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authorDan Gudmundsson <[email protected]>2017-06-02 14:25:02 +0200
committerDan Gudmundsson <[email protected]>2017-08-16 10:03:28 +0200
commit5f56b49c752a16ee28244981ca9b197ffd5fa691 (patch)
tree17a9563e03ecb40ba4cfe96cea2b89209ed1875b /bootstrap
parentb182febe36aa63eb8290f24ba4b7932673a9a9bc (diff)
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stdlib: Improve edlin handling of unicode chars
Let edlin handle grapheme clusters instead of codepoints to improve the handling multi-codepoints characters. The ttsl driver (and protocol) still expects all lengths as codepoints. Previously it was expected that each codepoint used (at least) one terminal column for each codepoint, and a hack was made for wide characters (multicolumn) by patching in TAGGED characters to occupy the extra space so that codepoint index was equal column index. This didn't work at all for combining codepoints that do not occupy any more space than the previous character. Improved this handling by calculating column positions in move_cursor. This is based on wcwidth() and is not perfect, wcwidth() is wrong for some codepoints and wcwidth() can not know with Hangul graphemes for example. But it works better than before without making a major change in the protocol.
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