Var renames

Replaced more references to deprecated envvar names to their newer
counterparts.

bin/cheat

@@ -13,7 +13,7 @@ Usage:
   cheat -v
 
 Options:
-  -d --directories  List directories on CHEATPATH
+  -d --directories  List directories on $CHEAT_PATH
   -e --edit         Edit cheatsheet
   -l --list         List cheatsheets
   -s --search       Search cheatsheets for <keyword>

cheat/sheet.py

@@ -13,12 +13,12 @@ class Sheet:
     def copy(self, current_sheet_path, new_sheet_path):
         """ Copies a sheet to a new path """
 
-        # attempt to copy the sheet to DEFAULT_CHEAT_DIR
+        # attempt to copy the sheet to CHEAT_DEFAULT_DIR
         try:
             shutil.copy(current_sheet_path, new_sheet_path)
 
         # fail gracefully if the cheatsheet cannot be copied. This can happen
-        # if DEFAULT_CHEAT_DIR does not exist
+        # if CHEAT_DEFAULT_DIR does not exist
         except IOError:
             Utils.die('Could not copy cheatsheet for editing.')
 

cheat/sheets.py

@@ -67,15 +67,15 @@ class Sheets:
             self.default_path(),
         ]
 
-        # merge the CHEATPATH paths into the sheet_paths
+        # merge the CHEAT_PATH paths into the sheet_paths
         if self._config.cheat_path:
             for path in self._config.cheat_path.split(os.pathsep):
                 if os.path.isdir(path):
                     sheet_paths.append(path)
 
         if not sheet_paths:
-            Utils.die('The DEFAULT_CHEAT_DIR dir does not exist '
-                      + 'or the CHEATPATH is not set.')
+            Utils.die('The CHEAT_DEFAULT_DIR dir does not exist '
+                      + 'or the CHEAT_PATH is not set.')
 
         return sheet_paths