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diff --git a/book/src/themes.md b/book/src/themes.md new file mode 100644 index 00000000..5c1b5842 --- /dev/null +++ b/book/src/themes.md @@ -0,0 +1,94 @@ +# Themes + +First you'll need to place selected themes in your `themes` directory (i.e `~/.config/helix/themes`), the directory might have to be created beforehand. + +To use a custom theme add `theme = <name>` to your [`config.toml`](./configuration.md) or override it during runtime using `:theme <name>`. + +The default theme.toml can be found [here](https://github.com/helix-editor/helix/blob/master/theme.toml), and user submitted themes [here](https://github.com/helix-editor/helix/blob/master/contrib/themes). + +## Creating a theme + +First create a file with the name of your theme as file name (i.e `mytheme.toml`) and place it in your `themes` directory (i.e `~/.config/helix/themes`). + +Each line in the theme file is specified as below: + +```toml +key = { fg = "#ffffff", bg = "#000000", modifiers = ["bold", "italic"] } +``` + +where `key` represents what you want to style, `fg` specifies the foreground color, `bg` the background color, and `modifiers` is a list of style modifiers. `bg` and `modifiers` can be omitted to defer to the defaults. + +To specify only the foreground color: + +```toml +key = "#ffffff" +``` + +if the key contains a dot `'.'`, it must be quoted to prevent it being parsed as a [dotted key](https://toml.io/en/v1.0.0#keys). + +```toml +"key.key" = "#ffffff" +``` + +Possible modifiers: + +| Modifier | +| --- | +| `bold` | +| `dim` | +| `italic` | +| `underlined` | +| `slow\_blink` | +| `rapid\_blink` | +| `reversed` | +| `hidden` | +| `crossed\_out` | + +Possible keys: + +| Key | Notes | +| --- | --- | +| `attribute` | | +| `keyword` | | +| `keyword.directive` | Preprocessor directives (\#if in C) | +| `namespace` | | +| `punctuation` | | +| `punctuation.delimiter` | | +| `operator` | | +| `special` | | +| `property` | | +| `variable` | | +| `variable.parameter` | | +| `type` | | +| `type.builtin` | | +| `constructor` | | +| `function` | | +| `function.macro` | | +| `function.builtin` | | +| `comment` | | +| `variable.builtin` | | +| `constant` | | +| `constant.builtin` | | +| `string` | | +| `number` | | +| `escape` | Escaped characters | +| `label` | For lifetimes | +| `module` | | +| `ui.background` | | +| `ui.linenr` | | +| `ui.statusline` | | +| `ui.popup` | | +| `ui.window` | | +| `ui.help` | | +| `ui.text` | | +| `ui.text.focus` | | +| `ui.menu.selected` | | +| `ui.selection` | For selections in the editing area | +| `warning` | LSP warning | +| `error` | LSP error | +| `info` | LSP info | +| `hint` | LSP hint | + +These keys match [tree-sitter scopes](https://tree-sitter.github.io/tree-sitter/syntax-highlighting#theme). We half-follow the common scopes from [macromates language grammars](https://macromates.com/manual/en/language_grammars) with some differences. + +For a given highlight produced, styling will be determined based on the longest matching theme key. So it's enough to provide function to highlight `function.macro` and `function.builtin` as well, but you can use more specific scopes to highlight specific cases differently. |