refactor(cli): replace InquirerPy with an in-house fuzzy picker

InquirerPy was a thin wrapper around prompt_toolkit, which was already a transitive dependency and is what the existing tests drove the widget through directly. Removes the InquirerPy (and its pfzy) dependency and reimplements the same type-to-filter/tab-to-toggle/ enter-to-confirm interaction directly on prompt_toolkit's Application and KeyBindings primitives in a new fuzzy_picker.py module, matching every existing test scenario exactly (single-select, multiselect toggling, filtering across matches). Along the way, fixed a real bug the port introduced: the cancel handler returned an empty result, which _fuzzy_pick's calling code in wizard.py treats as "please pick again," looping forever waiting for input that was never coming. Ctrl-C/Ctrl-D now raise KeyboardInterrupt instead, matching how interactive prompts conventionally cancel.
2026-09-14 23:21:35 +00:00 · 2026-07-15 22:12:54 -07:00 · 2026-07-15 22:12:54 -07:00 · 0ba155fb03
commit 0ba155fb03
parent 9d2ed13355
6 changed files with 277 additions and 107 deletions
--- a/litellm/proxy/client/cli/commands/autoroute/fuzzy_picker.py
+++ b/litellm/proxy/client/cli/commands/autoroute/fuzzy_picker.py
@ -0,0 +1,165 @@
+from dataclasses import dataclass, field
+
+from prompt_toolkit.application import Application
+from prompt_toolkit.formatted_text import StyleAndTextTuples
+from prompt_toolkit.key_binding import KeyBindings
+from prompt_toolkit.key_binding.key_processor import KeyPressEvent
+from prompt_toolkit.keys import Keys
+from prompt_toolkit.layout import HSplit, Layout, Window
+from prompt_toolkit.layout.controls import FormattedTextControl
+from prompt_toolkit.styles import Style
+
+_MAX_VISIBLE_ROWS = 15
+
+_STYLE = Style.from_dict(
+    {
+        "prompt": "bold",
+        "highlighted": "reverse",
+        "hint": "fg:ansibrightblack",
+    }
+)
+
+
+def _fuzzy_match(query: str, choices: tuple[str, ...]) -> tuple[str, ...]:
+    """fzf-style subsequence filter: query chars must appear in order (not necessarily contiguous)
+    in a choice, case-insensitive. Preserves the choices' original relative order among matches."""
+    if not query:
+        return choices
+    needle = query.lower()
+
+    def _matches(choice: str) -> bool:
+        haystack = choice.lower()
+        pos = 0
+        for ch in needle:
+            pos = haystack.find(ch, pos)
+            if pos == -1:
+                return False
+            pos += 1
+        return True
+
+    return tuple(choice for choice in choices if _matches(choice))
+
+
+@dataclass
+class _PickerState:
+    all_choices: tuple[str, ...]
+    multiselect: bool
+    query: str = ""
+    cursor: int = 0
+    selected: set[str] = field(default_factory=set)
+
+    @property
+    def filtered(self) -> tuple[str, ...]:
+        return _fuzzy_match(self.query, self.all_choices)
+
+
+def _confirmed_selection(state: _PickerState) -> list[str]:
+    if state.multiselect:
+        return [choice for choice in state.all_choices if choice in state.selected]
+    filtered = state.filtered
+    return [filtered[state.cursor]] if filtered else []
+
+
+def _cancel(event: KeyPressEvent, state: _PickerState) -> None:
+    event.app.exit(exception=KeyboardInterrupt)
+
+
+def _confirm(event: KeyPressEvent, state: _PickerState) -> None:
+    event.app.exit(result=_confirmed_selection(state))
+
+
+def _toggle(event: KeyPressEvent, state: _PickerState) -> None:
+    if not state.multiselect:
+        return
+    filtered = state.filtered
+    if filtered:
+        state.selected.symmetric_difference_update({filtered[state.cursor]})
+
+
+def _move_up(event: KeyPressEvent, state: _PickerState) -> None:
