Add option --init-rule-docs

README.md

@@ -124,6 +124,7 @@ There's also an optional path argument if you need to point the CLI to an ESLint
 | `--config-emoji` | Custom emoji to use for a config. Format is `config-name,emoji`. Default emojis are provided for [common configs](./lib/emojis.ts). To remove a default emoji and rely on a [badge](#badge) instead, provide the config name without an emoji. Option can be repeated. |
 | `--ignore-config` | Config to ignore from being displayed. Often used for an `all` config. Option can be repeated. |
 | `--ignore-deprecated-rules` | Whether to ignore deprecated rules from being checked, displayed, or updated (default: `false`). |
+| `--init-rule-docs` | Whether to create rule doc files if they don't yet exist (default: `false`). |
 | `--path-rule-doc` | Path to markdown file for each rule doc. Use `{name}` placeholder for the rule name (default: `docs/rules/{name}.md`). |
 | `--path-rule-list` | Path to markdown file with a rules section where the rules table list should live (default: `README.md`). |
 | `--rule-doc-notices` | Ordered, comma-separated list of notices to display in rule doc. Non-applicable notices will be hidden. Choices: `configs`, `deprecated`, `fixable` (off by default), `fixableAndHasSuggestions`, `hasSuggestions` (off by default), `options` (off by default), `requiresTypeChecking`, `type` (off by default). Default: `deprecated,configs,fixableAndHasSuggestions,requiresTypeChecking`. |

lib/cli.ts

@@ -56,6 +56,7 @@ async function loadConfigFileOptions() {
       configEmoji: schemaStringArray,
       ignoreConfig: schemaStringArray,
       ignoreDeprecatedRules: { type: 'boolean' },
+      initRuleDocs: { type: 'boolean' },
       pathRuleDoc: { type: 'string' },
       pathRuleList: { type: 'string' },
       ruleDocNotices: { type: 'string' },
@@ -133,6 +134,13 @@ export async function run(
       })`,
       parseBoolean
     )
+    .option(
+      '--init-rule-docs [boolean]',
+      `(optional) Whether to create rule doc files if they don't yet exist. (default: ${
+        OPTION_DEFAULTS[OPTION_TYPE.INIT_RULE_DOCS]
+      })`,
+      parseBoolean
+    )
     .option(
       '--path-rule-doc <path>',
       `(optional) Path to markdown file for each rule doc. Use \`{name}\` placeholder for the rule name. (default: ${

lib/generator.ts

@@ -1,5 +1,5 @@
-import { existsSync, readFileSync, writeFileSync } from 'node:fs';
-import { join, relative } from 'node:path';
+import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs';
+import { dirname, join, relative } from 'node:path';
 import { getAllNamedOptions, hasOptions } from './rule-options.js';
 import {
   loadPlugin,
@@ -100,6 +100,8 @@ export async function generate(path: string, options?: GenerateOptions) {
   const ignoreDeprecatedRules =
     options?.ignoreDeprecatedRules ??
     OPTION_DEFAULTS[OPTION_TYPE.IGNORE_DEPRECATED_RULES];
+  const initRuleDocs =
+    options?.initRuleDocs ?? OPTION_DEFAULTS[OPTION_TYPE.INIT_RULE_DOCS];
   const pathRuleDoc =
     options?.pathRuleDoc ?? OPTION_DEFAULTS[OPTION_TYPE.PATH_RULE_DOC];
   const pathRuleList =
@@ -157,14 +159,22 @@ export async function generate(path: string, options?: GenerateOptions) {
       (details) => !ignoreDeprecatedRules || !details.deprecated
     );
 
+  let initializedRuleDoc = false;
+
   // Update rule doc for each rule.
   for (const { name, description, schema } of details) {
     const pathToDoc = join(path, pathRuleDoc).replace(/{name}/g, name);
 
     if (!existsSync(pathToDoc)) {
-      throw new Error(
-        `Could not find rule doc: ${relative(getPluginRoot(path), pathToDoc)}`
-      );
+      if (!initRuleDocs) {
+        throw new Error(
+          `Could not find rule doc: ${relative(getPluginRoot(path), pathToDoc)}`
+        );
+      }
+
+      mkdirSync(dirname(pathToDoc), { recursive: true });
+      writeFileSync(pathToDoc, '');
+      initializedRuleDoc = true;
     }
 
     // Regenerate the header (title/notices) of each rule doc.
@@ -267,4 +277,10 @@ export async function generate(path: string, options?: GenerateOptions) {
   } else {
     writeFileSync(pathToReadme, readmeContentsNew, 'utf8');
   }
+
+  if (initRuleDocs && !initializedRuleDoc) {
+    throw new Error(
+      '--init-rule-docs was enabled, but no rule doc file needed to be created.'
+    );
+  }
 }

lib/options.ts

@@ -40,6 +40,7 @@ export enum OPTION_TYPE {
   CONFIG_EMOJI = 'configEmoji',
   IGNORE_CONFIG = 'ignoreConfig',
   IGNORE_DEPRECATED_RULES = 'ignoreDeprecatedRules',
+  INIT_RULE_DOCS = 'initRuleDocs',
   PATH_RULE_DOC = 'pathRuleDoc',
   PATH_RULE_LIST = 'pathRuleList',
   RULE_DOC_NOTICES = 'ruleDocNotices',
@@ -61,6 +62,7 @@ export const OPTION_DEFAULTS = {
   [OPTION_TYPE.CONFIG_EMOJI]: [],
   [OPTION_TYPE.IGNORE_CONFIG]: [],
   [OPTION_TYPE.IGNORE_DEPRECATED_RULES]: false,
+  [OPTION_TYPE.INIT_RULE_DOCS]: false,
   [OPTION_TYPE.PATH_RULE_DOC]: 'docs/rules/{name}.md',
   [OPTION_TYPE.PATH_RULE_LIST]: 'README.md',
   [OPTION_TYPE.RULE_DOC_NOTICES]: Object.entries(
@@ -88,6 +90,7 @@ export type GenerateOptions = {
   configEmoji?: string[];
   ignoreConfig?: string[];
   ignoreDeprecatedRules?: boolean;
+  initRuleDocs?: boolean;
   pathRuleDoc?: string;
   pathRuleList?: string;
   ruleDocNotices?: string;

