appicon.diff

--- appicon.py	2015-01-23 02:21:33.000000000 +0900
+++ appicon2.py	2015-01-23 02:47:26.000000000 +0900
@@ -4,6 +4,7 @@
 import os
 import sys
 from wand.image import Image
+from wand.exceptions import BlobError, CoderError, MissingDelegateError
 
 DIMENSIONS = {
     'OSX': [
@@ -52,6 +53,8 @@
     ],
 }
 
+class PathReadOnlyError(Exception):
+    pass
 
 def create(src_path):
     src_path = os.path.abspath(src_path)
@@ -63,19 +66,38 @@
             else:
                 width, height = size
 
-            dest_path = os.path.join('app-icons', t, name)
-            dir_path = os.path.dirname(dest_path)
-            if not os.path.exists(dir_path):
-                os.makedirs(dir_path)
-
-            with Image(filename=src_path) as src_im:
-                src_im.strip()
-                src_im.resize(width, height)
-                src_im.save(filename=dest_path)
-
-            print('created {}'.format(dest_path))
-
-
+            try:
+                dest_path = os.path.join('app-icons', t, name)
+                dir_path = os.path.dirname(dest_path)
+                if not os.path.exists(dir_path):
+                    os.makedirs(dir_path)
+                if not os.access(dir_path, os.W_OK):
+                    raise PathReadOnlyError("Unable to write to path %s" % dir_path)
+            except OSError:
+                print("Unable to create output directory %s" % dir_path)
+                return 1
+            except PathReadOnlyError:
+                print("Output directory %s is not writeable" % dir_path)
+                return 1
+
+            try:
+                with Image(filename=src_path) as src_im:
+                    src_im.strip()
+                    src_im.resize(width, height)
+                    src_im.save(filename=dest_path)
+                    print('Created {}'.format(dest_path))
+            except BlobError:
+                print('Input file %s does not exist.' % src_path)
+                return 1
+            except MissingDelegateError:
+                print('Input file %s is not a supported format.' % src_path)
+                return 1
+            except CoderError as e:
+                print('Unable to write to destination file %s' % dest_path)
+            except Exception as e:
+                print(e)
+            
+    return 0
 
 if __name__ == '__main__':
     try:
@@ -84,5 +106,5 @@
         print('usage> {} <image-path>'.format(sys.argv[0]), file=sys.stderr)
         sys.exit(1)
 
-    create(src_path)
+    sys.exit(create(src_path))