Added a CLI param param to calcluate the aspect

This is useful if you don't know the aspect ratio of your current resolution
and quickly want to know which folder is best used for your screen.

wpclassifier/wpclassifier/__init__.py

@@ -15,6 +15,12 @@ def get_image_size(filepath):
         LOG.error("Unable to open file %s (%s)" % (filepath, str(e)))
         return None
 
+def aspect_folder(width, height):
+    """
+    Given an image aspect ratio, return a folder name
+    """
+    return "%d@%d" % (width, height)
+
 def get_image_aspect(filepath):
     """
     Returns the image aspect ratio as a tuple of width/height. This simplifies
@@ -25,9 +31,8 @@ def get_image_aspect(filepath):
     size = get_image_size(filepath)
     if not size:
         return None
-    x, y = size
-    fract = Fraction(x, y)
-    return fract.numerator, fract.denominator
+    fract = Fraction(*size)
+    return fract
 
 def move_files(input_dir, output_dir, as_aspect=False, move=False):
     from os import listdir, makedirs
@@ -40,7 +45,7 @@ def move_files(input_dir, output_dir, as_aspect=False, move=False):
         if as_aspect:
             aspect = get_image_aspect(in_file)
             if aspect:
-                clazz = "%d@%d" % aspect
+                clazz = aspect_folder(*aspect)
         else:
             size = get_image_size(in_file)
             if size:

wpclassifier/wpclassifier/cli.py

@@ -2,7 +2,7 @@
 import logging
 from optparse import OptionParser
 
-from wpclassifier import move_files
+from wpclassifier import move_files, aspect_folder
 
 LOG = logging.getLogger(__name__)
 
@@ -20,9 +20,20 @@ def main():
             'folder name, use the aspect ration as folder name. For '
             'cross-platform compatibility, the generated names will use "@" '
             'instead of ":" as separator (f. ex.: 16@9) Default: not-set')
+    parser.add_option('-s', '--show-aspect', dest='show_aspect',
+            metavar='SIZE',
+            default=None, help='Show the target folder for a given resolution '
+            'and exit. For example: SIZE=1680x1050')
 
     (options, args) = parser.parse_args()
 
+    if options.show_aspect:
+        tw, th = options.show_aspect.split('x')
+        target = aspect_folder(int(tw), int(th))
+        print "Pictures of size %s will be moved into %s" % (
+                options.show_aspect, target)
+        sys.exit(0)
+
     if len(args) != 2:
         parser.print_help()
         sys.exit(9)