Support a user-defined function for --url-rule-doc option (#369)

README.md

@@ -146,7 +146,7 @@ There's also a `postprocess` option that's only available via a [config file](#c
 | `--rule-list-columns` | Ordered, comma-separated list of columns to display in rule list. Empty columns will be hidden. See choices in below [table](#column-and-notice-types). Default: `name,description,configsError,configsWarn,configsOff,fixable,hasSuggestions,requiresTypeChecking,deprecated`. |
 | `--rule-list-split` | Rule property(s) to split the rules list by. A separate list and header will be created for each value. Example: `meta.type`. A function can also be provided for this option via a [config file](#configuration-file). |
 | `--url-configs` | Link to documentation about the ESLint configurations exported by the plugin. |
-| `--url-rule-doc` | Link to documentation for each rule. Useful when it differs from the rule doc path on disk (e.g. custom documentation site in use). Use `{name}` placeholder for the rule name. |
+| `--url-rule-doc` | Link to documentation for each rule. Useful when it differs from the rule doc path on disk (e.g. custom documentation site in use). Use `{name}` placeholder for the rule name. A function can also be provided for this option via a [config file](#configuration-file). |
 
 ### Column and notice types
 
@@ -241,6 +241,22 @@ const config = {
 module.exports = config;
 ```
 
+Example `.eslint-doc-generatorrc.js` with `urlRuleDoc` function:
+
+```js
+/** @type {import('eslint-doc-generator').GenerateOptions} */
+const config = {
+  urlRuleDoc(name, page) {
+    if (page === 'README.md') {
+      // Use URLs only in the readme.
+      return `https://example.com/rules/${name}.html`;
+    }
+  },
+};
+
+module.exports = config;
+```
+
 ### Badges
 
 While config emojis are the recommended representations of configs that a rule belongs to (see [`--config-emoji`](#configuration-options)), you can alternatively define badges for configs at the bottom of your `README.md`.

lib/cli.ts

@@ -116,7 +116,14 @@ async function loadConfigFileOptions(): Promise<GenerateOptions> {
             }
           : { anyOf: [{ type: 'string' }, schemaStringArray] },
       urlConfigs: { type: 'string' },
-      urlRuleDoc: { type: 'string' },
+      urlRuleDoc:
+        /* istanbul ignore next -- TODO: haven't tested JavaScript config files yet https://github.com/bmish/eslint-doc-generator/issues/366 */
+        // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
+        typeof explorerResults.config.urlRuleDoc === 'function'
+          ? {
+              /* Functions are allowed but JSON Schema can't validate them so no-op in this case. */
+            }
+          : { type: 'string' },
     };
     const schema = {
       type: 'object',
@@ -290,7 +297,7 @@ export async function run(
     )
     .option(
       '--url-rule-doc <url>',
-      '(optional) Link to documentation for each rule. Useful when it differs from the rule doc path on disk (e.g. custom documentation site in use). Use `{name}` placeholder for the rule name.'
+      '(optional) Link to documentation for each rule. Useful when it differs from the rule doc path on disk (e.g. custom documentation site in use). Use `{name}` placeholder for the rule name. To specify a function, use a JavaScript-based config file.'
     )
     .action(async function (path: string, options: GenerateOptions) {
       // Load config file options and merge with CLI options.

lib/rule-doc-notices.ts

@@ -15,12 +15,12 @@ import {
   ConfigEmojis,
   SEVERITY_TYPE,
   NOTICE_TYPE,
-  RULE_SOURCE,
+  UrlRuleDocFunction,
 } from './types.js';
 import { RULE_TYPE, RULE_TYPE_MESSAGES_NOTICES } from './rule-type.js';
 import { RuleDocTitleFormat } from './rule-doc-title-format.js';
 import { hasOptions } from './rule-options.js';
-import { getLinkToRule, getUrlToRule } from './rule-link.js';
+import { getLinkToRule, replaceRulePlaceholder } from './rule-link.js';
 import {
   toSentenceCase,
   removeTrailingPeriod,
@@ -102,7 +102,7 @@ const RULE_NOTICES: {
         pathPlugin: string;
         pathRuleDoc: string;
         type?: `${RULE_TYPE}`;
-        urlRuleDoc?: string;
+        urlRuleDoc?: string | UrlRuleDocFunction;
       }) => string);
 } = {
   // Configs notice varies based on whether the rule is configured in one or more configs.
