diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..7586723
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,9 @@
+{
+  "env": {
+    "node": true,
+    "browser": true
+  },
+  "rules": {
+    "quotes": [2, "single"]
+  }
+}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f41859a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+.DS_Store
+*.log
+bower_components/
+build/
+components/
+coverage/
+node_modules/
+build.js
diff --git a/.jscs.json b/.jscs.json
new file mode 100644
index 0000000..7345bfb
--- /dev/null
+++ b/.jscs.json
@@ -0,0 +1,143 @@
+{
+  "plugins": [
+    "jscs-jsdoc"
+  ],
+  "jsDoc": {
+    "checkAnnotations": "jsdoc3",
+    "checkParamNames": true,
+    "requireParamTypes": true,
+    "checkRedundantParams": true,
+    "checkReturnTypes": true,
+    "checkRedundantReturns": true,
+    "requireReturnTypes": true,
+    "checkTypes": "strictNativeCase",
+    "checkRedundantAccess": true,
+    "enforceExistence": true,
+    "requireHyphenBeforeDescription": true
+  },
+  "requireCurlyBraces": [
+    "if",
+    "else",
+    "for",
+    "while",
+    "do",
+    "try",
+    "catch"
+  ],
+  "requireSpaceAfterKeywords": [
+    "if",
+    "else",
+    "for",
+    "while",
+    "do",
+    "switch",
+    "return",
+    "try",
+    "catch"
+  ],
+  "requireSpaceBeforeBlockStatements": true,
+  "requireParenthesesAroundIIFE": true,
+  "requireSpacesInConditionalExpression": true,
+  "requireSpacesInAnonymousFunctionExpression": {
+    "beforeOpeningRoundBrace": true,
+    "beforeOpeningCurlyBrace": true
+  },
+  "requireSpacesInNamedFunctionExpression": {
+    "beforeOpeningRoundBrace": true,
+    "beforeOpeningCurlyBrace": true
+  },
+  "requireSpacesInFunctionExpression": {
+    "beforeOpeningCurlyBrace": true
+  },
+  "requireBlocksOnNewline": true,
+  "disallowPaddingNewlinesInBlocks": true,
+  "disallowEmptyBlocks": true,
+  "disallowSpacesInsideObjectBrackets": true,
+  "disallowSpacesInsideArrayBrackets": true,
+  "disallowSpacesInsideParentheses": true,
+  "requireSpacesInsideObjectBrackets": "all",
+  "disallowDanglingUnderscores": true,
+  "disallowSpaceAfterObjectKeys": true,
+  "requireCommaBeforeLineBreak": true,
+  "requireOperatorBeforeLineBreak": [
+    "?",
+    "+",
+    "-",
+    "/",
+    "*",
+    "=",
+    "==",
+    "===",
+    "!=",
+    "!==",
+    ">",
+    ">=",
+    "<",
+    "<="
+  ],
+  "requireSpaceBeforeBinaryOperators": [
+    "+",
+    "-",
+    "/",
+    "*",
+    "=",
+    "==",
+    "===",
+    "!=",
+    "!=="
+  ],
+  "requireSpaceAfterBinaryOperators": [
+    "+",
+    "-",
+    "/",
+    "*",
+    "=",
+    "==",
+    "===",
+    "!=",
+    "!=="
+  ],
+  "disallowSpaceAfterPrefixUnaryOperators": [
+    "++",
+    "--",
+    "+",
+    "-",
+    "~",
+    "!"
+  ],
+  "disallowSpaceBeforePostfixUnaryOperators": [
+    "++",
+    "--"
+  ],
+  "disallowImplicitTypeConversion": [
+    "numeric",
+    "boolean",
+    "binary",
+    "string"
+  ],
+  "requireCamelCaseOrUpperCaseIdentifiers": true,
+  "disallowKeywords": [
+    "with"
+  ],
+  "disallowMultipleLineStrings": true,
+  "disallowMultipleLineBreaks": true,
+  "validateLineBreaks": "LF",
+  "validateQuoteMarks": "'",
+  "disallowMixedSpacesAndTabs": true,
+  "disallowTrailingWhitespace": true,
+  "disallowTrailingComma": true,
+  "disallowKeywordsOnNewLine": [
+    "else"
+  ],
+  "requireLineFeedAtFileEnd": true,
+  "maximumLineLength": 78,
+  "requireCapitalizedConstructors": true,
+  "safeContextKeyword": "self",
+  "requireDotNotation": true,
+  "disallowYodaConditions": true,
+  "validateJSDoc": {
+    "checkParamNames": true,
+    "checkRedundantParams": true,
+    "requireParamTypes": true
+  }
+}
diff --git a/.npmignore b/.npmignore
new file mode 100644
index 0000000..adbc59e
--- /dev/null
+++ b/.npmignore
@@ -0,0 +1,15 @@
+.*
+*.log
+bower_components/
+build/
+components/
+coverage/
+node_modules/
+test/
+build.js
+example.js
+mdast-github.js
+mdast-github.min.js
+bower.json
+component.json
+History.md
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..b457dbd
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,16 @@
+language: node_js
+script: npm run-script test-travis
+node_js:
+- '0.10'
+- '0.11'
+- '0.12'
+- iojs
+after_script: npm install coveralls@2.10.0 && cat ./coverage/lcov.info | coveralls
+sudo: false
+deploy:
+  provider: npm
+  email: tituswormer@gmail.com
+  api_key:
+    secure: eXE7Veb+DIeH1B39sjwn22+LlJVqELk07/Mx48vWd5OGUK38NYN781mH+1cB6JrtIM0lJlAu1RJahbZo8uEcINEpZIXKR7UiUwOng1EbrSeV+DgC2HL71lPxapeYmU6eGkCiu2usAM6o7Wn8XY9//HP8+weBVnWhDCVuCqQSCx8=
+  on:
+    repo: wooorm/mdast-github
diff --git a/History.md b/History.md
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/History.md
@@ -0,0 +1 @@
+
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..32e7a3d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,22 @@
+(The MIT License)
+
+Copyright (c) 2015 Titus Wormer <tituswormer@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/Readme.md b/Readme.md
new file mode 100644
index 0000000..dc4c05d
--- /dev/null
+++ b/Readme.md
@@ -0,0 +1,152 @@
+# mdast-github [![Build Status](https://img.shields.io/travis/wooorm/mdast-github.svg?style=flat)](https://travis-ci.org/wooorm/mdast-github) [![Coverage Status](https://img.shields.io/coveralls/wooorm/mdast-github.svg?style=flat)](https://coveralls.io/r/wooorm/mdast-github?branch=master)
+
+Auto-link references to commits, issues, pull-requests, and users like GitHub: [Writing on GitHub](https://help.github.com/articles/writing-on-github/#references).
+
+## Installation
+
+[npm](https://docs.npmjs.com/cli/install)
+
+```bash
+$ npm install mdast-github
+```
+
+[Component.js](https://github.com/componentjs/component)
+
+```bash
+$ component install wooorm/mdast-github
+```
+
+[Bower](http://bower.io/#install-packages)
+
+```bash
+$ bower install mdast-github
+```
+
+[Duo](http://duojs.org/#getting-started)
+
+```javascript
+var github = require('wooorm/mdast-github');
+```
+
+UMD: globals, AMD, and CommonJS ([uncompressed](mdast-github.js) and [compressed](mdast-github.min.js)):
+
+```html
+<script src="path/to/mdast.js"></script>
+<script src="path/to/mdast-github.js"></script>
+<script>
+  mdast.use(mdastGitHub);
+</script>
+```
+
+## Table of Contents
+
+-   [Usage](#usage)
+-   [API](#api)
+    -   [mdast.use(github)](#mdastusegithub)
+-   [CLI](#cli)
+-   [License](#license)
+
+## Usage
+
+Dependencies and input:
+
+```javascript
+var github = require('mdast-github');
+var mdast = require('mdast').use(github);
+var input = [
+    '* SHA: a5c3785ed8d6a35868bc169f07e40e889087fd2e',
+    '* User@SHA: jlord@a5c3785ed8d6a35868bc169f07e40e889087fd2e',
+    '* User/Repository@SHA: jlord/sheetsee.js@a5c3785e',
+    '* #Num: #26',
+    '* GH-Num: GH-26',
+    '* User#Num: jlord#26',
+    '* User/Repository#Num: jlord/sheetsee.js#26',
+    '* @mention',
+    '* And @mentioning someone else',
+    '* And nothing.'
+].join('\n');
+```
+
+Stringify:
+
+```javascript
+var doc = mdast.stringify(mdast.parse(input));
+```
+
+Yields:
+
+```markdown
+-   SHA: [a5c3785](https://github.com/wooorm/mdast-github/commit/a5c3785ed8d6a35868bc169f07e40e889087fd2e)
+-   User@SHA: [jlord@a5c3785](https://github.com/jlord/mdast-github/commit/a5c3785ed8d6a35868bc169f07e40e889087fd2e)
+-   User/Repository@SHA: [jlord/sheetsee.js@a5c3785](https://github.com/jlord/sheetsee.js/commit/a5c3785e)
+-   # Num: [#26](https://github.com/wooorm/mdast-github/issues/26)
+-   GH-Num: [GH-26](https://github.com/wooorm/mdast-github/issues/26)
+-   User#Num: [jlord#26](https://github.com/jlord/mdast-github/issues/26)
+-   User/Repository#Num: [jlord/sheetsee.js#26](https://github.com/jlord/sheetsee.js/issues/26)
+-   [@mention](https://github.com/blog/821)
+-   And [@mentioning](https://github.com/mentioning) someone else
+-   And nothing.
+```
+
+## API
+
+### [mdast](https://github.com/wooorm/mdast#api).[use](https://github.com/wooorm/mdast#mdastuseplugin)(github)
+
+Adds references to commits, issues, pull-requests, and users similar to how [GitHub](https://help.github.com/articles/writing-on-github/#references) renders these in issues, comments, and pull request descriptions.
