Support bracket colorization (rainbow brackets) (#43172)

Deals with https://github.com/zed-industries/zed/issues/5259

Highlights brackets with different colors based on their depth.
Uses existing tree-sitter queries from brackets.scm to find brackets,
uses theme's accents to color them.


https://github.com/user-attachments/assets/cc5f3aba-22fa-446d-9af7-ba6e772029da

1. Adds `colorize_brackets` language setting that allows, per language
or globally for all languages, to configure whether Zed should color the
brackets for a particular language.

Disabled for all languages by default.

2. Any given language can opt-out a certain bracket pair by amending the
brackets.scm like `("\"" @open "\"" @close) ` -> `(("\"" @open "\""
@close) (#set! rainbow.exclude))`

3. Brackets are using colors from theme accents, which can be overridden
as

```jsonc
"theme_overrides": {
  "One Dark": {
    "accents": ["#ff69b4", "#7fff00", "#ff1493", "#00ffff", "#ff8c00", "#9400d3"]
  }
},
```

Release Notes:

- Added bracket colorization (rainbow brackets) support. Use
`colorize_brackets` language setting to enable.

---------

Co-authored-by: MrSubidubi <dev@bahn.sh>
Co-authored-by: Lukas Wirth <lukas@zed.dev>
Co-authored-by: MrSubidubi <finn@zed.dev>
Co-authored-by: Lukas Wirth <me@lukaswirth.dev>
Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>

crates/multi_buffer/src/multi_buffer.rs

@@ -18,10 +18,10 @@ use collections::{BTreeMap, Bound, HashMap, HashSet};
 use gpui::{App, Context, Entity, EntityId, EventEmitter};
 use itertools::Itertools;
 use language::{
-    AutoindentMode, Buffer, BufferChunks, BufferRow, BufferSnapshot, Capability, CharClassifier,
-    CharKind, CharScopeContext, Chunk, CursorShape, DiagnosticEntryRef, DiskState, File,
-    IndentGuideSettings, IndentSize, Language, LanguageScope, OffsetRangeExt, OffsetUtf16, Outline,
-    OutlineItem, Point, PointUtf16, Selection, TextDimension, TextObject, ToOffset as _,
+    AutoindentMode, BracketMatch, Buffer, BufferChunks, BufferRow, BufferSnapshot, Capability,
+    CharClassifier, CharKind, CharScopeContext, Chunk, CursorShape, DiagnosticEntryRef, DiskState,
+    File, IndentGuideSettings, IndentSize, Language, LanguageScope, OffsetRangeExt, OffsetUtf16,
+    Outline, OutlineItem, Point, PointUtf16, Selection, TextDimension, TextObject, ToOffset as _,
     ToPoint as _, TransactionId, TreeSitterOptions, Unclipped,
     language_settings::{LanguageSettings, language_settings},
 };
@@ -5400,7 +5400,6 @@ impl MultiBufferSnapshot {
     {
         let range = range.start.to_offset(self)..range.end.to_offset(self);
         let mut excerpt = self.excerpt_containing(range.clone())?;
-
         Some(
             excerpt
                 .buffer()
@@ -5410,15 +5409,17 @@ impl MultiBufferSnapshot {
                         BufferOffset(pair.open_range.start)..BufferOffset(pair.open_range.end);
                     let close_range =
                         BufferOffset(pair.close_range.start)..BufferOffset(pair.close_range.end);
-                    if excerpt.contains_buffer_range(open_range.start..close_range.end) {
-                        Some((
-                            excerpt.map_range_from_buffer(open_range),
-                            excerpt.map_range_from_buffer(close_range),
-                        ))
-                    } else {
-                        None
-                    }
-                }),
+                    excerpt
+                        .contains_buffer_range(open_range.start..close_range.end)
+                        .then(|| BracketMatch {
+                            open_range: excerpt.map_range_from_buffer(open_range),
+                            close_range: excerpt.map_range_from_buffer(close_range),
+                            color_index: pair.color_index,
+                            newline_only: pair.newline_only,
+                            syntax_layer_depth: pair.syntax_layer_depth,
+                        })
+                })
+                .map(BracketMatch::bracket_ranges),
         )
     }