Add multi-format frontmatter parser

example/index.html

@@ -11,7 +11,13 @@
   window.repoFiles = {
     _posts: {
       "2015-02-14-this-is-a-post.md": {
-        content: "---\ntitle: This is a post\nimage: /nf-logo.png\ndate: 2015-02-14T00:00:00.000Z\n---\n\n# I Am a Title in Markdown\n\nHello, world\n\n* One Thing\n* Another Thing\n* A Third Thing\n"
+        content: "---\ntitle: This is a YAML front matter post\nimage: /nf-logo.png\ndate: 2015-02-14T00:00:00.000Z\n---\n\n# I Am a Title in Markdown\n\nHello, world\n\n* One Thing\n* Another Thing\n* A Third Thing\n"
+      },
+      "2015-02-15-this-is-a-json-frontmatter-post.md": {
+        content: "{\n\"title\": \"This is a JSON front matter post\",\n\"image\": \"/nf-logo.png\",\n\"date\": \"2015-02-15T00:00:00.000Z\"\n}\n\n# I Am a Title in Markdown\n\nHello, world\n\n* One Thing\n* Another Thing\n* A Third Thing\n"
+      },
+      "2015-02-16-this-is-a-toml-frontmatter-post.md": {
+        content: "+++\ntitle = \"This is a TOML front matter post\"\nimage = \"/nf-logo.png\"\n\"date\" = \"2015-02-16T00:00:00.000Z\"\n+++\n\n# I Am a Title in Markdown\n\nHello, world\n\n* One Thing\n* Another Thing\n* A Third Thing\n"
       }
     },
     _faqs: {

package.json

@@ -113,6 +113,9 @@
     "netlify-auth-js": "^0.5.5",
     "normalize.css": "^4.2.0",
     "pluralize": "^3.0.0",
+    "preliminaries": "^1.0.0",
+    "preliminaries-parser-toml": "1.0.1",
+    "preliminaries-parser-yaml": "^1.0.0",
     "prismjs": "^1.5.1",
     "prosemirror-commands": "^0.16.0",
     "prosemirror-history": "^0.16.0",

src/formats/__tests__/yaml-frontmatter.spec.js

@@ -0,0 +1,105 @@
+import YAMLFrontmatter from '../yaml-frontmatter';
+
+const YamlFrontmatterFormatter = new YAMLFrontmatter();
+
+describe('YAMLFrontmatter', () => {
+  it('should parse YAML with --- delimiters', () => {
+    expect(
+      YamlFrontmatterFormatter.fromFile('---\ntitle: YAML\ndescription: Something longer\n---\nContent')
+    ).toEqual(
+      {
+        title: 'YAML',
+        description: 'Something longer',
+        body: 'Content',
+      }
+    );
+  });
+
+  it('should parse YAML with ---yaml delimiters', () => {
+    expect(
+      YamlFrontmatterFormatter.fromFile('---yaml\ntitle: YAML\ndescription: Something longer\n---\nContent')
+    ).toEqual(
+      {
+        title: 'YAML',
+        description: 'Something longer',
+        body: 'Content',
+      }
+    );
+  });
+
+  it('should overwrite any body param in the front matter', () => {
+    expect(
+      YamlFrontmatterFormatter.fromFile('---\ntitle: The Title\nbody: Something longer\n---\nContent')
+    ).toEqual(
+      {
+        title: 'The Title',
+        body: 'Content',
+      }
+    );
+  });
+
+  it('should parse TOML with +++ delimiters', () => {
+    expect(
+      YamlFrontmatterFormatter.fromFile('+++\ntitle = "TOML"\ndescription = "Front matter"\n+++\nContent')
+    ).toEqual(
+      {
+        title: 'TOML',
+        description: 'Front matter',
+        body: 'Content',
+      }
+    );
+  });
+
+  it('should parse TOML with ---toml delimiters', () => {
+    expect(
+      YamlFrontmatterFormatter.fromFile('---toml\ntitle = "TOML"\ndescription = "Something longer"\n---\nContent')
+    ).toEqual(
+      {
+        title: 'TOML',
+        description: 'Something longer',
+        body: 'Content',
+      }
+    );
+  });
+
+  it('should parse JSON with { } delimiters', () => {
+    expect(
+      YamlFrontmatterFormatter.fromFile('{\n"title": "The Title",\n"description": "Something longer"\n}\nContent')
+    ).toEqual(
+      {
+        title: 'The Title',
+        description: 'Something longer',
+        body: 'Content',
+      }
+    );
+  });
+
+  it('should parse JSON with ---json delimiters', () => {
+    expect(
+      YamlFrontmatterFormatter.fromFile('---json\n{\n"title": "The Title",\n"description": "Something longer"\n}\n---\nContent')
+    ).toEqual(
+      {
+        title: 'The Title',
+        description: 'Something longer',
+        body: 'Content',
+      }
+    );
+  });
+
+  it('should stringify YAML with --- delimiters', () => {
+    expect(
+      YamlFrontmatterFormatter.toFile({ body: 'Some content\nOn another line', tags: ['front matter', 'yaml'], title: 'YAML' })
+    ).toEqual(
+      [
+        '---',
+        'tags:',
+        '  - front matter',
+        '  - yaml',
+        'title: YAML',
+        '---',
+        'Some content',
+        'On another line\n',
+      ].join('\n')
+    );
+  });
+});

src/formats/yaml-frontmatter.js

@@ -1,31 +1,31 @@
-import YAML from './yaml';
+import preliminaries from 'preliminaries';
+import yamlParser from 'preliminaries-parser-yaml';
+import tomlParser from 'preliminaries-parser-toml';
 
