Add textobject for gdscript (helix-editor#3760)

Author: erasin

book/src/generated/lang-support.md

@@ -29,7 +29,7 @@
 | esdl | ✓ |  |  |  |
 | fish | ✓ | ✓ | ✓ |  |
 | fortran | ✓ |  | ✓ | `fortls` |
-| gdscript | ✓ |  |  |  |
+| gdscript | ✓ | ✓ |  |  |
 | git-attributes | ✓ |  |  |  |
 | git-commit | ✓ |  |  |  |
 | git-config | ✓ |  |  |  |

languages.toml

@@ -1327,7 +1327,7 @@ shebangs = []
 roots = ["project.godot"]
 auto-format = true
 comment-token = "#"
-indent = { tab-width = 4, unit = "    " }
+indent = { tab-width = 4, unit = "\t" }
 
 [[grammar]]
 name = "gdscript"

runtime/queries/gdscript/highlights.scm

@@ -3,6 +3,11 @@
 ((identifier) @constant
  (#match? @constant "^[A-Z][A-Z_]*$"))
 
+; class
+(class_name_statement (name) @type)
+(class_definition (name) @type)
+
+
 ; Function calls
 
 (attribute_call (identifier) @function)

runtime/queries/gdscript/textobjects.scm

@@ -0,0 +1,17 @@
+
+(class_definition
+  (body) @class.inside) @class.around
+
+(function_definition
+  (body) @function.inside) @function.around
+
+(parameters 
+  [
+    (identifier)
+    (typed_parameter)
+    (default_parameter)    
+    (typed_default_parameter)  
+  ] @parameter.inside @parameter.around)
+
+(comment) @comment.inside
+(comment)+ @comment.around