parsers: add nickel parser (#3506)

* parsers: add nickel parser

* Update lua/nvim-treesitter/parsers.lua

Co-authored-by: Christian Clason <christian.clason@uni-due.de>

* Update queries/nickel/highlights.scm

Co-authored-by: Christian Clason <christian.clason@uni-due.de>

* fix queries

* Cleanup (based on @theHamsta review)

Co-authored-by: Christian Clason <christian.clason@uni-due.de>

lua/nvim-treesitter/parsers.lua

@@ -1211,6 +1211,14 @@ list.gitignore = {
   maintainers = { "@theHamsta" },
 }
 
+list.nickel = {
+  install_info = {
+    url = "https://github.com/nickel-lang/tree-sitter-nickel",
+    files = { "src/parser.c", "src/scanner.cc" },
+    branch = "main",
+  },
+}
+
 list.gitattributes = {
   install_info = {
     url = "https://github.com/ObserverOfTime/tree-sitter-gitattributes",

queries/nickel/highlights.scm

@@ -0,0 +1,61 @@
+(comment) @comment @spell
+
+[
+  "forall"
+  "in"
+  "let"
+  "default"
+  "doc"
+  "rec"
+] @keyword
+
+"fun" @keyword.function
+
+"import" @include
+
+[ "if" "then" "else" ] @conditional
+"switch" @conditional
+
+(types) @type
+"Array" @type.builtin
+
+; BUILTIN Constants
+(bool) @constant.builtin
+"null" @constant.builtin
+
+(num_literal) @number
+
+(infix_op) @operator
+
+(type_atom) @type
+(enum_tag) @variable
+
+(chunk_literal_single) @string
+(chunk_literal_multi) @string
+
+(str_esc_char) @string.escape
+
+[
+ "{" "}"
+ "(" ")"
+ "[|" "|]"
+] @punctuation.bracket
+
+(multstr_start) @punctuation.bracket
+(multstr_end) @punctuation.bracket
+(interpolation_start) @punctuation.bracket
+(interpolation_end) @punctuation.bracket
+
+(record_field) @field
+
+(builtin) @function.builtin
+
+(fun_expr pats:
+  (pattern id:
+    (ident) @parameter
+  )
+)
+
+(applicative t1:
+  (applicative (record_operand) @function)
+)