+    state.cursor = max(0, state.cursor - 1)
+
+
+def _move_down(event: KeyPressEvent, state: _PickerState) -> None:
+    state.cursor = min(max(0, len(state.filtered) - 1), state.cursor + 1)
+
+
+def _backspace(event: KeyPressEvent, state: _PickerState) -> None:
+    state.query = state.query[:-1]
+    state.cursor = 0
+
+
+def _type_char(event: KeyPressEvent, state: _PickerState) -> None:
+    if event.data and event.data.isprintable():
+        state.query += event.data
+        state.cursor = 0
+
+
+def _build_key_bindings(state: _PickerState) -> KeyBindings:
+    kb = KeyBindings()
+    kb.add("c-c")(lambda event: _cancel(event, state))
+    kb.add("c-d")(lambda event: _cancel(event, state))
+    kb.add("enter")(lambda event: _confirm(event, state))
+    kb.add("tab")(lambda event: _toggle(event, state))
+    kb.add("up")(lambda event: _move_up(event, state))
+    kb.add("c-p")(lambda event: _move_up(event, state))
+    kb.add("down")(lambda event: _move_down(event, state))
+    kb.add("c-n")(lambda event: _move_down(event, state))
+    kb.add("backspace")(lambda event: _backspace(event, state))
+    kb.add(Keys.Any)(lambda event: _type_char(event, state))
+    return kb
+
+
+def _prompt_text(state: _PickerState, message: str) -> StyleAndTextTuples:
+    toggle_hint = "tab to toggle, " if state.multiselect else ""
+    return [
+        ("class:prompt", f"{message}: "),
+        ("", state.query),
+        ("class:hint", f"  ({toggle_hint}type to filter, enter to confirm)"),
+    ]
+
+
+def _visible_window(state: _PickerState, filtered: tuple[str, ...]) -> tuple[int, tuple[str, ...]]:
+    state.cursor = min(state.cursor, len(filtered) - 1)
+    start = max(0, min(state.cursor - _MAX_VISIBLE_ROWS + 1, len(filtered) - _MAX_VISIBLE_ROWS))
+    return start, filtered[start : start + _MAX_VISIBLE_ROWS]
+
+
+def _choices_text(state: _PickerState) -> StyleAndTextTuples:
+    filtered = state.filtered
+    if not filtered:
+        return [("class:hint", "  (no matches)")]
+    start, visible = _visible_window(state, filtered)
+    lines: StyleAndTextTuples = []
+    for offset, choice in enumerate(visible):
+        index = start + offset
+        marker = "> " if index == state.cursor else "  "
+        check = ("[x] " if choice in state.selected else "[ ] ") if state.multiselect else ""
+        style = "class:highlighted" if index == state.cursor else ""
+        lines.append((style, f"{marker}{check}{choice}\n"))
+    return lines
+
+
+def fuzzy_pick(choices: tuple[str, ...], message: str, multiselect: bool) -> list[str]:
+    """Interactive type-to-filter picker (fzf-style): type to narrow the list, arrow keys to move
+    the highlight, Enter to confirm. In multiselect mode, Tab toggles the highlighted item into the
+    result set and Enter confirms whatever has been toggled (not the bare highlight); Ctrl-C/Ctrl-D
+    raise KeyboardInterrupt rather than returning an empty result, so a cancel aborts the caller
+    instead of silently looping back to prompt again.
+    """
+    state = _PickerState(all_choices=choices, multiselect=multiselect)
+    layout = Layout(
+        HSplit(
+            [
+                Window(content=FormattedTextControl(lambda: _prompt_text(state, message)), height=1),
+                Window(content=FormattedTextControl(lambda: _choices_text(state))),
+            ]
+        )
+    )
+    app: Application[list[str]] = Application(
+        layout=layout, key_bindings=_build_key_bindings(state), style=_STYLE, full_screen=False
+    )
+    return app.run()
+
+
+__all__ = ["fuzzy_pick"]
--- a/litellm/proxy/client/cli/commands/autoroute/wizard.py
+++ b/litellm/proxy/client/cli/commands/autoroute/wizard.py
@ -3,8 +3,6 @@ from pathlib import Path

