feat(lang): Update Nix grammar & improve queries

Update grammar and queiries to the latest upstream. Also add improved
indents thanks to @oxalica.

languages.toml

@@ -439,7 +439,7 @@ indent = { tab-width = 2, unit = "  " }
 
 [[grammar]]
 name = "nix"
-source = { git = "https://github.com/cstrahan/tree-sitter-nix", rev = "50f38ceab667f9d482640edfee803d74f4edeba5" }
+source = { git = "https://github.com/cstrahan/tree-sitter-nix", rev = "470b15a60520ff7b86f51732b8d8f1118c86041e" }
 
 [[language]]
 name = "ruby"

runtime/queries/nix/highlights.scm

@@ -1,15 +1,16 @@
 (comment) @comment
 
 [
-  "if"
+  "if" 
   "then"
   "else"
   "let"
   "inherit"
   "in"
   "rec"
-  "with"
+  "with" 
   "assert"
+  "or"
 ] @keyword
 
 ((identifier) @variable.builtin
@@ -21,61 +22,66 @@
  (#is-not? local))
 
 [
-  (string)
-  (indented_string)
+  (string_expression)
+  (indented_string_expression)
 ] @string
 
 [
-  (path)
-  (hpath)
-  (spath)
+  (path_expression)
+  (hpath_expression)
+  (spath_expression)
 ] @string.special.path
 
-(uri) @string.special.uri
+(uri_expression) @string.special.uri
 
 ; boolean
 ((identifier) @constant.builtin.boolean (#match? @constant.builtin.boolean "^(true|false)$")) @constant.builtin.boolean
 ; null
 ((identifier) @constant.builtin (#eq? @constant.builtin "null")) @constant.builtin
 
-(integer) @constant.numeric.integer
-(float) @constant.numeric.float
+(integer_expression) @constant.numeric.integer
+(float_expression) @constant.numeric.float
 
 (interpolation
   "${" @punctuation.special
   "}" @punctuation.special) @embedded
 
 (escape_sequence) @constant.character.escape
 
-(function
+(function_expression
   universal: (identifier) @variable.parameter
 )
 
 (formal
   name: (identifier) @variable.parameter
   "?"? @punctuation.delimiter)
 
-(app
+(select_expression
+  attrpath: (attrpath (identifier)) @variable.other.member)
+
+(apply_expression
   function: [
-    (identifier) @function
-    (select
+    (variable_expression (identifier)) @function
+    (select_expression
       attrpath: (attrpath
-        attr: (attr_identifier) @function .))])
-
+        attr: (identifier) @function .))])
 
-(unary
+(unary_expression
   operator: _ @operator)
 
-(binary
+(binary_expression
   operator: _ @operator)
 
-(attr_identifier) @variable.other.member
-(inherit attrs: (attrs_inherited (identifier) @variable.other.member) )
+(binding
+  attrpath: (attrpath (identifier)) @variable.other.member)
+
+(identifier) @variable.other.member
 
 [
   ";"
   "."
   ","
+  "="
 ] @punctuation.delimiter
 
 [

runtime/queries/nix/indents.scm

@@ -1,18 +1,25 @@
+
 [
-  ; "function",
-  (bind)
-  (assert)
-  (with)
+  ; Bracket like
   (let)
-  (if)
-
   (attrset)
-  (list)
-  (indented_string)
+  (rec_attrset)
+  (let_attrset)
   (parenthesized)
-] @indent
+  (list)
 
-[
-  "}"
-  "]"
-] @outdent
+  ; Binding
+  (bind)
+  (inherit)
+  (inherit_from)
+  (formal)
+
+  ; Binary operations
+  (binary)
+  (has_attr)
+  (select)
+  (app)
+
+  ; Conditional
+  (if)
+] @indent