Make appdirs an optional requirement

3 files changed, 14 insertions, 6 deletions

diff --git a/isort/settings.py b/isort/settings.py
index 7b3153c6..9024dfc1 100644
--- a/isort/settings.py
+++ b/isort/settings.py
@@ -34,8 +34,6 @@ import warnings
 from collections import namedtuple
 from distutils.util import strtobool
 
-import appdirs
-
 from .pie_slice import lru_cache
 from .utils import difference, union
 
@@ -49,8 +47,12 @@ try:
 except ImportError:
     toml = False
 
-if appdirs.system == 'darwin':
-    appdirs.system = 'linux2'
+try:
+    import appdirs
+    if appdirs.system == 'darwin':
+        appdirs.system = 'linux2'
+except ImportError:
+    appdirs = None
 
 MAX_CONFIG_SEARCH_DEPTH = 25  # The number of parent directories isort will look for a config file within
 DEFAULT_SECTIONS = ('FUTURE', 'STDLIB', 'THIRDPARTY', 'FIRSTPARTY', 'LOCALFOLDER')
@@ -164,9 +166,13 @@ default = {'force_to_top': [],
 @lru_cache()
 def from_path(path):
     computed_settings = default.copy()
+    isort_defaults = ['~/.isort.cfg']
+    if appdirs:
+        isort_defaults = [appdirs.user_config_dir('isort.cfg')] + isort_defaults
+        
     _update_settings_with_config(path, '.editorconfig', ['~/.editorconfig'], ('*', '*.py', '**.py'), computed_settings)
     _update_settings_with_config(path, 'pyproject.toml', [], ('tool.isort', ), computed_settings)
-    _update_settings_with_config(path, '.isort.cfg', [appdirs.user_config_dir('isort.cfg'), '~/.isort.cfg'], ('settings', 'isort'), computed_settings)
+    _update_settings_with_config(path, '.isort.cfg', isort_defaults, ('settings', 'isort'), computed_settings)
     _update_settings_with_config(path, 'setup.cfg', [], ('isort', 'tool:isort'), computed_settings)
     _update_settings_with_config(path, 'tox.ini', [], ('isort', 'tool:isort'), computed_settings)
     return computed_settings
diff --git a/requirements.txt b/requirements.txt
index 5a72af01..ebd54a93 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
 pytest==2.9.1
 ipython==4.1.2
+appdirs
diff --git a/setup.py b/setup.py
index 95908a58..3a2ea7f9 100755
--- a/setup.py
+++ b/setup.py
@@ -25,8 +25,9 @@ setup(name='isort',
           'pipfile': ['pipreqs', 'requirementslib'],
           'pyproject': ['toml'],
           'requirements': ['pip', 'pipreqs'],
+          'xdg_home': ['appdirs'],
       },
-      install_requires=['futures; python_version < "3.2"', 'appdirs'],
+      install_requires=['futures; python_version < "3.2"'],
       python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*",
       keywords='Refactor, Python, Python2, Python3, Refactoring, Imports, Sort, Clean',
       classifiers=['Development Status :: 6 - Mature',