+
+-   SHA commits references: `e2c1dc7690932b0cef900fa4e7355df093448341` — [e2c1dc7](https://github.com/wooorm/mdast-github/commit/e2c1dc7690932b0cef900fa4e7355df093448341)
+-   User@SHA: `wooorm@e2c1dc7690932b0cef900fa4e7355df093448341` — [wooorm@e2c1dc7](https://github.com/wooorm/mdast-github/commit/e2c1dc7690932b0cef900fa4e7355df093448341)
+-   User/Repository@SHA: `wooorm/mdast-github@e2c1dc7690932b0cef900fa4e7355df093448341` — [wooorm/mdast-github@e2c1dc7](https://github.com/wooorm/mdast-github/commit/e2c1dc7690932b0cef900fa4e7355df093448341)
+-   Hash-Num: `#1` — [#1](https://github.com/wooorm/mdast-github/issues/1)
+-   GH-Num: `GH-1` — [GH-1](https://github.com/wooorm/mdast-github/issues/1)
+-   User#Num: `wooorm#1` — [wooorm#1](https://github.com/wooorm/mdast-github/issues/1)
+-   User/Repository#Num: `wooorm/mdast-github#1` — [wooorm/mdast-github#1](https://github.com/wooorm/mdast-github/issues/1)
+-   At-mentions: `@mention` and `@wooorm` — [@mention](https://github.com/blog/821) and [@wooorm](https://github.com/wooorm)
+
+These links are generated relative to a project. In Node this is auto-detected by loading `package.json` and looking for a `repository` field.
+In the browser, or when overwriting this, you can pass a `repository` to [`mdast.parse`](https://github.com/wooorm/mdast#mdastparsevalue-options) or [`mdast.run()`](https://github.com/wooorm/mdast#mdastrunast-options).
+
+## CLI
+
+A simple wrapper around `mdast --use mdast-github`
+
+Install:
+
+```bash
+$ npm install --global mdast-github
+```
+
+Use:
+
+```text
+Usage: mdast-github [mdast options]
+
+Auto-link references like in GitHub issues, PRs, and comments
+
+Options:
+
+  -h, --help            output usage information
+  -v, --version         output version number
+
+A wrapper around `mdast --use mdast-github`
+
+Help for mdast:
+
+  https://github.com/wooorm/mdast
+
+Usage:
+
+# Pass `Readme.md` through mdast-github
+$ mdast-github Readme.md -o Readme.md
+
+# Pass stdin through mdast-github, with mdast options, and write to stdout
+$ cat Docs.md | mdast-github --setting setext > Docs-new.md
+
+# Use other plugins
+$ npm install mdast-usage
+$ mdast-github --use mdast-usage Readme.md
+```
+
+## License
+
+[MIT](LICENSE) © [Titus Wormer](http://wooorm.com)
diff --git a/bower.json b/bower.json
new file mode 100644
index 0000000..dcfcb9c
--- /dev/null
+++ b/bower.json
@@ -0,0 +1,42 @@
+{
+  "name": "mdast-github",
+  "main": "mdast-github.js",
+  "description": "Auto-link references like in GitHub issues, PRs, and comments",
+  "license": "MIT",
+  "keywords": [
+    "text",
+    "markdown",
+    "plain",
+    "text",
+    "table",
+    "of",
+    "contents",
+    "content",
+    "toc",
+    "generation",
+    "mdast"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/wooorm/mdast-github.git"
+  },
+  "authors": [
+    "Titus Wormer <tituswormer@gmail.com>"
+  ],
+  "ignore": [
+    ".*",
+    "*.log",
+    "*.md",
+    "build/",
+    "components/",
+    "coverage/",
+    "node_modules/",
+    "test/",
+    "build.js",
+    "cli.js",
+    "example.js",
+    "index.js",
+    "component.json",
+    "package.json"
+  ]
+}
diff --git a/cli.js b/cli.js
new file mode 100755
index 0000000..3c6612a
--- /dev/null
+++ b/cli.js
@@ -0,0 +1,79 @@
+#!/usr/bin/env node
+'use strict';
+
+/*
+ * Dependencies.
+ */
+
+var spawn = require('win-fork');
+var pack = require('./package.json');
+
+/*
+ * Resolve.
+ */
+
+var mdast = require.resolve('mdast/cli.js');
+var toc = require.resolve('./index.js');
+
+/*
+ * Arguments.
+ */
+
+var argv = process.argv.slice(2);
+
+/*
+ * Command.
+ */
+
+var command = Object.keys(pack.bin)[0];
+
+/*
+ * Program.
+ */
+
+if (argv[0] === '--version' || argv[0] === '-v') {
+    console.log(pack.version);
+} else if (argv[0] === '--help' || argv[0] === '-h') {
+    console.log([
+        '',
+        'Usage: ' + command + ' [mdast options]',
+        '',
+        pack.description,
+        '',
+        'Options:',
+        '',
+        '  -h, --help            output usage information',
+        '  -v, --version         output version number',
+        '',
+        'A wrapper around `mdast --use ' + command + '`',
+        '',
+        'Help for mdast:',
+        '',
+        '  https://github.com/wooorm/mdast',
+        '',
+        'Usage:',
+        '',
+        '# Pass `Readme.md` through ' + command,
+        '$ ' + command + ' Readme.md -o Readme.md',
+        '',
+        '# Pass stdin through ' + command + ', with mdast options, ' +
+            'and write to stdout',
+        '$ cat Docs.md | ' + command + ' --setting setext > Docs-new.md',
+        '',
+        '# Use other plugins',
+        '$ npm install mdast-usage',
+        '$ ' + command + ' --use mdast-usage Readme.md'
+    ].join('\n  ') + '\n');
+} else {
+    var proc = spawn(mdast, ['--use', toc].concat(argv), {
+        'stdio': 'inherit'
+    });
+
+    /*
+     * Exit.
+     */
+
+    proc.on('exit', function (code) {
+        process.exit(code);
+    });
+}
diff --git a/component.json b/component.json
new file mode 100644
index 0000000..84be088
--- /dev/null
+++ b/component.json
@@ -0,0 +1,23 @@
+{
+  "name": "mdast-github",
+  "version": "0.1.0",
+  "description": "Auto-link references like in GitHub issues, PRs, and comments",
+  "license": "MIT",
+  "keywords": [
+    "text",
+    "markdown",
+    "plain",
+    "text",
+    "table",
+    "of",
+    "contents",
+    "content",
+    "toc",
+    "generation",
+    "mdast"
+  ],
+  "repository": "wooorm/mdast-github",
+  "scripts": [
+    "index.js"
+  ]
+}
\ No newline at end of file
diff --git a/example.js b/example.js
new file mode 100644
index 0000000..cc978d1
--- /dev/null
+++ b/example.js
@@ -0,0 +1,22 @@
+// Dependencies and input:
+var github = require('./index.js');
+var mdast = require('mdast').use(github);
+
+var input = [
+    '* SHA: a5c3785ed8d6a35868bc169f07e40e889087fd2e',
+    '* User@SHA: jlord@a5c3785ed8d6a35868bc169f07e40e889087fd2e',
+    '* User/Repository@SHA: jlord/sheetsee.js@a5c3785e',
+    '* #Num: #26',
+    '* GH-Num: GH-26',
+    '* User#Num: jlord#26',
+    '* User/Repository#Num: jlord/sheetsee.js#26',
+    '* @mention',
+    '* And @mentioning someone else',
+    '* And nothing.'
+].join('\n');
+
+// Stringify:
+var doc = mdast.stringify(mdast.parse(input));
+
+// Yields:
+console.log('markdown', doc);
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..8feea5c
--- /dev/null
+++ b/index.js
@@ -0,0 +1,519 @@
+'use strict';
+
+/*
+ * Cached method.
+ */
+
+var splice = Array.prototype.splice;
+var has = Object.prototype.hasOwnProperty;
+
+/*
+ * Hide process use from browserify.
+ */
+var proc = typeof global !== 'undefined' && global.process;
+
+/**
+ * Return a URL to GitHub, relative to an optional
+ * `repo` object, or `user` and `project`.
+ *
+ * @param {Object|string?} repo
+ * @param {string?} project
+ * @return {string}
+ */
+function gh(repo, project) {
+    var base = 'https://github.com/';
+
+    if (project) {
+        repo = {
+            'user': repo,
+            'project': project
+        };
+    }
+
+    if (repo) {
+        base += repo.user + '/' + repo.project + '/';
+    }
+
+    return base;
+}
+
+/*
+ * Username may only contain alphanumeric characters or
+ * single hyphens, and cannot begin or end with a hyphen.
+ *
+ * `PERSON` is either a user or a team, but also matches a team:
+ * https://github.com/blog/1121-introducing-team-mentions
+ */
+
+var NAME = '(?:[a-z0-9]{1,2}|[a-z0-9][a-z0-9-]{1,37}[a-z0-9])';
+var USER = '(' + NAME + ')';
+var PERSON = '(' + NAME + '(?:\\/' + NAME + ')?)';
+var SHA = '([a-f0-9]{7,40})';
+var NUMBER = '([0-9]+)';
+var PROJECT = '((?:[a-z0-9-]|\\.git[a-z0-9-]|\\.(?!git))+)';
+var ISSUE = '(?:GH-|#)' + NUMBER;
+var REPO = USER + '\\/' + PROJECT;
+
+var EXPRESSION_SHA = new RegExp(
+    '^' + SHA + '\\b', 'gi'
+);
+
+var EXPRESSION_USER_SHA = new RegExp(
+    '^' + USER + '@' + SHA + '\\b', 'gi'
+);
+
+var EXPRESSION_REPO_SHA = new RegExp(
+    '^' + REPO + '@' + SHA + '\\b', 'gi'
+);
+
+var EXPRESSION_ISSUE = new RegExp(
+    '^' + ISSUE + '\\b', 'gi'
+);
+
+var EXPRESSION_USER_ISSUE = new RegExp(
+    '^' + USER + '#' + NUMBER + '\\b', 'gi'
+);
+
+var EXPRESSION_REPO_ISSUE = new RegExp(
+    '^' + REPO + '#' + NUMBER + '\\b', 'gi'
+);
+
+var EXPRESSION_MENTION = new RegExp(
+    '^@' + PERSON + '\\b(?!-)', 'gi'
+);
+
+var EXPRESSIONS_REPO = new RegExp(
+    '(?:^|/(?:repos/)?)' + REPO + '(?=\\.git|[\\/#@]|$)', 'i'
+);
+
+var EXPRESSIONS_WHITE_SPACE = new RegExp('\\s');
+
+/*
+ * Expressions to use.
+ */
+
+var expressions = {
+    'sha': EXPRESSION_SHA,
+    'userSHA': EXPRESSION_USER_SHA,
+    'repoSHA': EXPRESSION_REPO_SHA,
+    'issue': EXPRESSION_ISSUE,
+    'userIssue': EXPRESSION_USER_ISSUE,
+    'repoIssue': EXPRESSION_REPO_ISSUE,
+    'mention': EXPRESSION_MENTION
+};
+
+var order = [
+    'repoSHA',
+    'userSHA',
+    'sha',
+    'repoIssue',
+    'userIssue',
+    'issue',
+    'mention'
+];
+
+/*
+ * Blacklist of SHAs which are also valid words.
