Option to treat control sequences as 0 width#20
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clipperhouse merged 8 commits intomainfrom Feb 8, 2026
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Pull request overview
Adds an IgnoreControlSequences option to treat ANSI/control-sequence graphemes as zero-width, leveraging updated uax29 grapheme parsing.
Changes:
- Add
Options.IgnoreControlSequencesand wire it into grapheme iteration forString/Bytes. - Treat multi-byte grapheme clusters that start with a C0 control byte as width 0.
- Bump
github.com/clipperhouse/uax29/v2dependency tov2.6.0and add tests for ANSI sequences.
Reviewed changes
Copilot reviewed 4 out of 6 changed files in this pull request and generated 4 comments.
| File | Description |
|---|---|
| width.go | Adds new option, forwards it to the grapheme iterator for width calculation, and adjusts width logic for C0-led multi-byte graphemes. |
| width_test.go | Adds tests asserting zero width for ANSI/control sequences when the new option is enabled. |
| go.mod / go.sum | Updates uax29 dependency to v2.6.0. |
| comparison/go.mod / comparison/go.sum | Keeps comparison module dependency graph in sync with updated uax29 version. |
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Pull request overview
Copilot reviewed 7 out of 9 changed files in this pull request and generated no new comments.
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New
IgnoreControlSequencesoption to treat escape sequences as zero width. The actual meaningful change is inuax29, which will parse the sequences as single graphemes. Then indisplaywidthwe simply check the leading character as being C0.