-const regexp = /^---\n([^]*?)\n---\n([^]*)$/;
+// Automatically register parsers
+preliminaries(true);
+yamlParser(true);
+tomlParser(true);
 
 export default class YAMLFrontmatter {
   fromFile(content) {
-    const match = content.match(regexp);
+    const result = preliminaries.parse(content);
-    const obj = match ? new YAML().fromFile(match[1]) : {};
+    const data = result.data;
-    obj.body = match ? (match[2] || '').replace(/^\n+/, '') : content;
+    data.body = result.content;
-    return obj;
+    return data;
   }
 
   toFile(data, sortedKeys) {
     const meta = {};
     let body = '';
-    let content = '';
+    Object.keys(data).forEach((key) => {
-    for (var key in data) {
       if (key === 'body') {
         body = data[key];
       } else {
         meta[key] = data[key];
       }
-    }
+    });
-
+    // always stringify to YAML
-    content += '---\n';
+    return preliminaries.stringify(body, meta, { lang: 'yaml', delims: '---' });
-    content += new YAML().toFile(meta, sortedKeys);
-    content += '---\n\n';
-    content += body;
-    return content;
   }
 }

yarn.lock

@@ -2773,6 +2773,10 @@ esprima@2.7.x, esprima@^2.6.0, esprima@^2.7.1:
   version "2.7.3"
   resolved "https://registry.yarnpkg.com/esprima/-/esprima-2.7.3.tgz#96e3b70d5779f6ad49cd032673d1c312767ba581"
 
+esprima@^3.1.1:
+  version "3.1.3"
+  resolved "https://registry.yarnpkg.com/esprima/-/esprima-3.1.3.tgz#fdca51cee6133895e3c88d535ce49dbff62a4633"
+
 esprima@~3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/esprima/-/esprima-3.0.0.tgz#53cf247acda77313e551c3aa2e73342d3fb4f7d9"
@@ -2936,6 +2940,12 @@ express@^4.13.3:
     utils-merge "1.0.0"
     vary "~1.1.0"
 
+extend-shallow@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/extend-shallow/-/extend-shallow-2.0.1.tgz#51af7d614ad9a9f610ea1bafbb989d6b1c56890f"
+  dependencies:
+    is-extendable "^0.1.0"
+
 extend@^3.0.0, extend@~3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/extend/-/extend-3.0.0.tgz#5a474353b9f3353ddd8176dfd37b91c83a46f1d4"
@@ -3870,7 +3880,7 @@ is-es2016-keyword@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-es2016-keyword/-/is-es2016-keyword-1.0.0.tgz#f6e54e110c5e4f8d265e69d2ed0eaf8cf5f47718"
 
-is-extendable@^0.1.1:
+is-extendable@^0.1.0, is-extendable@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/is-extendable/-/is-extendable-0.1.1.tgz#62b110e289a471418e3ec36a617d472e301dfc89"
 
@@ -4555,7 +4565,14 @@ js-tokens@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-2.0.0.tgz#79903f5563ee778cc1162e6dcf1a0027c97f9cb5"
 
-js-yaml@3.x, js-yaml@^3.4.2, js-yaml@^3.4.3, js-yaml@^3.5.1, js-yaml@^3.7.0:
+js-yaml@3.x, js-yaml@^3.4.2, js-yaml@^3.4.3, js-yaml@^3.5.1, js-yaml@^3.8.1:
+  version "3.8.3"
+  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.8.3.tgz#33a05ec481c850c8875929166fe1beb61c728766"
+  dependencies:
+    argparse "^1.0.7"
+    esprima "^3.1.1"
+
+js-yaml@^3.7.0:
   version "3.7.0"
   resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.7.0.tgz#5c967ddd837a9bfdca5f2de84253abe8a1c03b80"
   dependencies:
@@ -6779,6 +6796,26 @@ pre-commit@^1.1.3:
     spawn-sync "^1.0.15"
     which "1.2.x"
 
+preliminaries-parser-toml@1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/preliminaries-parser-toml/-/preliminaries-parser-toml-1.0.1.tgz#009cadc4d801428a05eada48d8ec438a3f690a5f"
+  dependencies:
+    toml "^2.3.2"
+    toml-js "0.0.8"
+
+preliminaries-parser-yaml@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/preliminaries-parser-yaml/-/preliminaries-parser-yaml-1.0.0.tgz#80da4ed54278fdf2f1e9ce379ab6cdce15cd7b54"
+  dependencies:
+    extend-shallow "^2.0.1"
+    js-yaml "^3.8.1"
+
+preliminaries@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/preliminaries/-/preliminaries-1.0.0.tgz#973aead5fbc2c8371bcba7de4413c3e8afe16cc1"
+  dependencies:
+    extend-shallow "^2.0.1"
+
 prelude-ls@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
@@ -8556,6 +8593,14 @@ to-fast-properties@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/to-fast-properties/-/to-fast-properties-1.0.2.tgz#f3f5c0c3ba7299a7ef99427e44633257ade43320"
 
+toml-js@0.0.8:
+  version "0.0.8"
+  resolved "https://registry.yarnpkg.com/toml-js/-/toml-js-0.0.8.tgz#648ea6f1a4d63b19c0bb30b8ed03e40d09473b0a"
+
+toml@^2.3.2:
+  version "2.3.2"
+  resolved "https://registry.yarnpkg.com/toml/-/toml-2.3.2.tgz#5eded5ca42887924949fd06eb0e955656001e834"
+
 topbar@^0.1.3:
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/topbar/-/topbar-0.1.3.tgz#c9ef8776dc4469f7840e6416f4136ddeccf4b7c6"