 import click
 import yaml
-from InquirerPy import inquirer
-from InquirerPy.base.control import Choice

 from .... import Client
 from .config import (
@ -22,6 +20,7 @@ from .config import (
    parse_discovered_models,
    validate_config,
 )
+from .fuzzy_picker import fuzzy_pick
 from .process import CONFIG_PATH, secure_create


@ -30,26 +29,19 @@ def _is_interactive() -> bool:


 def _fuzzy_pick(models: tuple[DiscoveredModel, ...], prompt_label: str, multiselect: bool) -> list[str]:
-    """Type-to-filter picker over a (possibly huge) model pool, using InquirerPy's fzf-style fuzzy prompt.
+    """Type-to-filter picker over a (possibly huge) model pool.

    A plain numbered table + typed index does not scale past a handful of models -- proxies with
    hundreds of model groups made that interaction unusable. This lets the user narrow the pool by
    typing a substring instead of scrolling/counting.

    Assumes the caller already checked interactivity (run_configure_wizard does, once, up front) --
-    checking here too would check the wrong thing under test, where InquirerPy is driven through its
-    own injected input/output rather than the real process stdin.
+    checking here too would check the wrong thing under test, where the picker is driven through
+    prompt_toolkit's own injected input/output rather than the real process stdin.
    """
-    choices = [Choice(value=model.name, name=model.name) for model in models]
-    toggle_hint = "tab to toggle, " if multiselect else ""
+    choices = tuple(model.name for model in models)
    while True:
-        result = inquirer.fuzzy(
-            message=f"{prompt_label}: type to filter, {toggle_hint}enter to confirm",
-            choices=choices,
-            multiselect=multiselect,
-            max_height="70%",
-        ).execute()
-        selected = result if multiselect else [result]
+        selected = fuzzy_pick(choices, prompt_label, multiselect)
        if selected:
            return selected
        click.echo("Select at least one model.")
--- a/pyproject.toml
+++ b/pyproject.toml
@ -66,7 +66,7 @@ proxy = [
    "litellm-enterprise==0.1.50",
    "RestrictedPython>=8.1,<9.0",
    "rich>=13.9.4,<14.0",
-    "InquirerPy>=0.3.4,<1.0",
+    "prompt-toolkit>=3.0.36,<4.0",
    "polars>=1.38.1,<2.0",
    "soundfile>=0.12.1,<1.0",
    "pyroscope-io>=0.8.16,<1.0; sys_platform != 'win32'",
@ -80,7 +80,7 @@ cli = [
    "rich>=13.9.4,<14.0",
    "pyyaml>=6.0.3,<7.0",
    "requests>=2.32.0,<3.0",
-    "InquirerPy>=0.3.4,<1.0",
+    "prompt-toolkit>=3.0.36,<4.0",
 ]
 extra_proxy = [
    "prisma>=0.11.0,<1.0",
--- a/tests/test_litellm/proxy/client/cli/autoroute/test_fuzzy_picker.py
+++ b/tests/test_litellm/proxy/client/cli/autoroute/test_fuzzy_picker.py
@ -0,0 +1,27 @@
+from litellm.proxy.client.cli.commands.autoroute.fuzzy_picker import _fuzzy_match
+
+
+class TestFuzzyMatch:
+    def test_empty_query_returns_all_choices_in_order(self):
+        choices = ("gpt-4o", "claude-opus", "o1")
+        assert _fuzzy_match("", choices) == choices
+
+    def test_exact_substring_matches(self):
+        choices = ("gpt-4o-mini", "gpt-4o", "claude-opus")
+        assert _fuzzy_match("gpt-4o", choices) == ("gpt-4o-mini", "gpt-4o")
+
+    def test_matches_as_a_subsequence_not_just_a_substring(self):
+        choices = ("gpt-4o-mini", "claude-opus")
+        assert _fuzzy_match("g4om", choices) == ("gpt-4o-mini",)
+
+    def test_is_case_insensitive(self):
+        choices = ("GPT-4o-Mini",)
+        assert _fuzzy_match("gpt4o", choices) == ("GPT-4o-Mini",)
+
+    def test_no_match_excludes_the_choice(self):
+        choices = ("gpt-4o", "claude-opus")
+        assert _fuzzy_match("xyz", choices) == ()
+
+    def test_preserves_original_relative_order_among_matches(self):
+        choices = ("z-model", "a-model", "m-model")
+        assert _fuzzy_match("model", choices) == ("z-model", "a-model", "m-model")
--- a/tests/test_litellm/proxy/client/cli/autoroute/test_wizard.py
+++ b/tests/test_litellm/proxy/client/cli/autoroute/test_wizard.py
@ -6,7 +6,6 @@ import click
 import pytest
 import yaml
 from click.testing import CliRunner
-from InquirerPy.base.control import Choice
 from prompt_toolkit.application import create_app_session
 from prompt_toolkit.input import create_pipe_input
 from prompt_toolkit.output import DummyOutput
@ -215,10 +214,10 @@ def _drive_fuzzy_pick(
    multiselect: bool,
    key_events: List[Tuple[str, float]],
 ) -> List[str]:
-    """Drives the real InquirerPy fuzzy prompt through prompt_toolkit's own test input/output,
+    """Drives the real fuzzy-picker widget through prompt_toolkit's own test input/output,
    exercising the actual widget (filtering, tab-to-toggle, enter-to-confirm) rather than mocking
    it away. asyncio.to_thread propagates the create_app_session context into the worker thread
-    running _fuzzy_pick's synchronous .execute() call."""
+    running fuzzy_pick's synchronous Application.run() call."""

