diff --git a/cmd/edit.go b/cmd/edit.go
index 368484b..ed9f502 100644
--- a/cmd/edit.go
+++ b/cmd/edit.go
@@ -7,6 +7,8 @@ import (
 	"os"
 	"os/exec"
 	"path"
+	"sort"
+	"strings"
 	"syscall"
 	"time"
 
@@ -23,38 +25,19 @@ func edit(config *config) error {
 }
 
 func _edit(filepaths []string) error {
-	tempDir, err := ioutil.TempDir(os.TempDir(), "edit-pttodo-*")
+	editableDir, err := inEditableDir(filepaths)
 	if err != nil {
 		return err
 	}
-	originals := map[string]pttodo.Root{}
-	lastModified := map[string]time.Time{}
-	for _, target := range filepaths {
-		var original pttodo.Root
-		if r, err := filePathReader(target); err != nil {
-			return err
-		} else if err := yaml.NewDecoder(r).Decode(&original); err != nil {
-			return err
-		} else if c, err := yaml.Marshal(original.Todo); err != nil {
-			return err
-		} else if err := ioutil.WriteFile(path.Join(tempDir, path.Base(target)), c, os.ModePerm); err != nil {
-			return err
-		}
-		originals[target] = original
-		if info, _ := os.Stat(target); info != nil {
-			lastModified[target] = info.ModTime()
-		} else {
-			lastModified[target] = time.Time{}
-		}
-	}
-	if err := vimd(tempDir); err != nil {
+	if err := vimd(editableDir); err != nil {
 		return err
 	}
+
 	for _, target := range filepaths {
 		for {
 			err := func() error {
 				var todos []pttodo.Todo
-				if r, err := filePathReader(path.Join(tempDir, path.Base(target))); err != nil {
+				if r, err := filePathReader(path.Join(editableDir, path.Base(target))); err != nil {
 					return err
 				} else if err := yaml.NewDecoder(r).Decode(&todos); err != nil {
 					return err
@@ -69,13 +52,13 @@ func _edit(filepaths []string) error {
 			if _, err := os.Stdin.Read(b); err != nil {
 				return err
 			}
-			if err := vimd(tempDir); err != nil {
+			if err := vimd(editableDir); err != nil {
 				return err
 			}
 		}
 	}
 	for _, target := range filepaths {
-		r, err := filePathReader(path.Join(tempDir, path.Base(target)))
+		r, err := filePathReader(path.Join(editableDir, path.Base(target)))
 		if err != nil {
 			return err
 		}
@@ -118,6 +101,28 @@ func _edit(filepaths []string) error {
 	return nil
 }
 
+func inEditableDir(filepaths []string) (string, error) {
+	tempDir, err := ioutil.TempDir(os.TempDir(), "edit-pttodo-*")
+	if err != nil {
+		return "", err
+	}
+	return tempDir, copyTodoToDir(tempDir, filepaths)
+}
+
+func copyTodoToDir(d string, filepaths []string) error {
+	for _, target := range filepaths {
+		p := path.Join(d, path.Base(target))
+		if root, err := pttodo.NewRootFromFile(target); err != nil {
+			return err
+		} else if b, err := yaml.Marshal(root.Todo); err != nil {
+			return err
+		} else if err := ioutil.WriteFile(p, b, os.ModePerm); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func vimd(d string) error {
 	bin := "vim"
 	editorbin, err := exec.LookPath(bin)
@@ -159,3 +164,27 @@ func vimd(d string) error {
 	}
 	return nil
 }
+
+func listDir(dname string) ([]string, error) {
+	entries, err := os.ReadDir(dname)
+	if err != nil {
+		return nil, err
+	}
+	paths := make([]string, 0, len(entries))
+	for i := range entries {
+		if entries[i].IsDir() {
+			continue
+		}
+		if strings.HasPrefix(path.Base(entries[i].Name()), ".") {
+			continue
+		}
+		paths = append(paths, path.Join(dname, entries[i].Name()))
+	}
+	sort.Slice(paths, func(i, j int) bool {
+		if path.Base(paths[i]) == "root.yaml" {
+			return true
+		}
+		return paths[i] < paths[j]
+	})
+	return paths, nil
+}
diff --git a/cmd/main_test.go b/cmd/edit_test.go
similarity index 100%
rename from cmd/main_test.go
rename to cmd/edit_test.go
diff --git a/cmd/main.go b/cmd/main.go
index b7dc725..b94964e 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -5,9 +5,6 @@ import (
 	"io"
 	"io/ioutil"
 	"os"
-	"path"
-	"sort"
-	"strings"
 
 	"gogs.inhome.blapointe.com/bel/pttodo/pttodo"
 
@@ -103,27 +100,3 @@ func filePathReader(path string) (io.Reader, error) {
 	}
 	return bytes.NewReader(b), nil
 }
-
-func listDir(dname string) ([]string, error) {
-	entries, err := os.ReadDir(dname)
-	if err != nil {
-		return nil, err
-	}
-	paths := make([]string, 0, len(entries))
-	for i := range entries {
-		if entries[i].IsDir() {
-			continue
-		}
-		if strings.HasPrefix(path.Base(entries[i].Name()), ".") {
-			continue
-		}
-		paths = append(paths, path.Join(dname, entries[i].Name()))
-	}
-	sort.Slice(paths, func(i, j int) bool {
-		if path.Base(paths[i]) == "root.yaml" {
-			return true
-		}
-		return paths[i] < paths[j]
-	})
-	return paths, nil
-}