refactor: move getShortLang outside markdown processor (#291)

Author: JounQin

README.md

@@ -32,6 +32,7 @@
 - [VSCode Extension](#vscode-extension)
 - [Packages](#packages)
 - [Install](#install)
+- [Notice](#notice)
 - [Usage](#usage)
 - [Parser Options](#parser-options)
 - [Rules](#rules)
@@ -67,6 +68,12 @@ yarn add -D eslint-plugin-mdx
 npm i -D eslint-plugin-mdx
 ```
 
+## Notice
+
+If you're using multi languages, `js/jsx/ts/tsx/vue`, etc for example, you'd better to always use [`overrides`](https://eslint.org/docs/user-guide/configuring/configuration-files#how-do-overrides-work) feature of ESLint, because configs may be overridden by following configs.
+
+See [#251](https://github.com/mdx-js/eslint-mdx/issues/251#issuecomment-736139224) for more details.
+
 ## Usage
 
 1. In your ESLint config file:
@@ -78,7 +85,10 @@ npm i -D eslint-plugin-mdx
         "extends": ["plugin:mdx/recommended"],
         // optional, if you want to lint code blocks at the same time
         "settings": {
-          "mdx/code-blocks": true
+          "mdx/code-blocks": true,
+          // optional, if you want to disable language mapper, set it to `false`
+          // if you want to override the default language mapper inside, you can provide your own
+          "mdx/language-mapper": {}
         }
       }
       ```
@@ -90,7 +100,10 @@ npm i -D eslint-plugin-mdx
         "extends": ["plugin:mdx/recommended"],
         // optional, if you want to lint code blocks at the same time
         "settings": {
-          "mdx/code-blocks": true
+          "mdx/code-blocks": true,
+          // optional, if you want to disable language mapper, set it to `false`
+          // if you want to override the default language mapper inside, you can provide your own
+          "mdx/language-mapper": {}
         },
         "overrides": [
           {
@@ -127,6 +140,9 @@ npm i -D eslint-plugin-mdx
         // optional, if you want to lint code blocks at the same time
         settings: {
           'mdx/code-blocks': true,
+          // optional, if you want to disable language mapper, set it to `false`
+          // if you want to override the default language mapper inside, you can provide your own
+          'mdx/language-mapper': {},
         },
         overrides: [
           {

packages/eslint-mdx/README.md

@@ -32,6 +32,7 @@
 - [VSCode Extension](#vscode-extension)
 - [Packages](#packages)
 - [Install](#install)
+- [Notice](#notice)
 - [Usage](#usage)
 - [Parser Options](#parser-options)
 - [Rules](#rules)
@@ -67,6 +68,12 @@ yarn add -D eslint-plugin-mdx
 npm i -D eslint-plugin-mdx
 ```
 
+## Notice
+
+If you're using multi languages, `js/jsx/ts/tsx/vue`, etc for example, you'd better to always use [`overrides`](https://eslint.org/docs/user-guide/configuring/configuration-files#how-do-overrides-work) feature of ESLint, because configs may be overridden by following configs.
+
+See [#251](https://github.com/mdx-js/eslint-mdx/issues/251#issuecomment-736139224) for more details.
+
 ## Usage
 
 1. In your ESLint config file:
@@ -78,7 +85,10 @@ npm i -D eslint-plugin-mdx
         "extends": ["plugin:mdx/recommended"],
         // optional, if you want to lint code blocks at the same time
         "settings": {
-          "mdx/code-blocks": true
+          "mdx/code-blocks": true,
+          // optional, if you want to disable language mapper, set it to `false`
+          // if you want to override the default language mapper inside, you can provide your own
+          "mdx/language-mapper": {}
         }
       }
       ```
@@ -90,7 +100,10 @@ npm i -D eslint-plugin-mdx
         "extends": ["plugin:mdx/recommended"],
         // optional, if you want to lint code blocks at the same time
         "settings": {
-          "mdx/code-blocks": true
+          "mdx/code-blocks": true,
+          // optional, if you want to disable language mapper, set it to `false`
+          // if you want to override the default language mapper inside, you can provide your own
+          "mdx/language-mapper": {}
         },
         "overrides": [
           {
@@ -127,6 +140,9 @@ npm i -D eslint-plugin-mdx
         // optional, if you want to lint code blocks at the same time
         settings: {
           'mdx/code-blocks': true,
+          // optional, if you want to disable language mapper, set it to `false`
+          // if you want to override the default language mapper inside, you can provide your own
+          'mdx/language-mapper': {},
         },
         overrides: [
           {

