Add QML language support (#4842)

Fixes https://github.com/helix-editor/helix/issues/2771

5 files changed, 126 insertions, 0 deletions

diff --git a/book/src/generated/lang-support.md b/book/src/generated/lang-support.md
index 59b60851..ac955036 100644
--- a/book/src/generated/lang-support.md
+++ b/book/src/generated/lang-support.md
@@ -93,6 +93,7 @@
 | protobuf | ✓ |  | ✓ |  |
 | purescript | ✓ |  |  | `purescript-language-server` |
 | python | ✓ | ✓ | ✓ | `pylsp` |
+| qml | ✓ |  | ✓ | `qmlls` |
 | r | ✓ |  |  | `R` |
 | racket |  |  |  | `racket` |
 | regex | ✓ |  |  |  |
diff --git a/languages.toml b/languages.toml
index 47d77fee..1e7dcbf7 100644
--- a/languages.toml
+++ b/languages.toml
@@ -1980,3 +1980,16 @@ language-server = { command = "bicep-langserver" }
 [[grammar]]
 name = "bicep"
 source = { git = "https://github.com/the-mikedavis/tree-sitter-bicep", rev = "d8e097fcfa143854861ef737161163a09cc2916b" }
+
+[[language]]
+name = "qml"
+scope = "source.qml"
+file-types = ["qml"]
+roots = []
+language-server = { command = "qmlls" }
+indent = { tab-width = 4, unit = "    " }
+grammar = "qmljs"
+
+[[grammar]]
+name = "qmljs"
+source = { git = "https://github.com/yuja/tree-sitter-qmljs", rev = "0b2b25bcaa7d4925d5f0dda16f6a99c588a437f1" }
diff --git a/runtime/queries/qml/highlights.scm b/runtime/queries/qml/highlights.scm
new file mode 100644
index 00000000..11178fcd
--- /dev/null
+++ b/runtime/queries/qml/highlights.scm
@@ -0,0 +1,90 @@
+(comment) @comment
+
+(ui_import
+  source: _ @namespace
+  version: _? @constant
+  alias: _? @namespace)
+
+(ui_pragma
+  name: (identifier) @attribute
+  value: (identifier)? @constant)
+
+(ui_annotation
+  "@" @punctuation
+  type_name: _ @type)
+
+;;; Declarations
+
+(enum_declaration
+  name: (identifier) @type)
+
+(enum_assignment
+  name: (identifier) @constant
+  value: _ @constant)
+
+(enum_body
+  name: (identifier) @constant)
+
+(ui_inline_component
+  name: (identifier) @type)
+
+(ui_object_definition
+  type_name: _ @type)
+
+(ui_object_definition_binding
+  type_name: _ @type
+  name: _ @variable.other.member)
+
+(ui_property
+  type: _ @type
+  name: (identifier) @variable.other.member)
+
+(ui_signal
+  name: (identifier) @function)
+
+(ui_signal_parameter
+  name: (identifier) @variable.parameter
+  type: _ @type)
+
+(ui_signal_parameter
+  type: _ @type
+  name: (identifier) @variable.parameter);;; Properties and bindings
+
+;;; Bindings
+
+(ui_binding
+  name: _ @variable.other.member)
+
+;;; Other
+
+[
+  "("
+  ")"
+  "{"
+  "}"
+] @punctuation.bracket
+
+(ui_list_property_type [
+  "<"
+  ">"
+] @punctuation.bracket)
+
+[
+  ","
+  "."
+  ":"
+] @punctuation.delimiter
+
+[
+  "as"
+  "component"
+  "default"
+  "enum"
+  "import"
+  "on"
+  "pragma"
+  "property"
+  "readonly"
+  "required"
+  "signal"
+] @keyword
diff --git a/runtime/queries/qml/indents.scm b/runtime/queries/qml/indents.scm
new file mode 100644
index 00000000..07492283
--- /dev/null
+++ b/runtime/queries/qml/indents.scm
@@ -0,0 +1,6 @@
+[
+  (enum_body)
+  (ui_object_initializer)
+] @indent
+
+"}" @outdent
diff --git a/runtime/queries/qml/injections.scm b/runtime/queries/qml/injections.scm
new file mode 100644
index 00000000..1ce987d3
--- /dev/null
+++ b/runtime/queries/qml/injections.scm
@@ -0,0 +1,16 @@
+((comment) @injection.content
+  (#set! injection.language "comment"))
+
+([
+    (empty_statement)
+    (expression_statement)
+    (function_declaration)
+    (generator_function_declaration)
+    (statement_block)
+    (switch_statement)
+    (try_statement)
+    (variable_declaration)
+    (with_statement)
+  ] @injection.content
+  (#set! injection.include-children)
+  (#set! injection.language "javascript"))