add support for markdown

src/index.ts

@@ -12,6 +12,7 @@ import { Javascript } from './languages/javascript';
 import { Julia } from './languages/julia';
 import { Kotlin } from './languages/kotlin';
 import { Lua } from './languages/lua';
+import { Markdown } from './languages/markdown';
 import { Pascal } from './languages/pascal';
 import { PHP } from './languages/php';
 import { Python } from './languages/python';
@@ -36,6 +37,7 @@ const languages: Record<string, LanguagePattern[]> = {
   Julia,
   Kotlin,
   Lua,
+  Markdown,
   Pascal,
   PHP,
   Python,

src/languages/markdown.ts

@@ -0,0 +1,22 @@
+import type { LanguagePattern } from '../types';
+
+export const Markdown: LanguagePattern[] = [
+  // headings
+  { pattern: /(#){1,6} .+/, type: 'macro', nearTop: true },
+  // headings alternate syntax
+  { pattern: /^(?!!)(=|-){2,}(?<!>)$/, type: 'meta.module', nearTop: true },
+  // bold
+  { pattern: /(\w*(?!\/)(\*\*)\w+(\*\*)\w*)|(\w*(__)\w+(__)\w*)/, type: 'macro', nearTop: true },
+  // italic
+  { pattern: /(^.*(\*).+(\*)(?<!\/).*)$|^(.*(_).+(_).*)$/, type: 'macro', nearTop: true },
+  // lists
+  { pattern: /^(?!-)(- \w*)(?<!-)|^(?!\/)(\* .*)/, type: 'meta.module', nearTop: true },
+  // images
+  { pattern: /!\[.+\]\(.+\)/, type: 'macro', nearTop: true },
+  // links
+  { pattern: /\[.+\]\(.+\)/, type: 'macro', nearTop: true },
+  // blockquotes
+  { pattern: /^(> .*)+/, type: 'macro', nearTop: true },
+  // inline code
+  { pattern: /.*`.+`.*/, type: 'meta.module', nearTop: true },
+];

tests/cpp.test.ts

@@ -32,6 +32,7 @@ test('hello world', () => {
     SQL: 0,
     Unknown: 1,
     YAML: 0,
+    Markdown: 0,
   });
 });
 

tests/cs.test.ts

@@ -32,6 +32,7 @@ test('hello world', () => {
     SQL: 0,
     Unknown: 1,
     YAML: 0,
+    Markdown: 0,
   });
 });
 

tests/large.test.ts

@@ -679,6 +679,7 @@ test('large input', () => {
     SQL: 24,
     Unknown: 1,
     YAML: 4,
+    Markdown: 9,
   });
 });
 

tests/markdown.test.ts

@@ -0,0 +1,97 @@
+import { test } from 'uvu';
+import * as assert from 'uvu/assert';
+import detectLang from '../src/index';
+
+test('heading 1', () => {
+  const code = detectLang('# Heading level 1');
+  assert.equal(code, 'Markdown');
+});
+
+test('heading 2', () => {
+  const code = detectLang('## Heading level 2');
+  assert.equal(code, 'Markdown');
+});
+
+test('heading 3', () => {
+  const code = detectLang('### Heading level 3');
+  assert.equal(code, 'Markdown');
+});
+
+test('heading 4', () => {
+  const code = detectLang('#### Heading level 4');
+  assert.equal(code, 'Markdown');
+});
+
+test('heading 5', () => {
+  const code = detectLang('##### Heading level 5');
+  assert.equal(code, 'Markdown');
+});
+
+test('heading 6', () => {
+  const code = detectLang('###### Heading level 6');
+  assert.equal(code, 'Markdown');
+});
+
+test('heading 1 alternate syntax', () => {
+  const code = detectLang('Heading level 1\n============');
+  assert.equal(code, 'Markdown');
+});
+
+test('heading 2 alternate syntax', () => {
+  const code = detectLang('Heading level 1\n------------');
+  assert.equal(code, 'Markdown');
+});
+
+test('bold syntax 1', () => {
+  const code = detectLang('**This text will be bold**');
+  assert.equal(code, 'Markdown');
+});
+
+test('bold syntax 2', () => {
+  const code = detectLang('__This will also be bold__');
+  assert.equal(code, 'Markdown');
+});
+
+test('italic syntax 1', () => {
+  const code = detectLang('*This text will be italic*');
+  assert.equal(code, 'Markdown');
+});
+
+test('italic syntax 2', () => {
+  const code = detectLang('_This will also be italic_');
+  assert.equal(code, 'Markdown');
+});
+
+test('list syntax 1', () => {
+  const code = detectLang(`* Item 1`);
+  assert.equal(code, 'Markdown');
+});
+
+// FIXME: Conflicts with YAML
+test.skip('list syntax 2', () => {
+  const code = detectLang(`- Item 1`);
+  assert.equal(code, 'Markdown');
+});
+
+test('images', () => {
+  const code = detectLang(`![GitHub Logo](/images/logo.png)`);
+  assert.equal(code, 'Markdown');
+});
+
+test('links', () => {
+  const code = detectLang(`[GitHub](http://github.com)`);
+  assert.equal(code, 'Markdown');
+});
+
+test('blockquotes', () => {
+  const code = detectLang(`> We're living the future so
+  > the present is our past.`);
+  assert.equal(code, 'Markdown');
+});
+
+test('inline code', () => {
+  const code = detectLang('I think you should use an`<addr>` element here instead.');
+  assert.equal(code, 'Markdown');
+});
+
+test.run();