fix(args): make args conversion stateless (#85)

* fix(args): make args conversion stateless

* docs(args): replace short url by full url

* docs(contributors): add @hgwood

Author: hgwood

.all-contributorsrc

@@ -70,6 +70,17 @@
         "code",
         "test"
       ]
+    },
+    {
+      "login": "hgwood",
+      "name": "Hugo Wood",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/1656170?v=3",
+      "profile": "https://github.com/hgwood",
+      "contributions": [
+        "bug",
+        "code",
+        "test"
+      ]
     }
   ]
 }

README.md

@@ -10,7 +10,7 @@ Run scripts that set and use environment variables across platforms
 [![downloads][downloads-badge]][npm-stat]
 
 [![MIT License][license-badge]][LICENSE]
-[![All Contributors](https://img.shields.io/badge/all_contributors-6-orange.svg?style=flat-square)](#contributors)
+[![All Contributors](https://img.shields.io/badge/all_contributors-7-orange.svg?style=flat-square)](#contributors)
 [![PRs Welcome][prs-badge]][prs]
 [![Donate][donate-badge]][donate]
 [![Code of Conduct][coc-badge]][coc]
@@ -102,8 +102,8 @@ much easier for windows users.
 Thanks goes to these people ([emoji key][emojis]):
 
 <!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
-| [<img src="https://avatars.githubusercontent.com/u/1500684?v=3" width="100px;"/><br /><sub>Kent C. Dodds</sub>](https://kentcdodds.com)<br />[💻](https://github.com/kentcdodds/cross-env/commits?author=kentcdodds) [📖](https://github.com/kentcdodds/cross-env/commits?author=kentcdodds) 🚇 [⚠️](https://github.com/kentcdodds/cross-env/commits?author=kentcdodds) | [<img src="https://avatars1.githubusercontent.com/u/499038?v=3" width="100px;"/><br /><sub>Ya Zhuang </sub>](https://zhuangya.me)<br />🔌 [📖](https://github.com/kentcdodds/cross-env/commits?author=zhuangya) | [<img src="https://avatars3.githubusercontent.com/u/3440094?v=3" width="100px;"/><br /><sub>James Harris</sub>](https://wopian.me)<br />[📖](https://github.com/kentcdodds/cross-env/commits?author=wopian) | [<img src="https://avatars1.githubusercontent.com/u/8941730?v=3" width="100px;"/><br /><sub>compumike08</sub>](https://github.com/compumike08)<br />[🐛](https://github.com/kentcdodds/cross-env/issues?q=author%3Acompumike08) [📖](https://github.com/kentcdodds/cross-env/commits?author=compumike08) [⚠️](https://github.com/kentcdodds/cross-env/commits?author=compumike08) | [<img src="https://avatars1.githubusercontent.com/u/2270425?v=3" width="100px;"/><br /><sub>Daniel Rodríguez Rivero</sub>](https://github.com/danielo515)<br />[🐛](https://github.com/kentcdodds/cross-env/issues?q=author%3Adanielo515) [💻](https://github.com/kentcdodds/cross-env/commits?author=danielo515) [📖](https://github.com/kentcdodds/cross-env/commits?author=danielo515) | [<img src="https://avatars2.githubusercontent.com/u/1508477?v=3" width="100px;"/><br /><sub>Jonas Keinholz</sub>](https://github.com/inyono)<br />[🐛](https://github.com/kentcdodds/cross-env/issues?q=author%3Ainyono) [💻](https://github.com/kentcdodds/cross-env/commits?author=inyono) [⚠️](https://github.com/kentcdodds/cross-env/commits?author=inyono) |
-| :---: | :---: | :---: | :---: | :---: | :---: |
+| [<img src="https://avatars.githubusercontent.com/u/1500684?v=3" width="100px;"/><br /><sub>Kent C. Dodds</sub>](https://kentcdodds.com)<br />[💻](https://github.com/kentcdodds/cross-env/commits?author=kentcdodds) [📖](https://github.com/kentcdodds/cross-env/commits?author=kentcdodds) 🚇 [⚠️](https://github.com/kentcdodds/cross-env/commits?author=kentcdodds) | [<img src="https://avatars1.githubusercontent.com/u/499038?v=3" width="100px;"/><br /><sub>Ya Zhuang </sub>](https://zhuangya.me)<br />🔌 [📖](https://github.com/kentcdodds/cross-env/commits?author=zhuangya) | [<img src="https://avatars3.githubusercontent.com/u/3440094?v=3" width="100px;"/><br /><sub>James Harris</sub>](https://wopian.me)<br />[📖](https://github.com/kentcdodds/cross-env/commits?author=wopian) | [<img src="https://avatars1.githubusercontent.com/u/8941730?v=3" width="100px;"/><br /><sub>compumike08</sub>](https://github.com/compumike08)<br />[🐛](https://github.com/kentcdodds/cross-env/issues?q=author%3Acompumike08) [📖](https://github.com/kentcdodds/cross-env/commits?author=compumike08) [⚠️](https://github.com/kentcdodds/cross-env/commits?author=compumike08) | [<img src="https://avatars1.githubusercontent.com/u/2270425?v=3" width="100px;"/><br /><sub>Daniel Rodríguez Rivero</sub>](https://github.com/danielo515)<br />[🐛](https://github.com/kentcdodds/cross-env/issues?q=author%3Adanielo515) [💻](https://github.com/kentcdodds/cross-env/commits?author=danielo515) [📖](https://github.com/kentcdodds/cross-env/commits?author=danielo515) | [<img src="https://avatars2.githubusercontent.com/u/1508477?v=3" width="100px;"/><br /><sub>Jonas Keinholz</sub>](https://github.com/inyono)<br />[🐛](https://github.com/kentcdodds/cross-env/issues?q=author%3Ainyono) [💻](https://github.com/kentcdodds/cross-env/commits?author=inyono) [⚠️](https://github.com/kentcdodds/cross-env/commits?author=inyono) | [<img src="https://avatars3.githubusercontent.com/u/1656170?v=3" width="100px;"/><br /><sub>Hugo Wood</sub>](https://github.com/hgwood/blog)<br />[🐛](https://github.com/kentcdodds/cross-env/issues?q=author%3Ahgwood) [💻](https://github.com/kentcdodds/cross-env/commits?author=hgwood) [⚠️](https://github.com/kentcdodds/cross-env/commits?author=hgwood) |
+| :---: | :---: | :---: | :---: | :---: | :---: | :---: |
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
 This project follows the [all-contributors][all-contributors] specification. Contributions of any kind welcome!

