Bundle a themes directory so we don't depend on ~/.atom/themes

We'll look first in the user themes directory, then in the built-in
themes directory. This allows us to default to 'IR_Black' and not crash
if the user doesn't setup their `~/.atom/themes` directory.

src/app/config.coffee

@@ -9,6 +9,7 @@ Theme = require 'theme'
 configDirPath = fs.absolute("~/.atom")
 configJsonPath = fs.join(configDirPath, "config.json")
 userInitScriptPath = fs.join(configDirPath, "atom.coffee")
+bundledThemesDirPath = fs.join(resourcePath, "themes")
 bundledPackagesDirPath = fs.join(resourcePath, "src/packages")
 userThemesDirPath = fs.join(configDirPath, "themes")
 userPackagesDirPath = fs.join(configDirPath, "packages")
@@ -18,7 +19,7 @@ require.paths.unshift userPackagesDirPath
 module.exports =
 class Config
   configDirPath: configDirPath
-  themeDirPath: userThemesDirPath
+  themeDirPaths: [userThemesDirPath, bundledThemesDirPath]
   packageDirPaths: [userPackagesDirPath, bundledPackagesDirPath]
   settings: null
 

src/app/theme.coffee

@@ -16,8 +16,8 @@ class Theme
     if fs.exists(name)
       path = name
     else
-      regex = new RegExp("#{_.escapeRegExp(name)}(\.[^.]*)?$", "i")
-      path = _.find fs.list(config.themeDirPath), (path) -> regex.test(path)
+      path = fs.resolve(config.themeDirPaths..., name)
+      path ?= fs.resolve(config.themeDirPaths..., name + ".tmTheme")
 
     if @isTextMateTheme(path)
       theme = @loadTextMateTheme(path)

src/stdlib/fs.coffee

@@ -124,6 +124,13 @@ module.exports =
   md5ForPath: (path) ->
     $native.md5ForPath(path)
 
+  resolve: (paths...) ->
+    to = paths.pop()
+    for from in paths
+      path = @join(from, to)
+      return path if @exists(path)
+    undefined
+
   isCompressedExtension: (ext) ->
     _.contains([
       '.gz'