Command{
 		Name: "wt",
 		Commands: []*cli.Command{
 			{
 				Name:   "init",
+				Action: Init,
 			},
 			{
 				Name: "clone",