😄

.eslintrc

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+{
+  "env": {
+    "node": true,
+    "es6": true
+  },
+  "rules": {
+    "strict": [2, "global"],
+    "no-shadow": 2,
+    "no-shadow-restricted-names": 2,
+    "no-unused-vars": [2, {
+      "vars": "local",
+      "args": "after-used"
+    }],
+    "no-use-before-define": 2,
+
+    "comma-dangle": [2, "never"],
+    "no-cond-assign": [0, "always"],
+    "no-console": 0,
+    "no-debugger": 1,
+    "no-alert": 1,
+    "no-constant-condition": 1,
+    "no-dupe-keys": 2,
+    "no-duplicate-case": 2,
+    "no-empty": 2,
+    "no-ex-assign": 2,
+    "no-extra-boolean-cast": 0,
+    "no-extra-semi": 2,
+    "no-func-assign": 2,
+    "no-inner-declarations": 2,
+    "no-invalid-regexp": 2,
+    "no-irregular-whitespace": 2,
+    "no-obj-calls": 2,
+    "quote-props": [2, "as-needed", {
+      "keywords": true
+    }],
+    "no-sparse-arrays": 2,
+    "no-unreachable": 2,
+    "use-isnan": 2,
+    "block-scoped-var": 2,
+
+    "consistent-return": 2,
+    "curly": 0,
+    "default-case": 2,
+    "dot-notation": [2, {
+      "allowKeywords": true
+    }],
+    "eqeqeq": 2,
+    "guard-for-in": 2,
+    "no-caller": 2,
+    "no-else-return": 2,
+    "no-eq-null": 2,
+    "no-eval": 2,
+    "no-extend-native": 2,
+    "no-extra-bind": 2,
+    "no-fallthrough": 2,
+    "no-floating-decimal": 2,
+    "no-implied-eval": 2,
+    "no-lone-blocks": 2,
+    "no-loop-func": 2,
+    "no-multi-str": 2,
+    "no-native-reassign": 2,
+    "no-new": 2,
+    "no-new-func": 2,
+    "no-new-wrappers": 2,
+    "no-octal": 2,
+    "no-octal-escape": 2,
+    "no-param-reassign": 0,
+    "no-proto": 2,
+    "no-redeclare": 2,
+    "no-return-assign": 2,
+    "no-script-url": 2,
+    "no-self-compare": 2,
+    "no-sequences": 2,
+    "no-throw-literal": 2,
+    "no-with": 2,
+    "radix": 2,
+    "wrap-iife": [2, "any"],
+    "yoda": 2,
+
+    "indent": [0, 2],
+    "brace-style": [2,
+      "1tbs", {
+        "allowSingleLine": true
+      }
+    ],
+    "quotes": [
+      2, "single", "avoid-escape"
+    ],
+    "camelcase": [2, {
+      "properties": "never"
+    }],
+    "comma-spacing": [2, {
+      "before": false,
+      "after": true
+    }],
+    "comma-style": [2, "last"],
+    "eol-last": 2,
+    "func-names": 0,
+    "key-spacing": [2, {
+      "beforeColon": false,
+      "afterColon": true
+    }],
+    "new-cap": 0,
+    "no-multiple-empty-lines": [2, {
+      "max": 2
+    }],
+    "no-nested-ternary": 2,
+    "no-new-object": 2,
+    "no-spaced-func": 2,
+    "no-trailing-spaces": 2,
+    "no-extra-parens": 2,
+    "no-underscore-dangle": 0,
+    "one-var": [2, "never"],
+    "padded-blocks": [2, "never"],
+    "semi": [2, "always"],
+    "semi-spacing": [2, {
+      "before": false,
+      "after": true
+    }],
+    "space-after-keywords": 2,
+    "space-before-blocks": 2,
+    "space-before-function-paren": [2, "never"],
+    "space-infix-ops": 2,
+    "space-return-throw-case": 2,
+    "spaced-comment": 2,
+    "no-path-concat": 0
+  }
+}

.gitignore

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+# Logs
+logs
+*.log
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directory
+# https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git
+node_modules

.travis.yml

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+language: node_js
+node_js:
+  - "stable"
+  - "4.0.0"
+  - "5.0.0"
+script: "npm run test-travis"
+after_script: "npm install coveralls@2.10.0 && cat ./coverage/lcov.info | coveralls"

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015 LingyuCoder
+
+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.

