Merge pull request 'fix: support empty string literals in textfx' (#63) from pi-agent/konabot:fix/textfx-empty-string into master

Reviewed-on: mttu-developers/konabot#63

konabot/plugins/handle_text/base.py

@@ -161,9 +161,9 @@ class PipelineRunner:
             "'": "'",
         }
 
-        def flush_word():
+        def flush_word(force: bool = False):
             nonlocal buf
-            if buf:
+            if buf or force:
                 tokens.append(Token(TokenKind.WORD, buf))
                 buf = ""
 
@@ -178,6 +178,7 @@ class PipelineRunner:
                     escape = True
                 elif c == quote:
                     quote = None
+                    flush_word(force=True)  # 引号闭合时强制 flush，即使是空字符串
                 else:
                     buf += c
                 i += 1
@@ -188,7 +189,7 @@ class PipelineRunner:
                 i += 1
                 continue
 
-            if c.isspace() or c in "  ":
+            if c.isspace():
                 flush_word()
                 i += 1
                 continue

konabot/plugins/handle_text/handlers/unix_handlers.py

@@ -13,10 +13,8 @@ class THEcho(TextHandler):
     async def handle(
         self, env: TextHandlerEnvironment, istream: str | None, args: list[str]
     ) -> TextHandleResult:
-        if len(args) == 0 and istream is None:
-            return TextHandleResult(1, "请在 echo 后面添加需要输出的文本")
-        if istream is not None:
-            return TextHandleResult(0, "\n".join([istream] + args))
+        # echo 不读 stdin，只输出参数（Unix 语义）
+        # 无参数时输出空行（与 Unix echo 行为一致）
         return TextHandleResult(0, "\n".join(args))
 
 

tests/test_textfx_shell.py

@@ -205,3 +205,21 @@ async def test_while_body_can_use_if(runner: PipelineRunner):
     assert not isinstance(parsed, str)
     results = await runner.run_pipeline(parsed, None, TextHandlerEnvironment(False))
     assert results[0].code == 1
+
+
+@pytest.mark.asyncio
+async def test_echo_empty_string(runner: PipelineRunner):
+    """测试 echo 空字符串"""
+    # 双引号空字符串
+    parsed = runner.parse_pipeline('echo ""')
+    assert not isinstance(parsed, str)
+    results = await runner.run_pipeline(parsed, None, TextHandlerEnvironment(False))
+    assert results[0].code == 0
+    assert results[0].ostream == ''
+    
+    # 单引号空字符串
+    parsed2 = runner.parse_pipeline("echo ''")
+    assert not isinstance(parsed2, str)
+    results2 = await runner.run_pipeline(parsed2, None, TextHandlerEnvironment(False))
+    assert results2[0].code == 0
+    assert results2[0].ostream == ''