✨Allow plugins to register inline terminator characters

[Copilot]

The inline text rule used a hardcoded, unexpandable set of terminator characters, forcing plugins that need to trigger on non-terminator characters (e.g. w for GFM www. autolinks) to resort to core-rule post-processing workarounds.

Changes

• parser_inline.py: Moves the terminator set onto ParserInline as _terminator_chars (a set[str] seeded from _DEFAULT_TERMINATORS) with a pre-compiled terminator_re: re.Pattern[str] attribute. Exposes add_terminator_char(ch) to extend the set; the regex is rebuilt eagerly only when a genuinely new character is added, keeping zero per-call overhead in the hot path.

• rules_inline/text.py: Drops the module-level _TerminatorChars set and @functools.cache-decorated factory. The text rule now reads state.md.inline.terminator_re directly.

• docs/contributing.md: Updates the "Why is my inline rule not executed?" FAQ to document the new API.

Usage

def gfm_autolink_plugin(md: MarkdownIt) -> None:
    md.inline.add_terminator_char("w")
    md.inline.ruler.push("gfm_autolink_www", _www_rule)

Fully backward-compatible — the default terminator set is unchanged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.84%. Comparing base (d4ea0ca) to head (422176a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #391   +/-   ##
=======================================
  Coverage   95.83%   95.84%           
=======================================
  Files          64       64           
  Lines        3481     3487    +6     
=======================================
+ Hits         3336     3342    +6     
  Misses        145      145           

Flag	Coverage Δ
pytests	95.84% <100.00%> (+<0.01%)	⬆️

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[chrisjsewell]

@copilot fix pre-commit

[Copilot]

@copilot fix pre-commit

Fixed in d5cf7ff — ruff corrected the import ordering and reformatted two expressions in parser_inline.py. All pre-commit checks now pass.