feat: validate git repository before executing commands

cmd/commit.go

@@ -73,7 +73,7 @@ var commitCmd = &cobra.Command{
 	Use:   "commit",
 	Short: "Automatically generate commit message",
 	RunE: func(cmd *cobra.Command, args []string) error {
-		if err := check(); err != nil {
+		if err := check(cmd.Context()); err != nil {
 			return err
 		}
 

cmd/hepler.go

@@ -1,22 +1,30 @@
 package cmd
 
 import (
+	"context"
 	"errors"
 	"fmt"
 
+	"github.com/appleboy/CodeGPT/git"
 	"github.com/appleboy/CodeGPT/prompt"
 	"github.com/appleboy/CodeGPT/provider/openai"
 	"github.com/appleboy/CodeGPT/util"
 	"github.com/appleboy/com/file"
 	"github.com/spf13/viper"
 )
 
-func check() error {
+func check(ctx context.Context) error {
 	// Check if the Git command is available on the system's PATH
 	if !util.IsCommandAvailable("git") {
 		return errors.New("git command not found in your system's PATH. Please install Git and try again")
 	}
 
+	// Check if the current directory is a git repository and can execute git diff
+	g := git.New()
+	if err := g.CanExecuteGitDiff(ctx); err != nil {
+		return fmt.Errorf("cannot execute git diff: %w", err)
+	}
+
 	// Apply configuration values from CLI flags to Viper
 	if diffUnified != 3 {
 		viper.Set("git.diff_unified", diffUnified)

cmd/review.go

@@ -35,7 +35,7 @@ var reviewCmd = &cobra.Command{
 	Use:   "review",
 	Short: "Auto review code changes",
 	RunE: func(cmd *cobra.Command, args []string) error {
-		if err := check(); err != nil {
+		if err := check(cmd.Context()); err != nil {
 			return err
 		}
 

git/git.go

@@ -121,6 +121,16 @@ func (c *Command) gitDir(ctx context.Context) *exec.Cmd {
 	)
 }
 
+// checkGitRepository generates the git command to check if the current directory is a git repository.
+func (c *Command) checkGitRepository(ctx context.Context) *exec.Cmd {
+	return exec.CommandContext(
+		ctx,
+		"git",
+		"rev-parse",
+		"--is-inside-work-tree",
+	)
+}
+
 // commit generates the git command to create a commit with the provided message.
 // It includes options to skip pre-commit hooks, sign off the commit, and handle amendments.
 func (c *Command) commit(ctx context.Context, val string) *exec.Cmd {
@@ -163,6 +173,21 @@ func (c *Command) GitDir(ctx context.Context) (string, error) {
 	return string(output), nil
 }
 
+// CanExecuteGitDiff checks if git diff can be executed in the current directory.
+// It returns an error if the current directory is not a git repository or if git diff cannot be executed.
+func (c *Command) CanExecuteGitDiff(ctx context.Context) error {
+	output, err := c.checkGitRepository(ctx).Output()
+	if err != nil {
+		return errors.New("not a git repository (or any of the parent directories)")
+	}
+
+	if strings.TrimSpace(string(output)) != "true" {
+		return errors.New("not inside a git working tree")
+	}
+
+	return nil
+}
+
 // Diff compares the differences between two sets of data.
 // It returns a string representing the differences and an error.
 // If there are no differences, it returns an empty string and an error.

git/git_test.go

@@ -0,0 +1,88 @@
+package git
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestCanExecuteGitDiff(t *testing.T) {
+	// Test in the current directory (which is a git repository)
+	t.Run("in git repository", func(t *testing.T) {
+		cmd := New()
+		ctx := context.Background()
+
+		err := cmd.CanExecuteGitDiff(ctx)
+		if err != nil {
+			t.Errorf("CanExecuteGitDiff() should succeed in a git repository, got error: %v", err)
+		}
+	})
+
+	// Test in a non-git directory
+	t.Run("not in git repository", func(t *testing.T) {
+		// Create a temporary directory
+		tmpDir := t.TempDir()
+
+		// Change to the temporary directory
+		originalDir, err := os.Getwd()
+		if err != nil {
+			t.Fatalf("Failed to get current directory: %v", err)
+		}
+		defer func() {
+			if err := os.Chdir(originalDir); err != nil {
+				t.Logf("Failed to restore directory: %v", err)
+			}
+		}()
+
+		if err := os.Chdir(tmpDir); err != nil {
+			t.Fatalf("Failed to change directory: %v", err)
+		}
+
+		cmd := New()
+		ctx := context.Background()
+
+		err = cmd.CanExecuteGitDiff(ctx)
+		if err == nil {
+			t.Error("CanExecuteGitDiff() should fail in a non-git directory")
+		}
+
+		expectedMsg := "not a git repository"
+		if err != nil && err.Error() != expectedMsg {
+			t.Logf("Got expected error: %v", err)
+		}
+	})
+
+	// Test in a git repository subdirectory
+	t.Run("in git repository subdirectory", func(t *testing.T) {
+		// Create a test subdirectory in the git repository
+		tmpDir := filepath.Join(".", "test_subdir")
+		if err := os.MkdirAll(tmpDir, 0o755); err != nil {
+			t.Fatalf("Failed to create test directory: %v", err)
+		}
+		defer os.RemoveAll(tmpDir)
+
+		// Change to the subdirectory
+		originalDir, err := os.Getwd()
+		if err != nil {
+			t.Fatalf("Failed to get current directory: %v", err)
+		}
+		defer func() {
+			if err := os.Chdir(originalDir); err != nil {
+				t.Logf("Failed to restore directory: %v", err)
+			}
+		}()
+
+		if err := os.Chdir(tmpDir); err != nil {
+			t.Fatalf("Failed to change directory: %v", err)
+		}
+
+		cmd := New()
+		ctx := context.Background()
+
+		err = cmd.CanExecuteGitDiff(ctx)
+		if err != nil {
+			t.Errorf("CanExecuteGitDiff() should succeed in a git repository subdirectory, got error: %v", err)
+		}
+	})
+}