feat: 新增 git.squash 合并提交命令

internal/executor/gitsquash.go

@@ -0,0 +1,120 @@
+package executor
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+// gitSquashOptions are the parsed arguments of `kopsc git squash`.
+type gitSquashOptions struct {
+	Count   int
+	Message string
+}
+
+// runGitSquash merges the last N commits into one.
+func runGitSquash(ctx context.Context, req BuiltinRequest) error {
+	return runGitSquashWith(ctx, req, execGitRunner{})
+}
+
+func runGitSquashWith(ctx context.Context, req BuiltinRequest, runner gitRunner) error {
+	opts, confirmed, err := parseGitSquashArgs(req.Args)
+	if err != nil {
+		return err
+	}
+	confirmed = confirmed || req.Confirmed
+
+	branch, err := currentBranch(ctx, runner)
+	if err != nil {
+		return err
+	}
+
+	// Get the last N commits for preview
+	logOut, _, err := runner.Run(ctx, "log", "-n", strconv.Itoa(opts.Count), "--format=%h %s")
+	if err != nil {
+		return fmt.Errorf("获取提交历史失败: %w", err)
+	}
+
+	commits := strings.Split(strings.TrimSpace(logOut), "\n")
+	if len(commits) < opts.Count {
+		return fmt.Errorf("提交历史不足 %d 个（当前只有 %d 个）", opts.Count, len(commits))
+	}
+
+	// Show preview
+	fmt.Fprintf(req.Stdout, "合并最近 %d 个提交为一个\n\n", opts.Count)
+	fmt.Fprintf(req.Stdout, "分支: %s\n\n", branch)
+	fmt.Fprintln(req.Stdout, "将被合并的提交:")
+	for i, c := range commits[:opts.Count] {
+		fmt.Fprintf(req.Stdout, "  %d. %s\n", i+1, c)
+	}
+
+	// Determine commit message
+	msg := opts.Message
+	if msg == "" {
+		// Use the first (oldest) commit's message
+		parts := strings.SplitN(commits[opts.Count-1], " ", 2)
+		if len(parts) == 2 {
+			msg = parts[1]
+		}
+	}
+	fmt.Fprintf(req.Stdout, "\n新提交消息: %s\n", msg)
+
+	if !confirmed {
+		fmt.Fprintf(req.Stdout, "\n这是破坏性操作，会改变提交历史。加 --yes 确认执行。\n")
+		return &ExitError{Code: 2, Err: errors.New("需要确认")}
+	}
+
+	// Execute squash: reset --soft HEAD~N then commit
+	if _, stderr, err := runner.Run(ctx, "reset", "--soft", fmt.Sprintf("HEAD~%d", opts.Count)); err != nil {
+		return fmt.Errorf("reset 失败: %w\n%s", err, stderr)
+	}
+
+	if _, stderr, err := runner.Run(ctx, "commit", "-m", msg); err != nil {
+		return fmt.Errorf("提交失败: %w\n%s", err, stderr)
+	}
+
+	fmt.Fprintf(req.Stdout, "\n✓ 已将 %d 个提交合并为一个\n", opts.Count)
+	return nil
+}
+
+func parseGitSquashArgs(args []string) (gitSquashOptions, bool, error) {
+	var opts gitSquashOptions
+	var confirmed bool
+	var countStr string
+
+	for i := 0; i < len(args); i++ {
+		arg := args[i]
+		switch {
+		case arg == "--yes" || arg == "-y":
+			confirmed = true
+		case arg == "--message" || arg == "-m":
+			if i+1 >= len(args) {
+				return opts, false, fmt.Errorf("-m 缺少提交消息")
+			}
+			i++
+			opts.Message = args[i]
+		case strings.HasPrefix(arg, "-"):
+			return opts, false, fmt.Errorf("未知选项 %q", arg)
+		default:
+			if countStr == "" {
+				countStr = arg
+			} else {
+				return opts, false, fmt.Errorf("多余的参数 %q", arg)
+			}
+		}
+	}
+
+	if countStr == "" {
+		return opts, false, fmt.Errorf("缺少数量参数；用法: kopsc git squash <数量>")
+	}
+
+	count, err := strconv.Atoi(countStr)
+	if err != nil || count < 2 {
+		return opts, false, fmt.Errorf("数量必须是大于 1 的整数")
+	}
+	opts.Count = count
+
+	return opts, confirmed, nil
+}