feat(language): Add Scala support with tree-sitter parsing

crates/tabby-common/assets/languages.toml

@@ -355,7 +355,44 @@ exts = ["sql"]
 
 [[config]]
 languages = ["scala"]
-exts = ["scala"]
+exts = ["scala", "sbt"]
+line_comment = "//"
+top_level_keywords = [
+    "abstract",
+    "case",
+    "class",
+    "def",
+    "do",
+    "else",
+    "enum",
+    "extends",
+    "final",
+    "for",
+    "given",
+    "if",
+    "implicit",
+    "import",
+    "lazy",
+    "match",
+    "new",
+    "object",
+    "override",
+    "package",
+    "private",
+    "protected",
+    "return",
+    "sealed",
+    "then",
+    "throw",
+    "trait",
+    "try",
+    "type",
+    "val",
+    "var",
+    "while",
+    "with",
+    "yield",
+]
 
 [[config]]
 languages = ["shellscript"]

crates/tabby-index/Cargo.toml

@@ -12,6 +12,7 @@ tantivy = { workspace = true }
 tracing = { workspace = true }
 tree-sitter-tags = "0.22.6"
 lazy_static = { workspace = true }
+tree-sitter-scala = "0.22.1"
 tree-sitter-python = "0.21.0"
 tree-sitter-java = "0.21.0"
 tree-sitter-kotlin = "0.3.6"

crates/tabby-index/queries/scala.scm

@@ -0,0 +1,68 @@
+
+(class_definition
+  name: (identifier) @name) @definition.class
+
+(enum_definition
+  name: (identifier) @name) @definition.enum
+
+(object_definition
+  name: (identifier) @name) @definition.object
+
+(object_definition
+  name: (identifier) @name) @definition.trait
+
+
+(class_parameter
+  name: (identifier) @name) @definition.class_parameter
+
+(self_type (identifier) @name) @definition.parameter
+
+(type_definition
+  name: (type_identifier) @name) @definition.type
+
+
+(val_definition
+  pattern: (identifier) @name) @definition.val
+
+(var_definition
+  pattern: (identifier) @name) @definition.var
+
+(val_declaration
+  name: (identifier) @name) @definition.val_decl
+
+(var_declaration
+  name: (identifier) @name) @definition.var_decl
+
+
+
+(call_expression
+  function: (identifier) @name) @reference.call
+
+(call_expression
+  function: (operator_identifier) @name) @reference.call
+
+(call_expression
+  function: (field_expression
+    field: (identifier) @name)) @reference.call
+
+((call_expression
+   function: (identifier) @name)
+ (#match? @name "^[A-Z]")) @reference.constructor
+
+(generic_function
+  function: (identifier) @name) @reference.call
+
+(interpolated_string_expression
+  interpolator: (identifier) @name) @reference.call
+
+
+(function_definition
+  name: (identifier) @name) @definition.function
+
+
+(function_declaration
+      name: (identifier) @name) @definition.function
+
+(function_definition
+      name: (identifier) @name) @definition.function
+

crates/tabby-index/src/code/languages.rs

@@ -48,6 +48,17 @@ lazy_static! {
                     .unwrap(),
                 ),
             ),
+            (
+                "scala",
+                TagsConfigurationSync(
+                    TagsConfiguration::new(
+                        tree_sitter_scala::language(),
+                        include_str!("../../queries/scala.scm"),
+                        "",
+                    )
+                    .unwrap(),
+                ),
+            ),
             (
                 "kotlin",
                 TagsConfigurationSync(

website/docs/references/programming-languages.md

@@ -39,6 +39,7 @@ For an actual example of an issue or pull request adding the above support, plea
 * [Elixir](https://elixir-lang.org)
 * [OCaml](https://ocaml.org/)
 * [GDScript](https://gdscript.com/)
+* [Scala](https://www.scala-lang.org/)
 
 ## Languages Missing Certain Support
 
@@ -48,4 +49,3 @@ For an actual example of an issue or pull request adding the above support, plea
 | Haskell  |                    🚫                    |                       🚫                        |
 |  Julia   |                    🚫                    |                       🚫                        |
 |   Perl   |                    🚫                    |                       🚫                        |
-|  Scala   |                    🚫                    |                       🚫                        |