Added support for exact match in fuzzy prompt #34

InquirerPy/prompts/fuzzy.py

@@ -4,6 +4,7 @@
 from typing import Any, Callable, Dict, List, Optional, Tuple, Union, cast
 
 from pfzy import fuzzy_match
+from pfzy.score import fzy_scorer, substr_scorer
 from pfzy.types import HAYSTACKS
 from prompt_toolkit.application.application import Application
 from prompt_toolkit.buffer import Buffer
@@ -63,12 +64,14 @@ def __init__(
         session_result: Optional[InquirerPySessionResult],
         multiselect: bool,
         marker_pl: str,
+        match_exact: bool,
     ) -> None:
         self._pointer = pointer
         self._marker = marker
         self._marker_pl = marker_pl
         self._current_text = current_text
         self._max_lines = max_lines if max_lines > 0 else 1
+        self._scorer = fzy_scorer if not match_exact else substr_scorer
         super().__init__(
             choices=choices,
             default=None,
@@ -219,6 +222,7 @@ async def _filter_choices(self, wait_time: float) -> List[Dict[str, Any]]:
                 self._current_text(),
                 cast(HAYSTACKS, self.choices),
                 key="name",
+                scorer=self._scorer,
             )
         return choices
 
@@ -287,7 +291,9 @@ class FuzzyPrompt(BaseListPrompt):
             Setting to True will also change the result from a single value to a list of values.
         prompt: Input prompt symbol. Custom symbol to display infront of the input buffer to indicate for input.
         border: Create border around the choice window.
-        info: Display choice information similar to fzf --info=inline next tot he prompt.
+        info: Display choice information similar to fzf --info=inline next to the prompt.
+        match_exact: Use exact sub-string match instead of using fzy fuzzy match algorithm.
+        exact_symbol: Custom symbol to display in the info section when `info=True`.
         marker: Marker Symbol. Custom symbol to indicate if a choice is selected.
             This will take effects when `multiselect` is True.
         marker_pl: Marker place holder when the choice is not selected.
@@ -329,6 +335,8 @@ def __init__(
         marker_pl: str = " ",
         border: bool = False,
         info: bool = True,
+        match_exact: bool = False,
+        exact_symbol: str = " E",
         height: Union[str, int] = None,
         max_height: Union[str, int] = None,
         validate: InquirerPyValidate = None,
@@ -347,11 +355,13 @@ def __init__(
         self._info = info
         self._task = None
         self._rendered = False
+        self._exact_symbol = exact_symbol
 
         keybindings = {
             "up": [{"key": "up"}, {"key": "c-p"}],
             "down": [{"key": "down"}, {"key": "c-n"}],
             "toggle": [],
+            "toggle-exact": [],
             **keybindings,
         }
         super().__init__(
@@ -376,6 +386,7 @@ def __init__(
             mandatory_message=mandatory_message,
             session_result=session_result,
         )
+        self.kb_func_lookup = {"toggle-exact": [{"func": self._toggle_exact}]}
         self._default = (
             default
             if not isinstance(default, Callable)
@@ -395,6 +406,7 @@ def __init__(
             session_result=session_result,
             multiselect=multiselect,
             marker_pl=marker_pl,
+            match_exact=match_exact,
         )
 
         self._buffer = Buffer(on_text_changed=self._on_text_changed)
@@ -470,6 +482,23 @@ def __init__(
             after_render=self._after_render,
         )
 
+    def _toggle_exact(self, _, value: bool = None) -> None:
+        """Toggle matching algorithm.
+
+        Switch between fzy fuzzy match or sub-string exact match.
+
+        Args:
+            value: Specify the value to toggle.
+        """
+        if value is not None:
+            self.content_control._scorer = fzy_scorer if not value else substr_scorer
+        else:
+            self.content_control._scorer = (
+                fzy_scorer
+                if self.content_control._scorer == substr_scorer
+                else substr_scorer
+            )
+
     def _on_rendered(self, _) -> None:
         """Render callable choices and set the buffer default text.
 
@@ -503,17 +532,15 @@ def _generate_after_input(self) -> List[Tuple[str, str]]:
             display_message.append(
                 (
                     "class:fuzzy_info",
-                    "%s/%s"
-                    % (
-                        self.content_control.choice_count,
-                        len(self.content_control.choices),
-                    ),
+                    f"{self.content_control.choice_count}/{len(self.content_control.choices)}",
                 )
             )
             if self._multiselect:
                 display_message.append(
-                    ("class:fuzzy_info", " (%s)" % len(self.selected_choices))
+                    ("class:fuzzy_info", f" ({len(self.selected_choices)})")
                 )
+            if self.content_control._scorer == substr_scorer:
+                display_message.append(("class:fuzzy_info", self._exact_symbol))
         return display_message
 
     def _generate_before_input(self) -> List[Tuple[str, str]]:

docs/pages/prompts/fuzzy.md

@@ -88,6 +88,48 @@ choices = [
 ]
 ```
 
+## Exact Sub-String Match
+
+This prompt uses the [fzy](https://github.com/jhawthorn/fzy) fuzzy match algorithm by default. You can enable exact sub-string match
+by using the parameter `match_exact`.
+
+<details>
+  <summary>Classic Syntax (PyInquirer)</summary>
+
+```{code-block} python
+from InquirerPy import prompt
+
+questions = [
+    {
+        "type": "fuzzy",
+        "message": "Select actions:",
+        "choices": ["hello", "weather", "what", "whoa", "hey", "yo"],
+        "match_exact": True,
+        "exact_symbol": " E",   # indicator of exact match
+    },
+]
+
+result = prompt(questions=questions)
+```
+
+</details>
+
+<details open>
+  <summary>Alternate Syntax</summary>
+
+```{code-block} python
+from InquirerPy import inquirer
+
+result = inquirer.fuzzy(
+    message="Select actions:",
+    choices=["hello", "weather", "what", "whoa", "hey", "yo"],
+    match_exact=True,
+    exact_symbol=" E",  # indicator of exact match
+).execute()
+```
+
+</details>
+
 ## Reference
 
