Installation issues

Resolves the following:

- #351 (use of `sudo` when installing)
- #420 (failure to install on Windows)
- #431 (failure to install on MacOS)

Application now relies on `appdirs` module to identify the appropriate
locations for storing configuration and data, both during installation
and runtime.

README.md

@@ -50,9 +50,12 @@ Installing
 It is recommended to install `cheat` with `pip`:
 
 ```sh
-[sudo] pip install cheat
+pip install cheat --user
 ```
 
+(You must ensure that the `Location` identified by `pip show cheat` exists on
+your `PATH`.)
+
 [Other installation methods are available][installing].
 
 

Vagrantfile

@@ -8,10 +8,13 @@ Vagrant.configure("2") do |config|
     vb.memory = "512"
   end
 
-  config.vm.provision "shell", inline: <<-SHELL
+  config.vm.provision "shell", privileged: false, inline: <<-SHELL
      sudo apt-get update
      sudo apt-get install -y python-pip
-     su vagrant && sudo -H pip install docopt pygments termcolor flake8
-     cd /vagrant && sudo python setup.py install
+     sudo -H pip install flake8
+     pip install --user docopt pygments termcolor
+     cd /vagrant/ && python setup.py install --user
+     echo 'export PATH=$PATH:/home/vagrant/.local/bin' >> /home/vagrant/.bashrc
   SHELL
+
 end

cheat/configuration.py

@@ -1,4 +1,5 @@
 from cheat.utils import Utils
+import appdirs
 import json
 import os
 
@@ -9,10 +10,12 @@ class Configuration:
         # compute the location of the config files
         config_file_path_global = self._select([
             os.environ.get('CHEAT_GLOBAL_CONF_PATH'),
+            appdirs.site_config_dir('cheat', 'cheat'),
             '/etc/cheat',
         ])
         config_file_path_local = self._select([
             os.environ.get('CHEAT_LOCAL_CONF_PATH'),
+            appdirs.user_config_dir('cheat', 'cheat'),
             os.path.expanduser('~/.config/cheat/cheat'),
         ])
 
@@ -82,6 +85,8 @@ class Configuration:
             os.environ.get('CHEAT_PATH'),
             os.environ.get('CHEATPATH'),
             config.get('CHEAT_PATH'),
+            appdirs.user_data_dir('cheat', 'cheat'),
+            appdirs.site_data_dir('cheat', 'cheat'),
             '/usr/share/cheat',
         ])
 

setup.py

@@ -1,10 +1,23 @@
 from distutils.core import setup
 import os
 
-# determine the directory in which to install system-wide cheatsheets
-# KLUDGE: It would be better to read `/usr/share/cheat` from `config/cheat`
-# rather than hard-coding it here
-cheat_path = os.environ.get('CHEAT_PATH') or '/usr/share/cheat'
+# install appdirs if it cannot be imported
+try:
+    import appdirs
+except ImportError:
+    import pip
+    pip.main(['install', 'appdirs'])
+    import appdirs
+
+# determine the path in which to install the cheatsheets included with the
+# package
+cheat_path = os.environ.get('CHEAT_PATH') or \
+                appdirs.user_data_dir('cheat', 'cheat')
+
+# determine the path in which to install the config file
+config_path = os.environ.get('CHEAT_GLOBAL_CONF_PATH') or \
+                os.environ.get('CHEAT_LOCAL_CONF_PATH') or \
+                appdirs.user_config_dir('cheat', 'cheat')
 
 # aggregate the systme-wide cheatsheets
 cheat_files = []
@@ -29,12 +42,13 @@ setup(
     ],
     scripts=['bin/cheat'],
     install_requires=[
+        'appdirs >= 1.4.3',
         'docopt >= 0.6.1',
         'pygments >= 1.6.0',
         'termcolor >= 1.1.0',
     ],
     data_files=[
         (cheat_path, cheat_files),
-        ('/etc', ['config/cheat']),
+        (config_path, ['config/cheat']),
     ],
 )