+ *
+ * GitHub allows abbreviating SHAs up to 7 characters.
+ *
+ * Generated by:
+ *
+ *     egrep -i "^[a-f0-9]{7,}$" /usr/share/dict/words
+ */
+
+var BLACKLIST = [
+    'deedeed',
+    'fabaceae'
+];
+
+/**
+ * Check if a value is a SHA.
+ *
+ * @param {string} sha
+ * @return {boolean}
+ */
+function isSHA(sha) {
+    return BLACKLIST.indexOf(sha.toLowerCase()) === -1;
+}
+
+/**
+ * Abbreviate a SHA.
+ *
+ * @param {string} sha
+ * @return {string}
+ */
+function abbr(sha) {
+    return sha.slice(0, 7);
+}
+
+/**
+ * Check if a node is a text node.
+ *
+ * @param {Node} node
+ * @return {boolean}
+ */
+function isText(node) {
+    return node && node.type === 'text';
+}
+
+/**
+ * Render a link node.
+ *
+ * @param {Object} position
+ * @param {string} href
+ * @param {Array.<Node>} children
+ * @return {Node}
+ */
+function link(position, href, children) {
+    return {
+        'type': 'link',
+        'href': href,
+        'title': null,
+        'children': children,
+        'position': position
+    };
+}
+
+/**
+ * Render a text node.
+ *
+ * @param {Object} position
+ * @param {string} value
+ * @return {Node}
+ */
+function text(position, value) {
+    return {
+        'type': 'text',
+        'value': value,
+        'position': position
+    };
+}
+
+/**
+ * Find references in a text node, and return a list
+ * of replacement nodes.
+ *
+ * @param {Node} parent
+ * @param {Object} repo
+ * @return {Array.<Node>}
+ */
+function augment(parent, repo) {
+    var value = parent.value;
+    var valueLength = value.length;
+    var nodes = [];
+    var length = order.length;
+    var index = -1;
+    var offset = -1;
+    var node;
+    var name;
+    var match;
+    var subposition;
+    var start = 0;
+    var end = 0;
+    var position = parent.position ? parent.position.start : {};
+    var line = position.line || 1;
+    var column = position.column || 1;
+
+    /**
+     * Get the current position.
+     *
+     * @return {Object}
+     */
+    function now() {
+        return {
+            'line': line,
+            'column': column
+        };
+    }
+
+    /**
+     * Location getter.
+     *
+     * @return {function(): Object}
+     */
+    function location() {
+        var before = now();
+
+        /**
+         * Return a `position`.
+         *
+         * @return {Object}
+         */
+        return function () {
+            return {
+                'start': before,
+                'end': now()
+            };
+        };
+    }
+
+    position = location();
+
+    while (++offset < valueLength) {
+        index = -1;
+
+        if (
+            offset === 0 ||
+            EXPRESSIONS_WHITE_SPACE.test(value.charAt(offset - 1))
+        ) {
+            while (++index < length) {
+                name = order[index];
+
+                match = expressions[name].exec(value.slice(offset));
+
+                expressions[name].lastIndex = 0;
+
+                if (match) {
+                    subposition = location();
+
+                    end = offset;
+
+                    offset += match[0].length;
+
+                    node = augment[name].apply(
+                        null, [subposition(), repo].concat(match)
+                    );
+
+                    if (node) {
+                        if (end !== start) {
+                            nodes.push(text(
+                                position(), value.slice(start, end)
+                            ));
+
+                            position = location();
+                        }
+
+                        start = offset;
+                        nodes.push(node);
+                    }
+                }
+            }
+        }
+
+        if (value.charAt(index) === '\n') {
+            line++;
+            column = 0;
+        }
+
+        column++;
+    }
+
+    if (start < valueLength) {
+        nodes.push(text(position(), value.slice(start, offset)));
+    }
+
+    return nodes;
+}
+
+/**
+ * Render a SHA relative to a repo.
+ *
+ * @param {Object} position
+ * @param {Object} repo
+ * @param {string} $0 - Whole content.
+ * @param {Object} $1 - Username.
+ * @param {Object} $2 - Project.
+ * @param {Object} $3 - SHA.
+ * @return {Node?}
+ */
+augment.repoSHA = function (position, repo, $0, $1, $2, $3) {
+    var href;
+    var value;
+
+    if (isSHA($3)) {
+        href = gh($1, $2) + 'commit/' + $3;
+        value = $1 + '/' + $2 + '@' + abbr($3);
+
+        return link(position, href, [text(position, value)]);
+    }
+};
+
+/**
+ * Render a SHA relative to a user.
+ *
+ * @param {Object} position
+ * @param {Object} repo
+ * @param {string} $0 - Whole content.
+ * @param {Object} $1 - Username.
+ * @param {Object} $2 - SHA.
+ * @return {Node?}
+ */
+augment.userSHA = function (position, repo, $0, $1, $2) {
+    var href;
+    var value;
+
+    if (isSHA($2)) {
+        href = gh($1, repo.project) + 'commit/' + $2;
+        value = $1 + '@' + abbr($2);
+
+        return link(position, href, [text(position, value)]);
+    }
+};
+
+/**
+ * Render a SHA.
+ *
+ * @param {Object} position
+ * @param {Object} repo
+ * @param {string} $0 - Whole content.
+ * @param {Object} $1 - SHA.
+ * @return {Node?}
+ */
+augment.sha = function (position, repo, $0, $1) {
+    var href;
+
+    if (isSHA($1)) {
+        href = gh(repo) + 'commit/' + $1;
+
+        return link(position, href, [text(position, abbr($0))]);
+    }
+};
+
+/**
+ * Render an issue relative to a repo.
+ *
+ * @param {Object} position
+ * @param {Object} repo
+ * @param {string} $0 - Whole content.
+ * @param {Object} $1 - Username.
+ * @param {Object} $2 - Project.
+ * @param {Object} $3 - Issue number.
+ * @return {Node}
+ */
+augment.repoIssue = function (position, repo, $0, $1, $2, $3) {
+    var href = gh($1, $2) + 'issues/' + $3;
+
+    return link(position, href, [text(position, $0)]);
+};
+
+/**
+ * Render an issue relative to a user.
+ *
+ * @param {Object} position
+ * @param {Object} repo
+ * @param {string} $0 - Whole content.
+ * @param {Object} $1 - Username.
+ * @param {Object} $2 - Issue number.
+ * @return {Node}
+ */
+augment.userIssue = function (position, repo, $0, $1, $2) {
+    var href = gh($1, repo.project) + 'issues/' + $2;
+
+    return link(position, href, [text(position, $0)]);
+};
+
+/**
+ * Render an issue.
+ *
+ * @param {Object} position
+ * @param {Object} repo
+ * @param {string} $0 - Whole content.
+ * @param {Object} $1 - Issue number.
+ * @return {Node}
+ */
+augment.issue = function (position, repo, $0, $1) {
+    var href = gh(repo) + 'issues/' + $1;
+
+    return link(position, href, [text(position, $0)]);
+};
+
+var OVERWRITES = {};
+
+OVERWRITES.mentions = OVERWRITES.mention = 'blog/821';
+
+/**
+ * Render a mention.
+ *
+ * @param {Object} position
+ * @param {Object} repo
+ * @param {string} $0 - Whole content.
+ * @param {Object} $1 - Username.
+ * @return {Node}
+ */
+augment.mention = function (position, repo, $0, $1) {
+    var href = gh() + (has.call(OVERWRITES, $1) ? OVERWRITES[$1] : $1);
+
+    return link(position, href, [text(position, $0)]);
+};
+
+/**
+ * Adds an example section based on a valid example
+ * JavaScript document to a `Usage` section.
+ *
+ * @param {Node} node
+ */
+function github(node, options) {
+    var repo = options.repository;
+    var pack;
+
+    if (!repo) {
+        try {
+            pack = require(require('path').resolve(
+                proc.cwd(), 'package.json'
+            ));
+        } catch (exception) {
+            pack = {};
+        }
+
+        repo = pack.repository ? pack.repository.url || pack.repository : '';
+    }
+
+    repo = EXPRESSIONS_REPO.exec(repo);
+
+    EXPRESSIONS_REPO.lastIndex = 0;
+
+    if (!repo) {
+        throw new Error('Missing `repository` field in `options`');
+    }
+
+    repo = {
+        'user': repo[1],
+        'project': repo[2]
+    };
+
+    /**
+     * Replace a text node with results from `augment`.
+     *
+     * @param {Node} child
+     * @param {number} position
+     * @param {Array.<Node>} children
+     */
+    function replace(child, position, children) {
+        splice.apply(children, [position, 1].concat(augment(child, repo)));
+    }
+
+    var visit;
+    var visitAll;
+
+    /**
+     * Visit `node`.  Returns zero or more text blocks.
+     *
+     * @param {Node} child
+     */
+    visit = function (child, position, children) {
+        if (isText(child)) {
+            replace(child, position, children);
+        } else if ('children' in child && child.type !== 'link') {
+            visitAll(child.children);
+        }
+    };
+
+    /**
+     * Visit all `children`.  Returns a single nested
+     * array.
+     *
+     * @param {Array.<Node>} children
+     */
+    visitAll = function (children) {
+        children.map(visit);
+    };
+
+    visit(node);
+}
+
+/*
+ * Expose `github`.
+ */
+
+module.exports = github;
diff --git a/mdast-github.js b/mdast-github.js
new file mode 100644
index 0000000..18ab250
--- /dev/null
+++ b/mdast-github.js
@@ -0,0 +1,525 @@
+(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.mdastGitHub = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+(function (global){
+'use strict';
+
+/*
+ * Cached method.
+ */
+
+var splice = Array.prototype.splice;
+var has = Object.prototype.hasOwnProperty;
+
+/*
+ * Hide process use from browserify.
+ */
+var proc = typeof global !== 'undefined' && global.process;
+
+/**
+ * Return a URL to GitHub, relative to an optional
+ * `repo` object, or `user` and `project`.
+ *
+ * @param {Object|string?} repo
+ * @param {string?} project
+ * @return {string}
+ */
+function gh(repo, project) {
+    var base = 'https://github.com/';
+
+    if (project) {
+        repo = {
+            'user': repo,
+            'project': project
+        };
+    }
+
+    if (repo) {
+        base += repo.user + '/' + repo.project + '/';
+    }
+
+    return base;
+}
+
+/*
+ * Username may only contain alphanumeric characters or
+ * single hyphens, and cannot begin or end with a hyphen.
