Initial commit: Azure DevOps TUI client

A terminal-based user interface for browsing and managing Azure DevOps
work items. Features include:

- Browse work items with filtering by area, iteration, state, and type
- View work item details with markdown rendering
- Open work items in browser
- Create git branches from work items
- Update work item state
- Keyboard-driven navigation

🤖 Generated with [Claude Code](https://claude.ai/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

pkg/git/branch.go

@@ -0,0 +1,76 @@
+package git
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+)
+
+// IsGitRepo checks if the current directory is a git repository
+func IsGitRepo() bool {
+	cmd := exec.Command("git", "rev-parse", "--git-dir")
+	err := cmd.Run()
+	return err == nil
+}
+
+// GetCurrentBranch returns the current branch name
+func GetCurrentBranch() (string, error) {
+	cmd := exec.Command("git", "branch", "--show-current")
+	output, err := cmd.Output()
+	if err != nil {
+		return "", fmt.Errorf("getting current branch: %w", err)
+	}
+	return strings.TrimSpace(string(output)), nil
+}
+
+// BranchExists checks if a branch exists
+func BranchExists(name string) bool {
+	cmd := exec.Command("git", "show-ref", "--verify", "--quiet", "refs/heads/"+name)
+	err := cmd.Run()
+	return err == nil
+}
+
+// CreateBranch creates a new branch and optionally checks it out
+func CreateBranch(name string, checkout bool) error {
+	if BranchExists(name) {
+		return fmt.Errorf("branch '%s' already exists", name)
+	}
+
+	if checkout {
+		// Create and checkout
+		cmd := exec.Command("git", "checkout", "-b", name)
+		output, err := cmd.CombinedOutput()
+		if err != nil {
+			return fmt.Errorf("creating branch: %s", strings.TrimSpace(string(output)))
+		}
+	} else {
+		// Just create
+		cmd := exec.Command("git", "branch", name)
+		output, err := cmd.CombinedOutput()
+		if err != nil {
+			return fmt.Errorf("creating branch: %s", strings.TrimSpace(string(output)))
+		}
+	}
+
+	return nil
+}
+
+// CheckoutBranch checks out an existing branch
+func CheckoutBranch(name string) error {
+	cmd := exec.Command("git", "checkout", name)
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("checking out branch: %s", strings.TrimSpace(string(output)))
+	}
+	return nil
+}
+
+// HasUncommittedChanges checks if there are uncommitted changes
+func HasUncommittedChanges() bool {
+	cmd := exec.Command("git", "status", "--porcelain")
+	output, err := cmd.Output()
+	if err != nil {
+		return false
+	}
+	return len(strings.TrimSpace(string(output))) > 0
+}