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66 lines
2.0 KiB
Markdown
66 lines
2.0 KiB
Markdown
### Advanced Font Shaping Options
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The `harfbuzz_features` option allows specifying the features to enable when
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using harfbuzz for font shaping.
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There is some light documentation here:
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<https://harfbuzz.github.io/shaping-opentype-features.html>
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but it boils down to allowing opentype feature names to be specified
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using syntax similar to the CSS font-feature-settings options:
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<https://developer.mozilla.org/en-US/docs/Web/CSS/font-feature-settings>.
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The OpenType spec lists a number of features here:
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<https://docs.microsoft.com/en-us/typography/opentype/spec/featurelist>
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Options of likely interest will be:
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* `calt` - <https://docs.microsoft.com/en-us/typography/opentype/spec/features_ae#tag-calt>
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* `clig` - <https://docs.microsoft.com/en-us/typography/opentype/spec/features_ae#tag-clig>
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If you want to disable ligatures in most fonts, then you may want to
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use a setting like this:
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```lua
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config.harfbuzz_features = { 'calt=0', 'clig=0', 'liga=0' }
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```
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Some fonts make available extended options via stylistic sets.
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If you use the [Fira Code font](https://github.com/tonsky/FiraCode),
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it lists available stylistic sets here:
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<https://github.com/tonsky/FiraCode/wiki/How-to-enable-stylistic-sets>
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and you can set them in wezterm:
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```lua
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-- Use this for a zero with a dot rather than a line through it
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-- when using the Fira Code font
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config.harfbuzz_features = { 'zero' }
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```
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{{since('20220101-133340-7edc5b5a')}}
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You can specify `harfbuzz_features` on a per-font basis, rather than
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globally for all fonts:
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```lua
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config.font = wezterm.font {
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family = 'JetBrains Mono',
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harfbuzz_features = { 'calt=0', 'clig=0', 'liga=0' },
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}
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```
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and this example disables ligatures for JetBrains Mono,
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but keeps the default for the other fonts in the fallback:
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```lua
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config.font = wezterm.font_with_fallback {
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{
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family = 'JetBrains Mono',
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weight = 'Medium',
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harfbuzz_features = { 'calt=0', 'clig=0', 'liga=0' },
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},
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{ family = 'Terminus', weight = 'Bold' },
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'Noto Color Emoji',
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}
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```
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