@@ -189,27 +189,14 @@ const RULE_NOTICES: {
     ruleName,
     urlRuleDoc,
   }) => {
-    const urlCurrentPage = getUrlToRule(
-      ruleName,
-      RULE_SOURCE.self,
-      pluginPrefix,
-      pathPlugin,
-      pathRuleDoc,
-      pathPlugin,
-      urlRuleDoc
-    );
-    /* istanbul ignore next -- this shouldn't happen */
-    if (!urlCurrentPage) {
-      throw new Error('Missing URL to our own rule');
-    }
     const replacementRuleList = (replacedBy ?? []).map((replacementRuleName) =>
       getLinkToRule(
         replacementRuleName,
         plugin,
         pluginPrefix,
         pathPlugin,
         pathRuleDoc,
-        urlCurrentPage,
+        replaceRulePlaceholder(pathRuleDoc, ruleName),
         true,
         true,
         urlRuleDoc
@@ -318,7 +305,7 @@ function getRuleNoticeLines(
   ignoreConfig: readonly string[],
   ruleDocNotices: readonly NOTICE_TYPE[],
   urlConfigs?: string,
-  urlRuleDoc?: string
+  urlRuleDoc?: string | UrlRuleDocFunction
 ) {
   const lines: string[] = [];
 
@@ -502,7 +489,7 @@ export function generateRuleHeaderLines(
   ruleDocNotices: readonly NOTICE_TYPE[],
   ruleDocTitleFormat: RuleDocTitleFormat,
   urlConfigs?: string,
-  urlRuleDoc?: string
+  urlRuleDoc?: string | UrlRuleDocFunction
 ): string {
   return [
     makeRuleDocTitle(name, description, pluginPrefix, ruleDocTitleFormat),

lib/rule-link.ts

@@ -1,6 +1,6 @@
 import { countOccurrencesInString } from './string.js';
 import { join, sep, relative } from 'node:path';
-import { Plugin, RULE_SOURCE } from './types.js';
+import { Plugin, RULE_SOURCE, UrlRuleDocFunction } from './types.js';
 
 export function replaceRulePlaceholder(pathOrUrl: string, ruleName: string) {
   return pathOrUrl.replace(/\{name\}/gu, ruleName);
@@ -35,8 +35,8 @@ export function getUrlToRule(
   pluginPrefix: string,
   pathPlugin: string,
   pathRuleDoc: string,
-  urlCurrentPage: string,
-  urlRuleDoc?: string
+  pathCurrentPage: string,
+  urlRuleDoc?: string | UrlRuleDocFunction
 ) {
   switch (ruleSource) {
     case RULE_SOURCE.eslintCore:
@@ -50,7 +50,7 @@ export function getUrlToRule(
   }
 
   const nestingDepthOfCurrentPage = countOccurrencesInString(
-    relative(pathPlugin, urlCurrentPage),
+    relative(pathPlugin, pathCurrentPage),
     sep
   );
   const relativePathPluginRoot = goUpLevel(nestingDepthOfCurrentPage);
@@ -61,14 +61,26 @@ export function getUrlToRule(
     ? ruleName.slice(pluginPrefix.length + 1)
     : ruleName;
 
-  return urlRuleDoc
-    ? replaceRulePlaceholder(urlRuleDoc, ruleNameWithoutPluginPrefix)
-    : pathToUrl(
-        join(
-          relativePathPluginRoot,
-          replaceRulePlaceholder(pathRuleDoc, ruleNameWithoutPluginPrefix)
-        )
-      );
+  // If the URL is a function, evaluate it.
+  const urlRuleDocFunctionEvaluated =
+    typeof urlRuleDoc === 'function'
+      ? urlRuleDoc(ruleName, pathToUrl(relative(pathPlugin, pathCurrentPage)))
+      : undefined;
+
+  return (
+    // If the function returned a URL, use it.
+    urlRuleDocFunctionEvaluated ??
+    (typeof urlRuleDoc === 'string'
+      ? // Otherwise, use the URL if it's a string.