    async def _run() -> List[str]:
        with create_pipe_input() as pipe_input:
@ -267,10 +266,19 @@ class TestFuzzyPickWidget:
        )
        assert set(result) == {"model-3", "model-15"}

-    def test_choice_wraps_name_and_value_to_the_same_model_name(self):
-        model = DiscoveredModel(name="only-model")
-        choice = Choice(value=model.name, name=model.name)
-        assert choice.value == choice.name == "only-model"
+    def test_down_arrow_moves_the_highlighted_match(self):
+        result = _drive_fuzzy_pick(
+            self._models(),
+            "test",
+            multiselect=False,
+            key_events=[("model-1", 0.3), ("\x1b[B", 0.1), ("\r", 0.1)],
+        )
+        # "model-1" fuzzy-matches model-1, model-10..19; one Down moves off model-1 to model-10
+        assert result == ["model-10"]
+
+    def test_raises_keyboard_interrupt_on_ctrl_c(self):
+        with pytest.raises(KeyboardInterrupt):
+            _drive_fuzzy_pick(self._models(), "test", multiselect=False, key_events=[("model-13", 0.3), ("\x03", 0.1)])


 class TestRenderAndPromptForModelWrappers:
--- a/uv.lock
+++ b/uv.lock
@ -10,7 +10,7 @@ resolution-markers = [
 ]

 [options]
-exclude-newer = "2026-07-13T03:38:04.421387Z"
+exclude-newer = "2026-07-13T04:54:35.730742Z"
 exclude-newer-span = "P3D"

 [manifest]
@ -222,9 +222,9 @@ name = "aiologic"
 version = "0.17.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "sniffio" },
+    { name = "sniffio", marker = "python_full_version < '3.13'" },
    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
-    { name = "wrapt" },
+    { name = "wrapt", marker = "python_full_version < '3.13'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/53/a7/809482759f40079f4c4328c7318bf569ae25d457f5017aad30a1b9aafedc/aiologic-0.17.0.tar.gz", hash = "sha256:65aa058e858c94cd208badb188e7f00b54dcabb3ba85b34f794db98074d108b9", size = 251625, upload-time = "2026-06-14T12:24:35.367Z" }
 wheels = [
@ -516,14 +516,14 @@ name = "aurelio-sdk"
 version = "0.0.19"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "aiofiles" },
-    { name = "aiohttp" },
-    { name = "colorlog" },
-    { name = "pydantic" },
-    { name = "python-dotenv" },
-    { name = "requests" },
-    { name = "requests-toolbelt" },
-    { name = "tornado" },
+    { name = "aiofiles", marker = "python_full_version < '3.14'" },
+    { name = "aiohttp", marker = "python_full_version < '3.14'" },
+    { name = "colorlog", marker = "python_full_version < '3.14'" },
+    { name = "pydantic", marker = "python_full_version < '3.14'" },
+    { name = "python-dotenv", marker = "python_full_version < '3.14'" },
+    { name = "requests", marker = "python_full_version < '3.14'" },
+    { name = "requests-toolbelt", marker = "python_full_version < '3.14'" },
+    { name = "tornado", marker = "python_full_version < '3.14'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/27/0e/c2e369ad173fb3d76448e46d10beb3dcc53388318933ddf8169a3f21a810/aurelio_sdk-0.0.19.tar.gz", hash = "sha256:14107e7440ff2efd0b4a08c52fb595e7680bd4bc973a0ddfb3b64157c6666b91", size = 15258, upload-time = "2025-03-24T14:37:32.203Z" }
 wheels = [
@ -1047,7 +1047,7 @@ name = "coloredlogs"
 version = "15.0.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "humanfriendly" },
+    { name = "humanfriendly", marker = "python_full_version < '3.14'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/cc/c7/eed8f27100517e8c0e6b923d5f0845d0cb99763da6fdee00478f91db7325/coloredlogs-15.0.1.tar.gz", hash = "sha256:7c991aa71a4577af2f82600d8f8f3a89f936baeaf9b50a9c197da014e5bf16b0", size = 278520, upload-time = "2021-06-11T10:22:45.202Z" }
 wheels = [
@ -1059,7 +1059,7 @@ name = "colorlog"
 version = "6.10.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "colorama", marker = "sys_platform == 'win32'" },
+    { name = "colorama", marker = "python_full_version < '3.14' and sys_platform == 'win32'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/a2/61/f083b5ac52e505dfc1c624eafbf8c7589a0d7f32daa398d2e7590efa5fda/colorlog-6.10.1.tar.gz", hash = "sha256:eb4ae5cb65fe7fec7773c2306061a8e63e02efc2c72eba9d27b0fa23c94f1321", size = 17162, upload-time = "2025-10-16T16:14:11.978Z" }
 wheels = [
@ -1420,7 +1420,7 @@ name = "culsans"
 version = "0.11.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "aiologic" },
+    { name = "aiologic", marker = "python_full_version < '3.13'" },
    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/d9/e3/49afa1bc180e0d28008ec6bcdf82a4072d1c7a41032b5b759b60814ca4b0/culsans-0.11.0.tar.gz", hash = "sha256:0b43d0d05dce6106293d114c86e3fb4bfc63088cfe8ff08ed3fe36891447fe33", size = 107546, upload-time = "2025-12-31T23:15:38.196Z" }
@ -2966,7 +2966,7 @@ name = "humanfriendly"
 version = "10.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "pyreadline3", marker = "sys_platform == 'win32'" },
+    { name = "pyreadline3", marker = "python_full_version < '3.14' and sys_platform == 'win32'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/cc/3f/2c29224acb2e2df4d2046e4c73ee2662023c58ff5b113c4c1adac0886c43/humanfriendly-10.0.tar.gz", hash = "sha256:6b0b831ce8f15f7300721aa49829fc4e83921a9a301cc7f606be6686a2288ddc", size = 360702, upload-time = "2021-09-17T21:40:43.31Z" }
 wheels = [
@ -3049,19 +3049,6 @@ wheels = [
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 ]

