Extend display_width to handle emojis when unicode-width is disabled
#276
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The unicode-width Cargo feature is used by default to measure the width of the characters. Without it, we used to fall back to a simple model where each character is has a width of one column. However, this is wrong for emojis such as “😂”, which normally take up two columns when printed in a terminal. We now handle such characters as well — we simply assume that all characters above U+1100 is a double-width character. This turns out to be correct for emojis, but it is wrong for many non-emoji characters. To handle those, the unicode-width feature should simply be enabled.
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display_width to handle emojis when unicode-width is disabled
mgeisler
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Jan 15, 2022
After #276, the `display_width` function can handle a limited set of non-ASCII characters. This is enough to make these tests pass both with and without the `unicode-width` Cargo feature.
mgeisler
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Jan 16, 2022
After #276, the `display_width` function can handle a limited set of non-ASCII characters. This is enough to make these tests pass both with and without the `unicode-width` Cargo feature.
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The unicode-width Cargo feature is used by default to measure the width of the characters. Without it, we used to fall back to a simple model where each character is has a width of one column.
However, this is wrong for emojis such as “😂”, which normally take up two columns when printed in a terminal. We now handle such characters as well — we simply assume that all characters above U+1100 is a double-width character.
This turns out to be correct for emojis, but it is wrong for many non-emoji characters. To handle those, the unicode-width feature should simply be enabled.