+ *
+ * `PERSON` is either a user or a team, but also matches a team:
+ * https://github.com/blog/1121-introducing-team-mentions
+ */
+
+var NAME = '(?:[a-z0-9]{1,2}|[a-z0-9][a-z0-9-]{1,37}[a-z0-9])';
+var USER = '(' + NAME + ')';
+var PERSON = '(' + NAME + '(?:\\/' + NAME + ')?)';
+var SHA = '([a-f0-9]{7,40})';
+var NUMBER = '([0-9]+)';
+var PROJECT = '((?:[a-z0-9-]|\\.git[a-z0-9-]|\\.(?!git))+)';
+var ISSUE = '(?:GH-|#)' + NUMBER;
+var REPO = USER + '\\/' + PROJECT;
+
+var EXPRESSION_SHA = new RegExp(
+    '^' + SHA + '\\b', 'gi'
+);
+
+var EXPRESSION_USER_SHA = new RegExp(
+    '^' + USER + '@' + SHA + '\\b', 'gi'
+);
+
+var EXPRESSION_REPO_SHA = new RegExp(
+    '^' + REPO + '@' + SHA + '\\b', 'gi'
+);
+
+var EXPRESSION_ISSUE = new RegExp(
+    '^' + ISSUE + '\\b', 'gi'
+);
+
+var EXPRESSION_USER_ISSUE = new RegExp(
+    '^' + USER + '#' + NUMBER + '\\b', 'gi'
+);
+
+var EXPRESSION_REPO_ISSUE = new RegExp(
+    '^' + REPO + '#' + NUMBER + '\\b', 'gi'
+);
+
+var EXPRESSION_MENTION = new RegExp(
+    '^@' + PERSON + '\\b(?!-)', 'gi'
+);
+
+var EXPRESSIONS_REPO = new RegExp(
+    '(?:^|/(?:repos/)?)' + REPO + '(?=\\.git|[\\/#@]|$)', 'i'
+);
+
+var EXPRESSIONS_WHITE_SPACE = new RegExp('\\s');
+
+/*
+ * Expressions to use.
+ */
+
+var expressions = {
+    'sha': EXPRESSION_SHA,
+    'userSHA': EXPRESSION_USER_SHA,
+    'repoSHA': EXPRESSION_REPO_SHA,
+    'issue': EXPRESSION_ISSUE,
+    'userIssue': EXPRESSION_USER_ISSUE,
+    'repoIssue': EXPRESSION_REPO_ISSUE,
+    'mention': EXPRESSION_MENTION
+};
+
+var order = [
+    'repoSHA',
+    'userSHA',
+    'sha',
+    'repoIssue',
+    'userIssue',
+    'issue',
+    'mention'
+];
+
+/*
+ * Blacklist of SHAs which are also valid words.
+ *
+ * GitHub allows abbreviating SHAs up to 7 characters.
+ *
+ * Generated by:
+ *
+ *     egrep -i "^[a-f0-9]{7,}$" /usr/share/dict/words
+ */
+
+var BLACKLIST = [
+    'deedeed',
+    'fabaceae'
+];
+
+/**
+ * Check if a value is a SHA.
+ *
+ * @param {string} sha
+ * @return {boolean}
+ */
+function isSHA(sha) {
+    return BLACKLIST.indexOf(sha.toLowerCase()) === -1;
+}
+
+/**
+ * Abbreviate a SHA.
+ *
+ * @param {string} sha
+ * @return {string}
+ */
+function abbr(sha) {
+    return sha.slice(0, 7);
+}
+
+/**
+ * Check if a node is a text node.
+ *
+ * @param {Node} node
+ * @return {boolean}
+ */
+function isText(node) {
+    return node && node.type === 'text';
+}
+
+/**
+ * Render a link node.
+ *
+ * @param {Object} position
+ * @param {string} href
+ * @param {Array.<Node>} children
+ * @return {Node}
+ */
+function link(position, href, children) {
+    return {
+        'type': 'link',
+        'href': href,
+        'title': null,
+        'children': children,
+        'position': position
+    };
+}
+
+/**
+ * Render a text node.
+ *
+ * @param {Object} position
+ * @param {string} value
+ * @return {Node}
+ */
+function text(position, value) {
+    return {
+        'type': 'text',
+        'value': value,
+        'position': position
+    };
+}
+
+/**
+ * Find references in a text node, and return a list
+ * of replacement nodes.
+ *
+ * @param {Node} parent
+ * @param {Object} repo
+ * @return {Array.<Node>}
+ */
+function augment(parent, repo) {
+    var value = parent.value;
+    var valueLength = value.length;
+    var nodes = [];
+    var length = order.length;
+    var index = -1;
+    var offset = -1;
+    var node;
+    var name;
+    var match;
+    var subposition;
+    var start = 0;
+    var end = 0;
+    var position = parent.position ? parent.position.start : {};
+    var line = position.line || 1;
+    var column = position.column || 1;
+
+    /**
+     * Get the current position.
+     *
+     * @return {Object}
+     */
+    function now() {
+        return {
+            'line': line,
+            'column': column
+        };
+    }
+
+    /**
+     * Location getter.
+     *
+     * @return {function(): Object}
+     */
+    function location() {
+        var before = now();
+
+        /**
+         * Return a `position`.
+         *
+         * @return {Object}
+         */
+        return function () {
+            return {
+                'start': before,
+                'end': now()
+            };
+        };
+    }
+
+    position = location();
+
+    while (++offset < valueLength) {
+        index = -1;
+
+        if (
+            offset === 0 ||
+            EXPRESSIONS_WHITE_SPACE.test(value.charAt(offset - 1))
+        ) {
+            while (++index < length) {
+                name = order[index];
+
+                match = expressions[name].exec(value.slice(offset));
+
+                expressions[name].lastIndex = 0;
+
+                if (match) {
+                    subposition = location();
+
+                    end = offset;
+
+                    offset += match[0].length;
+
+                    node = augment[name].apply(
+                        null, [subposition(), repo].concat(match)
+                    );
+
+                    if (node) {
+                        if (end !== start) {
+                            nodes.push(text(
+                                position(), value.slice(start, end)
+                            ));
+
+                            position = location();
+                        }
+
+                        start = offset;
+                        nodes.push(node);
+                    }
+                }
+            }
+        }
+
+        if (value.charAt(index) === '\n') {
+            line++;
+            column = 0;
+        }
+
+        column++;
+    }
+
+    if (start < valueLength) {
+        nodes.push(text(position(), value.slice(start, offset)));
+    }
+
+    return nodes;
+}
+
+/**
+ * Render a SHA relative to a repo.
+ *
+ * @param {Object} position
+ * @param {Object} repo
+ * @param {string} $0 - Whole content.
+ * @param {Object} $1 - Username.
+ * @param {Object} $2 - Project.
+ * @param {Object} $3 - SHA.
+ * @return {Node?}
+ */
+augment.repoSHA = function (position, repo, $0, $1, $2, $3) {
+    var href;
+    var value;
+
+    if (isSHA($3)) {
+        href = gh($1, $2) + 'commit/' + $3;
+        value = $1 + '/' + $2 + '@' + abbr($3);
+
+        return link(position, href, [text(position, value)]);
+    }
+};
+
+/**
+ * Render a SHA relative to a user.
+ *
+ * @param {Object} position
+ * @param {Object} repo
+ * @param {string} $0 - Whole content.
+ * @param {Object} $1 - Username.
+ * @param {Object} $2 - SHA.
+ * @return {Node?}
+ */
+augment.userSHA = function (position, repo, $0, $1, $2) {
+    var href;
+    var value;
+
+    if (isSHA($2)) {
+        href = gh($1, repo.project) + 'commit/' + $2;
+        value = $1 + '@' + abbr($2);
+
+        return link(position, href, [text(position, value)]);
+    }
+};
+
+/**
+ * Render a SHA.
+ *
+ * @param {Object} position
+ * @param {Object} repo
+ * @param {string} $0 - Whole content.
+ * @param {Object} $1 - SHA.
+ * @return {Node?}
+ */
+augment.sha = function (position, repo, $0, $1) {
+    var href;
+
+    if (isSHA($1)) {
+        href = gh(repo) + 'commit/' + $1;
+
+        return link(position, href, [text(position, abbr($0))]);
+    }
+};
+
+/**
+ * Render an issue relative to a repo.
+ *
+ * @param {Object} position
+ * @param {Object} repo
+ * @param {string} $0 - Whole content.
+ * @param {Object} $1 - Username.
+ * @param {Object} $2 - Project.
+ * @param {Object} $3 - Issue number.
+ * @return {Node}
+ */
+augment.repoIssue = function (position, repo, $0, $1, $2, $3) {
+    var href = gh($1, $2) + 'issues/' + $3;
+
+    return link(position, href, [text(position, $0)]);
+};
+
+/**
+ * Render an issue relative to a user.
+ *
+ * @param {Object} position
+ * @param {Object} repo
+ * @param {string} $0 - Whole content.
+ * @param {Object} $1 - Username.
+ * @param {Object} $2 - Issue number.
+ * @return {Node}
+ */
+augment.userIssue = function (position, repo, $0, $1, $2) {
+    var href = gh($1, repo.project) + 'issues/' + $2;
+
+    return link(position, href, [text(position, $0)]);
+};
+
+/**
+ * Render an issue.
+ *
+ * @param {Object} position
+ * @param {Object} repo
+ * @param {string} $0 - Whole content.
+ * @param {Object} $1 - Issue number.
+ * @return {Node}
+ */
+augment.issue = function (position, repo, $0, $1) {
+    var href = gh(repo) + 'issues/' + $1;
+
+    return link(position, href, [text(position, $0)]);
+};
+
+var OVERWRITES = {};
+
+OVERWRITES.mentions = OVERWRITES.mention = 'blog/821';
+
+/**
+ * Render a mention.
+ *
+ * @param {Object} position
+ * @param {Object} repo
+ * @param {string} $0 - Whole content.
+ * @param {Object} $1 - Username.
+ * @return {Node}
+ */
+augment.mention = function (position, repo, $0, $1) {
+    var href = gh() + (has.call(OVERWRITES, $1) ? OVERWRITES[$1] : $1);
+
+    return link(position, href, [text(position, $0)]);
+};
+
+/**
+ * Adds an example section based on a valid example
+ * JavaScript document to a `Usage` section.