src/command.js

@@ -2,8 +2,8 @@ import isWindows from 'is-windows'
 
 export default commandConvert
 
-const envUseUnixRegex = /\$(\w+)/g // $my_var
-const envUseWinRegex = /%(.*?)%/g // %my_var%
+const envUseUnixRegex = /\$(\w+)/ // $my_var
+const envUseWinRegex = /%(.*?)%/ // %my_var%
 
 /**
  * Converts an environment variable usage to be appropriate for the current OS

src/command.test.js

@@ -13,12 +13,20 @@ test(`converts unix-style env variable usage for windows`, () => {
 test(`leaves command unchanged when not a variable`, () => {
   expect(commandConvert('test')).toBe('test')
 })
+
 test(`converts windows-style env variable usage for linux`, () => {
   isWindowsMock.__mock.returnValue = false
   expect(commandConvert('%test%')).toBe('$test')
 })
 
 test(`leaves variable unchanged when using correct operating system`, () => {
-  isWindowsMock.__mock.returnValue = true
+  isWindowsMock.__mock.returnValue = false
   expect(commandConvert('$test')).toBe('$test')
 })
+
+test(`is stateless`, () => {
+  // this test prevents falling into regexp traps like this:
+  // http://stackoverflow.com/a/1520853/971592
+  isWindowsMock.__mock.returnValue = true
+  expect(commandConvert('$test')).toBe(commandConvert('$test'))
+})