Highlight Unison code in Markdown code blocks

.vscode/launch.json

@@ -0,0 +1,17 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+      {
+        "args": [
+          "--extensionDevelopmentPath=${workspaceFolder}"
+        ],
+        "name": "Test Extension",
+        "outFiles": [
+          "${workspaceFolder}/out/**/*.js"
+        ],
+        "preLaunchTask": "npm: esbuild",
+        "request": "launch",
+        "type": "extensionHost"
+      }
+    ]
+}

package.json

@@ -45,6 +45,14 @@
                 "language": "unison",
                 "scopeName": "source.u",
                 "path": "./syntaxes/unison.tmLanguage.json"
+            },
+            {
+                "path": "./syntaxes/unison-markdown-injection.tmLanguage.json",
+                "scopeName": "markdown.unison.codeblock",
+                "injectTo": ["text.html.markdown"],
+                "embeddedLanguages": {
+                    "meta.embedded.unison": "unison"
+                }
             }
         ],
         "configuration": {

syntaxes/unison-markdown-injection.tmLanguage.json

@@ -0,0 +1,44 @@
+{
+    "scopeName": "markdown.unison.codeblock",
+    "injectionSelector": "L:text.html.markdown",
+    "patterns": [
+        {
+            "include": "#unison-code-block"
+        }
+    ],
+    "repository": {
+        "unison-code-block": {
+            "begin": "(^|\\G)(\\s*)(\\`{3,}|~{3,})\\s*(?i:(unison)(\\s+[^`~]*)?$)",
+            "name": "markup.fenced.block.markdown",
+            "end": "(^|\\G)(\\2|\\s{0,3})(\\3)\\s*$",
+            "beginCaptures": {
+                "3": {
+                    "name": "punctuation.definition.markdown"
+                },
+                "4": {
+                    "name": "fenced.block.language.markdown"
+                },
+                "5": {
+                    "name": "fenced.block.language.attributes.markdown"
+                }
+            },
+            "endCaptures": {
+                "3": {
+                    "name": "punctuation.definition.markdown"
+                }
+            },
+            "patterns": [
+                {
+                    "begin": "(^|\\G)(\\s*)(.*)",
+                    "while": "(^|\\G)(?!\\s*([`~]{3,})\\s*$)",
+                    "contentName": "meta.embedded.block.unison",
+                    "patterns": [
+                        {
+                            "include": "source.u"
+                        }
+                    ]
+                }
+            ]
+        }
+    }
+}