+ *
+ * @param {Node} node
+ */
+function github(node, options) {
+    var repo = options.repository;
+    var pack;
+
+    if (!repo) {
+        try {
+            pack = require(require('path').resolve(
+                proc.cwd(), 'package.json'
+            ));
+        } catch (exception) {
+            pack = {};
+        }
+
+        repo = pack.repository ? pack.repository.url || pack.repository : '';
+    }
+
+    repo = EXPRESSIONS_REPO.exec(repo);
+
+    EXPRESSIONS_REPO.lastIndex = 0;
+
+    if (!repo) {
+        throw new Error('Missing `repository` field in `options`');
+    }
+
+    repo = {
+        'user': repo[1],
+        'project': repo[2]
+    };
+
+    /**
+     * Replace a text node with results from `augment`.
+     *
+     * @param {Node} child
+     * @param {number} position
+     * @param {Array.<Node>} children
+     */
+    function replace(child, position, children) {
+        splice.apply(children, [position, 1].concat(augment(child, repo)));
+    }
+
+    var visit;
+    var visitAll;
+
+    /**
+     * Visit `node`.  Returns zero or more text blocks.
+     *
+     * @param {Node} child
+     */
+    visit = function (child, position, children) {
+        if (isText(child)) {
+            replace(child, position, children);
+        } else if ('children' in child && child.type !== 'link') {
+            visitAll(child.children);
+        }
+    };
+
+    /**
+     * Visit all `children`.  Returns a single nested
+     * array.
+     *
+     * @param {Array.<Node>} children
+     */
+    visitAll = function (children) {
+        children.map(visit);
+    };
+
+    visit(node);
+}
+
+/*
+ * Expose `github`.
+ */
+
+module.exports = github;
+
+}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{"path":undefined}]},{},[1])(1)
+});
\ No newline at end of file
diff --git a/mdast-github.min.js b/mdast-github.min.js
new file mode 100644
index 0000000..05ee230
--- /dev/null
+++ b/mdast-github.min.js
@@ -0,0 +1 @@
+!function(b,a){typeof exports==='object'&&typeof module!=='undefined'?module.exports=b():typeof define==='function'&&define.amd?define([],b):(typeof window!=='undefined'?a=window:typeof global!=='undefined'?a=global:typeof self!=='undefined'?a=self:a=this,a.mdastGitHub=b())}(function(){return function a(b,c,e){function f(d,k){if(!c[d]){if(!b[d]){var i=typeof require=='function'&&require;if(!k&&i)return i(d,!0);if(g)return g(d,!0);var j=new Error("Cannot find module '"+d+"'");throw j.code='MODULE_NOT_FOUND',j}var h=c[d]={exports:{}};b[d][0].call(h.exports,function(c){var a=b[d][1][c];return f(a?a:c)},h,h.exports,a,b,c,e)}return c[d].exports}var g=typeof require=='function'&&require;for(var d=0;d<e.length;d++)f(e[d]);return f}({1:[function(a,b,c){(function(t){'use strict';function e(a,c){var b='https://github.com/';return c&&(a={user:a,project:c}),a&&(b+=a.user+'/'+a.project+'/'),b}function o(a){return w.indexOf(a.toLowerCase())===-1}function n(a){return a.slice(0,7)}function H(a){return a&&a.type==='text'}function f(a,b,c){return{type:'link',href:b,title:null,children:c,position:a}}function c(a,b){return{type:'text',value:b,position:a}}function d(n,w){function v(){return{line:s,column:j}}function r(){var a=v();return function(){return{start:a,end:v()}}}var e=n.value,p=e.length,g=[],t=m.length,h=-1,a=-1,o,k,i,u,f=0,l=0,b=n.position?n.position.start:{},s=b.line||1,j=b.column||1;b=r();while(++a<p){if(h=-1,a===0||F.test(e.charAt(a-1)))while(++h<t)k=m[h],i=q[k].exec(e.slice(a)),q[k].lastIndex=0,i&&(u=r(),l=a,a+=i[0].length,o=d[k].apply(null,[u(),w].concat(i)),o)&&(l!==f&&(g.push(c(b(),e.slice(f,l))),b=r()),f=a,g.push(o));e.charAt(h)==='\n'&&(s++,j=0),j++}return f<p&&g.push(c(b(),e.slice(f,a))),g}function I(g,h){function i(a,c,e){E.apply(e,[c,1].concat(d(a,b)))}var b=h.repository,c;if(!b){try{c=a(a('path').resolve(s.cwd(),'package.json'))}catch(a){c={}}b=c.repository?c.repository.url||c.repository:''}if(b=p.exec(b),p.lastIndex=0,!b)throw new Error('Missing `repository` field in `options`');b={user:b[1],project:b[2]};var e,f;e=function(a,b,c){H(a)?i(a,b,c):'children'in a&&a.type!=='link'&&f(a.children)},f=function(a){a.map(e)},e(g)}var E=Array.prototype.splice,y=Object.prototype.hasOwnProperty,s=t!==void 0&&t.process,l='(?:[a-z0-9]{1,2}|[a-z0-9][a-z0-9-]{1,37}[a-z0-9])',h='('+l+')',G='('+l+'(?:\\/'+l+')?)',k='([a-f0-9]{7,40})',i='([0-9]+)',u='((?:[a-z0-9-]|\\.git[a-z0-9-]|\\.(?!git))+)',v='(?:GH-|#)'+i,j=h+'\\/'+u,x=new RegExp('^'+k+'\\b','gi'),r=new RegExp('^'+h+'@'+k+'\\b','gi'),z=new RegExp('^'+j+'@'+k+'\\b','gi'),A=new RegExp('^'+v+'\\b','gi'),B=new RegExp('^'+h+'#'+i+'\\b','gi'),C=new RegExp('^'+j+'#'+i+'\\b','gi'),D=new RegExp('^@'+G+'\\b(?!-)','gi'),p=new RegExp('(?:^|/(?:repos/)?)'+j+'(?=\\.git|[\\/#@]|$)','i'),F=new RegExp('\\s'),q={sha:x,userSHA:r,repoSHA:z,issue:A,userIssue:B,repoIssue:C,mention:D},m=['repoSHA','userSHA','sha','repoIssue','userIssue','issue','mention'],w=['deedeed','fabaceae'];d.repoSHA=function(b,j,k,d,g,a){var h,i;return o(a)?(h=e(d,g)+'commit/'+a,i=d+'/'+g+'@'+n(a),f(b,h,[c(b,i)])):void 0},d.userSHA=function(b,i,j,d,a){var g,h;return o(a)?(g=e(d,i.project)+'commit/'+a,h=d+'@'+n(a),f(b,g,[c(b,h)])):void 0},d.sha=function(a,g,h,b){var d;return o(b)?(d=e(g)+'commit/'+b,f(a,d,[c(a,n(h))])):void 0},d.repoIssue=function(a,j,d,g,h,i){var b=e(g,h)+'issues/'+i;return f(a,b,[c(a,d)])},d.userIssue=function(a,d,g,h,i){var b=e(h,d.project)+'issues/'+i;return f(a,b,[c(a,g)])},d.issue=function(a,d,g,h){var b=e(d)+'issues/'+h;return f(a,b,[c(a,g)])};var g={};g.mentions=g.mention='blog/821',d.mention=function(b,i,h,a){var d=e()+(y.call(g,a)?g[a]:a);return f(b,d,[c(b,h)])},b.exports=I}.call(this,typeof global!=='undefined'?global:typeof self!=='undefined'?self:typeof window!=='undefined'?window:{}))},{path:undefined}]},{},[1])(1)})
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..99be757
--- /dev/null
+++ b/package.json
@@ -0,0 +1,68 @@
+{
+  "name": "mdast-github",
+  "version": "0.1.0",
+  "description": "Auto-link references like in GitHub issues, PRs, and comments",
+  "license": "MIT",
+  "keywords": [
+    "writing",
+    "on",
+    "github",
+    "sha",
+    "user",
+    "issue",
+    "mention",
+    "pull",
+    "request",
+    "reference",
+    "mdast"
+  ],
+  "dependencies": {
+    "win-fork": "^1.0.0"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/wooorm/mdast-github.git"
+  },
+  "author": "Titus Wormer <tituswormer@gmail.com>",
+  "bin": {
+    "mdast-github": "cli.js"
+  },
+  "peerDependencies": {
+    "mdast": ">=0.11.0"
+  },
+  "devDependencies": {
+    "browserify": "^9.0.0",
+    "chalk": "^1.0.0",
+    "diff": "^1.2.2",
+    "eslint": "^0.17.0",
+    "esmangle": "^1.0.0",
+    "istanbul": "^0.3.0",
+    "jscs": "^1.0.0",
+    "jscs-jsdoc": "^0.4.0",
+    "mdast": "^0.12.0",
+    "mdast-toc": "^0.1.1",
+    "mdast-usage": "^0.1.0",
+    "mocha": "^2.0.0"
+  },
+  "scripts": {
+    "test-api": "mocha --check-leaks test/index.js",
+    "test-cli": "bash test/cli.sh",
+    "test-coveralls": "istanbul cover _mocha --report lcovonly -- --check-leaks test/index.js",
+    "test-coverage": "istanbul cover _mocha -- test/index.js",
+    "test-travis": "npm run test-coveralls && npm run test-cli",
+    "test": "npm run test-api && npm run test-cli",
+    "lint-api": "eslint index.js",
+    "lint-cli": "eslint --rule no-process-exit:false cli.js",
+    "lint-test": "eslint --env mocha test/index.js",
+    "lint-script": "eslint example.js",
+    "lint-style": "jscs --reporter inline index.js cli.js example.js test/index.js",
+    "lint": "npm run lint-api && npm run lint-cli && npm run lint-test && npm run lint-script && npm run lint-style",
+    "make": "npm run lint && npm run test-coverage",
+    "bundle": "browserify --no-builtins index.js -s mdastGitHub > mdast-github.js",
+    "postbundle": "esmangle mdast-github.js > mdast-github.min.js",
+    "build-readme": "mdast --use mdast-toc --use mdast-usage --use index.js -o Readme.md Readme.md",
+    "build-history": "mdast --use index.js -o History.md History.md",
+    "build": "npm run bundle && npm run build-readme && npm run build-history",
+    "prepublish": "npm run build"
+  }
+}
diff --git a/test/cli.sh b/test/cli.sh
new file mode 100755
index 0000000..f3fc303
--- /dev/null
+++ b/test/cli.sh
@@ -0,0 +1,72 @@
+#!/bin/sh
+#!/bin/bash
+
+typeset -i tests=0
+
+function it {
+    let tests+=1;
+    description="$1";
+}
+
+function assert {
+    if [[ "$1" == "$2" ]]; then
+        printf "\033[32m.\033[0m";
+    else
+        printf "\033[31m\nFAIL: $description\033[0m: '$1' != '$2'\n";
+        exit 1
+    fi
+}
+
+it "Should accept a file"
+    code=0
+    ./cli.js Readme.md > /dev/null 2>&1 || code=$?
