Add syntax highlighting in fluent-vue custom block

Author: Demivan

package.json

@@ -20,6 +20,14 @@
       "language": "ftl",
       "scopeName": "source.ftl",
       "path": "./syntaxes/ftl.tmLanguage.json"
+    }, {
+      "path": "./syntaxes/vue.injection.json",
+      "scopeName": "meta.embedded.ftl",
+      "injectTo": ["source.vue"],
+      "embeddedLanguages": {
+        "source.ftl": "ftl",
+        "meta.embedded.block.ftl": "ftl"
+      }
     }]
   }
 }

syntaxes/vue.injection.json

@@ -0,0 +1,52 @@
+{
+    "scopeName": "meta.embedded.ftl",
+    "injectionSelector": "L:source.vue",
+    "patterns": [
+        {
+            "begin": "(<)(fluent)\\b[^>]*(\\blocale\\s*=\\s*(['\"]?)\\w+\\b\\4)(>)",
+            "beginCaptures": {
+                "1": {
+                    "name": "punctuation.definition.tag.begin.html.vue"
+                },
+                "2": {
+                    "name": "entity.name.tag.fluent.html.vue"
+                },
+                "3": {
+                    "name": "meta.tag-stuff",
+                    "patterns": [
+                        {
+                            "include": "text.html.basic#attribute"
+                        }
+                    ]
+                },
+                "5": {
+                    "name": "punctuation.definition.tag.end.html.vue"
+                }
+            },
+            "end": "(<\/)((?i:fluent))(>)(?:\\s*\\n)?",
+            "endCaptures": {
+                "1": {
+                    "name": "punctuation.definition.tag.begin.html.vue"
+                },
+                "2": {
+                    "name": "entity.name.tag.fluent.html.vue"
+                },
+                "3": {
+                    "name": "punctuation.definition.tag.end.html.vue"
+                }
+            },
+            "patterns": [
+                {
+                    "begin": "^",
+                    "end": "(?=<\\/)",
+                    "name": "meta.embedded.block.ftl",
+                    "patterns": [
+                        {
+                            "include": "source.ftl"
+                        }
+                    ]
+                }
+            ]
+        }
+    ]
+}