feat(parser): add docstrings, centralized suggestion errors, and improved flag handling

-Added descriptive docstrings across `Falyx` and `CommandArgumentParser` internals:
  - `is_cli_mode`, `get_tip`, and `_render_help` in `falyx.py`
  - Validation and parsing helpers in `command_argument_parser.py` (`_validate_nargs`, `_normalize_choices`, `_validate_default_list_type`, `_validate_action`, `_register_store_bool_optional`, `_register_argument`, `_check_if_in_choices`, `_raise_remaining_args_error`, `_consume_nargs`, `_consume_all_positional_args`, `_handle_token`, `_find_last_flag_argument`, `_is_mid_value`, `_is_invalid_choices_state`, `_value_suggestions_for_arg`)
- Introduced `_raise_suggestion_error()` utility to standardize error messages when required values are missing, including defaults and choices.
  - Replaced duplicated inline suggestion/error logic in `APPEND`, `EXTEND`, and generic STORE handlers with this helper.
- Improved error chaining with `from error` for clarity in `_normalize_choices` and `_validate_action`.
- Consolidated `HELP`, `TLDR`, and `COUNT` default-value validation into a single check.
- Enhanced completions:
  - Extended suggestion logic to show remaining flags for `APPEND`, `EXTEND`, and `COUNT` arguments when last tokens are not keywords.
- Added `.config.json` to `.gitignore`.
- Bumped version to 0.1.85.

.gitignore

@@ -15,3 +15,4 @@ build/
 .vscode/
 coverage.xml
 .coverage
+.config.json

examples/argument_examples.py

@@ -1,5 +1,6 @@
 import asyncio
 from enum import Enum
+from pathlib import Path
 
 from falyx import Falyx
 from falyx.action import Action
@@ -21,13 +22,27 @@ async def test_args(
     service: str,
     place: Place = Place.NEW_YORK,
     region: str = "us-east-1",
+    path: Path | None = None,
     tag: str | None = None,
     verbose: bool | None = None,
-    number: int | None = None,
+    numbers: list[int] | None = None,
+    just_a_bool: bool = False,
 ) -> str:
+    if numbers is None:
+        numbers = []
     if verbose:
-        print(f"Deploying {service}:{tag}:{number} to {region} at {place}...")
+        print(
-    return f"{service}:{tag}:{number} deployed to {region} at {place}"
+            f"Deploying {service}:{tag}:{"|".join(str(number) for number in numbers)} to {region} at {place} from {path}..."
+        )
+    return f"{service}:{tag}:{"|".join(str(number) for number in numbers)} deployed to {region} at {place} from {path}."
+
+
+async def test_path_arg(*paths: Path) -> str:
+    return f"Path argument received: {'|'.join(str(path) for path in paths)}"
+
+
+async def test_positional_numbers(*numbers: int) -> str:
+    return f"Positional numbers received: {', '.join(str(num) for num in numbers)}"
 
 
 def default_config(parser: CommandArgumentParser) -> None:
@@ -52,22 +67,37 @@ def default_config(parser: CommandArgumentParser) -> None:
         help="Deployment region.",
         choices=["us-east-1", "us-west-2", "eu-west-1"],
     )
+    parser.add_argument(
+        "-p",
+        "--path",
+        type=Path,
+        help="Path to the configuration file.",
+    )
     parser.add_argument(
         "--verbose",
         action="store_bool_optional",
         help="Enable verbose output.",
     )
     parser.add_argument(
+        "-t",
         "--tag",
         type=str,
         help="Optional tag for the deployment.",
         suggestions=["latest", "stable", "beta"],
     )
     parser.add_argument(
-        "--number",
+        "--numbers",
         type=int,
+        nargs="*",
+        default=[1, 2, 3],
         help="Optional number argument.",
     )
+    parser.add_argument(
+        "-j",
+        "--just-a-bool",
+        action="store_true",
+        help="Just a boolean flag.",
+    )
     parser.add_tldr_examples(
         [
             ("web", "Deploy 'web' to the default location (New York)"),
@@ -77,6 +107,40 @@ def default_config(parser: CommandArgumentParser) -> None:
     )
 
 
+def path_config(parser: CommandArgumentParser) -> None:
+    """Argument configuration for path testing command."""
+    parser.add_argument(
+        "paths",
+        type=Path,
+        nargs="*",
+        help="One or more file or directory paths.",
+    )
+    parser.add_tldr_examples(
+        [
+            ("/path/to/file.txt", "Single file path"),
+            ("/path/to/dir1 /path/to/dir2", "Multiple directory paths"),
+            ("/path/with spaces/file.txt", "Path with spaces"),
+        ]
+    )
+
+
+def numbers_config(parser: CommandArgumentParser) -> None:
+    """Argument configuration for positional numbers testing command."""
+    parser.add_argument(
+        "numbers",
+        type=int,
+        nargs="*",
+        help="One or more integers.",
+    )
+    parser.add_tldr_examples(
+        [
+            ("1 2 3", "Three numbers"),
+            ("42", "Single number"),
+            ("", "No numbers"),
+        ]
+    )
+
+
 flx = Falyx(
     "Argument Examples",
     program="argument_examples.py",
@@ -98,4 +162,30 @@ flx.add_command(
     argument_config=default_config,
 )
 
+flx.add_command(
+    key="P",
+    aliases=["path"],
+    description="Path Command",
+    help_text="A command to test path argument parsing.",
+    action=Action(
+        name="test_path_arg",
+        action=test_path_arg,
+    ),
+    style="bold #F2B3EB",
+    argument_config=path_config,
+)
+
+flx.add_command(
+    key="N",
+    aliases=["numbers"],
+    description="Numbers Command",
+    help_text="A command to test positional numbers argument parsing.",
+    action=Action(
+        name="test_positional_numbers",
+        action=test_positional_numbers,
+    ),
+    style="bold #F2F2B3",
+    argument_config=numbers_config,
+)
+
 asyncio.run(flx.run())

falyx/bottom_bar.py

@@ -21,12 +21,14 @@ Key Features:
 - Columnar layout with automatic width scaling
 - Optional integration with `OptionsManager` for dynamic state toggling
 
-Usage Example:
+Example:
+    ```
     bar = BottomBar(columns=3)
     bar.add_static("env", "ENV: dev")
     bar.add_toggle("d", "Debug", get_debug, toggle_debug)
     bar.add_value_tracker("attempts", "Retries", get_retry_count)
     bar.render()
+    ```
 
 Used by Falyx to provide a persistent UI element showing toggles, system state,
 and runtime telemetry below the input prompt.

falyx/command.py

@@ -346,6 +346,7 @@ class Command(BaseModel):
             FalyxMode.RUN,
             FalyxMode.PREVIEW,
             FalyxMode.RUN_ALL,
+            FalyxMode.HELP,
         }
 
         program = f"{self.program} run " if is_cli_mode else ""
@@ -365,7 +366,7 @@ class Command(BaseModel):
         )
         return (
             f"[{self.style}]{program}[/]{command_keys}",
-            f"[dim]{self.description}[/dim]",
+            f"[dim]{self.help_text or self.description}[/dim]",
             "",
         )
 

falyx/completer.py

@@ -8,15 +8,20 @@ This completer supports:
 - Argument flag completion for registered commands (e.g. `--tag`, `--name`)
 - Context-aware suggestions based on cursor position and argument structure
 - Interactive value completions (e.g. choices and suggestions defined per argument)
+- File/path-friendly behavior, quoting completions with spaces automatically
+
+
+Completions are generated from:
+- Registered commands in `Falyx`
+- Argument metadata and `suggest_next()` from `CommandArgumentParser`
 
-Completions are sourced from `CommandArgumentParser.suggest_next`, which analyzes
-parsed tokens to determine appropriate next arguments, flags, or values.
 
