Feat: 添加 CommandStart 依赖注入参数 (#915)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: yanyongyu <42488585+yanyongyu@users.noreply.github.com>

nonebot/consts.py

@@ -28,6 +28,8 @@ RAW_CMD_KEY: Literal["raw_command"] = "raw_command"
 """命令文本存储 key"""
 CMD_ARG_KEY: Literal["command_arg"] = "command_arg"
 """命令参数存储 key"""
+CMD_START_KEY: Literal["command_start"] = "command_start"
+"""命令开头存储 key"""
 
 SHELL_ARGS: Literal["_args"] = "_args"
 """shell 命令 parse 后参数字典存储 key"""

nonebot/params.py

@@ -32,6 +32,7 @@ from nonebot.consts import (
     CMD_ARG_KEY,
     RAW_CMD_KEY,
     REGEX_GROUP,
+    CMD_START_KEY,
     REGEX_MATCHED,
 )
 
@@ -99,6 +100,15 @@ def CommandArg() -> Any:
     return Depends(_command_arg)
 
 
+def _command_start(state: T_State) -> str:
+    return state[PREFIX_KEY][CMD_START_KEY]
+
+
+def CommandStart() -> str:
+    """消息命令开头"""
+    return Depends(_command_start)
+
+
 def _shell_command_args(state: T_State) -> Any:
     return state[SHELL_ARGS]
 

nonebot/rule.py

@@ -14,7 +14,7 @@ from itertools import product
 from argparse import Namespace
 from typing_extensions import TypedDict
 from argparse import ArgumentParser as ArgParser
-from typing import Any, List, Tuple, Union, Optional, Sequence
+from typing import Any, List, Tuple, Union, Optional, Sequence, NamedTuple
 
 from pygtrie import CharTrie
 
@@ -41,6 +41,7 @@ from nonebot.consts import (
     CMD_ARG_KEY,
     RAW_CMD_KEY,
     REGEX_GROUP,
+    CMD_START_KEY,
     REGEX_MATCHED,
 )
 
@@ -50,15 +51,20 @@ CMD_RESULT = TypedDict(
         "command": Optional[Tuple[str, ...]],
         "raw_command": Optional[str],
         "command_arg": Optional[Message[MessageSegment]],
+        "command_start": Optional[str],
     },
 )
 
+TRIE_VALUE = NamedTuple(
+    "TRIE_VALUE", [("command_start", str), ("command", Tuple[str, ...])]
+)
+
 
 class TrieRule:
     prefix: CharTrie = CharTrie()
 
     @classmethod
-    def add_prefix(cls, prefix: str, value: Any):
+    def add_prefix(cls, prefix: str, value: TRIE_VALUE) -> None:
         if prefix in cls.prefix:
             logger.warning(f'Duplicated prefix rule "{prefix}"')
             return
@@ -66,7 +72,9 @@ class TrieRule:
 
     @classmethod
     def get_value(cls, bot: Bot, event: Event, state: T_State) -> CMD_RESULT:
-        prefix = CMD_RESULT(command=None, raw_command=None, command_arg=None)
+        prefix = CMD_RESULT(
+            command=None, raw_command=None, command_arg=None, command_start=None
+        )
         state[PREFIX_KEY] = prefix
         if event.get_type() != "message":
             return prefix
@@ -76,9 +84,11 @@ class TrieRule:
         if message_seg.is_text():
             segment_text = str(message_seg).lstrip()
             pf = cls.prefix.longest_prefix(segment_text)
-            prefix[RAW_CMD_KEY] = pf.key
+            if pf:
-            prefix[CMD_KEY] = pf.value
+                value: TRIE_VALUE = pf.value
-            if pf.key:
+                prefix[RAW_CMD_KEY] = pf.key
+                prefix[CMD_START_KEY] = value.command_start
+                prefix[CMD_KEY] = value.command
                 msg = message.copy()
                 msg.pop(0)
                 new_message = msg.__class__(segment_text[len(pf.key) :].lstrip())
@@ -292,10 +302,12 @@ def command(*cmds: Union[str, Tuple[str, ...]]) -> Rule:
 
         if len(command) == 1:
             for start in command_start:
-                TrieRule.add_prefix(f"{start}{command[0]}", command)
+                TrieRule.add_prefix(f"{start}{command[0]}", TRIE_VALUE(start, command))
         else:
             for start, sep in product(command_start, command_sep):
-                TrieRule.add_prefix(f"{start}{sep.join(command)}", command)
+                TrieRule.add_prefix(
+                    f"{start}{sep.join(command)}", TRIE_VALUE(start, command)
+                )
 
     return Rule(CommandRule(commands))
 
