Make command dispatching process clearer

commands/natural_language.py

@@ -4,7 +4,7 @@ import importlib
 from command import CommandRegistry
 from commands import core
 from nl_processor import parse_potential_commands
-from little_shit import get_nl_processors_dir
+from little_shit import get_nl_processors_dir, get_fallback_command_after_nl_processors
 from command import hub as cmdhub
 
 
@@ -14,10 +14,12 @@ def _init():
 
 __registry__ = cr = CommandRegistry(init_func=_init)
 
+_fallback_command = get_fallback_command_after_nl_processors()
+
 
 @cr.register('process')
 @cr.restrict(full_command_only=True)
-def process(args_text, ctx_msg, internal=False):
+def process(args_text, ctx_msg):
     sentence = args_text.strip()
     potential_commands = parse_potential_commands(sentence)
     potential_commands = sorted(filter(lambda x: x[0] > 60, potential_commands), key=lambda x: x[0], reverse=True)
@@ -25,19 +27,20 @@ def process(args_text, ctx_msg, internal=False):
         most_possible_cmd = potential_commands[0]
         core.echo(
             '识别出最可能的等价命令：\n' + ' '.join((most_possible_cmd[1], most_possible_cmd[2])),
-            ctx_msg,
-            internal
+            ctx_msg
         )
         ctx_msg['parsed_data'] = most_possible_cmd[3]
         cmdhub.call(most_possible_cmd[1], most_possible_cmd[2], ctx_msg)
     else:
         if ctx_msg.get('from_voice'):
-            core.echo('暂时无法理解你的意思，下面将发送图灵机器人的回复……', ctx_msg, internal)
-            core.tuling123(sentence, ctx_msg, internal)
-        else:
-            core.echo('暂时无法理解你的意思。\n'
-                      '由于自然语言识别还非常不完善，建议使用命令来精确控制我。\n'
-                      '如需帮助请发送「使用帮助」。', ctx_msg, internal)
+            # Special for voice message
+            if _fallback_command:
+                core.echo('暂时无法理解你的意思，下面将使用备用命令 ' + _fallback_command + '……', ctx_msg)
+                cmdhub.call(_fallback_command, sentence, ctx_msg)
+                return
+        core.echo('暂时无法理解你的意思。\n'
+                  '由于自然语言识别还非常不完善，建议使用命令来精确控制我。\n'
+                  '如需帮助请发送「使用帮助」。', ctx_msg)
 
 
 def _load_processors():

config.py

@@ -1,6 +1,7 @@
 config = {
     'fallback_command': 'natural_language.process',
-    'command_start_flags': ('/', '／', '来，', '来,'),
+    'fallback_command_after_nl_processors': 'core.tuling123',
+    'command_start_flags': ('/', '／', '来，', '来,'),  # add '' (empty string) here to allow commands without start flags
     'command_name_separators': ('\.', '->', '::', '/'),  # Regex
     'command_args_start_flags': ('，', '：', ',', ', ', ':', ': '),  # Regex
 }

filters/command_dispatcher_0.py

@@ -3,14 +3,13 @@ import sys
 import importlib
 
 import interactive
-from config import config
 from filter import as_filter
 from command import CommandNotExistsError, CommandScopeError, CommandPermissionError
 from little_shit import *
 from commands import core
 from command import hub as cmdhub
 
-_fallback_command = config.get('fallback_command')
+_fallback_command = get_fallback_command()
 _command_start_flags = get_command_start_flags()
 _command_args_start_flags = get_command_args_start_flags()
 
@@ -42,7 +41,8 @@ def _dispatch_command(ctx_msg):
             if text.startswith(flag):
                 start_flag = flag
                 break
-        if not start_flag or len(text) <= len(start_flag):
+        if start_flag is None or len(text) <= len(start_flag):
+            # Note: use `start_flag is None` here because empty string is allowed to be the start flag
             # No command, check if a session exists
             if interactive.has_session(source):
                 command = [interactive.get_session(source).cmd, text]
@@ -60,7 +60,7 @@ def _dispatch_command(ctx_msg):
             if len(command) == 1:
                 # Add an empty argument
                 command.append('')
-            # Starting a new command, so remove any previous command session
+            # Starting a new command, so remove previous command session, if any
             interactive.remove_session(source)
 
         command[0] = command[0].lower()

little_shit.py

@@ -92,3 +92,11 @@ def get_command_name_separators():
 
 def get_command_args_start_flags():
     return tuple(sorted(('[ \t\n]',) + config['command_args_start_flags'], reverse=True))
+
+
+def get_fallback_command():
+    return config.get('fallback_command')
+
+
+def get_fallback_command_after_nl_processors():
+    return config.get('fallback_command_after_nl_processors')