 Integrated with the `Falyx.prompt_session` to enhance the interactive experience.
 """
 
 from __future__ import annotations
 
+import os
 import shlex
 from typing import TYPE_CHECKING, Iterable
 
@@ -41,9 +46,12 @@ class FalyxCompleter(Completer):
         - Remaining required or optional flags
         - Flag value suggestions (choices or custom completions)
         - Next positional argument hints
+        - Inserts longest common prefix (LCP) completions when applicable
+        - Handles special cases like quoted strings and spaces
+        - Supports dynamic argument suggestions (e.g. flags, file paths, etc.)
 
     Args:
-        falyx (Falyx): The Falyx menu instance containing all command mappings and parsers.
+        falyx (Falyx): The active Falyx instance providing command and parser context.
     """
 
     def __init__(self, falyx: "Falyx"):
@@ -51,14 +59,21 @@ class FalyxCompleter(Completer):
 
     def get_completions(self, document: Document, complete_event) -> Iterable[Completion]:
         """
-        Yield completions based on the current document input.
+        Compute completions for the current user input.
+
+        Analyzes the input buffer, determines whether the user is typing:
+        • A command key/alias
+        • A flag/option
+        • An argument value
+
+        and yields appropriate completions.
 
         Args:
-            document (Document): The prompt_toolkit document containing the input buffer.
+            document (Document): The current Prompt Toolkit document (input buffer & cursor).
-            complete_event: The completion trigger event (unused).
+            complete_event: The triggering event (TAB key, menu display, etc.) — not used here.
 
         Yields:
-            Completion objects matching command keys or argument suggestions.
+            Completion: One or more completions matching the current stub text.
         """
         text = document.text_before_cursor
         try:
@@ -69,7 +84,9 @@ class FalyxCompleter(Completer):
 
         if not tokens or (len(tokens) == 1 and not cursor_at_end_of_token):
             # Suggest command keys and aliases
-            yield from self._suggest_commands(tokens[0] if tokens else "")
+            stub = tokens[0] if tokens else ""
+            suggestions = [c.text for c in self._suggest_commands(stub)]
+            yield from self._yield_lcp_completions(suggestions, stub)
             return
 
         # Identify command
@@ -83,21 +100,10 @@ class FalyxCompleter(Completer):
         stub = "" if cursor_at_end_of_token else tokens[-1]
 
         try:
-            if not command.arg_parser:
-                return
             suggestions = command.arg_parser.suggest_next(
                 parsed_args + ([stub] if stub else []), cursor_at_end_of_token
             )
-            for suggestion in suggestions:
+            yield from self._yield_lcp_completions(suggestions, stub)
-                if suggestion.startswith(stub):
-                    if len(suggestion.split()) > 1:
-                        yield Completion(
-                            f'"{suggestion}"',
-                            start_position=-len(stub),
-                            display=suggestion,
-                        )
-                    else:
-                        yield Completion(suggestion, start_position=-len(stub))
         except Exception:
             return
 
@@ -105,13 +111,15 @@ class FalyxCompleter(Completer):
         """
         Suggest top-level command keys and aliases based on the given prefix.
 
+        Filters all known commands (and `exit`, `help`, `history` built-ins)
+        to only those starting with the given prefix.
+
         Args:
-            prefix (str): The user input to match against available commands.
+            prefix (str): The current typed prefix.
 
         Yields:
             Completion: Matching keys or aliases from all registered commands.
         """
-        prefix = prefix.upper()
         keys = [self.falyx.exit_command.key]
         keys.extend(self.falyx.exit_command.aliases)
         if self.falyx.history_command:
@@ -125,4 +133,64 @@ class FalyxCompleter(Completer):
             keys.extend(cmd.aliases)
         for key in keys:
             if key.upper().startswith(prefix):
-                yield Completion(key, start_position=-len(prefix))
+                yield Completion(key.upper(), start_position=-len(prefix))
+            elif key.lower().startswith(prefix):
+                yield Completion(key.lower(), start_position=-len(prefix))
+
+    def _ensure_quote(self, text: str) -> str:
+        """
+        Ensure that a suggestion is shell-safe by quoting if needed.
+
+        Adds quotes around completions containing whitespace so they can
+        be inserted into the CLI without breaking tokenization.
+
+        Args:
+            text (str): The input text to quote.
+
+        Returns:
+            str: The quoted text, suitable for shell command usage.
+        """
+        if " " in text or "\t" in text:
+            return f'"{text}"'
+        return text
+
+    def _yield_lcp_completions(self, suggestions, stub):
+        """
+        Yield completions for the current stub using longest-common-prefix logic.
+
+        Behavior:
+        - If only one match → yield it fully.
+        - If multiple matches share a longer prefix → insert the prefix, but also
+            display all matches in the menu.
+        - If no shared prefix → list all matches individually.
+
+        Args:
+            suggestions (list[str]): The raw suggestions to consider.
+            stub (str): The currently typed prefix (used to offset insertion).
+
+        Yields:
+            Completion: Completion objects for the Prompt Toolkit menu.
+        """
+        matches = [s for s in suggestions if s.startswith(stub)]
+        if not matches:
+            return
+
+        lcp = os.path.commonprefix(matches)
+
+        if len(matches) == 1:
+            yield Completion(
+                self._ensure_quote(matches[0]),
+                start_position=-len(stub),
+                display=matches[0],
+            )
+        elif len(lcp) > len(stub) and not lcp.startswith("-"):
+            yield Completion(lcp, start_position=-len(stub), display=lcp)
+            for match in matches:
+                yield Completion(
+                    self._ensure_quote(match), start_position=-len(stub), display=match
+                )
+        else:
+            for match in matches:
+                yield Completion(
+                    self._ensure_quote(match), start_position=-len(stub), display=match
+                )

falyx/falyx.py

@@ -37,6 +37,7 @@ from prompt_toolkit.formatted_text import StyleAndTextTuples
 from prompt_toolkit.history import FileHistory
 from prompt_toolkit.key_binding import KeyBindings
 from prompt_toolkit.patch_stdout import patch_stdout
+from prompt_toolkit.shortcuts import CompleteStyle
 from prompt_toolkit.validation import ValidationError
 from rich import box
 from rich.console import Console
@@ -202,10 +203,12 @@ class Falyx:
 
     @property
     def is_cli_mode(self) -> bool:
+        """Checks if the current mode is a CLI mode."""
         return self.options.get("mode") in {
             FalyxMode.RUN,
             FalyxMode.PREVIEW,
             FalyxMode.RUN_ALL,
+            FalyxMode.HELP,
         }
 
     def validate_options(
@@ -279,7 +282,7 @@ class Falyx:
 
     def _get_exit_command(self) -> Command:
         """Returns the back command for the menu."""
-        return Command(
+        exit_command = Command(
             key="X",
             description="Exit",
             action=Action("Exit", action=_noop),
@@ -289,7 +292,11 @@ class Falyx:
             ignore_in_history=True,
             options_manager=self.options,
             program=self.program,
+            help_text="Exit the program.",
         )
+        if exit_command.arg_parser:
+            exit_command.arg_parser.add_tldr_examples([("", "Exit the program.")])
+        return exit_command
 
     def _get_history_command(self) -> Command:
         """Returns the history command for the menu."""
@@ -299,6 +306,7 @@ class Falyx:
             command_style=OneColors.DARK_YELLOW,
             aliases=["HISTORY"],
             program=self.program,
+            options_manager=self.options,
         )
         parser.add_argument(
             "-n",
@@ -333,6 +341,19 @@ class Falyx:
         parser.add_argument(
             "-l", "--last-result", action="store_true", help="Get the last result"
         )
+        parser.add_tldr_examples(
+            [
+                ("", "Show the full execution history."),
+                ("-n build", "Show history entries for the 'build' command."),
+                ("-s success", "Show only successful executions."),
+                ("-s error", "Show only failed executions."),
+                ("-i 3", "Show the history entry at index 3."),
+                ("-r 0", "Show the result or traceback for entry index 0."),
+                ("-l", "Show the last execution result."),
+                ("-c", "Clear the execution history."),
+            ]
+        )
+
         return Command(
             key="Y",
             description="History",
@@ -347,6 +368,7 @@ class Falyx:
         )
 
