refactor(core_editor): extract grapheme boundary helpers into free functions#1068
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…nctions Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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nice cleanup! Thanks! |
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…nctions (nushell#1068) Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Extracts grapheme-boundary computation out of
LineBufferinto a siblinggraphemesmodule as free functions over&str.The two affected
LineBuffermethods become one-line wrappers and behavior is unchanged.The existing methods only ever touched
self.lines, so promoting them to free functions gives one source of truth for grapheme math reedline-wide.Side benefit: deduplicates the
next_back().map(...).unwrap_or(0)pattern inword_right_end_indexandbig_word_right_end_index.Also unblocks helix-mode operations (#1061 and follow-ups) that need to operate on
&strrather than&LineBuffer.14 unit tests cover ASCII, multi-byte UTF-8, CJK, combining marks, ZWJ emoji sequences, and round-trip invariants. Full suite (835) unchanged.