vscode-front-matter/syntaxes/hugo.tmLanguage.json

{
  "scopeName": "frontmatter.markdown.hugo",
  "injectionSelector": "L:text.html.markdown",
  "patterns": [
    {
      "include": "#shortcodes"
    }
  ],
  "repository": {
    "string-double-quoted": {
			"begin": "\"",
			"beginCaptures": {
				"0": { "name": "punctuation.definition.string.begin.hugo" }
			},
			"end": "\"",
			"endCaptures": {
				"0": { "name": "punctuation.definition.string.end.hugo" }
			},
			"name": "string.quoted.double.hugo",
			"patterns": [
			]
    },
    "unquoted-attribute": {
			"match": "(?<==)(?:[^\\s<>/'\"]|/(?!>))+",
			"name": "string.unquoted.hugo"
		},
    "tag-generic-attribute": {
      "match": "(?<=[^=])\\b([a-zA-Z0-9:-]+)",
      "name": "entity.other.attribute-name.hugo"
    },
    "shortcode-name": {
      "match": "(\\s[\\w\\-\\_]+\\s)",
      "name": "hugo.shortcode.name",
      "captures": {
        "1": { "name": "keyword.other.important.hugo" }
      }
    },
    "shortcodes": {
      "begin": "{{<|{{%",
      "end": ">}}|%}}",
      "beginCaptures": {
        "0": { "name": "punctuation.definition.tag.begin.hugo" }
      },
      "endCaptures": {
        "0": { "name": "punctuation.definition.tag.end.hugo" }
      },
      "patterns": [
        {
          "include": "#shortcode-name"
        },
        {
          "include": "#tag-generic-attribute"
        },
        {
          "include": "#string-double-quoted"
        },
        {
          "include": "#unquoted-attribute"
        }
      ]
    }
  }
}