Move public stylesheet related methods off of atom.themes

* Move atom.themes.getUserStylesheetPath to 
  atom.styles.getUserStyleSheetPath
* Deprecate atom.themes.requireStylesheet

spec/theme-manager-spec.coffee

@@ -70,7 +70,7 @@ describe "ThemeManager", ->
   describe "when the core.themes config value changes", ->
     it "add/removes stylesheets to reflect the new config value", ->
       themeManager.onDidReloadAll reloadHandler = jasmine.createSpy()
-      spyOn(themeManager, 'getUserStylesheetPath').andCallFake -> null
+      spyOn(atom.styles, 'getUserStyleSheetPath').andCallFake -> null
 
       waitsForPromise ->
         themeManager.activateThemes()
@@ -268,7 +268,7 @@ describe "ThemeManager", ->
       [stylesheetRemovedHandler, stylesheetAddedHandler, stylesheetsChangedHandler] = []
       userStylesheetPath = path.join(temp.mkdirSync("atom"), 'styles.less')
       fs.writeFileSync(userStylesheetPath, 'body {border-style: dotted !important;}')
-      spyOn(themeManager, 'getUserStylesheetPath').andReturn userStylesheetPath
+      spyOn(atom.styles, 'getUserStyleSheetPath').andReturn userStylesheetPath
 
       waitsForPromise ->
         themeManager.activateThemes()

src/style-manager.coffee

@@ -1,3 +1,5 @@
+fs = require 'fs-plus'
+path = require 'path'
 {Emitter, Disposable} = require 'event-kit'
 
 # Extended: A singleton instance of this class available via `atom.styles`,
@@ -149,3 +151,17 @@ class StyleManager
     existingStyleElements = @getStyleElements()
     for styleElement in styleElementsToRestore
       @addStyleElement(styleElement) unless styleElement in existingStyleElements
+
+  ###
+  Section: Paths
+  ###
+
+  # Extended: Get the path of the user style sheet in `~/.atom`.
+  #
+  # Returns a {String}.
+  getUserStyleSheetPath: ->
+    stylesheetPath = fs.resolve(path.join(atom.getConfigDirPath(), 'styles'), ['css', 'less'])
+    if fs.isFileSync(stylesheetPath)
+      stylesheetPath
+    else
+      path.join(atom.getConfigDirPath(), 'styles.less')

src/theme-manager.coffee

@@ -202,18 +202,15 @@ class ThemeManager
     atom.config.set('core.themes', enabledThemeNames)
 
   ###
-  Section: Managing Stylesheets
+  Section: Private
   ###
 
-  # Public: Returns the {String} path to the user's stylesheet under ~/.atom
+  # Returns the {String} path to the user's stylesheet under ~/.atom
   getUserStylesheetPath: ->
-    stylesheetPath = fs.resolve(path.join(@configDirPath, 'styles'), ['css', 'less'])
-    if fs.isFileSync(stylesheetPath)
-      stylesheetPath
-    else
-      path.join(@configDirPath, 'styles.less')
+    Grim.deprecate("Call atom.styles.getUserStyleSheetPath() instead")
+    atom.styles.getUserStyleSheetPath()
 
-  # Public: Resolve and apply the stylesheet specified by the path.
+  # Resolve and apply the stylesheet specified by the path.
   #
   # This supports both CSS and Less stylsheets.
   #
@@ -236,7 +233,7 @@ class ThemeManager
 
   loadUserStylesheet: ->
     @unwatchUserStylesheet()
-    userStylesheetPath = @getUserStylesheetPath()
+    userStylesheetPath = atom.styles.getUserStyleSheetPath()
     return unless fs.isFileSync(userStylesheetPath)
 
     @userStylesheetPath = userStylesheetPath
@@ -297,10 +294,6 @@ class ThemeManager
   applyStylesheet: (path, text, type='bundled') ->
     @styleSheetDisposablesBySourcePath[path] = atom.styles.addStyleSheet(text, sourcePath: path, group: type)
 
-  ###
-  Section: Private
-  ###
-
   stringToId: (string) ->
     string.replace(/\\/g, '/')
 

src/workspace.coffee

@@ -61,7 +61,7 @@ class Workspace extends Model
     @addOpener (filePath) =>
       switch filePath
         when 'atom://.atom/stylesheet'
-          @open(atom.themes.getUserStylesheetPath())
+          @open(atom.styles.getUserStyleSheetPath())
         when 'atom://.atom/keymap'
           @open(atom.keymaps.getUserKeymapPath())
         when 'atom://.atom/config'