-[[package]]
-name = "inquirerpy"
-version = "0.3.4"
-source = { registry = "https://pypi.org/simple" }
-dependencies = [
-    { name = "pfzy" },
-    { name = "prompt-toolkit" },
-]
-sdist = { url = "https://files.pythonhosted.org/packages/64/73/7570847b9da026e07053da3bbe2ac7ea6cde6bb2cbd3c7a5a950fa0ae40b/InquirerPy-0.3.4.tar.gz", hash = "sha256:89d2ada0111f337483cb41ae31073108b2ec1e618a49d7110b0d7ade89fc197e", size = 44431, upload-time = "2022-06-27T23:11:20.598Z" }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/ce/ff/3b59672c47c6284e8005b42e84ceba13864aa0f39f067c973d1af02f5d91/InquirerPy-0.3.4-py3-none-any.whl", hash = "sha256:c65fdfbac1fa00e3ee4fb10679f4d3ed7a012abf4833910e63c295827fe2a7d4", size = 67677, upload-time = "2022-06-27T23:11:17.723Z" },
-]
-
 [[package]]
 name = "isodate"
 version = "0.7.2"
@ -3293,10 +3280,10 @@ name = "jsonschema-path"
 version = "0.3.4"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "pathable" },
-    { name = "pyyaml" },
-    { name = "referencing" },
-    { name = "requests" },
+    { name = "pathable", marker = "python_full_version < '3.14'" },
+    { name = "pyyaml", marker = "python_full_version < '3.14'" },
+    { name = "referencing", marker = "python_full_version < '3.14'" },
+    { name = "requests", marker = "python_full_version < '3.14'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/6e/45/41ebc679c2a4fced6a722f624c18d658dee42612b83ea24c1caf7c0eb3a8/jsonschema_path-0.3.4.tar.gz", hash = "sha256:8365356039f16cc65fddffafda5f58766e34bebab7d6d105616ab52bc4297001", size = 11159, upload-time = "2025-01-24T14:33:16.547Z" }
 wheels = [
@ -3767,7 +3754,7 @@ caching = [
    { name = "diskcache" },
 ]
 cli = [
-    { name = "inquirerpy" },
+    { name = "prompt-toolkit" },
    { name = "pyyaml" },
    { name = "requests" },
    { name = "rich" },
@ -3803,12 +3790,12 @@ proxy = [
    { name = "fastapi-sso" },
    { name = "granian" },
    { name = "gunicorn" },
-    { name = "inquirerpy" },
    { name = "litellm-enterprise" },
    { name = "litellm-proxy-extras" },
    { name = "mcp" },
    { name = "orjson" },
    { name = "polars" },
+    { name = "prompt-toolkit" },
    { name = "pydantic-settings" },
    { name = "pyjwt" },
    { name = "pynacl" },
@ -3981,8 +3968,6 @@ requires-dist = [
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    { name = "httpx", specifier = ">=0.28.0,<1.0" },
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