packages/eslint-plugin-mdx/README.md

@@ -32,6 +32,7 @@
 - [VSCode Extension](#vscode-extension)
 - [Packages](#packages)
 - [Install](#install)
+- [Notice](#notice)
 - [Usage](#usage)
 - [Parser Options](#parser-options)
 - [Rules](#rules)
@@ -67,6 +68,12 @@ yarn add -D eslint-plugin-mdx
 npm i -D eslint-plugin-mdx
 ```
 
+## Notice
+
+If you're using multi languages, `js/jsx/ts/tsx/vue`, etc for example, you'd better to always use [`overrides`](https://eslint.org/docs/user-guide/configuring/configuration-files#how-do-overrides-work) feature of ESLint, because configs may be overridden by following configs.
+
+See [#251](https://github.com/mdx-js/eslint-mdx/issues/251#issuecomment-736139224) for more details.
+
 ## Usage
 
 1. In your ESLint config file:
@@ -78,7 +85,10 @@ npm i -D eslint-plugin-mdx
         "extends": ["plugin:mdx/recommended"],
         // optional, if you want to lint code blocks at the same time
         "settings": {
-          "mdx/code-blocks": true
+          "mdx/code-blocks": true,
+          // optional, if you want to disable language mapper, set it to `false`
+          // if you want to override the default language mapper inside, you can provide your own
+          "mdx/language-mapper": {}
         }
       }
       ```
@@ -90,7 +100,10 @@ npm i -D eslint-plugin-mdx
         "extends": ["plugin:mdx/recommended"],
         // optional, if you want to lint code blocks at the same time
         "settings": {
-          "mdx/code-blocks": true
+          "mdx/code-blocks": true,
+          // optional, if you want to disable language mapper, set it to `false`
+          // if you want to override the default language mapper inside, you can provide your own
+          "mdx/language-mapper": {}
         },
         "overrides": [
           {
@@ -127,6 +140,9 @@ npm i -D eslint-plugin-mdx
         // optional, if you want to lint code blocks at the same time
         settings: {
           'mdx/code-blocks': true,
+          // optional, if you want to disable language mapper, set it to `false`
+          // if you want to override the default language mapper inside, you can provide your own
+          'mdx/language-mapper': {},
         },
         overrides: [
           {

packages/eslint-plugin-mdx/src/processors/helpers.ts

@@ -0,0 +1,24 @@
+import { last } from 'eslint-mdx'
+
+export const DEFAULT_LANGUAGE_MAPPER: Record<string, string> = {
+  javascript: 'js',
+  javascriptreact: 'jsx',
+  typescript: 'ts',
+  typescriptreact: 'tsx',
+  markdown: 'md',
+  mdown: 'md',
+  mkdn: 'md',
+}
+
+export function getShortLang(
+  filename: string,
+  languageMapper?: false | Record<string, string>,
+): string {
+  const language = last(filename.split('.'))
+  if (languageMapper === false) {
+    return language
+  }
+  languageMapper = { ...DEFAULT_LANGUAGE_MAPPER, ...languageMapper }
+  const lang = language.toLowerCase()
+  return languageMapper[language] || languageMapper[lang] || lang
+}

packages/eslint-plugin-mdx/src/processors/index.ts

@@ -1,6 +1,7 @@
 import { markdown } from './markdown'
 import { remark } from './remark'
 
+export * from './helpers'
 export * from './options'
 export * from './types'
 

packages/eslint-plugin-mdx/src/processors/markdown.ts

@@ -6,12 +6,11 @@
  */
 
 import type { Linter } from 'eslint'
-import { last } from 'eslint-mdx'
 import type { Node, Parent } from 'unist'
 
 import { remarkProcessor } from '../rules'
 
-import type { ESLintProcessor } from './types'
+import type { ESLintProcessor, ESLinterProcessorFile } from './types'
 
 export interface Block extends Node {
   baseIndentText: string
@@ -229,36 +228,13 @@ function getBlockRangeMap(
   return rangeMap
 }
 
-const LANGUAGES_MAPPER: Record<string, string> = {
-  javascript: 'js',
-  javascriptreact: 'jsx',
-  typescript: 'ts',
-  typescriptreact: 'tsx',
-  markdown: 'md',
-  mdown: 'md',
-  mkdn: 'md',
-}
-
-/**
- * get short language
- * @param lang original language
- * @returns short language
- */
-function getShortLang(lang: string): string {
-  const language = last(lang.split(/\s/u)[0].split('.')).toLowerCase()
-  return LANGUAGES_MAPPER[language] || language
-}
-
 /**
  * Extracts lintable JavaScript code blocks from Markdown text.
  * @param text The text of the file.
  * @param filename The filename of the file
  * @returns Source code strings to lint.
  */
-function preprocess(
-  text: string,
