func MergePullRequest()

in pkg/github/pullrequests.go [309:395]
82 lines of code
12 McCabe index (conditional complexity)

func MergePullRequest(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("merge_pull_request",
			mcp.WithDescription(t("TOOL_MERGE_PULL_REQUEST_DESCRIPTION", "Merge a pull request in a GitHub repository.")),
			mcp.WithToolAnnotation(mcp.ToolAnnotation{
				Title:        t("TOOL_MERGE_PULL_REQUEST_USER_TITLE", "Merge pull request"),
				ReadOnlyHint: false,
			}),
			mcp.WithString("owner",
				mcp.Required(),
				mcp.Description("Repository owner"),
			),
			mcp.WithString("repo",
				mcp.Required(),
				mcp.Description("Repository name"),
			),
			mcp.WithNumber("pullNumber",
				mcp.Required(),
				mcp.Description("Pull request number"),
			),
			mcp.WithString("commit_title",
				mcp.Description("Title for merge commit"),
			),
			mcp.WithString("commit_message",
				mcp.Description("Extra detail for merge commit"),
			),
			mcp.WithString("merge_method",
				mcp.Description("Merge method"),
				mcp.Enum("merge", "squash", "rebase"),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			owner, err := requiredParam[string](request, "owner")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			repo, err := requiredParam[string](request, "repo")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			pullNumber, err := RequiredInt(request, "pullNumber")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			commitTitle, err := OptionalParam[string](request, "commit_title")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			commitMessage, err := OptionalParam[string](request, "commit_message")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			mergeMethod, err := OptionalParam[string](request, "merge_method")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			options := &github.PullRequestOptions{
				CommitTitle: commitTitle,
				MergeMethod: mergeMethod,
			}

			client, err := getClient(ctx)
			if err != nil {
				return nil, fmt.Errorf("failed to get GitHub client: %w", err)
			}
			result, resp, err := client.PullRequests.Merge(ctx, owner, repo, pullNumber, commitMessage, options)
			if err != nil {
				return nil, fmt.Errorf("failed to merge pull request: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != http.StatusOK {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to merge pull request: %s", string(body))), nil
			}

			r, err := json.Marshal(result)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}