+    assert $code 0
+
+it "Should accept stdin"
+    code=0
+    cat History.md | ./cli.js > /dev/null 2>&1 || code=$?
+    assert $code 0
+
+it "Should fail without input"
+    code=0
+    ./cli.js > /dev/null 2>&1 || code=$?
+    assert $code 1
+
+it "Should fail on an invalid file"
+    code=0
+    ./cli.js some-other-file.md > /dev/null 2>&1 || code=$?
+    assert $code 1
+
+it "Should fail on multiple files"
+    code=0
+    ./cli.js History.md Readme.md > /dev/null 2>&1 || code=$?
+    assert $code 1
+
+it "Should fail on stdin and files"
+    code=0
+    cat History.md | ./cli.js Readme.md > /dev/null 2>&1 || code=$?
+    assert $code 1
+
+it "Should accept \`--help\`"
+    code=0
+    ./cli.js --help > /dev/null 2>&1 || code=$?
+    assert $code 0
+
+it "Should accept \`-h\`"
+    code=0
+    ./cli.js -h > /dev/null 2>&1 || code=$?
+    assert $code 0
+
+it "Should accept \`--version\`"
+    code=0
+    ./cli.js --version > /dev/null 2>&1 || code=$?
+    assert $code 0
+
+it "Should accept \`-v\`"
+    code=0
+    ./cli.js -v > /dev/null 2>&1 || code=$?
+    assert $code 0
+
+printf "\033[32m\n(✓) Passed $tests assertions without errors\033[0m\n";
+
+exit 0
diff --git a/test/fixtures/issue-project/Input.md b/test/fixtures/issue-project/Input.md
new file mode 100644
index 0000000..636db25
--- /dev/null
+++ b/test/fixtures/issue-project/Input.md
@@ -0,0 +1,20 @@
+# User@Project
+
+A project-SHA is not relative to the current project.
+
+GitHub’s project names can include alphabetical characters, dashes, and full-stops. They may end in a TLD (such as `.com`), but may not end in `.git` (for obvious reasons).
+
+-   This is a valid issue: wooorm/mdast#1;
+-   So is this: wooorm/mdast#123456789.
+
+They work here
+wooorm/mdast#1
+
+and here
+    wooorm/mdast#1
+
+Usernames: this is not a valid, -wooorm/mdast#1; nor is this wooorm-/mdast#1; but this is w-w/mdast#1, and so is w/mdast#1 and ww/mdast#1.
+
+Project names: this is not a valid, wooorm/c.git#1; but this is wooorm/c#1, so is w/w#1, and ww/.gitconfig#1.
+
+This is too long: wooormwooormwooormwooormwooormwooormwooo/c#1 (40 character username).
diff --git a/test/fixtures/issue-project/Output.md b/test/fixtures/issue-project/Output.md
new file mode 100644
index 0000000..b4a296a
--- /dev/null
+++ b/test/fixtures/issue-project/Output.md
@@ -0,0 +1,20 @@
+# User@Project
+
+A project-SHA is not relative to the current project.
+
+GitHub’s project names can include alphabetical characters, dashes, and full-stops. They may end in a TLD (such as `.com`), but may not end in `.git` (for obvious reasons).
+
+-   This is a valid issue: [wooorm/mdast#1](https://github.com/wooorm/mdast/issues/1);
+-   So is this: [wooorm/mdast#123456789](https://github.com/wooorm/mdast/issues/123456789).
+
+They work here
+[wooorm/mdast#1](https://github.com/wooorm/mdast/issues/1)
+
+and here
+    [wooorm/mdast#1](https://github.com/wooorm/mdast/issues/1)
+
+Usernames: this is not a valid, -wooorm/mdast#1; nor is this wooorm-/mdast#1; but this is [w-w/mdast#1](https://github.com/w-w/mdast/issues/1), and so is [w/mdast#1](https://github.com/w/mdast/issues/1) and [ww/mdast#1](https://github.com/ww/mdast/issues/1).
+
+Project names: this is not a valid, wooorm/c.git#1; but this is [wooorm/c#1](https://github.com/wooorm/c/issues/1), so is [w/w#1](https://github.com/w/w/issues/1), and [ww/.gitconfig#1](https://github.com/ww/.gitconfig/issues/1).
+
+This is too long: wooormwooormwooormwooormwooormwooormwooo/c#1 (40 character username).
diff --git a/test/fixtures/issue-user/Input.md b/test/fixtures/issue-user/Input.md
new file mode 100644
index 0000000..8f58bda
--- /dev/null
+++ b/test/fixtures/issue-user/Input.md
@@ -0,0 +1,18 @@
+# User@Issue
+
+A user-issue is relative to the project, but relative to the user’s fork.
+
+GitHub’s usernames can contain alphabetical characters and dashes, but can neither begin nor end with a dash. Additionally, the length of a username can be between 1 and 39 characters (both including).
+
+-   This is a valid issue: wooorm#1;
+-   So is this: wooorm#123456789.
+
+They work here
+wooorm#1
+
+and here
+    wooorm#1
+
+This is not a valid, -wooorm#1; nor is this wooorm-#1; but this is w-w#1, and so is w#1 and ww#1.
+
+This is too long: wooormwooormwooormwooormwooormwooormwooo#1 (40 character username).
diff --git a/test/fixtures/issue-user/Output.md b/test/fixtures/issue-user/Output.md
new file mode 100644
index 0000000..030e5e1
--- /dev/null
+++ b/test/fixtures/issue-user/Output.md
@@ -0,0 +1,18 @@
+# User@Issue
+
+A user-issue is relative to the project, but relative to the user’s fork.
+
+GitHub’s usernames can contain alphabetical characters and dashes, but can neither begin nor end with a dash. Additionally, the length of a username can be between 1 and 39 characters (both including).
+
+-   This is a valid issue: [wooorm#1](https://github.com/wooorm/mdast/issues/1);
+-   So is this: [wooorm#123456789](https://github.com/wooorm/mdast/issues/123456789).
+
+They work here
+[wooorm#1](https://github.com/wooorm/mdast/issues/1)
+
+and here
+    [wooorm#1](https://github.com/wooorm/mdast/issues/1)
+
+This is not a valid, -wooorm#1; nor is this wooorm-#1; but this is [w-w#1](https://github.com/w-w/mdast/issues/1), and so is [w#1](https://github.com/w/mdast/issues/1) and [ww#1](https://github.com/ww/mdast/issues/1).
+
+This is too long: wooormwooormwooormwooormwooormwooormwooo#1 (40 character username).
diff --git a/test/fixtures/issue/Input.md b/test/fixtures/issue/Input.md
new file mode 100644
index 0000000..b1c6818
--- /dev/null
+++ b/test/fixtures/issue/Input.md
@@ -0,0 +1,17 @@
+# Issue
+
+-   This is a valid issue: #1, and so is this: GH-1;
+-   So are these: #123456789, and: GH-123456789;
+-   And these: gH-1, Gh-1, and gh-1.
+
+These will always be a header in non-commonmark mode (commonmark requires initial spaces for ATX-headings)
+#1
+
+Or here
+    #1
+
+But these will always work:
+GH-1
+
+Or here
+    GH-1
diff --git a/test/fixtures/issue/Output.md b/test/fixtures/issue/Output.md
new file mode 100644
index 0000000..cc29822
--- /dev/null
+++ b/test/fixtures/issue/Output.md
@@ -0,0 +1,19 @@
+# Issue
+
+-   This is a valid issue: [#1](https://github.com/wooorm/mdast/issues/1), and so is this: [GH-1](https://github.com/wooorm/mdast/issues/1);
+-   So are these: [#123456789](https://github.com/wooorm/mdast/issues/123456789), and: [GH-123456789](https://github.com/wooorm/mdast/issues/123456789);
+-   And these: [gH-1](https://github.com/wooorm/mdast/issues/1), [Gh-1](https://github.com/wooorm/mdast/issues/1), and [gh-1](https://github.com/wooorm/mdast/issues/1).
+
+These will always be a header in non-commonmark mode (commonmark requires initial spaces for ATX-headings)
+
+# 1
+
+Or here
+
+    #1
+
+But these will always work:
+[GH-1](https://github.com/wooorm/mdast/issues/1)
+
+Or here
+    [GH-1](https://github.com/wooorm/mdast/issues/1)
diff --git a/test/fixtures/mention/Input.md b/test/fixtures/mention/Input.md
new file mode 100644
index 0000000..2ae98da
--- /dev/null
+++ b/test/fixtures/mention/Input.md
@@ -0,0 +1,11 @@
+# Mention
+
+A mention links to a user, organisation, or team.
+
+For example, @user, @organization, or @organization/team-name.
+
+Additionally, GitHub does something funny with @mention’s and @mentions.
+
+Some valid real world examples: @a, @github, @github/security.
+
+But these names are invalid: @-w, @w-, but this is: @w-w.
diff --git a/test/fixtures/mention/Output.md b/test/fixtures/mention/Output.md
new file mode 100644
index 0000000..1657b8b
--- /dev/null
+++ b/test/fixtures/mention/Output.md
@@ -0,0 +1,11 @@
+# Mention
+
+A mention links to a user, organisation, or team.
+
+For example, [@user](https://github.com/user), [@organization](https://github.com/organization), or [@organization/team-name](https://github.com/organization/team-name).
+
+Additionally, GitHub does something funny with [@mention](https://github.com/blog/821)’s and [@mentions](https://github.com/blog/821).
+
+Some valid real world examples: [@a](https://github.com/a), [@github](https://github.com/github), [@github/security](https://github.com/github/security).
+
+But these names are invalid: @-w, @w-, but this is: [@w-w](https://github.com/w-w).
diff --git a/test/fixtures/sha-project/Input.md b/test/fixtures/sha-project/Input.md
new file mode 100644
index 0000000..93404e7
--- /dev/null
+++ b/test/fixtures/sha-project/Input.md
@@ -0,0 +1,61 @@
+# Project@SHA
+
+A project-SHA is not relative to the current project.
