fixed chums bug...maybe?

INSTALL

@@ -16,8 +16,12 @@ If you are building on Windows, the setup.py file has some
 commented-out lines that should give you a clue as to what you need to
 do. Talk to me if you reeeeally want to build on Windows.
 
-If you are building on Linux, the setup.py file will do some of the
-work, but you'll need to copy necessary files manually.
+On Linux, you need to have the PyQt4 and pygame libraries installed:
+
+Debian: apt-get install python-qt4 python-pgame
+Arch: pacman -S pyqt4 python-pygame
+
+then run ./pesterchum (basically a shell script that runs python pesterchum.py)
 
 The point of all this is that the only person besides myself that I
 expect to create builds are the awesome people that volunteer to help

pesterchum.py

@@ -108,6 +108,7 @@ class PesterLog(object):
 
 class PesterProfileDB(dict):
     def __init__(self):
+        self.filemutex = QtCore.QMutex()
         if sys.platform != "darwin":
             self.logpath = "logs"
         else:
@@ -122,14 +123,26 @@ class PesterProfileDB(dict):
             fp = open("%s/chums.js" % (self.logpath), 'w')
             json.dump(chumdict, fp)
             fp.close()
+        except ValueError:
+            chumdict = {}
+            fp = open("%s/chums.js" % (self.logpath), 'w')
+            json.dump(chumdict, fp)
+            fp.close()
+            
         converted = dict([(handle, PesterProfile(handle, color=QtGui.QColor(c['color']), mood=Mood(c['mood']))) for (handle, c) in chumdict.iteritems()])
         self.update(converted)
 
     def save(self):
+        self.filemutex.lock()
+        try:
             fp = open("%s/chums.js" % (self.logpath), 'w')
             chumdict = dict([p.plaindict() for p in self.itervalues()])
             json.dump(chumdict, fp)
             fp.close()
+        except Exception, e:
+            self.filemutex.unlock()
+            raise e
+        self.filemutex.unlock()
     def getColor(self, handle, default=None):
         if not self.has_key(handle):
             return default