Add markdown code block syntax highlight support (#97)

* syntax highlight in markdown code block
* changelog

Author: wangbinyq

CHANGELOG.md

@@ -16,6 +16,7 @@
 
 - Inlay Hints (experimetal). `rescript.settings.inlayHints.enable: true`. Turned off by default.
 - Code Lenses for functions (experimetal). `rescript.settings.codeLens: true`. Turned off by default.
+- Markdown code blocks tagged as `rescript` now get basic syntax highlighting.
 
 ## v1.4.2
 

grammars/rescript.markdown.json

@@ -0,0 +1,45 @@
+{
+  "fileTypes": [],
+  "injectionSelector": "L:text.html.markdown",
+  "patterns": [
+    {
+      "include": "#rescript-code-block"
+    }
+  ],
+  "repository": {
+    "rescript-code-block": {
+      "name": "markup.fenced_code.block.markdown",
+      "begin": "(^|\\G)(\\s*)(\\`{3,}|~{3,})\\s*(?i:(res|rescript)(\\s+[^`~]*)?$)",
+      "end": "(^|\\G)(\\2|\\s{0,3})(\\3)\\s*$",
+      "beginCaptures": {
+        "3": {
+          "name": "punctuation.definition.markdown"
+        },
+        "5": {
+          "name": "fenced_code.block.language"
+        },
+        "6": {
+          "name": "fenced_code.block.language.attributes"
+        }
+      },
+      "endCaptures": {
+        "3": {
+          "name": "punctuation.definition.markdown"
+        }
+      },
+      "patterns": [
+        {
+          "begin": "(^|\\G)(\\s*)(.*)",
+          "while": "(^|\\G)(?!\\s*([`~]{3,})\\s*$)",
+          "contentName": "meta.embedded.block.rescript",
+          "patterns": [
+            {
+              "include": "source.rescript"
+            }
+          ]
+        }
+      ]
+    }
+  },
+  "scopeName": "markdown.rescript.codeblock"
+}

package.json

@@ -163,6 +163,16 @@
 				"language": "rescript",
 				"scopeName": "source.rescript",
 				"path": "./grammars/rescript.tmLanguage.json"
+			},
+			{
+				"scopeName": "markdown.rescript.codeblock",
+				"path": "./grammars/rescript.markdown.json",
+				"injectTo": [
+					"text.html.markdown"
+				],
+				"embeddedLanguages": {
+					"meta.embedded.block.rescript": "rescript"
+				}
 			}
 		],
 		"languages": [
@@ -191,4 +201,4 @@
 		"@types/vscode": "1.68.0",
 		"typescript": "^4.7.3"
 	}
-}
+}