-  filename: string,
-): Array<string | { text: string; filename: string }> {
+function preprocess(text: string, filename: string): ESLinterProcessorFile[] {
   const ast = remarkProcessor.parse(text)
   const blocks: Block[] = []
 
@@ -299,7 +275,7 @@ function preprocess(
   })
 
   return blocks.map((block, index) => ({
-    filename: `${index}.${getShortLang(block.lang as string)}`,
+    filename: `${index}.${block.lang as string}`,
     text: [...block.comments, block.value, ''].join('\n'),
   }))
 }
@@ -405,7 +381,7 @@ function postprocess(
   )
 }
 
-export const markdown: ESLintProcessor = {
+export const markdown: ESLintProcessor<ESLinterProcessorFile> = {
   preprocess,
   postprocess,
   supportsAutofix: SUPPORTS_AUTOFIX,

packages/eslint-plugin-mdx/src/processors/options.ts

@@ -4,7 +4,7 @@
 
 import type { Linter, SourceCode } from 'eslint'
 
-import type { ProcessorOptions } from './types'
+import type { ESLintMdxSettings, ProcessorOptions } from './types'
 
 export const processorOptions = {} as ProcessorOptions
 
@@ -35,20 +35,20 @@ ESLinter.prototype.verify = function (
   options?: string | Linter.LintOptions,
 ) {
   // fetch settings
-  const settings =
-    (config &&
-      (typeof config.extractConfig === 'function'
-        ? config.extractConfig(
-            /* istanbul ignore next */
-            typeof options === 'undefined' || typeof options === 'string'
-              ? options
-              : options.filename,
-          )
-        : config
-      ).settings) ||
-    {}
+  const settings = ((config &&
+    (typeof config.extractConfig === 'function'
+      ? config.extractConfig(
+          /* istanbul ignore next */
+          typeof options === 'undefined' || typeof options === 'string'
+            ? options
+            : options.filename,
+        )
+      : config
+    ).settings) ||
+    {}) as ESLintMdxSettings
 
   processorOptions.lintCodeBlocks = settings['mdx/code-blocks'] === true
+  processorOptions.languageMapper = settings['mdx/language-mapper']
 
   // call original Linter#verify
   return verify.call(this, code, config, options as Linter.LintOptions)

packages/eslint-plugin-mdx/src/processors/remark.ts

@@ -2,6 +2,7 @@ import type { Linter } from 'eslint'
 
 import type { RemarkLintMessage } from '../rules'
 
+import { getShortLang } from './helpers'
 import { markdown } from './markdown'
 import { processorOptions } from './options'
 import type { ESLintProcessor } from './types'
@@ -13,7 +14,16 @@ export const remark: ESLintProcessor = {
       return [text]
     }
 
-    return [...markdown.preprocess(text, filename), text]
+    return [
+      ...markdown.preprocess(text, filename).map(({ text, filename }) => ({
+        text,
+        filename:
+          filename.slice(0, filename.lastIndexOf('.')) +
+          '.' +
+          getShortLang(filename, processorOptions.languageMapper),
+      })),
+      text,
+    ]
   },
   postprocess(lintMessages, filename) {
     return markdown.postprocess(lintMessages, filename).map(lintMessage => {

packages/eslint-plugin-mdx/src/processors/types.ts

@@ -1,18 +1,28 @@
 import type { Linter } from 'eslint'
 
+export interface ESLinterProcessorFile {
+  text: string
+  filename: string
+}
+
 // https://eslint.org/docs/developer-guide/working-with-plugins#processors-in-plugins
-export interface ESLintProcessor {
+export interface ESLintProcessor<
+  T extends string | ESLinterProcessorFile = string | ESLinterProcessorFile
+> {
   supportsAutofix?: boolean
-  preprocess?(
-    text: string,
-    filename: string,
-  ): Array<string | { text: string; filename: string }>
+  preprocess?(text: string, filename: string): T[]
   postprocess?(
     messages: Linter.LintMessage[][],
     filename: string,
   ): Linter.LintMessage[]
 }
 
+export interface ESLintMdxSettings {
+  'mdx/code-blocks': boolean
+  'mdx/language-mapper'?: false | Record<string, string>
+}
+
 export interface ProcessorOptions {
   lintCodeBlocks: boolean
+  languageMapper?: false | Record<string, string>
 }

packages/eslint-plugin-mdx/src/rules/helpers.ts

@@ -59,7 +59,7 @@ export const getRemarkProcessor = (searchFrom: string, isMdx: boolean) => {
     /* istanbul ignore if */
     if (
       (err as { code?: string }).code !== 'ENOTDIR' ||
-      !/\d+_?\.[a-z]+$/.test(searchFrom)
+      !/[/\\]\d+_[^/\\]*\.[\da-z]+$/i.test(searchFrom)
     ) {
       throw err
     }