Add syntax highlighting

dependency.ro

@@ -0,0 +1,6 @@
+pub fn print_two_numbers(a: int, b: int) {
+	a = a + 1;
+	b = b * 2;
+
+	printf("%i %i", a, b);
+}

input.ro

@@ -0,0 +1,4 @@
+let a = 1 + 2;
+let b = c + 3 * 4;
+
+print_two_numbers(a, b);

lsp-client/client/src/extension.ts

@@ -25,7 +25,10 @@ export function activate(context: ExtensionContext) {
   // Options to control the language client
   const clientOptions: LanguageClientOptions = {
     // Register the server for plain text documents
-    documentSelector: [{ language: "plaintext" }],
+    documentSelector: [{
+      scheme: "file",
+      language: "rost",
+    }],
     // synchronize: {
     //   // Notify the server about file changes to '.clientrc files contained in the workspace
     //   fileEvents: workspace.createFileSystemWatcher("**/.clientrc"),

lsp-client/package.json

@@ -16,11 +16,30 @@
   "engines": {
     "vscode": "^1.75.0"
   },
+  "main": "./client/out/extension",
   "activationEvents": [
-    "onLanguage:plaintext"
+    "onLanguage:rost"
   ],
-  "main": "./client/out/extension",
   "contributes": {
+    "languages": [
+      {
+        "id": "rost",
+        "aliases": [
+          "Rost",
+          "rost"
+        ],
+        "extensions": [
+          ".ro"
+        ]
+      }
+    ],
+    "grammars": [
+      {
+        "language": "rost",
+        "scopeName": "source.rost",
+        "path": "./syntaxes/rost.tmLanguage.json"
+      }
+    ],
     "configuration": {
       "type": "object",
       "title": "Example configuration",

lsp-client/syntaxes/rost.tmLanguage.json

@@ -0,0 +1,82 @@
+{
+	"scopeName": "source.rost",
+	"patterns": [
+		{
+			"name": "meta.function-call.rost",
+			"match": "(\\b[a-zA-Z_][a-zA-Z0-9_]*\\b)\\s*\\(",
+			"captures": {
+				"1": {
+					"name": "support.function.builtin.rost"
+				}
+			}
+		},
+		{
+			"name": "comment.block.rost",
+			"begin": "/\\*",
+			"end": "\\*/"
+		},
+		{
+			"name": "comment.line.rost",
+			"begin": "/\\*",
+			"end": "\\*/"
+		},
+		{
+			"name": "comment.line.double-slash.rost",
+			"match": "//.*$"
+		},
+		{
+			"name": "keyword.control.rost",
+			"match": "\\b(pub|let|fn|if|else|for|while|return)\\b"
+		},
+		{
+			"name": "string.quoted.double.rost",
+			"begin": "\"",
+			"end": "\""
+		},
+		{
+			"name": "constant.numeric.rost",
+			"match": "\\b\\d+\\b"
+		},
+		{
+			"name": "variable.other.rost",
+			"match": "\\b[a-zA-Z_][a-zA-Z0-9_]*\\b"
+		},
+		{
+			"name": "punctuation.terminator.rost",
+			"match": ";"
+		},
+		{
+			"name": "punctuation.separator.rost",
+			"match": ","
+		},
+		{
+			"name": "punctuation.bracket.rost",
+			"match": "[\\[\\]\\(\\)\\{\\}]"
+		},
+		{
+			"name": "operator.arithmetic.rost",
+			"match": "[\\+\\-\\*\\/\\%]"
+		},
+		{
+			"name": "operator.comparison.rost",
+			"match": "[\\=\\!\\<\\>]"
+		},
+		{
+			"name": "operator.assignment.rost",
+			"match": "="
+		},
+		{
+			"name": "storage.type.rost",
+			"match": "\\b(int|float|double|char|void)\\b"
+		},
+		{
+			"name": "storage.class.rost",
+			"match": "\\b(struct|enum)\\b"
+		}
+	],
+	"repository": {},
+	"name": "Rost",
+	"fileTypes": [
+		".ro"
+	]
+}