+
+GitHub’s project names can include alphabetical characters, dashes, and full-stops. They may end in a TLD (such as `.com`), but may not end in `.git` (for obvious reasons).
+
+-   wooorm/mdast@000000;
+-   wooorm/mdast@0000000;
+-   wooorm/mdast@00000000;
+-   wooorm/mdast@000000000;
+-   wooorm/mdast@0000000000;
+-   wooorm/mdast@00000000000;
+-   wooorm/mdast@000000000000;
+-   wooorm/mdast@0000000000000;
+-   wooorm/mdast@00000000000000;
+-   wooorm/mdast@000000000000000;
+-   wooorm/mdast@0000000000000000;
+-   wooorm/mdast@00000000000000000;
+-   wooorm/mdast@000000000000000000;
+-   wooorm/mdast@0000000000000000000;
+-   wooorm/mdast@00000000000000000000;
+-   wooorm/mdast@000000000000000000000;
+-   wooorm/mdast@0000000000000000000000;
+-   wooorm/mdast@00000000000000000000000;
+-   wooorm/mdast@000000000000000000000000;
+-   wooorm/mdast@0000000000000000000000000;
+-   wooorm/mdast@00000000000000000000000000;
+-   wooorm/mdast@000000000000000000000000000;
+-   wooorm/mdast@0000000000000000000000000000;
+-   wooorm/mdast@00000000000000000000000000000;
+-   wooorm/mdast@000000000000000000000000000000;
+-   wooorm/mdast@0000000000000000000000000000000;
+-   wooorm/mdast@00000000000000000000000000000000;
+-   wooorm/mdast@000000000000000000000000000000000;
+-   wooorm/mdast@0000000000000000000000000000000000;
+-   wooorm/mdast@00000000000000000000000000000000000;
+-   wooorm/mdast@00000000000000000000000000000000000;
+-   wooorm/mdast@000000000000000000000000000000000000;
+-   wooorm/mdast@0000000000000000000000000000000000000;
+-   wooorm/mdast@00000000000000000000000000000000000000;
+-   wooorm/mdast@000000000000000000000000000000000000000;
+-   wooorm/mdast@0000000000000000000000000000000000000000;
+-   wooorm/mdast@00000000000000000000000000000000000000000.
+
+And:
+
+-   Prefix wooorm/mdast@0000000 suffix;
+-   Prefix wooorm/mdast@0000000!;
+-   a wooorm/mdast@0000000!;
+
+And what about here
+wooorm/mdast@0000000
+
+Or here
+    wooorm/mdast@0000000
+
+And these SHAs which could also be words? wooorm/mdast@deedeed, and wooorm/mdast@fabaceae.
+
+Usernames: this is not a valid, -wooorm/mdast@0000000; nor is this wooorm-/mdast@0000000; but this is w-w/mdast@0000000, and so is w/mdast@0000000 and ww/mdast@0000000.
+
+Project names: this is not a valid, wooorm/c.git@0000000; but this is wooorm/c@0000000, so is w/w@0000000, and ww/.gitconfig@0000000.
diff --git a/test/fixtures/sha-project/Output.md b/test/fixtures/sha-project/Output.md
new file mode 100644
index 0000000..3bf19b5
--- /dev/null
+++ b/test/fixtures/sha-project/Output.md
@@ -0,0 +1,61 @@
+# Project@SHA
+
+A project-SHA is not relative to the current project.
+
+GitHub’s project names can include alphabetical characters, dashes, and full-stops. They may end in a TLD (such as `.com`), but may not end in `.git` (for obvious reasons).
+
+-   wooorm/mdast@000000;
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/00000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/00000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/00000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/00000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000000000000000);
+-   [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000000000000000);
+-   wooorm/mdast@00000000000000000000000000000000000000000.
+
+And:
+
+-   Prefix [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000) suffix;
+-   Prefix [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000)!;
+-   a [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000)!;
+
+And what about here
+[wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000)
+
+Or here
+    [wooorm/mdast@0000000](https://github.com/wooorm/mdast/commit/0000000)
+
+And these SHAs which could also be words? wooorm/mdast@deedeed, and wooorm/mdast@fabaceae.
+
+Usernames: this is not a valid, -wooorm/mdast@0000000; nor is this wooorm-/mdast@0000000; but this is [w-w/mdast@0000000](https://github.com/w-w/mdast/commit/0000000), and so is [w/mdast@0000000](https://github.com/w/mdast/commit/0000000) and [ww/mdast@0000000](https://github.com/ww/mdast/commit/0000000).
+
+Project names: this is not a valid, wooorm/c.git@0000000; but this is [wooorm/c@0000000](https://github.com/wooorm/c/commit/0000000), so is [w/w@0000000](https://github.com/w/w/commit/0000000), and [ww/.gitconfig@0000000](https://github.com/ww/.gitconfig/commit/0000000).
diff --git a/test/fixtures/sha-user/Input.md b/test/fixtures/sha-user/Input.md
new file mode 100644
index 0000000..64dfff3
--- /dev/null
+++ b/test/fixtures/sha-user/Input.md
@@ -0,0 +1,63 @@
+# User@SHA
+
+A user-SHA is relative to the project, but relative to the user’s fork.
+
+GitHub’s usernames can contain alphabetical characters and dashes, but can neither begin nor end with a dash. Additionally, the length of a username can be between 1 and 39 characters (both including).
+
+-   wooorm@000000;
+-   wooorm@0000000;
+-   wooorm@00000000;
+-   wooorm@000000000;
+-   wooorm@0000000000;
+-   wooorm@00000000000;
+-   wooorm@000000000000;
+-   wooorm@0000000000000;
+-   wooorm@00000000000000;
+-   wooorm@000000000000000;
+-   wooorm@0000000000000000;
+-   wooorm@00000000000000000;
+-   wooorm@000000000000000000;
+-   wooorm@0000000000000000000;
+-   wooorm@00000000000000000000;
+-   wooorm@000000000000000000000;
+-   wooorm@0000000000000000000000;
+-   wooorm@00000000000000000000000;
+-   wooorm@000000000000000000000000;
+-   wooorm@0000000000000000000000000;
+-   wooorm@00000000000000000000000000;
+-   wooorm@000000000000000000000000000;
+-   wooorm@0000000000000000000000000000;
+-   wooorm@00000000000000000000000000000;
+-   wooorm@000000000000000000000000000000;
+-   wooorm@0000000000000000000000000000000;
+-   wooorm@00000000000000000000000000000000;
+-   wooorm@000000000000000000000000000000000;
+-   wooorm@0000000000000000000000000000000000;
+-   wooorm@00000000000000000000000000000000000;
+-   wooorm@00000000000000000000000000000000000;
+-   wooorm@000000000000000000000000000000000000;
+-   wooorm@0000000000000000000000000000000000000;
+-   wooorm@00000000000000000000000000000000000000;
+-   wooorm@000000000000000000000000000000000000000;
+-   wooorm@0000000000000000000000000000000000000000;
+-   wooorm@00000000000000000000000000000000000000000.
+
+And:
+
+-   Prefix wooorm@0000000 suffix;
+-   Prefix wooorm@0000000!;
+-   a wooorm@0000000!;
+
+And what about here
+wooorm@0000000
+
+Or here
+    wooorm@0000000
+
+And these SHAs which could also be words? wooorm@deedeed, and wooorm@fabaceae.
+
+This is not a valid, -wooorm@0000000; nor is this wooorm-@0000000; but this is w-w@0000000, and so is w@0000000 and ww@0000000.
+
+And here’s an example of a disposable e-mail domain, which starts with 7 hexidecimal characters: wooorm@deadaddress.com, which shouldn’t match, because there’s no word break after the SHA-like part.
+
+This is too long: wooormwooormwooormwooormwooormwooormwooo#0000000 (40 character username).
diff --git a/test/fixtures/sha-user/Output.md b/test/fixtures/sha-user/Output.md
new file mode 100644
index 0000000..0b9105d
--- /dev/null
+++ b/test/fixtures/sha-user/Output.md
@@ -0,0 +1,63 @@
+# User@SHA
+
+A user-SHA is relative to the project, but relative to the user’s fork.
+
+GitHub’s usernames can contain alphabetical characters and dashes, but can neither begin nor end with a dash. Additionally, the length of a username can be between 1 and 39 characters (both including).
+
+-   wooorm@000000;
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/00000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/00000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/00000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/00000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000000000000000);
+-   [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000000000000000);
+-   wooorm@00000000000000000000000000000000000000000.
+
+And:
+
+-   Prefix [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000) suffix;
+-   Prefix [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000)!;
+-   a [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000)!;
+
+And what about here
+[wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000)
+
+Or here
+    [wooorm@0000000](https://github.com/wooorm/mdast/commit/0000000)
+
+And these SHAs which could also be words? wooorm@deedeed, and wooorm@fabaceae.
+
+This is not a valid, -wooorm@0000000; nor is this wooorm-@0000000; but this is [w-w@0000000](https://github.com/w-w/mdast/commit/0000000), and so is [w@0000000](https://github.com/w/mdast/commit/0000000) and [ww@0000000](https://github.com/ww/mdast/commit/0000000).
+
+And here’s an example of a disposable e-mail domain, which starts with 7 hexidecimal characters: wooorm@deadaddress.com, which shouldn’t match, because there’s no word break after the SHA-like part.
+
+This is too long: wooormwooormwooormwooormwooormwooormwooo#0000000 (40 character username).
diff --git a/test/fixtures/sha/Input.md b/test/fixtures/sha/Input.md
new file mode 100644
index 0000000..269d7ef
--- /dev/null
+++ b/test/fixtures/sha/Input.md
@@ -0,0 +1,53 @@
+# SHA
+
+-   000000;
+-   0000000;
+-   00000000;
+-   000000000;
+-   0000000000;
+-   00000000000;
+-   000000000000;
+-   0000000000000;
+-   00000000000000;
+-   000000000000000;
+-   0000000000000000;
+-   00000000000000000;
+-   000000000000000000;
+-   0000000000000000000;
+-   00000000000000000000;
+-   000000000000000000000;
+-   0000000000000000000000;
+-   00000000000000000000000;
+-   000000000000000000000000;
+-   0000000000000000000000000;
+-   00000000000000000000000000;
+-   000000000000000000000000000;
+-   0000000000000000000000000000;
+-   00000000000000000000000000000;
+-   000000000000000000000000000000;
+-   0000000000000000000000000000000;
+-   00000000000000000000000000000000;
+-   000000000000000000000000000000000;
+-   0000000000000000000000000000000000;
+-   00000000000000000000000000000000000;
+-   00000000000000000000000000000000000;
+-   000000000000000000000000000000000000;
+-   0000000000000000000000000000000000000;
+-   00000000000000000000000000000000000000;
+-   000000000000000000000000000000000000000;
+-   0000000000000000000000000000000000000000;
+-   00000000000000000000000000000000000000000.
