Merge pull request #48 from JunNishimura/#41

add rev-parse

cmd/revParse.go

@@ -0,0 +1,55 @@
+/*
+Copyright © 2023 NAME HERE <EMAIL ADDRESS>
+*/
+package cmd
+
+import (
+	"fmt"
+	"io/ioutil"
+	"path/filepath"
+	"strings"
+
+	"github.com/spf13/cobra"
+)
+
+func revParse(refNames ...string) error {
+	for _, refName := range refNames {
+		var refPath string
+		if strings.ToLower(refName) == "head" {
+			refPath = filepath.Join(client.RootGoitPath, "refs", "heads", string(client.Head))
+		} else {
+			refPath = filepath.Join(client.RootGoitPath, "refs", "heads", refName)
+		}
+		hashBytes, err := ioutil.ReadFile(refPath)
+		if err != nil {
+			return fmt.Errorf(`fatal: ambiguous argument '%s': unknown revision or path not in the working tree`, refName)
+		}
+		hashString := string(hashBytes)
+		fmt.Println(hashString)
+	}
+	return nil
+}
+
+// revParseCmd represents the revParse command
+var revParseCmd = &cobra.Command{
+	Use:   "rev-parse",
+	Short: "pick out and massage parameters",
+	Long:  "pick out and massage parameters",
+	PreRunE: func(cmd *cobra.Command, args []string) error {
+		if client.RootGoitPath == "" {
+			return ErrGoitNotInitialized
+		}
+		return nil
+	},
+	RunE: func(cmd *cobra.Command, args []string) error {
+		if err := revParse(args...); err != nil {
+			return err
+		}
+
+		return nil
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(revParseCmd)
+}