add method to generate png sample of first page

.pydevproject

@@ -1,10 +1,8 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<?eclipse-pydev version="1.0"?>
-
-<pydev_project>
+<?eclipse-pydev version="1.0"?><pydev_project>
 <pydev_pathproperty name="org.python.pydev.PROJECT_SOURCE_PATH">
 <path>/domtabs</path>
 </pydev_pathproperty>
 <pydev_property name="org.python.pydev.PYTHON_PROJECT_VERSION">python 2.7</pydev_property>
-<pydev_property name="org.python.pydev.PYTHON_PROJECT_INTERPRETER">Default</pydev_property>
+<pydev_property name="org.python.pydev.PYTHON_PROJECT_INTERPRETER">venv_default</pydev_property>
 </pydev_project>

dominion_tabs.py

@@ -574,9 +574,10 @@ class DominionTabs:
             self.canvas.restoreState()
 
     def drawDividers(self,cards):
+        #split into pages
         cards = split(cards,self.numTabsVertical*self.numTabsHorizontal)
         self.odd = True
-        for pageCards in cards:
+        for pageNum,pageCards in enumerate(cards):
             #remember whether we start with odd or even divider for tab location
             pageStartOdd = self.odd
             if not self.options.tabs_only and self.options.order != "global":
@@ -590,6 +591,8 @@ class DominionTabs:
                 self.canvas.restoreState()
                 self.odd = not self.odd
             self.canvas.showPage()
+            if pageNum + 1 == self.options.num_pages:
+                break
             if self.options.tabs_only:
                 #no set names or card backs for label-only sheets
                 continue
@@ -606,6 +609,8 @@ class DominionTabs:
                 self.canvas.restoreState()
                 self.odd = not self.odd
             self.canvas.showPage()
+            if pageNum + 1 == self.options.num_pages:
+                break
 
 
 
@@ -672,6 +677,8 @@ class DominionTabs:
                           'option is not given, all base cards are placed in their own "Base" expansion')
         parser.add_option("--centre_expansion_dividers", action="store_true", dest="centre_expansion_dividers",
                           help='centre the tabs on expansion dividers')
+        parser.add_option("--num_pages", type="int", default=-1,
+                          help="stop generating after this many pages, -1 for all")
 
         options, args = parser.parse_args(argstring)
         if not options.cost:
@@ -691,6 +698,16 @@ class DominionTabs:
         x, y = dimensionsStr.upper().split('X', 1)
         return (float (x) * cm, float (y) * cm)
 
+    def generate_sample(self, options):
+        import cStringIO
+        from wand.image import Image
+        buf = cStringIO.StringIO()
+        options.num_pages = 1
+        self.generate(options, buf)
+        with Image(blob=buf.getvalue()) as sample:
+            sample.format = 'png'
+            sample.save(filename='sample.png')
+
     def generate(self,options,f):
         self.options = options
         size = self.options.size.upper()