     def get_tip(self) -> str:
+        """Returns a random tip for the user about using Falyx."""
         program = f"{self.program} run " if self.is_cli_mode else ""
         tips = [
             f"Use '{program}?[COMMAND]' to preview a command.",
@@ -358,11 +380,12 @@ class Falyx:
             f"Use '{self.program} --verbose' to enable debug logging for a menu session.",
             f"'{self.program} --debug-hooks' will trace every before/after hook in action.",
             f"Run commands directly from the CLI: '{self.program} run [COMMAND] [OPTIONS]'.",
+            "All [COMMAND] keys and aliases are case-insensitive.",
         ]
         if self.is_cli_mode:
             tips.extend(
                 [
-                    f"Use '{self.program} run ?' to list all commands at any time.",
+                    f"Use '{self.program} help' to list all commands at any time.",
                     f"Use '{self.program} --never-prompt run [COMMAND] [OPTIONS]' to disable all prompts for [bold italic]just this command[/].",
                     f"Use '{self.program} run --skip-confirm [COMMAND] [OPTIONS]' to skip confirmations.",
                     f"Use '{self.program} run --summary [COMMAND] [OPTIONS]' to print a post-run summary.",
@@ -381,7 +404,35 @@ class Falyx:
             )
         return choice(tips)
 
-    async def _render_help(self, tag: str = "") -> None:
+    async def _render_help(
+        self, tag: str = "", key: str | None = None, tldr: bool = False
+    ) -> None:
+        """Renders the help menu with command details, usage examples, and tips."""
+        if tldr and not key:
+            if self.help_command and self.help_command.arg_parser:
+                self.help_command.arg_parser.render_tldr()
+                self.console.print(f"[bold]tip:[/bold] {self.get_tip()}")
+                return None
+        if key:
+            _, command, args, kwargs = await self.get_command(key, from_help=True)
+            if command and tldr and command.arg_parser:
+                command.arg_parser.render_tldr()
+                self.console.print(f"[bold]tip:[/bold] {self.get_tip()}")
+                return None
+            elif command and tldr and not command.arg_parser:
+                self.console.print(
+                    f"[bold]No TLDR examples available for '{command.description}'.[/bold]"
+                )
+            elif command and command.arg_parser:
+                command.arg_parser.render_help()
+                self.console.print(f"[bold]tip:[/bold] {self.get_tip()}")
+                return None
+            elif command and not command.arg_parser:
+                self.console.print(
+                    f"[bold]No detailed help available for '{command.description}'.[/bold]"
+                )
+            else:
+                self.console.print(f"[bold]No command found for '{key}'.[/bold]")
         if tag:
             tag_lower = tag.lower()
             self.console.print(f"[bold]{tag_lower}:[/bold]")
@@ -392,13 +443,17 @@ class Falyx:
             ]
             if not commands:
                 self.console.print(f"'{tag}'... Nothing to show here")
-                return
+                return None
             for command in commands:
                 usage, description, _ = command.help_signature
-                self.console.print(usage)
+                self.console.print(
-                if description:
+                    Padding(
-                    self.console.print(description)
+                        Panel(usage, expand=False, title=description, title_align="left"),
-            return
+                        (0, 2),
+                    )
+                )
+            self.console.print(f"[bold]tip:[/bold] {self.get_tip()}")
+            return None
 
         self.console.print("[bold]help:[/bold]")
         for command in self.commands.values():
@@ -447,8 +502,10 @@ class Falyx:
             command_key="H",
             command_description="Help",
             command_style=OneColors.LIGHT_YELLOW,
-            aliases=["?", "HELP", "LIST"],
+            aliases=["HELP", "?"],
             program=self.program,
+            options_manager=self.options,
+            _is_help_command=True,
         )
         parser.add_argument(
             "-t",
@@ -457,11 +514,27 @@ class Falyx:
             default="",
             help="Optional tag to filter commands by.",
         )
+        parser.add_argument(
+            "-k",
+            "--key",
+            nargs="?",
+            default=None,
+            help="Optional command key or alias to get detailed help for.",
+        )
+        parser.add_tldr_examples(
+            [
+                ("", "Show all commands."),
+                ("-k [COMMAND]", "Show detailed help for a specific command."),
+                ("-Tk [COMMAND]", "Show quick usage examples for a specific command."),
+                ("-T", "Show these quick usage examples."),
+                ("-t [TAG]", "Show commands with the specified tag."),
+            ]
+        )
         return Command(
             key="H",
-            aliases=["?", "HELP", "LIST"],
+            aliases=["HELP", "?"],
             description="Help",
-            help_text="Show this help menu",
+            help_text="Show this help menu.",
             action=Action("Help", self._render_help),
             style=OneColors.LIGHT_YELLOW,
             arg_parser=parser,
@@ -559,6 +632,7 @@ class Falyx:
                 history=self.history,
                 multiline=False,
                 completer=self._get_completer(),
+                complete_style=CompleteStyle.COLUMN,
                 validator=CommandValidator(self, self._get_validator_error_message()),
                 bottom_toolbar=self._get_bottom_bar_render(),
                 key_bindings=self.key_bindings,
@@ -625,6 +699,7 @@ class Falyx:
         style: str = OneColors.DARK_RED,
         confirm: bool = False,
         confirm_message: str = "Are you sure?",
+        help_text: str = "Exit the program.",
     ) -> None:
         """Updates the back command of the menu."""
         self._validate_command_key(key)
@@ -642,7 +717,10 @@ class Falyx:
             ignore_in_history=True,
             options_manager=self.options,
             program=self.program,
+            help_text=help_text,
         )
+        if self.exit_command.arg_parser:
+            self.exit_command.arg_parser.add_tldr_examples([("", help_text)])
 
     def add_submenu(
         self, key: str, description: str, submenu: Falyx, *, style: str = OneColors.CYAN
@@ -655,7 +733,12 @@ class Falyx:
             key, description, submenu.menu, style=style, simple_help_signature=True
         )
         if submenu.exit_command.key == "X":
-            submenu.update_exit_command(key="B", description="Back", aliases=["BACK"])
+            submenu.update_exit_command(
+                key="B",
+                description="Back",
+                aliases=["BACK"],
+                help_text="Go back to the previous menu.",
+            )
 
     def add_commands(self, commands: list[Command] | list[dict]) -> None:
         """Adds a list of Command instances or config dicts."""
@@ -861,7 +944,7 @@ class Falyx:
         return False, input_str.strip()
 