+        replaceRulePlaceholder(urlRuleDoc, ruleNameWithoutPluginPrefix)
+      : // Finally, fallback to the relative path.
+        pathToUrl(
+          join(
+            relativePathPluginRoot,
+            replaceRulePlaceholder(pathRuleDoc, ruleNameWithoutPluginPrefix)
+          )
+        ))
+  );
 }
 
 /**
@@ -80,10 +92,10 @@ export function getLinkToRule(
   pluginPrefix: string,
   pathPlugin: string,
   pathRuleDoc: string,
-  urlCurrentPage: string,
+  pathCurrentPage: string,
   includeBackticks: boolean,
   includePrefix: boolean,
-  urlRuleDoc?: string
+  urlRuleDoc?: string | UrlRuleDocFunction
 ) {
   const ruleNameWithoutPluginPrefix = ruleName.startsWith(`${pluginPrefix}/`)
     ? ruleName.slice(pluginPrefix.length + 1)
@@ -112,7 +124,7 @@ export function getLinkToRule(
     pluginPrefix,
     pathPlugin,
     pathRuleDoc,
-    urlCurrentPage,
+    pathCurrentPage,
     urlRuleDoc
   );
 

lib/rule-list.ts

@@ -20,6 +20,7 @@ import {
   RuleListSplitFunction,
   RuleModule,
   SEVERITY_TYPE,
+  UrlRuleDocFunction,
 } from './types.js';
 import { markdownTable } from 'markdown-table';
 import type {
@@ -107,7 +108,7 @@ function buildRuleRow(
   pathRuleList: string,
   configEmojis: ConfigEmojis,
   ignoreConfig: readonly string[],
-  urlRuleDoc?: string
+  urlRuleDoc?: string | UrlRuleDocFunction
 ): readonly string[] {
   const columns: {
     [key in COLUMN_TYPE]: string | (() => string);
@@ -190,7 +191,7 @@ function generateRulesListMarkdown(
   pathRuleList: string,
   configEmojis: ConfigEmojis,
   ignoreConfig: readonly string[],
-  urlRuleDoc?: string
+  urlRuleDoc?: string | UrlRuleDocFunction
 ): string {
   const listHeaderRow = (
     Object.entries(columns) as readonly [COLUMN_TYPE, boolean][]
@@ -245,7 +246,7 @@ function generateRuleListMarkdownForRulesAndHeaders(
   pathRuleList: string,
   configEmojis: ConfigEmojis,
   ignoreConfig: readonly string[],
-  urlRuleDoc?: string
+  urlRuleDoc?: string | UrlRuleDocFunction
 ): string {
   const parts: string[] = [];
 
@@ -388,7 +389,7 @@ export function updateRulesList(
   ruleListColumns: readonly COLUMN_TYPE[],
   ruleListSplit: readonly string[] | RuleListSplitFunction,
   urlConfigs?: string,
-  urlRuleDoc?: string
+  urlRuleDoc?: string | UrlRuleDocFunction
 ): string {
   let listStartIndex = markdown.indexOf(BEGIN_RULE_LIST_MARKER);
   let listEndIndex = markdown.indexOf(END_RULE_LIST_MARKER);

lib/types.ts

@@ -126,6 +126,18 @@ export type RuleListSplitFunction = (rules: RuleNamesAndRules) => readonly {
   rules: RuleNamesAndRules;
 }[];
 
+/**
+ * Function for generating the URL to a rule doc.
+ * Can be provided via a JavaScript-based config file using the `urlRuleDoc` option.
+ * @param name - the name of the rule
+ * @param path - the file path to the current page displaying the link, relative to the project root
+ * @returns the URL to the rule doc, or `undefined` to fallback to the default logic (relative URL)
+ */
+export type UrlRuleDocFunction = (
+  name: string,
+  path: string
+) => string | undefined;
+
 // JSDocs for options should be kept in sync with README.md and the CLI runner in cli.ts.
 /** The type for the config file (e.g. `.eslint-doc-generatorrc.js`) and internal `generate()` function. */
 export type GenerateOptions = {
@@ -194,9 +206,9 @@ export type GenerateOptions = {
   /** Link to documentation about the ESLint configurations exported by the plugin. */
   readonly urlConfigs?: string;
   /**
-   * Link to documentation for each rule.
