feat: add multiline support

[Hellebore]

Summary by Sourcery

Add multiline string support to the YAML formatter CLI tool

New Features:

• Add new --multiline (-m) option to support multiline string formatting

Enhancements:

• Improve CLI usage documentation
• Update command-line argument parsing

Tests:

• Add functional tests for multiline string support

[Hellebore]

This is a benchmark review for experiment bakeoff.
Run ID: bakeoff/benchmark_2025-05-02T11-38-04_v1-36-0-dirty.

This pull request was cloned from https://github.com/xbcsmith/ymlfxr/pull/13. (Note: the URL is not a link to avoid triggering a notification on the original pull request.)

Experiment configuration

review_config:
  # User configuration for the review
  # - benchmark - use the user config from the benchmark reviews
  # - <value> - use the value directly
  user_review_config:
    enable_ai_review: true
    enable_rule_comments: false

    enable_complexity_comments: benchmark
    enable_security_comments: benchmark
    enable_tests_comments: benchmark
    enable_comment_suggestions: benchmark

    enable_pull_request_summary: benchmark
    enable_review_guide: benchmark

    enable_approvals: false
    base_branches: [base-sha.*]

  ai_review_config:
    # The model responses to use for the experiment
    # - benchmark - use the model responses from the benchmark reviews
    # - llm - call the language model to generate responses
    model_responses:
      comments_model: benchmark
      comment_validation_model: benchmark
      comment_suggestion_model: benchmark
      complexity_model: benchmark
      security_model: benchmark
      tests_model: benchmark
      pull_request_summary_model: benchmark
      review_guide_model: benchmark
      overall_comments_model: benchmark

# The pull request dataset to run the experiment on
pull_request_dataset:
# CodeRabbit
- https://github.com/neerajkumar161/node-coveralls-integration/pull/5
- https://github.com/gunner95/vertx-rest/pull/1
- https://github.com/Altinn/altinn-access-management-frontend/pull/1427
- https://github.com/theMr17/github-notifier/pull/14
- https://github.com/bearycool11/AI_memory_Loops/pull/142

# Greptile
- https://github.com/gumloop/guMCP/pull/119
- https://github.com/autoblocksai/python-sdk/pull/335
- https://github.com/grepdemos/ImageSharp/pull/6
- https://github.com/grepdemos/server/pull/61
- https://github.com/websentry-ai/pipelines/pull/25

# Graphite
- https://github.com/KittyCAD/modeling-app/pull/6648
- https://github.com/KittyCAD/modeling-app/pull/6628
- https://github.com/Varedis-Org/AI-Test-Repo/pull/2
- https://github.com/deeep-network/bedrock/pull/198
- https://github.com/Metta-AI/metta/pull/277

# Copilot
- https://github.com/hmcts/rpx-xui-webapp/pull/4438
- https://github.com/ganchdev/quez/pull/104
- https://github.com/xbcsmith/ymlfxr/pull/13
- https://github.com/tinapayy/B-1N1T/pull/36
- https://github.com/coder/devcontainer-features/pull/6

# Questions to ask to label the review comments
review_comment_labels: []
# - label: correct
#   question: Is this comment correct?

# Benchmark reviews generated by running
#   python -m scripts.experiment benchmark <experiment_name>
benchmark_reviews: []

[Hellebore]

Reviewer's Guide

This pull request introduces support for multiline string formatting in the YAML output by adding a new command-line flag.

File-Level Changes

Change	Details	Files
Added a --multiline (-m) command-line flag.	Defined the new flag using the clap crate. Parsed the flag's value from the command-line arguments.	src/main.rs
Enabled multiline YAML output based on the new flag.	Conditionally configured the YamlEmitter to use multiline strings via multiline_strings(true) if the flag is set.	src/main.rs
Updated documentation and examples for the new flag.	Added the --multiline flag description to the usage section. Included an example demonstrating the use of the -m flag.	README.md
Added functional tests for the multiline feature.	Added input (foo.yaml) and expected output (bar.yaml) files for multiline strings. Updated the test script (functest.sh) to execute ymlfxr with the -m flag and verify the output against the expected file.	testdata/functest.sh testdata/bar.yaml testdata/foo.yaml

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[Hellebore]

Hey @Hellebore - I've reviewed your changes - here's some feedback:

• Consider standardizing the argument name used in Arg::new and get_flag to multiline for consistency with the long flag name (--multiline).

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Documentation: all looks good

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