Refactor codebase for Phase 3

internal/gitutil/git.go

@@ -0,0 +1,59 @@
+package gitutil
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+	"time"
+
+	"gitocean/internal/model"
+	"gitocean/internal/validate"
+)
+
+func Run(dir string, args ...string) error {
+	cmd := exec.Command("git", args...)
+	if dir != "" {
+		cmd.Dir = dir
+	}
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("git %s failed: %s", strings.Join(args, " "), strings.TrimSpace(string(out)))
+	}
+	return nil
+}
+
+func InitBare(path string) error {
+	if err := Run("", "init", "--bare", path); err != nil {
+		return err
+	}
+	return Run("", "--git-dir", path, "symbolic-ref", "HEAD", "refs/heads/main")
+}
+
+func BranchExists(repoPath, branch string) bool {
+	if !validate.Branch(branch) {
+		return false
+	}
+	cmd := exec.Command("git", "--git-dir", repoPath, "rev-parse", "--verify", "refs/heads/"+branch)
+	return cmd.Run() == nil
+}
+
+func Refs(repoPath, prefix string) ([]model.RefInfo, error) {
+	cmd := exec.Command("git", "--git-dir", repoPath, "for-each-ref", "--format=%(refname:short)%00%(objectname)%00%(committerdate:iso8601)%00%(subject)", prefix)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return nil, fmt.Errorf("git refs failed: %s", strings.TrimSpace(string(out)))
+	}
+	var refs []model.RefInfo
+	for _, line := range strings.Split(strings.TrimSpace(string(out)), "\n") {
+		if line == "" {
+			continue
+		}
+		parts := strings.SplitN(line, "\x00", 4)
+		if len(parts) < 4 {
+			continue
+		}
+		date, _ := time.Parse("2006-01-02 15:04:05 -0700", parts[2])
+		refs = append(refs, model.RefInfo{Name: parts[0], Commit: parts[1], Date: date, Message: parts[3]})
+	}
+	return refs, nil
+}