Generate example YAML configuration with all properties set to their default value.

README.md

@@ -380,8 +380,9 @@ Example:
 }
 ```
 
-See [.markdownlint.jsonc](schema/.markdownlint.jsonc) for an example
-configuration object with all properties set to their default value.
+See [.markdownlint.jsonc](schema/.markdownlint.jsonc) and/or
+[.markdownlint.yaml](schema/.markdownlint.yaml) for an example
+configuration object with all properties set to the default value.
 
 Sets of rules (known as a "style") can be stored separately and loaded
 as [JSON](https://en.wikipedia.org/wiki/JSON).

schema/.markdownlint.yaml

@@ -0,0 +1,225 @@
+# Example markdownlint YAML configuration with all properties set to their default value
+
+# Default state for all rules
+default: true
+
+# Path to configuration file to extend
+extends: null
+
+# MD001/heading-increment/header-increment - Heading levels should only increment by one level at a time
+MD001: true
+
+# MD002/first-heading-h1/first-header-h1 - First heading should be a top-level heading
+MD002:
+  # Heading level
+  level: 1
+
+# MD003/heading-style/header-style - Heading style
+MD003:
+  # Heading style
+  style: "consistent"
+
+# MD004/ul-style - Unordered list style
+MD004:
+  # List style
+  style: "consistent"
+
+# MD005/list-indent - Inconsistent indentation for list items at the same level
+MD005: true
+
+# MD006/ul-start-left - Consider starting bulleted lists at the beginning of the line
+MD006: true
+
+# MD007/ul-indent - Unordered list indentation
+MD007:
+  # Spaces for indent
+  indent: 2
+  # Whether to indent the first level of the list
+  start_indented: false
+
+# MD009/no-trailing-spaces - Trailing spaces
+MD009:
+  # Spaces for line break
+  br_spaces: 2
+  # Allow spaces for empty lines in list items
+  list_item_empty_lines: false
+  # Include unnecessary breaks
+  strict: false
+
+# MD010/no-hard-tabs - Hard tabs
+MD010:
+  # Include code blocks
+  code_blocks: true
+
+# MD011/no-reversed-links - Reversed link syntax
+MD011: true
+
+# MD012/no-multiple-blanks - Multiple consecutive blank lines
+MD012:
+  # Consecutive blank lines
+  maximum: 1
+
+# MD013/line-length - Line length
+MD013:
+  # Number of characters
+  line_length: 80
+  # Number of characters for headings
+  heading_line_length: 80
+  # Number of characters for code blocks
+  code_block_line_length: 80
+  # Include code blocks
+  code_blocks: true
+  # Include tables
+  tables: true
+  # Include headings
+  headings: true
+  # Include headings
+  headers: true
+  # Strict length checking
+  strict: false
+  # Stern length checking
+  stern: false
+
+# MD014/commands-show-output - Dollar signs used before commands without showing output
+MD014: true
+
+# MD018/no-missing-space-atx - No space after hash on atx style heading
+MD018: true
+
+# MD019/no-multiple-space-atx - Multiple spaces after hash on atx style heading
+MD019: true
+
+# MD020/no-missing-space-closed-atx - No space inside hashes on closed atx style heading
+MD020: true
+
+# MD021/no-multiple-space-closed-atx - Multiple spaces inside hashes on closed atx style heading
+MD021: true
+
+# MD022/blanks-around-headings/blanks-around-headers - Headings should be surrounded by blank lines
+MD022:
+  # Blank lines above heading
+  lines_above: 1
+  # Blank lines below heading
+  lines_below: 1
+
+# MD023/heading-start-left/header-start-left - Headings must start at the beginning of the line
+MD023: true
+
+# MD024/no-duplicate-heading/no-duplicate-header - Multiple headings with the same content
+MD024:
+  # Only check sibling headings
+  allow_different_nesting: false
+  # Only check sibling headings
+  siblings_only: false
+
+# MD025/single-title/single-h1 - Multiple top-level headings in the same document
+MD025:
+  # Heading level
+  level: 1
+  # RegExp for matching title in front matter
+  front_matter_title: "^\\s*title\\s*[:=]"
+
+# MD026/no-trailing-punctuation - Trailing punctuation in heading
+MD026:
+  # Punctuation characters
+  punctuation: ".,;:!。，；：！"
+
+# MD027/no-multiple-space-blockquote - Multiple spaces after blockquote symbol
+MD027: true
+
+# MD028/no-blanks-blockquote - Blank line inside blockquote
+MD028: true
+
+# MD029/ol-prefix - Ordered list item prefix
+MD029:
+  # List style
+  style: "one_or_ordered"
+
+# MD030/list-marker-space - Spaces after list markers
+MD030:
+  # Spaces for single-line unordered list items
+  ul_single: 1
+  # Spaces for single-line ordered list items
+  ol_single: 1