     async def get_command(
-        self, raw_choices: str, from_validate=False
+        self, raw_choices: str, from_validate=False, from_help=False
     ) -> tuple[bool, Command | None, tuple, dict[str, Any]]:
         """
         Returns the selected command based on user input.
@@ -902,11 +985,7 @@ class Falyx:
                 logger.info("Command '%s' selected.", run_command.key)
             if is_preview:
                 return True, run_command, args, kwargs
-            elif self.options.get("mode") in {
+            elif self.is_cli_mode or from_help:
-                FalyxMode.RUN,
-                FalyxMode.RUN_ALL,
-                FalyxMode.PREVIEW,
-            }:
                 return False, run_command, args, kwargs
             try:
                 args, kwargs = await run_command.parse_args(input_args, from_validate)
@@ -1155,7 +1234,59 @@ class Falyx:
         subparsers: _SubParsersAction | None = None,
         callback: Callable[..., Any] | None = None,
     ) -> None:
-        """Run Falyx CLI with structured subcommands."""
+        """
+        Entrypoint for executing a Falyx CLI application via structured subcommands.
+
+        This method parses CLI arguments, configures the runtime environment, and dispatches
+        execution to the appropriate command mode:
+
+        - help - Show help output, optionally filtered by tag.
+        - version - Print the program version and exit.
+        - preview - Display a preview of the specified command without executing it.
+        - run - Execute a single command with parsed arguments and lifecycle hooks.
+        - run-all - Run all commands matching a tag concurrently (with default args).
+        - (default) - Launch the interactive Falyx menu loop.
+
+        It also applies CLI flags such as `--verbose`, `--debug-hooks`, and summary reporting,
+        and supports an optional callback for post-parse setup.
+
+        Args:
+            falyx_parsers (FalyxParsers | None):
+                Preconfigured argument parser set. If not provided, a default parser
+                is created using the registered commands and passed-in `root_parser`
+                or `subparsers`.
+            root_parser (ArgumentParser | None):
+                Optional root parser to merge into the CLI (used if `falyx_parsers`
+                is not supplied).
+            subparsers (_SubParsersAction | None):
+                Optional subparser group to extend (used if `falyx_parsers` is not supplied).
+            callback (Callable[..., Any] | None):
+                An optional function or coroutine to run after parsing CLI arguments,
+                typically for initializing logging, environment setup, or other
+                pre-execution configuration.
+
+        Raises:
+            FalyxError:
+                If invalid parser objects are supplied, or CLI arguments conflict
+                with the expected run mode.
+            SystemExit:
+                Exits with an appropriate exit code based on the selected command
+                or signal (e.g. Ctrl+C triggers exit code 130).
+
+        Notes:
+            - `run-all` executes all tagged commands **in parallel** and does not
+            supply arguments to individual commands; use `ChainedAction` or explicit
+            CLI calls for ordered or parameterized workflows.
+            - Most CLI commands exit the process via `sys.exit()` after completion.
+            - For interactive sessions, this method falls back to `menu()`.
+
+        Example:
+            ```
+            >>> flx = Falyx()
+            >>> await flx.run()   # Parses CLI args and dispatches appropriately
+            ```
+        """
+
         if self.cli_args:
             raise FalyxError(
                 "Run is incompatible with CLI arguments. Use 'run_key' instead."
@@ -1198,8 +1329,11 @@ class Falyx:
             logger.debug("Enabling global debug hooks for all commands")
             self.register_all_with_debug_hooks()
 
-        if self.cli_args.command == "list":
+        if self.cli_args.command == "help":
-            await self._render_help(tag=self.cli_args.tag)
+            self.options.set("mode", FalyxMode.HELP)
+            await self._render_help(
+                tag=self.cli_args.tag, key=self.cli_args.key, tldr=self.cli_args.tldr
+            )
             sys.exit(0)
 
         if self.cli_args.command == "version" or self.cli_args.version:
@@ -1247,13 +1381,13 @@ class Falyx:
                 sys.exit(1)
             except QuitSignal:
                 logger.info("[QuitSignal]. <- Exiting run.")
-                sys.exit(0)
+                sys.exit(130)
             except BackSignal:
                 logger.info("[BackSignal]. <- Exiting run.")
-                sys.exit(0)
+                sys.exit(1)
             except CancelSignal:
                 logger.info("[CancelSignal]. <- Exiting run.")
-                sys.exit(0)
+                sys.exit(1)
 
             if self.cli_args.summary:
                 er.summary()
@@ -1278,22 +1412,35 @@ class Falyx:
                 f"{self.cli_args.tag}"
             )
 
+            tasks = []
+            try:
                 for cmd in matching:
                     self._set_retry_policy(cmd)
-                try:
+                    tasks.append(self.run_key(cmd.key))
-                    await self.run_key(cmd.key)
+            except Exception as error:
-                except FalyxError as error:
+                self.console.print(
-                    self.console.print(f"[{OneColors.DARK_RED}]❌ Error: {error}[/]")
+                    f"[{OneColors.DARK_RED}]❌ Unexpected error: {error}[/]"
+                )
                 sys.exit(1)
-                except QuitSignal:
+
+            had_errors = False
+            results = await asyncio.gather(*tasks, return_exceptions=True)
+            for result in results:
+                if isinstance(result, QuitSignal):
                     logger.info("[QuitSignal]. <- Exiting run.")
-                    sys.exit(0)
+                    sys.exit(130)
-                except BackSignal:
+                elif isinstance(result, CancelSignal):
-                    logger.info("[BackSignal]. <- Exiting run.")
+                    logger.info("[CancelSignal]. <- Execution cancelled.")
-                    sys.exit(0)
+                    sys.exit(1)
-                except CancelSignal:
+                elif isinstance(result, BackSignal):
-                    logger.info("[CancelSignal]. <- Exiting run.")
+                    logger.info("[BackSignal]. <- Back signal received.")
-                    sys.exit(0)
+                    sys.exit(1)
+                elif isinstance(result, FalyxError):
+                    self.console.print(f"[{OneColors.DARK_RED}]❌ Error: {result}[/]")
+                    had_errors = True
+
+            if had_errors:
+                sys.exit(1)
 
             if self.cli_args.summary:
                 er.summary()

falyx/mode.py

@@ -10,3 +10,4 @@ class FalyxMode(Enum):
     RUN = "run"
     PREVIEW = "preview"
     RUN_ALL = "run-all"
+    HELP = "help"

falyx/parser/parser_types.py

@@ -28,6 +28,18 @@ class ArgumentState:
 
     arg: Argument
     consumed: bool = False
+    consumed_position: int | None = None
+    has_invalid_choice: bool = False
+
+    def set_consumed(self, position: int | None = None) -> None:
+        """Mark this argument as consumed, optionally setting the position."""
+        self.consumed = True
+        self.consumed_position = position
+
+    def reset(self) -> None:
+        """Reset the consumed state."""
+        self.consumed = False
+        self.consumed_position = None
 
 
 @dataclass(frozen=True)

falyx/parser/parsers.py

@@ -4,7 +4,7 @@ Provides the argument parser infrastructure for the Falyx CLI.
 
 This module defines the `FalyxParsers` dataclass and related utilities for building
 structured CLI interfaces with argparse. It supports top-level CLI commands like
-`run`, `run-all`, `preview`, `list`, and `version`, and integrates seamlessly with
+`run`, `run-all`, `preview`, `help`, and `version`, and integrates seamlessly with
 registered `Command` objects for dynamic help, usage generation, and argument handling.
 
 Key Components:
@@ -39,7 +39,7 @@ class FalyxParsers:
     run: ArgumentParser
     run_all: ArgumentParser
     preview: ArgumentParser
-    list: ArgumentParser
+    help: ArgumentParser
     version: ArgumentParser
 
     def parse_args(self, args: Sequence[str] | None = None) -> Namespace:
@@ -59,7 +59,7 @@ def get_root_parser(
     prog: str | None = "falyx",
     usage: str | None = None,
     description: str | None = "Falyx CLI - Run structured async command workflows.",
-    epilog: str | None = "Tip: Use 'falyx run ?' to show available commands.",
+    epilog: str | None = "Tip: Use 'falyx help' to show available commands.",
     parents: Sequence[ArgumentParser] | None = None,
     prefix_chars: str = "-",
     fromfile_prefix_chars: str | None = None,
@@ -178,7 +178,7 @@ def get_arg_parsers(
     description: str | None = "Falyx CLI - Run structured async command workflows.",
     epilog: (
         str | None
-    ) = "Tip: Use 'falyx run ?[COMMAND]' to preview any command from the CLI.",
+    ) = "Tip: Use 'falyx preview [COMMAND]' to preview any command from the CLI.",
     parents: Sequence[ArgumentParser] | None = None,
     prefix_chars: str = "-",
     fromfile_prefix_chars: str | None = None,
@@ -196,7 +196,7 @@ def get_arg_parsers(
 
     This function builds the root parser and all subcommand parsers used for structured
     CLI workflows in Falyx. It supports standard subcommands including `run`, `run-all`,
-    `preview`, `list`, and `version`, and integrates with registered `Command` objects
+    `preview`, `help`, and `version`, and integrates with registered `Command` objects
     to populate dynamic help and usage documentation.
 