test/lib/__snapshots__/cli-test.ts.snap

@@ -16,6 +16,7 @@ exports[`cli all CLI options and all config files options merges correctly, with
       "ignoredConfigFromCli2",
     ],
     "ignoreDeprecatedRules": true,
+    "initRuleDocs": false,
     "pathRuleDoc": "www.example.com/rule-doc-from-cli",
     "pathRuleList": "www.example.com/rule-list-from-cli",
     "ruleDocNotices": "type",
@@ -53,6 +54,7 @@ exports[`cli all CLI options, no config file options is called correctly 1`] = `
       "ignoredConfigFromCli2",
     ],
     "ignoreDeprecatedRules": true,
+    "initRuleDocs": false,
     "pathRuleDoc": "www.example.com/rule-doc-from-cli",
     "pathRuleList": "www.example.com/rule-list-from-cli",
     "ruleDocNotices": "type",
@@ -86,6 +88,7 @@ exports[`cli all config files options, no CLI options is called correctly 1`] =
       "ignoredConfigFromConfigFile2",
     ],
     "ignoreDeprecatedRules": true,
+    "initRuleDocs": true,
     "pathRuleDoc": "www.example.com/rule-doc-from-config-file",
     "pathRuleList": "www.example.com/rule-list-from-config-file",
     "ruleDocNotices": "type",

test/lib/cli-test.ts

@@ -11,6 +11,7 @@ const configFileOptionsAll: { [key in OPTION_TYPE]: unknown } = {
     'ignoredConfigFromConfigFile2',
   ],
   ignoreDeprecatedRules: true,
+  initRuleDocs: true,
   pathRuleDoc: 'www.example.com/rule-doc-from-config-file',
   pathRuleList: 'www.example.com/rule-list-from-config-file',
   ruleDocNotices: 'type',
@@ -43,6 +44,8 @@ const cliOptionsAll: { [key in OPTION_TYPE]: string[] } = {
 
   [OPTION_TYPE.IGNORE_DEPRECATED_RULES]: ['--ignore-deprecated-rules', 'true'],
 
+  [OPTION_TYPE.INIT_RULE_DOCS]: ['--init-rule-docs', 'false'],
+
   [OPTION_TYPE.PATH_RULE_DOC]: [
     '--path-rule-doc',
     'www.example.com/rule-doc-from-cli',

test/lib/generate/__snapshots__/file-paths-test.ts.snap

@@ -26,3 +26,10 @@ exports[`generate (file paths) lowercase README file generates the documentation
 
 <!-- end auto-generated rules list -->"
 `;
+
+exports[`generate (file paths) missing rule doc when initRuleDocs is true creates the rule doc 1`] = `
+"# test/no-foo
+
+<!-- end auto-generated rule header -->
+"
+`;

test/lib/generate/file-paths-test.ts

@@ -20,14 +20,65 @@ describe('generate (file paths)', function () {
         }),
 
         'index.js': `
-              export default {
-                rules: {
-                  'no-foo': {
-                    meta: { },
-                    create(context) {}
-                  },
-                },
-              };`,
+          export default {
+            rules: {
+              'no-foo': {
+                meta: { },
+                create(context) {}
+              },
+            },
+          };`,
+
+        'README.md':
+          '<!-- begin auto-generated rules list --><!-- end auto-generated rules list -->',
+
+        // Needed for some of the test infrastructure to work.
+        node_modules: mockFs.load(PATH_NODE_MODULES),
+      });
+    });
+
+    afterEach(function () {
+      mockFs.restore();
+      jest.resetModules();
+    });
+
+    describe('when initRuleDocs is false', () => {
+      it('throws an error', async function () {
+        // Use join to handle both Windows and Unix paths.
+        await expect(generate('.')).rejects.toThrow(
+          `Could not find rule doc: ${join('docs', 'rules', 'no-foo.md')}`
+        );
+      });
+    });
+
+    describe('when initRuleDocs is true', () => {
+      it('creates the rule doc', async function () {
+        await generate('.', { initRuleDocs: true });
+        expect(readFileSync('docs/rules/no-foo.md', 'utf8')).toMatchSnapshot();
+      });
+    });
+  });
+
+  describe('no missing rule doc but --init-rule-docs enabled', function () {
+    beforeEach(function () {
+      mockFs({
+        'docs/rules/no-foo.md': '',
+
+        'package.json': JSON.stringify({
+          name: 'eslint-plugin-test',
+          exports: 'index.js',
+          type: 'module',
+        }),
+
+        'index.js': `
+          export default {
+            rules: {
+              'no-foo': {
+                meta: { },
+                create(context) {}
+              },
+            },
+          };`,
 
         'README.md':
           '<!-- begin auto-generated rules list --><!-- end auto-generated rules list -->',
@@ -43,9 +94,8 @@ describe('generate (file paths)', function () {
     });
 
     it('throws an error', async function () {
-      // Use join to handle both Windows and Unix paths.
-      await expect(generate('.')).rejects.toThrow(
-        `Could not find rule doc: ${join('docs', 'rules', 'no-foo.md')}`
+      await expect(generate('.', { initRuleDocs: true })).rejects.toThrow(
+        '--init-rule-docs was enabled, but no rule doc file needed to be created.'
       );
     });
   });