feat: Add RBS Inline syntax highlighting support (#206)

This pull request adds support for [RBS Inline
syntax](https://github.com/soutaro/rbs-inline/wiki/Syntax-guide)
highlighting within Ruby files.

<img width="2584" height="2584" alt="CleanShot 2025-11-08 at 21 03
59@2x"
src="https://github.com/user-attachments/assets/05976d45-f4c0-410b-83d0-64ce13538dfe"
/>


Resolves #204 
Enabled by joker1007/tree-sitter-rbs#17
Inspired by Shopify/ruby-lsp#3215

Author: marcoroth

extension.toml

@@ -48,7 +48,7 @@ commit = "c70c1de07dedd532089c0c90835c8ed9fa694f5c"
 
 [grammars.rbs]
 repository = "https://github.com/joker1007/tree-sitter-rbs"
-commit = "de893b166476205b09e79cd3689f95831269579a"
+commit = "6bcfa169021a9cc40fb47cd75ef4b4d3767d6ab5"
 
 [[capabilities]]
 kind = "process:exec"

languages/rbs/highlights.scm

@@ -161,3 +161,6 @@
   ","
   "."
 ] @punctuation.delimiter
+
+; RBS Inline prefix (keep comment color)
+(inline_prefix) @comment

languages/ruby/highlights.scm

@@ -143,7 +143,10 @@
   (nil)
 ] @constant.builtin
 
-(comment) @comment
+; Regular comments (exclude RBS inline comments)
+((comment) @comment
+  (#not-match? @comment "^\\s*#[:|]")
+  (#not-match? @comment "^\\s*#\\s*(@rbs|\\|)"))
 
 ; Operators
 

languages/ruby/injections.scm

@@ -7,5 +7,22 @@
   (string_content) @content)
   (#set! "language" "regex"))
 
+; RBS Inline: #: syntax
+((comment) @content
+  (#match? @content "^\\s*#:")
+  (#set! injection.language "rbs"))
+
+; RBS Inline: # @rbs syntax
+((comment) @content
+  (#match? @content "^\\s*#\\s*@rbs")
+  (#set! injection.language "rbs"))
+
+; RBS Inline: continuation lines (e.g., "#| param: Type" or "#    | (?Regexp?) -> void")
+; Note: These will parse with errors since they're not complete RBS on their own,
+; but types within them will still get highlighted
+((comment) @content
+  (#match? @content "^\\s*#\\s*\\|")
+  (#set! injection.language "rbs"))
+
 ((comment) @content
   (#set! injection.language "comment"))