     Args:
@@ -219,7 +219,7 @@ def get_arg_parsers(
 
     Returns:
         FalyxParsers: A structured container of all parsers, including `run`, `run-all`,
-                      `preview`, `list`, `version`, and the root parser.
+                      `preview`, `help`, `version`, and the root parser.
 
     Raises:
         TypeError: If `root_parser` is not an instance of ArgumentParser or
@@ -240,7 +240,7 @@ def get_arg_parsers(
         - Use `falyx run ?[COMMAND]` from the CLI to preview a command.
     """
     if epilog is None:
-        epilog = f"Tip: Use '{prog} run ?' to show available commands."
+        epilog = f"Tip: Use '{prog} help' to show available commands."
     if root_parser is None:
         parser = get_root_parser(
             prog=prog,
@@ -281,7 +281,7 @@ def get_arg_parsers(
             command_description = command.help_text or command.description
             run_description.append(f"{' '*24}{command_description}")
     run_epilog = (
-        f"Tip: Use '{prog} run ?[COMMAND]' to preview commands by their key or alias."
+        f"Tip: Use '{prog} preview [COMMAND]' to preview commands by their key or alias."
     )
     run_parser = subparsers.add_parser(
         "run",
@@ -375,11 +375,23 @@ def get_arg_parsers(
     )
     preview_parser.add_argument("name", help="Key, alias, or description of the command")
 
-    list_parser = subparsers.add_parser(
+    help_parser = subparsers.add_parser("help", help="List all available commands")
-        "list", help="List all available commands with tags"
+
+    help_parser.add_argument(
+        "-k",
+        "--key",
+        help="Show help for a specific command by its key or alias",
+        default=None,
     )
 
-    list_parser.add_argument(
+    help_parser.add_argument(
+        "-T",
+        "--tldr",
+        action="store_true",
+        help="Show a simplified TLDR examples of a command if available",
+    )
+
+    help_parser.add_argument(
         "-t", "--tag", help="Filter commands by tag (case-insensitive)", default=None
     )
 
@@ -391,6 +403,6 @@ def get_arg_parsers(
         run=run_parser,
         run_all=run_all_parser,
         preview=preview_parser,
-        list=list_parser,
+        help=help_parser,
         version=version_parser,
     )

falyx/parser/signature.py

@@ -26,6 +26,18 @@ def infer_args_from_func(
     This utility inspects the parameters of a function and returns a list of dictionaries,
     each of which can be passed to `CommandArgumentParser.add_argument()`.
 
+    It supports:
+    - Positional and keyword arguments
+    - Type hints for argument types
+    - Default values
+    - Required vs optional arguments
+    - Custom help text, choices, and suggestions via metadata
+
+    Note:
+        - Only parameters with kind `POSITIONAL_ONLY`, `POSITIONAL_OR_KEYWORD`, or
+          `KEYWORD_ONLY` are considered.
+        - Parameters with kind `VAR_POSITIONAL` or `VAR_KEYWORD` are ignored.
+
     Args:
         func (Callable | None): The function to inspect.
         arg_metadata (dict | None): Optional metadata overrides for help text, type hints,

falyx/validators.py

@@ -118,6 +118,10 @@ def words_validator(
 
 def word_validator(word: str) -> Validator:
     """Validator for specific word inputs."""
+    if word.upper() == "N":
+        raise ValueError(
+            "The word 'N' is reserved for yes/no validation. Use yes_no_validator instead."
+        )
 
     def validate(text: str) -> bool:
         if text.upper().strip() == "N":

falyx/version.py

@@ -1 +1 @@
-__version__ = "0.1.78"
+__version__ = "0.1.85"

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "falyx"
-version = "0.1.78"
+version = "0.1.85"
 description = "Reliable and introspectable async CLI action framework."
 authors = ["Roland Thomas Jr <roland@rtj.dev>"]
 license = "MIT"

tests/test_completer/test_completer.py

@@ -0,0 +1,97 @@
+from types import SimpleNamespace
+
+import pytest
+from prompt_toolkit.completion import Completion
+from prompt_toolkit.document import Document
+
+from falyx.completer import FalyxCompleter
+
+
+@pytest.fixture
+def fake_falyx():
+    fake_arg_parser = SimpleNamespace(
+        suggest_next=lambda tokens, end: ["--tag", "--name", "value with space"]
+    )
+    fake_command = SimpleNamespace(key="R", aliases=["RUN"], arg_parser=fake_arg_parser)
+    return SimpleNamespace(
+        exit_command=SimpleNamespace(key="X", aliases=["EXIT"]),
+        help_command=SimpleNamespace(key="H", aliases=["HELP"]),
+        history_command=SimpleNamespace(key="Y", aliases=["HISTORY"]),
+        commands={"R": fake_command},
+        _name_map={"R": fake_command, "RUN": fake_command, "X": fake_command},
+    )
+
+
+def test_suggest_commands(fake_falyx):
+    completer = FalyxCompleter(fake_falyx)
+    completions = list(completer._suggest_commands("R"))
+    assert any(c.text == "R" for c in completions)
+    assert any(c.text == "RUN" for c in completions)
+
+
+def test_suggest_commands_empty(fake_falyx):
+    completer = FalyxCompleter(fake_falyx)
+    completions = list(completer._suggest_commands(""))
+    assert any(c.text == "X" for c in completions)
+    assert any(c.text == "H" for c in completions)
+
+
+def test_suggest_commands_no_match(fake_falyx):
+    completer = FalyxCompleter(fake_falyx)
+    completions = list(completer._suggest_commands("Z"))
+    assert not completions
+
+
+def test_get_completions_no_input(fake_falyx):
+    completer = FalyxCompleter(fake_falyx)
+    doc = Document("")
+    results = list(completer.get_completions(doc, None))
+    assert any(isinstance(c, Completion) for c in results)
+    assert any(c.text == "X" for c in results)
+
+
+def test_get_completions_no_match(fake_falyx):
+    completer = FalyxCompleter(fake_falyx)
+    doc = Document("Z")
+    completions = list(completer.get_completions(doc, None))
+    assert not completions
+    doc = Document("Z Z")
+    completions = list(completer.get_completions(doc, None))
+    assert not completions
+
+
+def test_get_completions_partial_command(fake_falyx):
+    completer = FalyxCompleter(fake_falyx)
+    doc = Document("R")
+    results = list(completer.get_completions(doc, None))
+    assert any(c.text in ("R", "RUN") for c in results)
+
+
+def test_get_completions_with_flag(fake_falyx):
+    completer = FalyxCompleter(fake_falyx)
+    doc = Document("R ")
+    results = list(completer.get_completions(doc, None))
+    assert "--tag" in [c.text for c in results]
+
+
+def test_get_completions_partial_flag(fake_falyx):
+    completer = FalyxCompleter(fake_falyx)
+    doc = Document("R --t")
+    results = list(completer.get_completions(doc, None))
+    assert all(c.start_position <= 0 for c in results)
+    assert any(c.text.startswith("--t") or c.display == "--tag" for c in results)
+
+
+def test_get_completions_bad_input(fake_falyx):
+    completer = FalyxCompleter(fake_falyx)
+    doc = Document('R "unclosed quote')
+    results = list(completer.get_completions(doc, None))
+    assert results == []
+
+
+def test_get_completions_exception_handling(fake_falyx):
+    completer = FalyxCompleter(fake_falyx)
+    fake_falyx.commands["R"].arg_parser.suggest_next = lambda *args: 1 / 0
+    doc = Document("R --tag")
+    results = list(completer.get_completions(doc, None))
+    assert results == []