@@ -416,10 +428,12 @@ def shell_command(
 
         if len(command) == 1:
             for start in command_start:
-                TrieRule.add_prefix(f"{start}{command[0]}", command)
+                TrieRule.add_prefix(f"{start}{command[0]}", TRIE_VALUE(start, command))
         else:
             for start, sep in product(command_start, command_sep):
-                TrieRule.add_prefix(f"{start}{sep.join(command)}", command)
+                TrieRule.add_prefix(
+                    f"{start}{sep.join(command)}", TRIE_VALUE(start, command)
+                )
 
     return Rule(ShellCommandRule(commands, parser))
 

tests/plugins/param/param_state.py

@@ -8,6 +8,7 @@ from nonebot.params import (
     CommandArg,
     RawCommand,
     RegexGroup,
+    CommandStart,
     RegexMatched,
     ShellCommandArgs,
     ShellCommandArgv,
@@ -30,6 +31,10 @@ async def command_arg(cmd_arg: Message = CommandArg()) -> Message:
     return cmd_arg
 
 
+async def command_start(start: str = CommandStart()) -> str:
+    return start
+
+
 async def shell_command_args(
     shell_command_args: dict = ShellCommandArgs(),
 ) -> dict:

tests/test_param.py

@@ -122,6 +122,7 @@ async def test_state(app: App, load_plugin):
         CMD_ARG_KEY,
         RAW_CMD_KEY,
         REGEX_GROUP,
+        CMD_START_KEY,
         REGEX_MATCHED,
     )
     from plugins.param.param_state import (
@@ -131,6 +132,7 @@ async def test_state(app: App, load_plugin):
         command_arg,
         raw_command,
         regex_group,
+        command_start,
         regex_matched,
         shell_command_args,
         shell_command_argv,
@@ -138,7 +140,12 @@ async def test_state(app: App, load_plugin):
 
     fake_message = make_fake_message()("text")
     fake_state = {
-        PREFIX_KEY: {CMD_KEY: ("cmd",), RAW_CMD_KEY: "/cmd", CMD_ARG_KEY: fake_message},
+        PREFIX_KEY: {
+            CMD_KEY: ("cmd",),
+            RAW_CMD_KEY: "/cmd",
+            CMD_START_KEY: "/",
+            CMD_ARG_KEY: fake_message,
+        },
         SHELL_ARGV: ["-h"],
         SHELL_ARGS: {"help": True},
         REGEX_MATCHED: "[cq:test,arg=value]",
@@ -168,6 +175,12 @@ async def test_state(app: App, load_plugin):
         ctx.pass_params(state=fake_state)
         ctx.should_return(fake_state[PREFIX_KEY][CMD_ARG_KEY])
 
+    async with app.test_dependent(
+        command_start, allow_types=[StateParam, DependParam]
+    ) as ctx:
+        ctx.pass_params(state=fake_state)
+        ctx.should_return(fake_state[PREFIX_KEY][CMD_START_KEY])
+
     async with app.test_dependent(
         shell_command_argv, allow_types=[StateParam, DependParam]
     ) as ctx:

website/docs/tutorial/plugin/create-handler.md

@@ -256,6 +256,25 @@ async def _(foo: Message = CommandArg()): ...
 命令详情只能在首次接收到命令型消息时获取，如果在事件处理后续流程中获取，则会获取到不同的值。
 :::
 
+### CommandStart
+
+获取命令型消息命令前缀。
+
+```python {8}
+from nonebot import on_command
+from nonebot.adapters import Message
+from nonebot.params import CommandStart
+
+matcher = on_command("cmd")
+
+@matcher.handle()
+async def _(foo: str = CommandStart()): ...
+```
+
+:::tip 提示
+命令详情只能在首次接收到命令型消息时获取，如果在事件处理后续流程中获取，则会获取到不同的值。
+:::
+
 ### ShellCommandArgs
 
 获取 shell 命令解析后的参数。