Improve command handler + doc strstr

pits.py

@@ -27,11 +27,27 @@ def get_file_path(file_name):
 
 
 def strstr(haystack, needle):
+    """
+    Return a sub-string of haystack, going from first occurence of needle until the end.
+    Return None if not found.
+
+    Arguments:
+        haystack {string} -- the entry string
+        needle {string} -- the part of string searched
+
+    Returns:
+        string -- sub-string of haystack, starting from needle. None if not exist.
+
+    Examples:
+        email  = 'name@example.com'
+        domain = strstr(email, '@');
+        print(domain) // Display : @example.com
+    """
     pos = haystack.find(needle)
     if pos < 0: # not found
         return None
-    else:
-        return haystack[pos:]
+
+    return haystack[pos:]
 
 def create_connection(db_filename):
     db_path = get_file_path(db_filename)
@@ -103,15 +119,16 @@ def pit_help(args, *_):
     # TODO help
 
 def main():
-    command = [ 'project', 'task', 'note', 'log', 'info', 'help', 'version', 'init' ]
-    handler = [
-        project.handle_project,
-        task.handle_task,
-        note.handle_note,
-        action.handle_action,
-        info,
-        pit_help,
-        version]
+    cmd_handler = [
+        ('project', project.handle_project),
+        ('task', task.handle_task),
+        ('note', note.handle_note),
+        ('log', action.handle_action),
+        ('info', info),
+        ('help', pit_help),
+        ('version', version),
+        ('init', init)
+    ]
     candidate = -1
 
     argv = sys.argv
@@ -120,8 +137,8 @@ def main():
         argv.append('help')
         argv.append(None)
 
-    for i in range(len(command)):
-        if strstr(command[i], argv[1]) == command[i]:
+    for i in range(len(cmd_handler)):
+        if strstr(cmd_handler[i][0], argv[1]) == cmd_handler[i][0]:
             if candidate < 0:
                 candidate = i
             else:
@@ -132,7 +149,7 @@ def main():
         print("Invalid command ({}), run '{} help' for help".format(argv[1], os.path.basename(__file__)))
         sys.exit(1)
 
-    if candidate == (len(command) -1):
+    if candidate == (len(cmd_handler) -1):
         init()
         sys.exit(0)
 
@@ -141,7 +158,7 @@ def main():
     logging.debug('Last action: {}'.format(last_action))
     logging.debug(argv)
     logging.debug(argv[2:])
-    handler[candidate](argv[2:], last_action, conn)
+    cmd_handler[candidate][1](argv[2:], last_action, conn)
 
     conn.commit()
     conn.close()