tests/test_completer/test_lcp_completions.py

@@ -0,0 +1,38 @@
+from types import SimpleNamespace
+
+import pytest
+from prompt_toolkit.document import Document
+
+from falyx.completer import FalyxCompleter
+
+
+@pytest.fixture
+def fake_falyx():
+    fake_arg_parser = SimpleNamespace(
+        suggest_next=lambda tokens, end: ["AETHERWARP", "AETHERZOOM"]
+    )
+    fake_command = SimpleNamespace(key="R", aliases=["RUN"], arg_parser=fake_arg_parser)
+    return SimpleNamespace(
+        exit_command=SimpleNamespace(key="X", aliases=["EXIT"]),
+        help_command=SimpleNamespace(key="H", aliases=["HELP"]),
+        history_command=SimpleNamespace(key="Y", aliases=["HISTORY"]),
+        commands={"R": fake_command},
+        _name_map={"R": fake_command, "RUN": fake_command, "X": fake_command},
+    )
+
+
+def test_lcp_completions(fake_falyx):
+    completer = FalyxCompleter(fake_falyx)
+    doc = Document("R A")
+    results = list(completer.get_completions(doc, None))
+    assert any(c.text == "AETHER" for c in results)
+    assert any(c.text == "AETHERWARP" for c in results)
+    assert any(c.text == "AETHERZOOM" for c in results)
+
+
+def test_lcp_completions_space(fake_falyx):
+    completer = FalyxCompleter(fake_falyx)
+    suggestions = ["London", "New York", "San Francisco"]
+    stub = "N"
+    completions = list(completer._yield_lcp_completions(suggestions, stub))
+    assert any(c.text == '"New York"' for c in completions)

tests/test_falyx/test_help.py

@@ -0,0 +1,96 @@
+import pytest
+
+from falyx import Falyx
+
+
+@pytest.mark.asyncio
+async def test_help_command(capsys):
+    flx = Falyx()
+    assert flx.help_command.arg_parser.aliases[0] == "HELP"
+    assert flx.help_command.arg_parser.command_key == "H"
+    await flx.run_key("H")
+
+    captured = capsys.readouterr()
+    assert "Show this help menu" in captured.out
+
+
+@pytest.mark.asyncio
+async def test_help_command_with_new_command(capsys):
+    flx = Falyx()
+
+    async def new_command(falyx: Falyx):
+        pass
+
+    flx.add_command(
+        "N",
+        "New Command",
+        new_command,
+        aliases=["TEST"],
+        help_text="This is a new command.",
+    )
+    await flx.run_key("H")
+
+    captured = capsys.readouterr()
+    assert "This is a new command." in captured.out
+    assert "TEST" in captured.out and "N" in captured.out
+
+
+@pytest.mark.asyncio
+async def test_render_help(capsys):
+    flx = Falyx()
+
+    async def sample_command(falyx: Falyx):
+        pass
+
+    flx.add_command(
+        "S",
+        "Sample Command",
+        sample_command,
+        aliases=["SC"],
+        help_text="This is a sample command.",
+    )
+    await flx._render_help()
+
+    captured = capsys.readouterr()
+    assert "This is a sample command." in captured.out
+    assert "SC" in captured.out and "S" in captured.out
+
+
+@pytest.mark.asyncio
+async def test_help_command_by_tag(capsys):
+    flx = Falyx()
+
+    async def tagged_command(falyx: Falyx):
+        pass
+
+    flx.add_command(
+        "T",
+        "Tagged Command",
+        tagged_command,
+        tags=["tag1"],
+        help_text="This command is tagged.",
+    )
+    await flx.run_key("H", args=("tag1",))
+
+    captured = capsys.readouterr()
+    assert "tag1" in captured.out
+    assert "This command is tagged." in captured.out
+    assert "HELP" not in captured.out
+
+
+@pytest.mark.asyncio
+async def test_help_command_empty_tags(capsys):
+    flx = Falyx()
+
+    async def untagged_command(falyx: Falyx):
+        pass
+
+    flx.add_command(
+        "U", "Untagged Command", untagged_command, help_text="This command has no tags."
+    )
+    await flx.run_key("H", args=("nonexistent_tag",))
+
+    captured = capsys.readouterr()
+    print(captured.out)
+    assert "nonexistent_tag" in captured.out
+    assert "Nothing to show here" in captured.out

tests/test_falyx/test_run.py

@@ -0,0 +1,19 @@
+import sys
+
+import pytest
+
+from falyx import Falyx
+from falyx.parser import get_arg_parsers
+
+
+@pytest.mark.asyncio
+async def test_run_basic(capsys):
+    sys.argv = ["falyx", "run", "-h"]
+    falyx_parsers = get_arg_parsers()
+    assert falyx_parsers is not None, "Falyx parsers should be initialized"
+    flx = Falyx()
+    with pytest.raises(SystemExit):
+        await flx.run(falyx_parsers)
+
+    captured = capsys.readouterr()
+    assert "Run a command by its key or alias." in captured.out

tests/test_parsers/test_completions.py

@@ -1,18 +1,311 @@
+from pathlib import Path
+
 import pytest
 
+from falyx.exceptions import CommandArgumentError
 from falyx.parser.command_argument_parser import CommandArgumentParser
 
