feat(args): convert embedded and braced variables in command args (#86)

* feat(args): convert variables embedded in command args

* feat(args): convert braced variables in command args

* style(args): full test name on one line

* refactor(args): make commandConvert definitly stateless

BREAKING CHANGE: `echo $var2/$var1` would not be changed on windows, now it is. This is kind of a bug, but we're doing a major version bump to be safe.

src/command.js

@@ -2,20 +2,15 @@ import isWindows from 'is-windows'
 
 export default commandConvert
 
-const envUseUnixRegex = /\$(\w+)/ // $my_var
-const envUseWinRegex = /%(.*?)%/ // %my_var%
-
 /**
  * Converts an environment variable usage to be appropriate for the current OS
  * @param {String} command Command to convert
  * @returns {String} Converted command
  */
 function commandConvert(command) {
+  const envUseUnixRegex = /\$(\w+)|\${(\w+)}/g // $my_var or ${my_var}
+  const envUseWinRegex = /%(.*?)%/g // %my_var%
   const isWin = isWindows()
   const envExtract = isWin ? envUseUnixRegex : envUseWinRegex
-  const match = envExtract.exec(command)
-  if (match) {
-    command = isWin ? `%${match[1]}%` : `$${match[1]}`
-  }
-  return command
+  return command.replace(envExtract, isWin ? '%$1$2%' : '$$$1')
 }

src/command.test.js

@@ -30,3 +30,29 @@ test(`is stateless`, () => {
   isWindowsMock.__mock.returnValue = true
   expect(commandConvert('$test')).toBe(commandConvert('$test'))
 })
+
+test(`converts embedded unix-style env variables usage for windows`, () => {
+  isWindowsMock.__mock.returnValue = true
+  expect(commandConvert('$test1/$test2/$test3')).toBe(
+    '%test1%/%test2%/%test3%',
+  )
+})
+
+test(`converts embedded windows-style env variables usage for linux`, () => {
+  isWindowsMock.__mock.returnValue = false
+  expect(commandConvert('%test1%/%test2%/%test3%')).toBe(
+    '$test1/$test2/$test3',
+  )
+})
+
+// eslint-disable-next-line max-len
+test(`leaves embedded variables unchanged when using correct operating system`, () => {
+  isWindowsMock.__mock.returnValue = false
+  expect(commandConvert('$test1/$test2/$test3')).toBe('$test1/$test2/$test3')
+})
+
+test(`converts braced unix-style env variable usage for windows`, () => {
+  isWindowsMock.__mock.returnValue = true
+  // eslint-disable-next-line no-template-curly-in-string
+  expect(commandConvert('${test}')).toBe('%test%')
+})