feat: initial Lnk CLI implementation

internal/git/git.go

@@ -0,0 +1,165 @@
+package git
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+// Git handles Git operations
+type Git struct {
+	repoPath string
+}
+
+// New creates a new Git instance
+func New(repoPath string) *Git {
+	return &Git{
+		repoPath: repoPath,
+	}
+}
+
+// Init initializes a new Git repository
+func (g *Git) Init() error {
+	cmd := exec.Command("git", "init")
+	cmd.Dir = g.repoPath
+
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("git init failed: %w\nOutput: %s", err, string(output))
+	}
+
+	return nil
+}
+
+// AddAndCommit stages a file and commits it
+func (g *Git) AddAndCommit(filename, message string) error {
+	// Stage the file
+	if err := g.add(filename); err != nil {
+		return err
+	}
+
+	// Commit the changes
+	if err := g.commit(message); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// RemoveAndCommit removes a file from Git and commits the change
+func (g *Git) RemoveAndCommit(filename, message string) error {
+	// Remove the file from Git
+	if err := g.remove(filename); err != nil {
+		return err
+	}
+
+	// Commit the changes
+	if err := g.commit(message); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// add stages a file
+func (g *Git) add(filename string) error {
+	cmd := exec.Command("git", "add", filename)
+	cmd.Dir = g.repoPath
+
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("git add failed: %w\nOutput: %s", err, string(output))
+	}
+
+	return nil
+}
+
+// remove removes a file from Git tracking
+func (g *Git) remove(filename string) error {
+	cmd := exec.Command("git", "rm", filename)
+	cmd.Dir = g.repoPath
+
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("git rm failed: %w\nOutput: %s", err, string(output))
+	}
+
+	return nil
+}
+
+// commit creates a commit with the given message
+func (g *Git) commit(message string) error {
+	// Configure git user if not already configured
+	if err := g.ensureGitConfig(); err != nil {
+		return err
+	}
+
+	cmd := exec.Command("git", "commit", "-m", message)
+	cmd.Dir = g.repoPath
+
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("git commit failed: %w\nOutput: %s", err, string(output))
+	}
+
+	return nil
+}
+
+// ensureGitConfig ensures that git user.name and user.email are configured
+func (g *Git) ensureGitConfig() error {
+	// Check if user.name is configured
+	cmd := exec.Command("git", "config", "user.name")
+	cmd.Dir = g.repoPath
+	if output, err := cmd.Output(); err != nil || len(strings.TrimSpace(string(output))) == 0 {
+		// Set a default user.name
+		cmd = exec.Command("git", "config", "user.name", "Lnk User")
+		cmd.Dir = g.repoPath
+		if err := cmd.Run(); err != nil {
+			return fmt.Errorf("failed to set git user.name: %w", err)
+		}
+	}
+
+	// Check if user.email is configured
+	cmd = exec.Command("git", "config", "user.email")
+	cmd.Dir = g.repoPath
+	if output, err := cmd.Output(); err != nil || len(strings.TrimSpace(string(output))) == 0 {
+		// Set a default user.email
+		cmd = exec.Command("git", "config", "user.email", "lnk@localhost")
+		cmd.Dir = g.repoPath
+		if err := cmd.Run(); err != nil {
+			return fmt.Errorf("failed to set git user.email: %w", err)
+		}
+	}
+
+	return nil
+}
+
+// GetCommits returns the list of commit messages for testing purposes
+func (g *Git) GetCommits() ([]string, error) {
+	// Check if .git directory exists
+	gitDir := filepath.Join(g.repoPath, ".git")
+	if _, err := os.Stat(gitDir); os.IsNotExist(err) {
+		return []string{}, nil
+	}
+
+	cmd := exec.Command("git", "log", "--oneline", "--format=%s")
+	cmd.Dir = g.repoPath
+
+	output, err := cmd.Output()
+	if err != nil {
+		// If there are no commits yet, return empty slice
+		if strings.Contains(string(output), "does not have any commits yet") {
+			return []string{}, nil
+		}
+		return nil, fmt.Errorf("git log failed: %w", err)
+	}
+
+	commits := strings.Split(strings.TrimSpace(string(output)), "\n")
+	if len(commits) == 1 && commits[0] == "" {
+		return []string{}, nil
+	}
+
+	return commits, nil
+}