Python 3 compatibility

launch.py

@@ -1,26 +1,26 @@
 #!/usr/bin/python
 import pickle
-import commands
 import sys
 import os
 import subprocess
+import collections
 from operator import itemgetter
 
 CACHE_FILE = os.getenv('HOME')+'/.launch'
 DMENU = "dmenu"
 TERM = "urxvt -e "
 CD_TERM = "urxvt -e zsh -c 'cd "
-FOLDERS = ["/home/shankar"]
+FOLDERS = [os.getenv('HOME')]
 EXT = {
-        '.txt':'urxvt -e vim',
-        '.sh':'urxvt -e vim',
-        '.py':'urxvt -e vim'
+        '.txt':TERM + 'nano',
+        '.sh':TERM + 'nano',
+        '.py':TERM + 'nano'
         }
-FILEBROWSER = "pcmanfm"
+FILEBROWSER = TERM + "ranger"
 
 
 def create_cache():
-    prog_list = commands.getoutput("dmenu_path").split("\n")
+    prog_list = subprocess.getoutput("dmenu_path").split("\n")
     dirlist = []
 
     for watchdir in FOLDERS:
@@ -34,14 +34,13 @@ def create_cache():
                      if not name.startswith('.'):
                          dirlist.append(os.path.join(root,name))
 
-    dirlist.append("update_dmen")
     dirlist.sort()
 
     return dict.fromkeys(prog_list + dirlist,0)
 
 
 def store(object,file):
-    with open(file, 'w') as f:
+    with open(file, 'wb') as f:
         pickle.dump(object,f)
     f.close()
 
@@ -52,7 +51,7 @@ def create_new(file):
 
 def retrieve(file,ifnotfound):
     try:
-        with open(file,'r+') as f:
+        with open(file,'rb') as f:
             obj = pickle.load(f)
         f.close()
         return(obj)
@@ -69,19 +68,20 @@ def update():
     store(cache_new,CACHE_FILE)
 
 def dmenu(pgm_list):
-    p = subprocess.Popen([DMENU,"-l","10"], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
-    out = p.communicate("\n".join(pgm_list))[0]
+    p = subprocess.Popen([DMENU], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
+    out = p.communicate(bytes("\n".join(pgm_list), "utf-8"))[0]
     return out
 
 
 def run():
     cache = retrieve(CACHE_FILE,create_new)
-    sorted_list = sorted(cache.iteritems(), key=itemgetter(1), reverse=True)
-    pgm_list = [ x[0] for x in sorted_list ]
-    out = dmenu(pgm_list)
+    pgm_list = cache.keys()
+    bytes = dmenu(pgm_list)
+    out = bytes.decode("utf-8")[:-1]
     if len(out) > 0 :
-        if out == "update_dmen":
+        if out == ";":
             update()
+            run()
         elif out.endswith(';'):
             out = out[:-1]
             if os.path.isdir(out):
@@ -100,10 +100,12 @@ def run():
         else:
             os.system(out + " &")
 
-        if not cache.has_key(out):
+        if out not in cache:
             cache[out] = 0
         cache[out] += 1
-        store(cache,CACHE_FILE)
+        sorted_cache = sorted(cache.items(), key=itemgetter(1), reverse=True)
+        ordered_cache = collections.OrderedDict(sorted_cache)
+        store(ordered_cache,CACHE_FILE)
 
 run()