+
+And:
+
+-   Prefix 0000000 suffix;
+-   Prefix 0000000!;
+-   a 0000000!;
+
+And what about here
+0000000
+
+Or here
+    0000000
+
+And these SHAs which could also be words? deedeed, and fabaceae.
diff --git a/test/fixtures/sha/Output.md b/test/fixtures/sha/Output.md
new file mode 100644
index 0000000..48374f0
--- /dev/null
+++ b/test/fixtures/sha/Output.md
@@ -0,0 +1,53 @@
+# SHA
+
+-   000000;
+-   [0000000](https://github.com/wooorm/mdast/commit/0000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/00000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/0000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/00000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/0000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/00000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/0000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/00000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/0000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/00000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/00000000000000000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/000000000000000000000000000000000000000);
+-   [0000000](https://github.com/wooorm/mdast/commit/0000000000000000000000000000000000000000);
+-   00000000000000000000000000000000000000000.
+
+And:
+
+-   Prefix [0000000](https://github.com/wooorm/mdast/commit/0000000) suffix;
+-   Prefix [0000000](https://github.com/wooorm/mdast/commit/0000000)!;
+-   a [0000000](https://github.com/wooorm/mdast/commit/0000000)!;
+
+And what about here
+[0000000](https://github.com/wooorm/mdast/commit/0000000)
+
+Or here
+    [0000000](https://github.com/wooorm/mdast/commit/0000000)
+
+And these SHAs which could also be words? deedeed, and fabaceae.
diff --git a/test/index.js b/test/index.js
new file mode 100644
index 0000000..8226319
--- /dev/null
+++ b/test/index.js
@@ -0,0 +1,349 @@
+'use strict';
+
+/*
+ * Dependencies.
+ */
+
+var mdastGitHub = require('..');
+var mdast = require('mdast').use(mdastGitHub);
+var assert = require('assert');
+var fs = require('fs');
+var path = require('path');
+var diff = require('diff');
+var chalk = require('chalk');
+
+/*
+ * Methods.
+ */
+
+var read = fs.readFileSync;
+var readdir = fs.readdirSync;
+
+/*
+ * Constants.
+ */
+
+var ROOT = path.join(__dirname, 'fixtures');
+
+/*
+ * Fixtures.
+ */
+
+var fixtures = readdir(ROOT);
+
+/**
+ * Shortcut to process.
+ *
+ * @param {string} value
+ * @return {string}
+ */
+function github(value, repo) {
+    var options;
+
+    if (typeof repo === 'string' || !repo) {
+        options = {
+            'repository': repo || null
+        };
+    } else {
+        options = repo;
+    }
+
+    return mdast.stringify(mdast.parse(value, options));
+}
+
+/*
+ * Tests.
+ */
+
+describe('mdast-github()', function () {
+    it('should be a function', function () {
+        assert(typeof mdastGitHub === 'function');
+    });
+
+    it('should throw if not passed a node', function () {
+        assert.throws(function () {
+            mdastGitHub(true);
+        });
+    });
+});
+
+/**
+ * Diff text.
+ *
+ * @param {string} value
+ * @param {string} baseline
+ */
+function compare(value, baseline) {
+    var difference;
+
+    try {
+        assert(value === baseline);
+    } catch (error) {
+        /* istanbul ignore next */
+        difference = diff.diffLines(value, baseline);
+
+        difference.forEach(function (change) {
+            var colour = change.added ?
+                'green' : change.removed ? 'red' : 'dim';
+
+            process.stderr.write(chalk[colour](change.value));
+        });
+
+        /* istanbul ignore next */
+        throw error;
+    }
+}
+
+/**
+ * Describe a fixtures.
+ *
+ * @param {string} fixture
+ */
+function describeFixture(fixture) {
+    it('should work on `' + fixture + '`', function () {
+        var filepath = ROOT + '/' + fixture;
+        var output = read(filepath + '/Output.md', 'utf-8');
+        var input = read(filepath + '/Input.md', 'utf-8');
+        var result = github(input, 'wooorm/mdast');
+
+        compare(result, output);
+    });
+}
+
+/**
+ * Describe a repo URL.
+ *
+ * @param {Array.<string>} repo
+ */
+function describeRepository(repo) {
+    var user = repo[1];
+    var project = repo[2];
+
+    repo = repo[0];
+
+    it('should work on `' + repo + '`', function () {
+        var input;
+        var output;
+        var result;
+
+        input = [
+            '-   SHA: a5c3785ed8d6a35868bc169f07e40e889087fd2e',
+            '-   User@SHA: wooorm@a5c3785ed8d6a35868bc169f07e40e889087fd2e',
+            '-   #Num: #26',
+            '-   GH-Num: GH-26',
+            '-   User#Num: wooorm#26'
+        ].join('\n') + '\n';
+
+        output = [
+            '-   SHA: [a5c3785](https://github.com/' + user + '/' + project +
+                '/commit/a5c3785ed8d6a35868bc169f07e40e889087fd2e)',
+            '-   User@SHA: [wooorm@a5c3785](https://github.com/wooorm/' +
+                project + '/commit/a5c3785ed8d6a35868bc169f07e40e889087fd2e)',
+            '-   # Num: [#26](https://github.com/' + user + '/' + project +
+                '/issues/26)',
+            '-   GH-Num: [GH-26](https://github.com/' + user + '/' + project +
+                '/issues/26)',
+            '-   User#Num: [wooorm#26](https://github.com/wooorm/' + project +
+                '/issues/26)'
+        ].join('\n') + '\n';
+
+        result = github(input, repo);
+
+        compare(result, output);
+    });
+}
+
+/*
+ * Gather fixtures.
+ */
+
+fixtures = fixtures.filter(function (filepath) {
+    return filepath.indexOf('.') !== 0;
+});
+
+describe('Fixtures', function () {
+    fixtures.forEach(describeFixture);
+});
+
+/*
+ * List of repo references possible in `package.json`s.
+ *
+ * From repo-utils/parse-github-repo-url, with some
+ * tiny additions.
+ */
+
+var repositories = [
+    [
+        'component/emitter',
+        'component',
+        'emitter'
+    ],
+    [
+        'https://github.com/component/emitter',
+        'component',
+        'emitter'
+    ],
+    [
+        'git://github.com/component/emitter.git',
+        'component',
+        'emitter'
+    ],
+    [
+        'https://github.com/repos/component/emitter/tarball',
+        'component',
+        'emitter'
+    ],
+    [
+        'https://github.com/repos/component/emitter/zipball',
+        'component',
+        'emitter'
+    ],
+    [
+        'https://codeload.github.com/component/emitter/legacy.zip',
+        'component',
+        'emitter'
+    ],
+    [
+        'https://codeload.github.com/component/emitter/legacy.tar.gz',
+        'component',
+        'emitter'
+    ],
+    [
+        'component/emitter#1',
+        'component',
+        'emitter'
+    ],
+    [
+        'component/emitter@1',
+        'component',
+        'emitter'
+    ],
+    [
+        'component/emitter#"1"',
+        'component',
+        'emitter'
+    ],
+    [
+        'component/emitter@"1"',
+        'component',
+        'emitter'
+    ],
+    [
+        'git://github.com/component/emitter.git#1',
+        'component',
+        'emitter'
+    ],
+    [
+        'https://github.com/repos/component/emitter/tarball/1',
+        'component',
+        'emitter'
+    ],
+    [
+        'https://github.com/repos/component/emitter/zipball/1',
+        'component',
+        'emitter'
+    ],
+    [
+        'https://codeload.github.com/component/emitter/legacy.zip/1',
+        'component',
+        'emitter'
+    ],
+    [
+        'https://codeload.github.com/component/emitter/legacy.tar.gz/1',
+        'component',
+        'emitter'
+    ],
+    [
+        'https://github.com/component/emitter/archive/1.tar.gz',
+        'component',
+        'emitter'
+    ],
+    [
+        'github/.gitignore',
+        'github',
+        '.gitignore'
+    ],
+    [
+        'github/.gitc',
+        'github',
+        '.gitc'
+    ]
+];
+
+describe('Repositories', function () {
+    repositories.forEach(describeRepository);
+});
+
+describe('Miscellaneous', function () {
+    it('should load a `package.json` when available', function () {
+        assert(
+            github('test@12345678', null) ===
+            '[test@1234567](https://github.com/' +
+            'test/mdast-github/commit/12345678)\n'
+        );
+    });
+
+    it('should accept a `repository.url` in a `package.json`', function () {
+        var cwd = process.cwd;
+
+        /**
+         * Move cwd to a path without another
+         * `package.json`.
+         */
+        function fakeCWD() {
+            return cwd() + '/test';
+        }
+
+        process.cwd = fakeCWD;
+
+        compare(
+            github('12345678', null),
+            '[1234567](https://github.com/' +
+            'wooorm/mdast/commit/12345678)\n'
+        );
+
+        process.cwd = cwd;
+    });
+
+    it('should not fail on ASTs without `position`', function () {
+        var ast = {
+            'type': 'root',
+            'children': [
+                {
+                    'type': 'paragraph',
+                    'children': [
+                        {
+                            'type': 'text',
+                            'value': '12345678'
+                        }
+                    ]
+                }
+            ]
+        };
+
+        compare(
+            mdast.stringify(mdast.run(ast)),
+            '[1234567](https://github.com/' +
+            'wooorm/mdast-github/commit/12345678)\n'
+        );
+    });
+
+    it('should throw without `repository`', function () {
+        var cwd = process.cwd;
+
+        /**
+         * Move cwd to a path without a `package.json`.
+         */
+        function fakeCWD() {
+            return cwd() + '/test/fixtures';
+        }
+
+        process.cwd = fakeCWD;
+
+        assert.throws(function () {
+            github('1234567', null);
+        }, /Missing `repository`/);
+
+        process.cwd = cwd;
+    });
+});
diff --git a/test/package.json b/test/package.json
new file mode 100644
index 0000000..5e3d9ba
--- /dev/null
+++ b/test/package.json
@@ -0,0 +1,3 @@
+{
+  "repository": "wooorm/mdast"
+}