feat: add protobuf language support

.gitmodules

@@ -98,3 +98,7 @@
 	path = helix-syntax/languages/tree-sitter-ledger
 	url = https://github.com/cbarrete/tree-sitter-ledger
 	shallow = true
+[submodule "helix-syntax/languages/tree-sitter-protobuf"]
+	path = helix-syntax/languages/tree-sitter-protobuf
+	url = https://github.com/yusdacra/tree-sitter-protobuf.git
+	shallow = true

languages.toml

@@ -30,6 +30,16 @@ comment-token = "#"
 
 indent = { tab-width = 2, unit = "  " }
 
+[[language]]
+name = "protobuf"
+scope = "source.proto"
+injection-regex = "protobuf"
+file-types = ["proto"]
+roots = []
+comment-token = "//"
+
+indent = { tab-width = 2, unit = "  " }
+
 [[language]]
 name = "elixir"
 scope = "source.elixir"

runtime/queries/protobuf/highlights.scm

@@ -0,0 +1,60 @@
+[
+  "syntax"
+  "package"
+  "option"
+  "import"
+  "service"
+  "rpc"
+  "returns"
+  "message"
+  "enum"
+  "oneof"
+  "repeated"
+  "reserved"
+  "to"
+  "stream"
+  "extend"
+] @keyword
+
+[
+  (keyType)
+  (type)
+] @type.builtin
+
+[
+  (mapName)
+  (oneofName)
+  (enumName)
+  (messageName)
+  (extendName)
+  (serviceName)
+  (rpcName)
+] @type
+
+[
+  (fieldName)
+  (optionName)
+] @property
+(enumVariantName) @type.enum.variant
+
+(fullIdent) @namespace
+
+[
+  (intLit)
+  (floatLit)
+] @number
+(boolLit) @constant.builtin
+(strLit) @string
+
+(constant) @constant
+
+(comment) @comment
+
+[
+  "("
+  ")"
+  "["
+  "]"
+  "{"
+  "}"
+]  @punctuation.bracket

runtime/queries/protobuf/indents.toml

@@ -0,0 +1,12 @@
+indent = [
+  "messageBody",
+  "enumBody",
+  "oneofBody",
+  "serviceBody",
+  "rpcBody",
+  "msgLit",
+]
+
+outdent = [
+  "}",
+]