 ```{eval-rst}

tests/prompts/test_fuzzy.py

@@ -3,6 +3,7 @@
 from typing import Callable, NamedTuple
 from unittest.mock import ANY, MagicMock, call, patch
 
+from pfzy.score import fzy_scorer, substr_scorer
 from prompt_toolkit.application.application import Application
 from prompt_toolkit.buffer import Buffer
 from prompt_toolkit.layout.layout import Layout
@@ -27,6 +28,7 @@ class TestFuzzy(unittest.TestCase):
         session_result=None,
         multiselect=False,
         marker_pl=" ",
+        match_exact=False,
     )
 
     @patch("InquirerPy.utils.shutil.get_terminal_size")
@@ -179,6 +181,7 @@ def test_prompt_filter1(self):
             session_result=None,
             multiselect=False,
             marker_pl=" ",
+            match_exact=False,
         )
         self.assertEqual(
             content_control._filtered_choices,
@@ -292,6 +295,7 @@ def test_prompt_filter2(self):
             session_result=None,
             multiselect=False,
             marker_pl=" ",
+            match_exact=False,
         )
         content_control.choices[0]["indices"] = [1, 2, 3]
         asyncio.run(content_control._filter_choices(0.0))
@@ -381,6 +385,7 @@ def test_constructor(self, mocked_term, mocked_height, mocked_control):
             session_result=None,
             multiselect=False,
             marker_pl=" ",
+            match_exact=False,
         )
 
         prompt = FuzzyPrompt(
@@ -411,6 +416,7 @@ def test_constructor(self, mocked_term, mocked_height, mocked_control):
             session_result=None,
             multiselect=False,
             marker_pl=" ",
+            match_exact=False,
         )
 
     def test_prompt_after_input(self):
@@ -428,6 +434,15 @@ def test_prompt_after_input(self):
         )
         self.assertEqual(prompt._generate_after_input(), [])
 
+    def test_prompt_after_input2(self):
+        prompt = FuzzyPrompt(
+            message="", choices=["1", "2", "3"], match_exact=True, exact_symbol=" *"
+        )
+        self.assertEqual(
+            prompt._generate_after_input(),
+            [("", "  "), ("class:fuzzy_info", "3/3"), ("class:fuzzy_info", " *")],
+        )
+
     def test_prompt_before_input(self):
         prompt = FuzzyPrompt(
             message="Select one of them",
@@ -872,6 +887,7 @@ def test_control_line_render(self) -> None:
             session_result=None,
             multiselect=True,
             marker_pl=" ",
+            match_exact=False,
         )
         # range 0-4
         self.assertEqual(control._last_line, 4)
@@ -895,3 +911,80 @@ def test_control_line_render(self) -> None:
         control._get_formatted_choices()
         self.assertEqual(control._last_line, 6)
         self.assertEqual(control._first_line, 2)
+
+    def test_control_exact_match(self) -> None:
+        content_control = InquirerPyFuzzyControl(
+            choices=["meat", "what", "whaaah", "weather", "haha"],
+            pointer=INQUIRERPY_POINTER_SEQUENCE,
+            marker=INQUIRERPY_POINTER_SEQUENCE,
+            current_text=lambda: "aa",
+            max_lines=80,
+            session_result=None,
+            multiselect=False,
+            marker_pl=" ",
+            match_exact=True,
+        )
+        self.assertEqual(
+            content_control._filtered_choices,
+            [
+                {
+                    "enabled": False,
+                    "index": 0,
+                    "indices": [],
+                    "name": "meat",
+                    "value": "meat",
+                },
+                {
+                    "enabled": False,
+                    "index": 1,
+                    "indices": [],
+                    "name": "what",
+                    "value": "what",
+                },
+                {
+                    "enabled": False,
+                    "index": 2,
+                    "indices": [],
+                    "name": "whaaah",
+                    "value": "whaaah",
+                },
+                {
+                    "enabled": False,
+                    "index": 3,
+                    "indices": [],
+                    "name": "weather",
+                    "value": "weather",
+                },
+                {
+                    "enabled": False,
+                    "index": 4,
+                    "indices": [],
+                    "name": "haha",
+                    "value": "haha",
+                },
+            ],
+        )
+        result = asyncio.run(content_control._filter_choices(0.0))
+        self.assertEqual(
+            result,
+            [
+                {
+                    "enabled": False,
+                    "index": 2,
+                    "indices": [2, 3],
+                    "name": "whaaah",
+                    "value": "whaaah",
+                }
+            ],
+        )
+
+    def test_toggle_exact(self):
+        self.assertEqual(self.prompt.content_control._scorer, fzy_scorer)
+        self.prompt._toggle_exact(None)
+        self.assertEqual(self.prompt.content_control._scorer, substr_scorer)
+        self.prompt._toggle_exact(None)
+        self.assertEqual(self.prompt.content_control._scorer, fzy_scorer)
+        self.prompt._toggle_exact(None, True)
+        self.assertEqual(self.prompt.content_control._scorer, substr_scorer)
+        self.prompt._toggle_exact(None, False)
+        self.assertEqual(self.prompt.content_control._scorer, fzy_scorer)