syntax: Add go & rust locals, improve tree-sitter error message

helix-core/src/syntax.rs

@@ -144,8 +144,12 @@ impl LanguageConfiguration {
                 &highlights_query,
                 &injections_query,
                 &locals_query,
-            )
+            );
-            .unwrap(); // TODO: no unwrap
+
+            let config = match config {
+                Ok(config) => config,
+                Err(err) => panic!("{}", err),
+            }; // TODO: avoid panic
             config.configure(scopes);
             Some(Arc::new(config))
         }

runtime/queries/go/highlights.scm

@@ -21,14 +21,14 @@
 (const_spec
   name: (identifier) @constant)
 
+(parameter_declaration (identifier) @variable.parameter)
+(variadic_parameter_declaration (identifier) @variable.parameter)
+
 (type_identifier) @type
 (field_identifier) @property
 (identifier) @variable
 (package_identifier) @variable
 
-(parameter_declaration (identifier) @variable.parameter)
-(variadic_parameter_declaration (identifier) @variable.parameter)
-
 
 ; Operators
 

runtime/queries/go/locals.scm

@@ -0,0 +1,30 @@
+; Scopes
+
+(block) @local.scope
+
+; Definitions
+
+(parameter_declaration (identifier) @local.definition)
+(variadic_parameter_declaration (identifier) @local.definition)
+
+(short_var_declaration
+  left: (expression_list
+          (identifier) @local.definition))
+
+(var_spec
+  name: (identifier) @local.definition)
+
+(for_statement
+ (range_clause
+   left: (expression_list
+           (identifier) @local.definition)))
+
+(const_declaration
+ (const_spec
+  name: (identifier) @local.definition))
+
+; References
+
+(identifier) @local.reference
+(field_identifier) @local.reference
+

runtime/queries/rust/locals.scm

@@ -0,0 +1,17 @@
+; Scopes
+
+(block) @local.scope
+
+; Definitions
+
+(parameter
+  (identifier) @local.definition)
+
+(let_declaration
+  pattern: (identifier) @local.definition)
+
+(closure_parameters (identifier)) @local.definition
+
+; References
+(identifier) @local.reference
+

theme.toml

@@ -9,7 +9,7 @@ special = "honey"
 property = "white"
 variable = "lavender"
 # variable = "almond" # TODO: metavariables only
-"variable.parameter" = "lavender"
+"variable.parameter" = { fg = "lavender", modifiers = ["underlined"] }
 "variable.builtin" = "mint"
 type = "white"
 "type.builtin" = "white" # TODO: distinguish?