+  # Spaces for multi-line unordered list items
+  ul_multi: 1
+  # Spaces for multi-line ordered list items
+  ol_multi: 1
+
+# MD031/blanks-around-fences - Fenced code blocks should be surrounded by blank lines
+MD031:
+  # Include list items
+  list_items: true
+
+# MD032/blanks-around-lists - Lists should be surrounded by blank lines
+MD032: true
+
+# MD033/no-inline-html - Inline HTML
+MD033:
+  # Allowed elements
+  allowed_elements: []
+
+# MD034/no-bare-urls - Bare URL used
+MD034: true
+
+# MD035/hr-style - Horizontal rule style
+MD035:
+  # Horizontal rule style
+  style: "consistent"
+
+# MD036/no-emphasis-as-heading/no-emphasis-as-header - Emphasis used instead of a heading
+MD036:
+  # Punctuation characters
+  punctuation: ".,;:!?。，；：！？"
+
+# MD037/no-space-in-emphasis - Spaces inside emphasis markers
+MD037: true
+
+# MD038/no-space-in-code - Spaces inside code span elements
+MD038: true
+
+# MD039/no-space-in-links - Spaces inside link text
+MD039: true
+
+# MD040/fenced-code-language - Fenced code blocks should have a language specified
+MD040: true
+
+# MD041/first-line-heading/first-line-h1 - First line in a file should be a top-level heading
+MD041:
+  # Heading level
+  level: 1
+  # RegExp for matching title in front matter
+  front_matter_title: "^\\s*title\\s*[:=]"
+
+# MD042/no-empty-links - No empty links
+MD042: true
+
+# MD043/required-headings/required-headers - Required heading structure
+MD043:
+  # List of headings
+  headings: []
+  # List of headings
+  headers: []
+
+# MD044/proper-names - Proper names should have the correct capitalization
+MD044:
+  # List of proper names
+  names: []
+  # Include code blocks
+  code_blocks: true
+
+# MD045/no-alt-text - Images should have alternate text (alt text)
+MD045: true
+
+# MD046/code-block-style - Code block style
+MD046:
+  # Block style
+  style: "consistent"
+
+# MD047/single-trailing-newline - Files should end with a single newline character
+MD047: true
+
+# MD048/code-fence-style - Code fence style
+MD048:
+  # Code fence syle
+  style: "consistent"

schema/build-config-example.js

@@ -25,13 +25,29 @@ for (const rule in configSchema.properties) {
   }
 }
 
-const configString = JSON.stringify(configExample, null, 2)
+const configStringJson = JSON.stringify(configExample, null, 2)
   // eslint-disable-next-line max-len
   .replace(/^\{/, "{\n  // Example markdownlint JSON(C) configuration with all properties set to their default value")
   .replace(/(\s+)"[^-"]+-description": "(.+)",/g, "\n$1// $2")
   .replace(/"[^-"]+-sub-description": "(.+)",/g, "// $1");
 fs.writeFileSync(
   path.join(__dirname, ".markdownlint.jsonc"),
-  configString,
+  configStringJson,
+  "utf8"
+);
+
+const configStringYaml = configStringJson
+  .replace(/JSON\(C\)/, "YAML")
+  .replace(/\n {2}/g, "\n")
+  .replace(/\/\/ /g, "# ")
+  .replace(/(\s*)"([^"]+)":/g, "$1$2:")
+  .replace(/: \{/g, ":")
+  .replace(/\n\}/g, "")
+  .replace(/,\n/g, "\n")
+  .replace(/^\{\n/, "")
+  .replace(/\}$/, "");
+fs.writeFileSync(
+  path.join(__dirname, ".markdownlint.yaml"),
+  configStringYaml,
   "utf8"
 );

test/markdownlint-test.js

@@ -4,6 +4,7 @@
 
 const fs = require("fs");
 const path = require("path");
+const jsYaml = require("js-yaml");
 const md = require("markdown-it")();
 const pluginInline = require("markdown-it-for-inline");
 const pluginSub = require("markdown-it-sub");
@@ -1008,15 +1009,29 @@ test("validateConfigSchemaAllowsUnknownProperties", (t) => {
 });
 
 test("validateConfigExampleJson", (t) => {
-  const file = ".markdownlint.jsonc";
-  const data = fs.readFileSync(
-    path.join(__dirname, "../schema", file),
+  t.plan(2);
+
+  // Validate JSONC
+  const fileJson = ".markdownlint.jsonc";
+  const dataJson = fs.readFileSync(
+    path.join(__dirname, "../schema", fileJson),
     "utf8"
   );
+  const jsonObject = JSON.parse(stripJsonComments(dataJson));
   t.true(
     // @ts-ignore
-    tv4.validate(JSON.parse(stripJsonComments(data)), configSchemaStrict),
-    file + "\n" + JSON.stringify(tv4.error, null, 2));
+    tv4.validate(jsonObject, configSchemaStrict),
+    fileJson + "\n" + JSON.stringify(tv4.error, null, 2));
+
+  // Validate YAML
+  const fileYaml = ".markdownlint.yaml";
+  const dataYaml = fs.readFileSync(
+    path.join(__dirname, "../schema", fileYaml),
+    "utf8"
+  );
+  const yamlObject = jsYaml.safeLoad(dataYaml);
+  t.deepEqual(yamlObject, jsonObject,
+    "YAML example does not match JSON example.");
 });
 
 test.cb("configSingle", (t) => {