README.md

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+# check-taggable
+
+[![Test coverage](https://img.shields.io/coveralls/LingyuCoder/check-taggable.svg?style=flat-square)](https://coveralls.io/r/LingyuCoder/check-taggable?branch=master)
+[![Build Status](https://travis-ci.org/LingyuCoder/check-taggable.png)](https://travis-ci.org/LingyuCoder/check-taggable)
+[![Dependency Status](https://david-dm.org/LingyuCoder/check-taggable.svg)](https://david-dm.org/LingyuCoder/check-taggable)
+[![devDependency Status](https://david-dm.org/LingyuCoder/check-taggable/dev-status.svg)](https://david-dm.org/LingyuCoder/check-taggable#info=devDependencies)
+[![NPM version](http://img.shields.io/npm/v/check-taggable.svg?style=flat-square)](http://npmjs.org/package/check-taggable)
+[![node](https://img.shields.io/badge/node.js-%3E=_4.0-green.svg?style=flat-square)](http://nodejs.org/download/)
+[![License](http://img.shields.io/npm/l/check-taggable.svg?style=flat-square)](LICENSE)
+[![npm download](https://img.shields.io/npm/dm/check-taggable.svg?style=flat-square)](https://npmjs.org/package/check-taggable)
+
+Check whether the tag can be used
+
+## Installation
+
+```bash
+$ npm install --save check-taggable
+```
+
+## Usage
+
+## Test
+
+```bash
+$ npm run test
+$ npm run test-cov
+$ npm run test-travis
+```
+
+## License
+
+The MIT License (MIT)
+
+Copyright (c) 2015 LingyuCoder
+
+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.

index.js

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+'use strict';
+
+const execSync = require('child_process').execSync;
+const co = require('co');
+
+module.exports = co.wrap(function*(tag, cwd) {
+  cwd = cwd || process.cwd();
+  if (typeof tag !== 'string') throw Promise.reject(new TypeError('Expected tag to be a string'));
+  if (typeof cwd !== 'string') throw Promise.reject(new TypeError('Expected cwd to be a string'));
+  let cmdRst = '';
+  try {
+    cmdRst = execSync('git tag', {
+      cwd: cwd,
+      stdio: 'pipe'
+    }).toString();
+  } catch (e) {
+    if (e.message.indexOf('Not a git repository') !== -1)
+      return Promise.reject(new Error(`No git repository was found in ${cwd}`));
+    return Promise.reject(e);
+  }
+  return {
+    success: cmdRst.split('\n').filter(v => !!v).indexOf(tag) === -1
+  };
+});

package.json

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+{
+  "name": "check-taggable",
+  "version": "0.0.1",
+  "description": "Check whether the tag can be used",
+  "main": "index.js",
+  "scripts": {
+    "test": "NODE_ENV=test ./node_modules/.bin/_mocha --require should --reporter spec",
+    "test-cov": "NODE_ENV=test node ./node_modules/.bin/istanbul cover ./node_modules/.bin/_mocha -- --require should",
+    "test-travis": "NODE_ENV=test node ./node_modules/.bin/istanbul cover ./node_modules/.bin/_mocha --report lcovonly -- --require should"
+  },
+  "author": "LingyuCoder",
+  "license": "MIT",
+  "devDependencies": {
+    "istanbul": "~0.4.0",
+    "mocha": "~2.3.3",
+    "should": "^8.0.2"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/LingyuCoder/check-taggable"
+  },
+  "keywords": [],
+  "bugs": {
+    "url": "https://github.com/LingyuCoder/check-taggable/issues"
+  },
+  "publishConfig": {
+    "registry": "http://registry.npmjs.org/"
+  },
+  "dependencies": {
+    "co": "^4.6.0"
+  }
+}

test/test.js

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+'use strict';
+
+require('should');
+const checker = require('../index');
+const fs = require('fs');
+const path = require('path');
+const os = require('os');
+const execSync = require('child_process').execSync;
+
+describe('check-tracked', () => {
+  describe('success', () => {
+    it('should resolve object with success true if tag can be used', () => {
+      return checker('publish/success').should.be.fulfilledWith({
+        success: true
+      });
+    });
+  });
+  describe('fail', () => {
+    beforeEach(() => execSync('git tag -a publish/test'));
+    afterEach(() => execSync('git tag -d publish/test'));
+    it('should resolve object with success false if tag had been used', () => {
+      return checker('publish/fail').should.be.fulfilledWith({
+        success: false
+      });
+    });
+  });
+  describe('error', () => {
+    it('should reject with an error when tag is not a string', () => {
+      return checker({}).should.be.rejectedWith(TypeError, {
+        message: 'Expected tag to be a string'
+      });
+    });
+    it('should reject with an error when cwd is not a string', () => {
+      return checker('publish/test', {}).should.be.rejectedWith(TypeError, {
+        message: 'Expected cwd to be a string'
+      });
+    });
+  });
+});