 
-@pytest.mark.asyncio
+def build_default_parser():
-@pytest.mark.parametrize(
+    p = CommandArgumentParser(
-    "input_tokens, expected",
+        command_key="D", aliases=["deploy"], program="argument_examples.py"
-    [
-        ([""], ["--help", "--tag", "-h"]),
-        (["--ta"], ["--tag"]),
-        (["--tag"], ["analytics", "build"]),
-    ],
     )
-async def test_suggest_next(input_tokens, expected):
+    p.add_argument("service", type=str, help="Service name.")
-    parser = CommandArgumentParser(...)
+    p.add_argument("place", type=str, nargs="?", default="New York", help="Place.")
-    parser.add_argument("--tag", choices=["analytics", "build"])
+    p.add_argument(
-    assert sorted(parser.suggest_next(input_tokens)) == sorted(expected)
+        "--region",
+        choices=["us-east-1", "us-west-2", "eu-west-1"],
+        help="Region.",
+        default="us-east-1",
+    )
+    p.add_argument("-p", "--path", type=Path, help="Path.")
+    p.add_argument("-v", "--verbose", action="store_true", help="Verbose.")
+    p.add_argument("-t", "--tag", type=str, suggestions=["latest", "stable", "beta"])
+    p.add_argument("--numbers", type=int, nargs="*", default=[1, 2, 3], help="Nums.")
+    p.add_argument("-j", "--just-a-bool", action="store_true", help="Bool.")
+    p.add_argument("-a", action="store_true")
+    p.add_argument("-b", action="store_true")
+    return p
+
+
+@pytest.mark.asyncio
+async def test_parse_minimal_positional_and_defaults():
+    p = build_default_parser()
+    got = await p.parse_args(["web"])
+    assert got["service"] == "web"
+    assert got["place"] == "New York"
+    assert got["numbers"] == [1, 2, 3]
+    assert got["verbose"] is False
+    assert got["tag"] is None
+    assert got["path"] is None
+
+
+@pytest.mark.asyncio
+async def test_parse_all_keywords_and_lists_and_bools():
+    p = build_default_parser()
+    got = await p.parse_args(
+        [
+            "web",
+            "Paris",
+            "--region",
+            "eu-west-1",
+            "--numbers",
+            "10",
+            "20",
+            "-30",
+            "-t",
+            "stable",
+            "-p",
+            "pyproject.toml",
+            "-v",
+            "-j",
+        ]
+    )
+    assert got["service"] == "web"
+    assert got["place"] == "Paris"
+    assert got["region"] == "eu-west-1"
+    assert got["numbers"] == [10, 20, -30]
+    assert got["tag"] == "stable"
+    assert isinstance(got["path"], Path)
+    assert got["verbose"] is True and got["just_a_bool"] is True
+
+
+@pytest.mark.asyncio
+async def test_parse_numbers_negative_values_not_flags():
+    p = build_default_parser()
+    got = await p.parse_args(["web", "--numbers", "-1", "-2", "-3"])
+    assert got["numbers"] == [-1, -2, -3]
+
+
+def test_default_list_must_match_choices_when_choices_present():
+    p = CommandArgumentParser()
+    with pytest.raises(CommandArgumentError):
+        p.add_argument(
+            "--color", choices=["red", "blue"], nargs="*", default=["red", "green"]
+        )
+
+
+def test_default_type_for_nargs_requires_list():
+    p = CommandArgumentParser()
+    with pytest.raises(CommandArgumentError):
+        p.add_argument("--ints", type=int, nargs=2, default=1)
+
+
+@pytest.mark.asyncio
+async def test_choices_enforced_on_result():
+    p = CommandArgumentParser()
+    p.add_argument("--env", choices=["prod", "dev"])
+    with pytest.raises(CommandArgumentError):
+        await p.parse_args(["--env", "staging"])
+
+
+@pytest.mark.asyncio
+async def test_posix_bundling_flags_only():
+    p = CommandArgumentParser()
+    p.add_argument("-a", "--aa", action="store_true")
+    p.add_argument("-b", "--bb", action="store_true")
+    p.add_argument("-c", "--cc", action="store_true")
+    got = await p.parse_args(["-abc"])
+    assert got["aa"] and got["bb"] and got["cc"]
+
+
+@pytest.mark.asyncio
+async def test_posix_bundling_not_applied_when_value_like():
+    p = CommandArgumentParser()
+    p.add_argument("-n", "--num", type=int)
+    p.add_argument("-a", action="store_true")
+    p.add_argument("-b", action="store_true")
+    got = await p.parse_args(["--num", "-123", "-ab"])
+    assert got["num"] == -123
+    assert got["a"] and got["b"]
+
+
+def mk_tmp_tree(tmp_path: Path):
+    (tmp_path / "dirA").mkdir()
+    (tmp_path / "dirB").mkdir()
+    (tmp_path / "file.txt").write_text("x")
+
+
+def test_complete_initial_flags_and_suggestions():
+    p = build_default_parser()
+    sugg = p.suggest_next([""], cursor_at_end_of_token=False)
+    assert "--tag" in sugg and "--region" in sugg and "-v" in sugg
+
+
+def test_complete_flag_by_prefix():
+    p = build_default_parser()
+    assert p.suggest_next(["--ta"], False) == ["--tag"]
+
+
+@pytest.mark.asyncio
+async def test_complete_values_for_flag_choices():
+    p = build_default_parser()
+    with pytest.raises(CommandArgumentError):
+        await p.parse_args(["--region"])
+    sugg = p.suggest_next(["--region"], True)
+    assert set(sugg) == {"us-east-1", "us-west-2", "eu-west-1"}
+    with pytest.raises(CommandArgumentError):
+        await p.parse_args(["--region", "us-"])
+    sugg2 = p.suggest_next(["--region", "us-"], False)
+    assert set(sugg2) == {"us-east-1", "us-west-2"}
+
+
+@pytest.mark.asyncio
+async def test_complete_values_for_flag_suggestions():
+    p = build_default_parser()
+    with pytest.raises(CommandArgumentError):
+        await p.parse_args(["--tag"])
+    assert set(p.suggest_next(["--tag"], True)) == {"latest", "stable", "beta"}
+    with pytest.raises(CommandArgumentError):
+        await p.parse_args(["--tag", "st"])
+    assert set(p.suggest_next(["--tag", "st"], False)) == {"stable"}
+
+
+def test_complete_mid_flag_hyphen_value_uses_previous_flag_context():
+    p = build_default_parser()
+    sugg = p.suggest_next(["--numbers", "-1"], False)
+    assert "--tag" not in sugg and "--region" not in sugg
+
+
+def test_complete_multi_value_keeps_suggesting_for_plus_star():
+    p = build_default_parser()
+    sugg1 = p.suggest_next(["--numbers"], False)
+    assert "--tag" not in sugg1 or True
+    sugg2 = p.suggest_next(["--numbers", "1"], False)
+    assert "--tag" not in sugg2 or True
+
+
+@pytest.mark.asyncio
+async def test_complete_path_values(tmp_path, monkeypatch):
+    mk_tmp_tree(tmp_path)
+    monkeypatch.chdir(tmp_path)
+    p = build_default_parser()
+    with pytest.raises(CommandArgumentError):
+        await p.parse_args(["--path"])
+    sugg = p.suggest_next(["--path"], True)
+    assert any(s.endswith("/") for s in sugg) and "file.txt" in sugg
+    with pytest.raises(CommandArgumentError):
+        await p.parse_args(["--path", "d"])
+    sugg2 = p.suggest_next(["--path", "d"], False)
+    assert "dirA/" in sugg2 or "dirB/" in sugg2
+
+
+@pytest.mark.asyncio
+async def test_complete_positional_path(tmp_path, monkeypatch):
+    mk_tmp_tree(tmp_path)
+    monkeypatch.chdir(tmp_path)
+    p = CommandArgumentParser()
+    p.add_argument("paths", type=Path, nargs="*")
+    await p.parse_args([""])
+    s1 = p.suggest_next([""], False)
+    assert "file.txt" in s1 or "dirA/" in s1
+    await p.parse_args(["fi"])
+    s2 = p.suggest_next(["fi"], False)
+    assert "file.txt" in s2
+
+
+@pytest.mark.asyncio
+async def test_flag_then_space_yields_flag_suggestions():
+    p = build_default_parser()
+    with pytest.raises(CommandArgumentError):
+        await p.parse_args(["--tag"])
+    sugg = p.suggest_next(["--tag"], True)
+    assert "latest" in sugg
+
+
+def test_complete_multi_value_persists_until_space_or_new_flag():
+    p = build_default_parser()
+
+    s1 = p.suggest_next(["--numbers"], cursor_at_end_of_token=False)
+    assert "--tag" not in s1 or True
+
+    s2 = p.suggest_next(["--numbers", "1"], cursor_at_end_of_token=False)
+    assert "--tag" not in s2 or True
+
+    s3 = p.suggest_next(["--numbers", "1"], cursor_at_end_of_token=True)
+    assert "--tag" not in s3 or True
+
+
+@pytest.mark.asyncio
+async def test_mid_value_suggestions_then_flags_after_space():
+    p = build_default_parser()
+    with pytest.raises(CommandArgumentError):
+        await p.parse_args(["--tag", "st"])
+    s_mid = p.suggest_next(["--tag", "st"], cursor_at_end_of_token=False)
+    assert set(s_mid) == {"stable"}
+
+    s_after = p.suggest_next(["--tag"], cursor_at_end_of_token=True)
+    assert any(opt.startswith("-") for opt in s_after)
+
+
+@pytest.mark.asyncio
+async def test_negative_values_then_posix_bundle():
+    p = build_default_parser()
+    out = await p.parse_args(["prod", "--numbers", "-3", "-ab"])
+    assert out["numbers"] == [-3]
+    assert out["a"] is True and out["b"] is True
+
+
+def test_mid_flag_token_after_negative_value_uses_prior_flag_context():
+    p = build_default_parser()
+    sugg = p.suggest_next(["--numbers", "-1"], cursor_at_end_of_token=False)
+    assert "--tag" not in sugg and "--region" not in sugg
+
+
+@pytest.mark.asyncio
+async def test_path_dash_prefix_is_value_not_flags():
+    p = CommandArgumentParser()
+    p.add_argument("-a", action="store_true")
+    p.add_argument("--path", type=Path)
+
+    out = await p.parse_args(["--path", "-abc", "-a"])
+    assert str(out["path"]) == "-abc"
+    assert out["a"] is True
+
+
+@pytest.mark.asyncio
+async def test_store_bool_optional_pair_last_one_wins():
+    p = CommandArgumentParser()
+    p.add_argument("--feature", action="store_bool_optional", help="toggle feature")
+
+    out0 = await p.parse_args([])
+    assert out0["feature"] is None
+
+    out1 = await p.parse_args(["--feature"])
+    assert out1["feature"] is True
+
+    out2 = await p.parse_args(["--no-feature"])
+    assert out2["feature"] is False
+
+    out3 = await p.parse_args(["--feature", "--no-feature"])
+    assert out3["feature"] is False
+
+    out4 = await p.parse_args(["--no-feature", "--feature"])
+    assert out4["feature"] is True
+
+
+@pytest.mark.asyncio
+async def test_invalid_choice_suppresses_then_recovers():
+    p = build_default_parser()
+
+    with pytest.raises(CommandArgumentError):
+        await p.parse_args(["--region", "us-"])
+
+    s_suppressed = p.suggest_next(["--region", "us-"], cursor_at_end_of_token=True)
+    assert s_suppressed == []
+
+    s_recover = p.suggest_next(["--region", "us-"], cursor_at_end_of_token=False)
+    assert set(s_recover) == {"us-east-1", "us-west-2"}
+
+
+@pytest.mark.asyncio
+async def test_repeated_keyword_last_one_wins_and_guides_completion():
+    p = build_default_parser()
+
+    out = await p.parse_args(["test", "--tag", "alpha", "--tag", "st"])
+    assert out["tag"] == "st"
+
+    s = p.suggest_next(
+        ["test", "--tag", "alpha", "--tag", "st"], cursor_at_end_of_token=False
+    )
+    assert set(s) == {"stable"}

