add cli -g to merge in a file

cmd/pttodo-cli/cli.go

@@ -36,12 +36,18 @@ func _main() error {
 		defaultFilepath = "-"
 	}
 	filepath := flag.String("f", defaultFilepath, "($PTTODO_FILE) path to yaml file")
+	filepathToMergeIn := flag.String("g", "", "path to yaml file to merge into -f")
 	root := flag.String("root", DUMP_TODO, "path to pretty print ("+fmt.Sprint([]string{DUMP_ALL, DUMP_TODO, DUMP_SCHEDULED, DUMP_DONE})+")")
 	tags := flag.String("tags", "", "csv of all tags to find")
 	search := flag.String("search", "", "fts case insensitive")
 	e := flag.Bool("e", false, "edit file")
 	dry := flag.Bool("dry", false, "dry run")
 	flag.Parse()
+	if *filepathToMergeIn != "" {
+		if err := merge(*dry, *filepath, *filepathToMergeIn); err != nil {
+			return err
+		}
+	}
 	if *e {
 		if err := edit(*dry, *filepath); err != nil {
 			return err
@@ -54,6 +60,28 @@ func _main() error {
 	return dump(*dry, os.Stdout, *filepath, tagslist, *search, *root)
 }
 
+func verifyRoot(root pttodo.Root) error {
+	f, err := ioutil.TempFile(os.TempDir(), "tmp")
+	if err != nil {
+		return err
+	}
+	f.Close()
+	tempFile := f.Name()
+	b, err := yaml.Marshal(root)
+	if err != nil {
+		return err
+	}
+	if err := ioutil.WriteFile(tempFile, b, os.ModePerm); err != nil {
+		return err
+	}
+	defer os.Remove(tempFile)
+	return verifyFile(tempFile)
+}
+
+func verifyFile(path string) error {
+	return dump(true, io.Discard, path, nil, "", DUMP_ALL)
+}
+
 func edit(dry bool, filepath string) error {
 	var tempFile string
 	cp := func() error {
@@ -115,10 +143,7 @@ func edit(dry bool, filepath string) error {
 		return nil
 	}
 	verify := func() error {
-		if err := dump(true, io.Discard, tempFile, nil, "", DUMP_ALL); err != nil {
-			return fmt.Errorf("failed to verify %s: %v", tempFile, err)
-		}
-		return nil
+		return verifyFile(tempFile)
 	}
 	save := func() error {
 		if dry {
@@ -140,16 +165,69 @@ func edit(dry bool, filepath string) error {
 	return nil
 }
 
+func merge(dry bool, filepath string, mergeTargetFilePath string) error {
+	baseReader, err := filePathReader(filepath)
+	if err != nil {
+		return err
+	}
+	baseB, err := ioutil.ReadAll(baseReader)
+	if err != nil {
+		return err
+	}
+
+	mergingReader, err := filePathReader(mergeTargetFilePath)
+	if err != nil {
+		return err
+	}
+	mergingB, err := ioutil.ReadAll(mergingReader)
+	if err != nil {
+		return err
+	}
+
+	var base, merging pttodo.Root
+	if err := yaml.Unmarshal(baseB, &base); err != nil {
+		return err
+	}
+	if err := yaml.Unmarshal(mergingB, &merging); err != nil {
+		return err
+	}
+
+	base.MergeIn(merging)
+
+	if err := verifyRoot(base); err != nil {
+		return err
+	}
+	tmppath, err := marshalRootToTempFile(base)
+	if err != nil {
+		return err
+	}
+	if dry {
+		log.Printf("would've moved %s to %s when adding %s", tmppath, filepath, mergeTargetFilePath)
+		return nil
+	}
+	return os.Rename(tmppath, filepath)
+}
+
+func marshalRootToTempFile(root pttodo.Root) (string, error) {
+	f, err := ioutil.TempFile(os.TempDir(), "tmp")
+	if err != nil {
+		return "", err
+	}
+	f.Close()
+	os.Remove(f.Name())
+	b, err := yaml.Marshal(root)
+	if err != nil {
+		return "", err
+	}
+	filepath := f.Name() + ".yaml"
+	err = ioutil.WriteFile(filepath, b, os.ModePerm)
+	return filepath, err
+}
+
 func dump(dry bool, writer io.Writer, filepath string, tags []string, search, rootDisplay string) error {
-	var reader io.Reader
-	if filepath == "-" {
-		reader = os.Stdin
-	} else {
-		b, err := ioutil.ReadFile(filepath)
-		if err != nil {
-			return err
-		}
-		reader = bytes.NewReader(b)
+	reader, err := filePathReader(filepath)
+	if err != nil {
+		return err
 	}
 
 	b, err := ioutil.ReadAll(reader)
@@ -214,3 +292,17 @@ func dump(dry bool, writer io.Writer, filepath string, tags []string, search, ro
 	}
 	return os.WriteFile(filepath, b3, os.ModePerm)
 }
+
+func filePathReader(path string) (io.Reader, error) {
+	var reader io.Reader
+	if path == "-" {
+		reader = os.Stdin
+	} else {
+		b, err := ioutil.ReadFile(path)
+		if err != nil {
+			return nil, err
+		}
+		reader = bytes.NewReader(b)
+	}
+	return reader, nil
+}