feat(languages): GraphQL (#1515)

* Add Graphql language support

* Fix docs gen

* Add JS Graphql injection query

* Updates based on PR feedback

Co-authored-by: Blaž Hrastnik <blaz@mxxn.io>

6 files changed, 184 insertions, 0 deletions

diff --git a/.gitmodules b/.gitmodules
index 118fa2d8..780d1b63 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -206,6 +206,10 @@
 	path = helix-syntax/languages/tree-sitter-git-config
 	url = https://github.com/the-mikedavis/tree-sitter-git-config.git
 	shallow = true
+[submodule "helix-syntax/languages/tree-sitter-graphql"]
+	path = helix-syntax/languages/tree-sitter-graphql
+	url = https://github.com/bkegley/tree-sitter-graphql
+  shallow = true
 [submodule "helix-syntax/languages/tree-sitter-elm"]
 	path = helix-syntax/languages/tree-sitter-elm
 	url = https://github.com/elm-tooling/tree-sitter-elm
diff --git a/book/src/generated/lang-support.md b/book/src/generated/lang-support.md
index bfaac97b..fa8aa3ef 100644
--- a/book/src/generated/lang-support.md
+++ b/book/src/generated/lang-support.md
@@ -18,6 +18,7 @@
 | git-rebase | ✓ |  |  |  |
 | glsl | ✓ |  | ✓ |  |
 | go | ✓ | ✓ | ✓ | `gopls` |
+| graphql | ✓ |  |  |  |
 | haskell | ✓ |  |  |  |
 | html | ✓ |  |  |  |
 | java | ✓ |  |  |  |
diff --git a/helix-syntax/languages/tree-sitter-graphql b/helix-syntax/languages/tree-sitter-graphql
new file mode 160000
+Subproject 5e66e961eee421786bdda8495ed1db045e06b5f
diff --git a/languages.toml b/languages.toml
index ea93df3a..f9362eac 100644
--- a/languages.toml
+++ b/languages.toml
@@ -569,6 +569,14 @@ comment-token = "#"
 indent = { tab-width = 4, unit = "\t" }
 
 [[language]]
+name = "graphql"
+scope = "source.graphql"
+injection-regex = "graphql"
+file-types = ["gql", "graphql"]
+roots = []
+indent = { tab-width = 2, unit = "  " }
+
+[[language]]
 name = "elm"
 scope = "source.elm"
 injection-regex = "elm"
diff --git a/runtime/queries/graphql/highlights.scm b/runtime/queries/graphql/highlights.scm
new file mode 100644
index 00000000..9fab4051
--- /dev/null
+++ b/runtime/queries/graphql/highlights.scm
@@ -0,0 +1,163 @@
+; Types
+;------
+
+(scalar_type_definition
+  (name) @type)
+
+(object_type_definition
+  (name) @type)
+
+(interface_type_definition
+  (name) @type)
+
+(union_type_definition
+  (name) @type)
+
+(enum_type_definition
+  (name) @type)
+
+(input_object_type_definition
+  (name) @type)
+
+(directive_definition
+  (name) @type)
+
+(directive_definition
+  "@" @type)
+
+(scalar_type_extension
+  (name) @type)
+
+(object_type_extension
+  (name) @type)
+
+(interface_type_extension
+  (name) @type)
+
+(union_type_extension
+  (name) @type)
+
+(enum_type_extension
+  (name) @type)
+
+(input_object_type_extension
+  (name) @type)
+
+(named_type
+  (name) @type)
+
+(directive) @type
+
+; Properties
+;-----------
+
+(field
+  (name) @variable.other.member)
+
+(field
+  (alias
+    (name) @variable.other.member))
+
+(field_definition
+  (name) @variable.other.member)
+
+(object_value
+  (object_field
+    (name) @variable.other.member))
+
+(enum_value
+  (name) @variable.other.member)
+
+; Variable Definitions and Arguments 
+;-----------------------------------
+
+(operation_definition
+  (name) @variable)
+
+(fragment_name
+  (name) @variable)
+
+(input_fields_definition
+  (input_value_definition
+    (name) @variable.parameter))
+
+(argument
+  (name) @variable.parameter)
+
+(arguments_definition
+  (input_value_definition
+    (name) @variable.parameter))
+
+(variable_definition
+  (variable) @variable.parameter)
+
+(argument
+  (value
+    (variable) @variable))
+
+; Constants
+;----------
+
+(string_value) @string
+
+(int_value) @constants.numeric.integer
+
+(float_value) @constants.numeric.float
+
+(boolean_value) @constants.builtin.boolean
+
+; Literals
+;---------
+
+(description) @comment
+
+(comment) @comment
+
+(directive_location
+  (executable_directive_location) @type.builtin)
+
+(directive_location
+  (type_system_directive_location) @type.builtin)
+
+; Keywords
+;----------
+
+[
+  "query"
+  "mutation"
+  "subscription"
+  "fragment"
+  "scalar"
+  "type"
+  "interface"
+  "union"
+  "enum"
+  "input"
+  "extend"
+  "directive"
+  "schema"
+  "on"
+  "repeatable"
+  "implements"
+] @keyword
+
+; Punctuation
+;------------
+
+[
+ "("
+ ")"
+ "["
+ "]"
+ "{"
+ "}"
+] @punctuation.bracket
+
+"=" @operator
+
+"|" @punctuation.delimiter
+"&" @punctuation.delimiter
+":" @punctuation.delimiter
+
+"..." @punctuation.special
+"!" @punctuation.special
diff --git a/runtime/queries/javascript/injections.scm b/runtime/queries/javascript/injections.scm
index 5539241a..e8429111 100644
--- a/runtime/queries/javascript/injections.scm
+++ b/runtime/queries/javascript/injections.scm
@@ -9,6 +9,14 @@
   ]
   arguments: (template_string) @injection.content)
 
+; Parse the contents of gql template literals
+
+((call_expression
+   function: (identifier) @_template_function_name
+   arguments: (template_string) @injection.content)
+ (#eq? @_template_function_name "gql")
+ (#set! injection.language "graphql"))
+
 ; Parse regex syntax within regex literals
 
 ((regex_pattern) @injection.content