+   * Link (or function to generate a link) to documentation for each rule.
    * Useful when it differs from the rule doc path on disk (e.g. custom documentation site in use).
-   * Use `{name}` placeholder for the rule name.
+   * For the string version, use `{name}` placeholder for the rule name.
    */
-  readonly urlRuleDoc?: string;
+  readonly urlRuleDoc?: string | UrlRuleDocFunction;
 };

test/lib/generate/__snapshots__/option-url-rule-doc-test.ts.snap

@@ -30,3 +30,95 @@ exports[`generate (--url-rule-doc) basic uses the right URLs 3`] = `
 <!-- end auto-generated rule header -->
 "
 `;
+
+exports[`generate (--url-rule-doc) function returns undefined should fallback to the normal URL 1`] = `
+"## Rules
+<!-- begin auto-generated rules list -->
+
+❌ Deprecated.
+
+| Name                           | Description             | ❌  |
+| :----------------------------- | :---------------------- | :- |
+| [no-bar](docs/rules/no-bar.md) | Description for no-bar. |    |
+| [no-foo](docs/rules/no-foo.md) | Description for no-foo. | ❌  |
+
+<!-- end auto-generated rules list -->
+"
+`;
+
+exports[`generate (--url-rule-doc) function returns undefined should fallback to the normal URL 2`] = `
+"## Rules
+<!-- begin auto-generated rules list -->
+
+❌ Deprecated.
+
+| Name                              | Description             | ❌  |
+| :-------------------------------- | :---------------------- | :- |
+| [no-bar](../docs/rules/no-bar.md) | Description for no-bar. |    |
+| [no-foo](../docs/rules/no-foo.md) | Description for no-foo. | ❌  |
+
+<!-- end auto-generated rules list -->
+"
+`;
+
+exports[`generate (--url-rule-doc) function returns undefined should fallback to the normal URL 3`] = `
+"# Description for no-foo (\`test/no-foo\`)
+
+❌ This rule is deprecated. It was replaced by [\`test/no-bar\`](../../docs/rules/no-bar.md).
+
+<!-- end auto-generated rule header -->
+"
+`;
+
+exports[`generate (--url-rule-doc) function returns undefined should fallback to the normal URL 4`] = `
+"# Description for no-bar (\`test/no-bar\`)
+
+<!-- end auto-generated rule header -->
+"
+`;
+
+exports[`generate (--url-rule-doc) function uses the custom URL 1`] = `
+"## Rules
+<!-- begin auto-generated rules list -->
+
+❌ Deprecated.
+
+| Name                                                               | Description             | ❌  |
+| :----------------------------------------------------------------- | :---------------------- | :- |
+| [no-bar](https://example.com/rule-docs/name:no-bar/path:README.md) | Description for no-bar. |    |
+| [no-foo](https://example.com/rule-docs/name:no-foo/path:README.md) | Description for no-foo. | ❌  |
+
+<!-- end auto-generated rules list -->
+"
+`;
+
+exports[`generate (--url-rule-doc) function uses the custom URL 2`] = `
+"## Rules
+<!-- begin auto-generated rules list -->
+
+❌ Deprecated.
+
+| Name                                                                      | Description             | ❌  |
+| :------------------------------------------------------------------------ | :---------------------- | :- |
+| [no-bar](https://example.com/rule-docs/name:no-bar/path:nested/README.md) | Description for no-bar. |    |
+| [no-foo](https://example.com/rule-docs/name:no-foo/path:nested/README.md) | Description for no-foo. | ❌  |
+
+<!-- end auto-generated rules list -->
+"
+`;
+
+exports[`generate (--url-rule-doc) function uses the custom URL 3`] = `
+"# Description for no-foo (\`test/no-foo\`)
+
+❌ This rule is deprecated. It was replaced by [\`test/no-bar\`](https://example.com/rule-docs/name:no-bar/path:docs/rules/no-foo.md).
+
+<!-- end auto-generated rule header -->
+"
+`;
+
+exports[`generate (--url-rule-doc) function uses the custom URL 4`] = `
+"# Description for no-bar (\`test/no-bar\`)
+
+<!-- end auto-generated rule header -->
+"
+`;