fix(filesystem): add pifs ask and chat commands

tests/test_pifs_cli.py

@@ -0,0 +1,113 @@
+from pathlib import Path
+
+
+class FakeFileSystem:
+    def __init__(self, workspace):
+        self.workspace = Path(workspace)
+
+
+def test_cli_passthrough_invokes_pifs_command_executor(monkeypatch, capsys, tmp_path):
+    from pageindex.filesystem import cli
+
+    workspace = tmp_path / "workspace"
+    executor_instances = []
+
+    class FakeExecutor:
+        def __init__(self, filesystem, *, json_output=False):
+            self.filesystem = filesystem
+            self.json_output = json_output
+            self.commands = []
+            executor_instances.append(self)
+
+        def execute(self, command):
+            self.commands.append(command)
+            return f"executed:{command}"
+
+    monkeypatch.setattr(cli, "PageIndexFileSystem", FakeFileSystem)
+    monkeypatch.setattr(cli, "PIFSCommandExecutor", FakeExecutor)
+
+    status = cli.main(["--workspace", str(workspace), "ls", "/documents", "--json"])
+
+    assert status == 0
+    assert capsys.readouterr().out == "executed:ls /documents\n"
+    assert len(executor_instances) == 1
+    assert executor_instances[0].filesystem.workspace == workspace
+    assert executor_instances[0].json_output is True
+    assert executor_instances[0].commands == ["ls /documents"]
+
+
+def test_cli_ask_invokes_agent_with_question(monkeypatch, capsys, tmp_path):
+    from pageindex.filesystem import cli
+
+    workspace = tmp_path / "workspace"
+    agent_calls = []
+
+    def fake_run_pifs_agent(filesystem, question, **kwargs):
+        agent_calls.append((filesystem, question, kwargs))
+        return "agent answer"
+
+    monkeypatch.setattr(cli, "PageIndexFileSystem", FakeFileSystem)
+    monkeypatch.setattr(cli, "run_pifs_agent", fake_run_pifs_agent)
+
+    status = cli.main(
+        [
+            "ask",
+            "--workspace",
+            str(workspace),
+            "--model",
+            "test-model",
+            "--stream-mode",
+            "tools",
+            "--max-turns",
+            "7",
+            "--max-seconds",
+            "3.5",
+            "--reasoning-effort",
+            "low",
+            "--reasoning-summary",
+            "concise",
+            "What",
+            "is",
+            "inside?",
+        ]
+    )
+
+    assert status == 0
+    assert capsys.readouterr().out == "agent answer\n"
+    filesystem, question, kwargs = agent_calls[0]
+    assert filesystem.workspace == workspace
+    assert question == "What is inside?"
+    assert kwargs == {
+        "model": "test-model",
+        "stream_mode": "tools",
+        "max_turns": 7,
+        "max_seconds": 3.5,
+        "reasoning_effort": "low",
+        "reasoning_summary": "concise",
+    }
+
+
+def test_cli_chat_runs_one_question_and_exits(monkeypatch, capsys, tmp_path):
+    from pageindex.filesystem import cli
+
+    workspace = tmp_path / "workspace"
+    inputs = iter(["", "Summarize the workspace", "exit"])
+    agent_calls = []
+
+    def fake_run_pifs_agent(filesystem, question, **kwargs):
+        agent_calls.append((filesystem, question, kwargs))
+        return f"answer:{question}"
+
+    monkeypatch.setattr(cli, "PageIndexFileSystem", FakeFileSystem)
+    monkeypatch.setattr(cli, "run_pifs_agent", fake_run_pifs_agent)
+    monkeypatch.setattr("builtins.input", lambda prompt="": next(inputs))
+
+    status = cli.main(["chat", "--workspace", str(workspace), "--model", "test-model"])
+
+    assert status == 0
+    assert capsys.readouterr().out == "answer:Summarize the workspace\n"
+    assert len(agent_calls) == 1
+    filesystem, question, kwargs = agent_calls[0]
+    assert filesystem.workspace == workspace
+    assert question == "Summarize the workspace"
+    assert kwargs["model"] == "test-model"