Clear state in indexedDB if ‘clear-state’ command-line flag is passed

src/atom-environment.coffee

@@ -122,13 +122,15 @@ class AtomEnvironment extends Model
     {@blobStore, @applicationDelegate, @window, @document, configDirPath, @enablePersistence, onlyLoadBaseStyleSheets} = params
 
     @loadTime = null
-    {devMode, safeMode, resourcePath} = @getLoadSettings()
+    {devMode, safeMode, resourcePath, clearState} = @getLoadSettings()
 
     @emitter = new Emitter
     @disposables = new CompositeDisposable
 
     @stateStore = new StateStore('AtomEnvironments', 1)
 
+    @stateStore.clear() if clearState
+
     @deserializers = new DeserializerManager(this)
     @deserializeTimings = {}
 
@@ -648,7 +650,7 @@ class AtomEnvironment extends Model
     @registerDefaultTargetForKeymaps()
 
     @packages.loadPackages()
-    
+
     @document.body.appendChild(@views.getView(@workspace))
 
     @watchProjectPath()

src/browser/atom-application.coffee

@@ -65,7 +65,7 @@ class AtomApplication
   exit: (status) -> app.exit(status)
 
   constructor: (options) ->
-    {@resourcePath, @devResourcePath, @version, @devMode, @safeMode, @socketPath, timeout} = options
+    {@resourcePath, @devResourcePath, @version, @devMode, @safeMode, @socketPath, timeout, clearState} = options
 
     @socketPath = null if options.test
 
@@ -89,16 +89,16 @@ class AtomApplication
     else
       @loadState(options) or @openPath(options)
 
-  openWithOptions: ({pathsToOpen, executedFrom, urlsToOpen, test, pidToKillWhenClosed, devMode, safeMode, newWindow, logFile, profileStartup, timeout}) ->
+  openWithOptions: ({pathsToOpen, executedFrom, urlsToOpen, test, pidToKillWhenClosed, devMode, safeMode, newWindow, logFile, profileStartup, timeout, clearState}) ->
     if test
       @runTests({headless: true, devMode, @resourcePath, executedFrom, pathsToOpen, logFile, timeout})
     else if pathsToOpen.length > 0
-      @openPaths({pathsToOpen, executedFrom, pidToKillWhenClosed, newWindow, devMode, safeMode, profileStartup})
+      @openPaths({pathsToOpen, executedFrom, pidToKillWhenClosed, newWindow, devMode, safeMode, profileStartup, clearState})
     else if urlsToOpen.length > 0
       @openUrl({urlToOpen, devMode, safeMode}) for urlToOpen in urlsToOpen
     else
       # Always open a editor window if this is the first instance of Atom.
-      @openPath({pidToKillWhenClosed, newWindow, devMode, safeMode, profileStartup})
+      @openPath({pidToKillWhenClosed, newWindow, devMode, safeMode, profileStartup, clearState})
 
   # Public: Removes the {AtomWindow} from the global window list.
   removeWindow: (window) ->
@@ -387,8 +387,8 @@ class AtomApplication
   #   :safeMode - Boolean to control the opened window's safe mode.
   #   :profileStartup - Boolean to control creating a profile of the startup time.
   #   :window - {AtomWindow} to open file paths in.
-  openPath: ({pathToOpen, pidToKillWhenClosed, newWindow, devMode, safeMode, profileStartup, window} = {}) ->
-    @openPaths({pathsToOpen: [pathToOpen], pidToKillWhenClosed, newWindow, devMode, safeMode, profileStartup, window})
+  openPath: ({pathToOpen, pidToKillWhenClosed, newWindow, devMode, safeMode, profileStartup, window, clearState} = {}) ->
+    @openPaths({pathsToOpen: [pathToOpen], pidToKillWhenClosed, newWindow, devMode, safeMode, profileStartup, window, clearState})
 
   # Public: Opens multiple paths, in existing windows if possible.
   #
@@ -400,9 +400,10 @@ class AtomApplication
   #   :safeMode - Boolean to control the opened window's safe mode.
   #   :windowDimensions - Object with height and width keys.
   #   :window - {AtomWindow} to open file paths in.
-  openPaths: ({pathsToOpen, executedFrom, pidToKillWhenClosed, newWindow, devMode, safeMode, windowDimensions, profileStartup, window}={}) ->
+  openPaths: ({pathsToOpen, executedFrom, pidToKillWhenClosed, newWindow, devMode, safeMode, windowDimensions, profileStartup, window, clearState}={}) ->
     devMode = Boolean(devMode)
     safeMode = Boolean(safeMode)
+    clearState = Boolean(clearState)
     locationsToOpen = (@locationForPathToOpen(pathToOpen, executedFrom) for pathToOpen in pathsToOpen)
     pathsToOpen = (locationToOpen.pathToOpen for locationToOpen in locationsToOpen)
 
@@ -435,7 +436,7 @@ class AtomApplication
       windowInitializationScript ?= require.resolve('../initialize-application-window')
       resourcePath ?= @resourcePath
       windowDimensions ?= @getDimensionsForNewWindow()
-      openedWindow = new AtomWindow({locationsToOpen, windowInitializationScript, resourcePath, devMode, safeMode, windowDimensions, profileStartup})
+      openedWindow = new AtomWindow({locationsToOpen, windowInitializationScript, resourcePath, devMode, safeMode, windowDimensions, profileStartup, clearState})
 
     if pidToKillWhenClosed?
       @pidsToOpenWindows[pidToKillWhenClosed] = openedWindow

src/browser/atom-window.coffee

@@ -50,6 +50,7 @@ class AtomWindow
     loadSettings.safeMode ?= false
     loadSettings.atomHome = process.env.ATOM_HOME
     loadSettings.firstLoad = true
+    loadSettings.clearState ?= false
 
     # Only send to the first non-spec window created
     if @constructor.includeShellLoadTime and not @isSpec