Add command line parameter to set portable

If parameter included, home directory will be copied to the portable

spec/atom-portable-spec.coffee

@@ -4,6 +4,25 @@ temp = require "temp"
 rimraf = require "rimraf"
 AtomPortable = require "../src/browser/atom-portable"
 
+describe "Set Portable Mode", ->
+  portableAtomHomePath = path.join(path.dirname(process.execPath), "../.atom").toString()
+  portableAtomHomeNaturallyExists = fs.existsSync(portableAtomHomePath)
+  portableAtomHomeBackupPath = portableAtomHomePath + ".temp"
+
+  beforeEach ->
+    fs.renameSync(portableAtomHomePath, portableAtomHomeBackupPath) if fs.existsSync(portableAtomHomePath)
+
+  afterEach ->
+    if portableAtomHomeNaturallyExists
+      fs.renameSync(portableAtomHomeBackupPath, portableAtomHomePath) if not fs.existsSync(portableAtomHomePath)
+    else
+      rimraf.sync(portableAtomHomePath) if fs.existsSync(portableAtomHomePath)
+    rimraf.sync(portableAtomHomeBackupPath) if fs.existsSync(portableAtomHomeBackupPath)
+
+  it "creates portable home directory", ->
+    AtomPortable.setPortable(process.env.ATOM_HOME)
+    expect(fs.existsSync(portableAtomHomePath)).toBe true
+
 describe "Check for Portable Mode", ->
   describe "Windows", ->
     describe "with ATOM_HOME environment variable", ->

src/browser/atom-portable.coffee

@@ -8,6 +8,9 @@ class AtomPortable
     execDirectoryPath = path.dirname(process.execPath)
     path.join(execDirectoryPath, '..', '.atom')
 
+  @setPortable: (existingAtomHome) ->
+    fs.copySync(existingAtomHome, @getPortableAtomHomePath())
+
   @isPortableInstall: (platform, environmentAtomHome, defaultHome) ->
     return false unless platform is 'win32'
     return false if environmentAtomHome

src/browser/main.coffee

@@ -61,7 +61,9 @@ setupAtomHome = ->
   return if process.env.ATOM_HOME
   atomHome = path.join(app.getHomeDir(), '.atom')
   AtomPortable = require './atom-portable'
-  atomHome = AtomPortable.getPortableAtomHomePath() if AtomPortable.isPortableInstall(process.platform, process.env.ATOM_HOME, atomHome)
+
+  AtomPortable.setPortable(atomHome) if not AtomPortable.isPortableInstall(process.platform, process.env.ATOM_HOME, atomHome) and args.setPortable
+  atomHome = AtomPortable.getPortableAtomHomePath() if AtomPortable.isPortableInstall process.platform, process.env.ATOM_HOME, atomHome
   try
     atomHome = fs.realpathSync(atomHome)
   process.env.ATOM_HOME = atomHome
@@ -106,6 +108,7 @@ parseCommandLine = ->
   options.string('timeout').describe('timeout', 'When in test mode, waits until the specified time (in minutes) and kills the process (exit code: 130).')
   options.alias('v', 'version').boolean('v').describe('v', 'Print the version.')
   options.alias('w', 'wait').boolean('w').describe('w', 'Wait for window to be closed before returning.')
+  options.alias('p', 'set-portable').boolean('p').describe('p', 'Set portable mode.')
   options.string('socket-path')
 
   args = options.argv
@@ -131,6 +134,7 @@ parseCommandLine = ->
   profileStartup = args['profile-startup']
   urlsToOpen = []
   devResourcePath = process.env.ATOM_DEV_RESOURCE_PATH ? path.join(app.getHomeDir(), 'github', 'atom')
+  setPortable = args['set-portable']
 
   if args['resource-path']
     devMode = true
@@ -151,6 +155,6 @@ parseCommandLine = ->
 
   {resourcePath, devResourcePath, pathsToOpen, urlsToOpen, executedFrom, test,
    version, pidToKillWhenClosed, devMode, safeMode, newWindow,
-   logFile, socketPath, profileStartup, timeout}
+   logFile, socketPath, profileStartup, timeout, setPortable}
 
 start()