split out logic for compressing message

Signed-off-by: Mattias Andrée <maandree@operamail.com>

src/ponysay.py

@@ -872,12 +872,39 @@ class Ponysay():
         print('%s %s' % ('ponysay', VERSION))
     
     
+    def __compressMessage(self, msg):
+        '''
+        This algorithm should give some result as cowsay's
+        
+        @param   msg:str  The message
+        @return  :str     The message compressed
+        '''
+        buf = ''
+        last = ' '
+        CHARS = '\t \n'
+        for c in msg:
+            if (c in CHARS) and (last in CHARS):
+                if last == '\n':
+                    buf += last
+                last = c
+            else:
+                buf += c
+                last = c
+        msg = buf.strip(CHARS)
+        buf = ''
+        for c in msg:
+            if (c != '\n') or (last != '\n'):
+                buf += c
+                last = c
+        return buf.replace('\n', '\n\n')
+    
+    
     def __useImage(self, pony):
         '''
         Convert image to the ponysay format if it is a regular image
         
-        @param  pony:str  The pony file
+        @param   pony:str  The pony file
-        @param  pony:str  The new pony file, or the old if it was already in the ponysay format
+        @return  :str      The new pony file, or the old if it was already in the ponysay format
         '''
         if endswith(pony.lower(), '.png'):
             pony = '\'' + pony.replace('\'', '\'\\\'\'') + '\''
@@ -926,24 +953,7 @@ class Ponysay():
         
         ## This algorithm should give some result as cowsay's (according to tests)
         if args.opts['-c'] is not None:
-            buf = ''
+            msg = self.__compressMessage(msg)
-            last = ' '
-            CHARS = '\t \n'
-            for c in msg:
-                if (c in CHARS) and (last in CHARS):
-                    if last == '\n':
-                        buf += last
-                    last = c
-                else:
-                    buf += c
-                    last = c
-            msg = buf.strip(CHARS)
-            buf = ''
-            for c in msg:
-                if (c != '\n') or (last != '\n'):
-                    buf += c
-                    last = c
-            msg = buf.replace('\n', '\n\n')
         
         ## Print info
         printinfo('pony file: ' + pony)