Add rainbow_brackets configuration option

This option is similar to the `rulers` config: it can be set no the
editor key in config and also overridden for specific languages, so
you could enable rainbow brackets for lisps for example without
enabling it globally.

book/src/editor.md

@@ -44,6 +44,7 @@
 | `rulers` | List of column positions at which to display the rulers. Can be overridden by language specific `rulers` in `languages.toml` file | `[]` |
 | `bufferline` | Renders a line at the top of the editor displaying open buffers. Can be `always`, `never` or `multiple` (only shown if more than one buffer is in use) | `never` |
 | `color-modes` | Whether to color the mode indicator with different colors depending on the mode itself | `false` |
+| `rainbow-brackets` | Whether to render rainbow colors for matching brackets. Requires tree-sitter `rainbows.scm` queries for the language. | `false` |
 | `text-width` | Maximum line length. Used for the `:reflow` command and soft-wrapping if `soft-wrap.wrap-at-text-width` is set | `80` |
 | `workspace-lsp-roots` | Directories relative to the workspace root that are treated as LSP roots. Should only be set in `.helix/config.toml` | `[]` |
 | `default-line-ending` | The line ending to use for new documents. Can be `native`, `lf`, `crlf`, `ff`, `cr` or `nel`. `native` uses the platform's native line ending (`crlf` on Windows, otherwise `lf`). | `native` |

book/src/languages.md

@@ -71,6 +71,8 @@ These configuration keys are available:
 | `text-width`          |  Maximum line length. Used for the `:reflow` command and soft-wrapping if `soft-wrap.wrap-at-text-width` is set, defaults to `editor.text-width`   |
 | `workspace-lsp-roots`     | Directories relative to the workspace root that are treated as LSP roots. Should only be set in `.helix/config.toml`. Overwrites the setting of the same name in `config.toml` if set. |
 | `persistent-diagnostic-sources` | An array of LSP diagnostic sources assumed unchanged when the language server resends the same set of diagnostics. Helix can track the position for these diagnostics internally instead. Useful for diagnostics that are recomputed on save.
+| `rulers`              | Overrides the `editor.rulers` config key for the language.    |
+| `rainbow-brackets`    | Overrides the `editor.rainbow-brackets` config key for the language. |
 
 ### File-type detection and the `file-types` key
 

helix-core/src/syntax.rs

@@ -169,6 +169,9 @@ pub struct LanguageConfiguration {
     pub workspace_lsp_roots: Option<Vec<PathBuf>>,
     #[serde(default)]
     pub persistent_diagnostic_sources: Vec<String>,
+
+    /// If set, overrides rainbow brackets for a language.
+    pub rainbow_brackets: Option<bool>,
 }
 
 #[derive(Debug, PartialEq, Eq, Hash)]

helix-view/src/editor.rs

@@ -316,6 +316,8 @@ pub struct Config {
     pub rulers: Vec<u16>,
     #[serde(default)]
     pub whitespace: WhitespaceConfig,
+    /// Whether to render rainbow highlights. Defaults to `false`.
+    pub rainbow_brackets: bool,
     /// Persistently display open buffers along the top
     pub bufferline: BufferLine,
     /// Vertical indent width guides.
@@ -964,6 +966,7 @@ impl Default for Config {
             terminal: get_terminal_provider(),
             rulers: Vec::new(),
             whitespace: WhitespaceConfig::default(),
+            rainbow_brackets: false,
             bufferline: BufferLine::default(),
             indent_guides: IndentGuidesConfig::default(),
             color_modes: false,