src/serializing/md.rs: improve markdown serialization

[niklak]

• Improved markdown serialization for NodeRef:
  • No longer adds \n\n\ after elements that require a newline at the end if \n\n is already present.
  • Now avoids encoding strings inside code elements, except for the ` character.

Summary by CodeRabbit

• Documentation

  • Updated the changelog to highlight the latest markdown serialization improvements.

• Bug Fixes

  • Resolved issues causing extra newline characters and improved the accuracy of code element rendering.

[coderabbitai]

Walkthrough

This pull request enhances the markdown serialization process for NodeRef by introducing new handling options and adjustments. In CHANGELOG.md, an "Unreleased" section has been added to document these improvements. In src/serializing/md.rs, a new boolean field skip_escape and corresponding method in the Opts struct allow conditional escaping of text. Function signatures for text handling (push_normalized_text and push_escaped_chunk) have been updated with an additional flag, and a new method write_code has been introduced. Test cases have been updated to cover the new behavior.

Changes

File(s)	Change Summary
CHANGELOG.md	Added an "Unreleased" section documenting markdown serialization improvements, including adjustments to newline handling and code element escaping.
src/serializing/md.rs	Introduced a skip_escape boolean field and a corresponding method in the Opts struct; updated push_normalized_text and push_escaped_chunk function signatures with an escape_all flag; added the write_code method; and revised tests to verify escape behavior.

Possibly related PRs

• src/node/serializing.rs: implement format_text #62: Introduces new methods for formatted text in NodeRef, Document, and Selection, which directly relate to improvements in markdown serialization.

Poem

I'm a rabbit with bright code dreams,
Hopping over new flags in streams.
New escapes and tweaks in every line,
Where backticks and newlines perfectly align.
With every hop, my code shines bright — oh, what a sight!
🐇💻

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 36c4077 and f06bbad.

📒 Files selected for processing (2)

• CHANGELOG.md (1 hunks)
• src/serializing/md.rs (13 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: test

🔇 Additional comments (10)

CHANGELOG.md (1)

5-10: Excellent documentation of changes

The new Unreleased section clearly documents the two key improvements made to the markdown serialization:

1. Prevention of redundant newlines
2. Preservation of code content without unnecessary escaping

This follows good changelog practices by documenting user-facing changes in a clear and concise manner.

src/serializing/md.rs (9)

21-21: Good addition of the skip_escape field

This new boolean field in the Opts struct enables the conditional escaping feature that is central to this PR's improvements.

---

45-48: Clean implementation of the builder pattern

The skip_escape method follows the established builder pattern in the Opts struct, maintaining consistency with the existing codebase style.

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129-131: Effective fix for redundant newlines

This check prevents adding redundant newlines when they're already present, which directly addresses one of the stated goals of the PR. The early continue is clean and efficient.

---

190-190: Good addition of code element handling

Adding dedicated code element handling in the write_element function is a logical place for this functionality.

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264-268: Well-implemented code element serialization

The new write_code function properly wraps content with backticks and uses the new skip_escape option, achieving the goal of preserving raw content in code blocks while still escaping backticks.

---

353-353: Proper function signature update

The addition of the escape_all parameter to push_normalized_text allows for contextual escaping behavior.

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382-388: Clean implementation of conditional escaping

The use of a closure to determine which characters should be escaped is elegant and maintainable. When escape_all is true, all special characters are escaped; otherwise, only backticks are escaped.

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530-536: Comprehensive test coverage

The test has been updated to verify both escaping behaviors, ensuring that the new functionality works as expected. Good practice to test both the full escaping and selective escaping modes.

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93-93: Consistent application of new parameter

All calls to push_normalized_text have been updated with the appropriate value for the new escape_all parameter, ensuring consistent behavior throughout the codebase.

Also applies to: 166-166, 221-221

✨ Finishing Touches

• 📝 Generate Docstrings

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.57%. Comparing base (36c4077) to head (f06bbad).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
+ Coverage   94.53%   94.57%   +0.03%     
==========================================
  Files          21       21              
  Lines        4010     4035      +25     
==========================================
+ Hits         3791     3816      +25     
  Misses        219      219              

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