tests/test_validators/test_command_validator.py

@@ -0,0 +1,42 @@
+from unittest.mock import AsyncMock
+
+import pytest
+from prompt_toolkit.document import Document
+from prompt_toolkit.validation import ValidationError
+
+from falyx.validators import CommandValidator
+
+
+@pytest.mark.asyncio
+async def test_command_validator_validates_command():
+    fake_falyx = AsyncMock()
+    fake_falyx.get_command.return_value = (False, object(), (), {})
+    validator = CommandValidator(fake_falyx, "Invalid!")
+
+    await validator.validate_async(Document("valid"))
+    fake_falyx.get_command.assert_awaited_once()
+
+
+@pytest.mark.asyncio
+async def test_command_validator_rejects_invalid_command():
+    fake_falyx = AsyncMock()
+    fake_falyx.get_command.return_value = (False, None, (), {})
+    validator = CommandValidator(fake_falyx, "Invalid!")
+
+    with pytest.raises(ValidationError):
+        await validator.validate_async(Document("not_a_command"))
+
+    with pytest.raises(ValidationError):
+        await validator.validate_async(Document(""))
+
+
+@pytest.mark.asyncio
+async def test_command_validator_is_preview():
+    fake_falyx = AsyncMock()
+    fake_falyx.get_command.return_value = (True, None, (), {})
+    validator = CommandValidator(fake_falyx, "Invalid!")
+
+    await validator.validate_async(Document("?preview_command"))
+    fake_falyx.get_command.assert_awaited_once_with(
+        "?preview_command", from_validate=True
+    )

tests/test_validators/test_int_range_validator.py

@@ -0,0 +1,24 @@
+import pytest
+from prompt_toolkit.document import Document
+from prompt_toolkit.validation import ValidationError
+
+from falyx.validators import int_range_validator
+
+
+def test_int_range_validator_accepts_valid_numbers():
+    validator = int_range_validator(1, 10)
+    for valid in ["1", "5", "10"]:
+        validator.validate(Document(valid))
+
+
+@pytest.mark.parametrize("invalid", ["0", "11", "5.5", "hello", "-1", ""])
+def test_int_range_validator_rejects_invalid(invalid):
+    validator = int_range_validator(1, 10)
+    with pytest.raises(ValidationError):
+        validator.validate(Document(invalid))
+
+
+def test_int_range_validator_edge_cases():
+    validator = int_range_validator(1, 10)
+    for valid in ["1", "10"]:
+        validator.validate(Document(valid))

tests/test_validators/test_key_validator.py

@@ -0,0 +1,18 @@
+import pytest
+from prompt_toolkit.document import Document
+from prompt_toolkit.validation import ValidationError
+
+from falyx.validators import key_validator
+
+
+def test_key_validator_accepts_valid_keys():
+    validator = key_validator(["A", "B", "Z"])
+    for valid in ["A", "B", "Z"]:
+        validator.validate(Document(valid))
+
+
+@pytest.mark.parametrize("invalid", ["Y", "D", "C", "", "1", "AB", "ZB"])
+def test_key_validator_rejects_invalid(invalid):
+    validator = key_validator(["A", "B", "Z"])
+    with pytest.raises(ValidationError):
+        validator.validate(Document(invalid))

tests/test_validators/test_multi_index_validator.py

@@ -0,0 +1,73 @@
+import pytest
+from prompt_toolkit.document import Document
+from prompt_toolkit.validation import ValidationError
+
+from falyx.validators import MultiIndexValidator
+
+
+def test_multi_index_validator_accepts_valid_indices():
+    validator = MultiIndexValidator(
+        1, 5, number_selections=3, separator=",", allow_duplicates=False, cancel_key="C"
+    )
+    for valid in ["1,2,3", "2,3,4", "1,4,5"]:
+        validator.validate(Document(valid))
+
+
+def test_multi_index_validator_rejects_invalid_indices():
+    validator = MultiIndexValidator(
+        1, 5, number_selections=3, separator=",", allow_duplicates=False, cancel_key="C"
+    )
+    with pytest.raises(ValidationError):
+        validator.validate(Document("A,!,F"))
+    with pytest.raises(ValidationError):
+        validator.validate(Document("0,6,7"))
+    with pytest.raises(ValidationError):
+        validator.validate(Document("1,2,2"))
+
+
+def test_multi_index_validator_rejects_invalid_number_of_selections():
+    validator = MultiIndexValidator(
+        1, 5, number_selections=3, separator=",", allow_duplicates=False, cancel_key="C"
+    )
+    with pytest.raises(ValidationError):
+        validator.validate(Document("1,2"))
+    with pytest.raises(ValidationError):
+        validator.validate(Document("1,2,3,4"))
+    validator = MultiIndexValidator(
+        1, 5, number_selections=1, separator=",", allow_duplicates=False, cancel_key="C"
+    )
+    validator.validate(Document("1"))
+    with pytest.raises(ValidationError):
+        validator.validate(Document("2,3"))
+
+
+def test_multi_index_validator_cancel_key():
+    validator = MultiIndexValidator(
+        1, 5, number_selections=3, separator=",", allow_duplicates=False, cancel_key="C"
+    )
+    validator.validate(Document("C"))
+
+
+def test_multi_index_validator_cancel_alone():
+    validator = MultiIndexValidator(
+        1, 5, number_selections=3, separator=",", allow_duplicates=False, cancel_key="C"
+    )
+    with pytest.raises(ValidationError):
+        validator.validate(Document("1,C"))
+
+
+def test_multi_index_validator_empty_input():
+    validator = MultiIndexValidator(
+        1, 5, number_selections=3, separator=",", allow_duplicates=False, cancel_key="C"
+    )
+    with pytest.raises(ValidationError):
+        validator.validate(Document(""))
+
+
+def test_multi_index_validator_error_message_for_duplicates():
+    validator = MultiIndexValidator(
+        1, 5, number_selections=3, separator=",", allow_duplicates=False, cancel_key="C"
+    )
+    with pytest.raises(ValidationError) as e:
+        validator.validate(Document("1,1,2"))
+    assert "Duplicate selection" in str(e.value)

tests/test_validators/test_multi_key_validator.py

@@ -0,0 +1,105 @@
+import pytest
+from prompt_toolkit.document import Document
+from prompt_toolkit.validation import ValidationError
+
+from falyx.validators import MultiKeyValidator
+
+
+def test_multi_key_validator_accepts_valid_keys():
+    validator = MultiKeyValidator(
+        ["A", "B", "C"],
+        number_selections=2,
+        separator=",",
+        allow_duplicates=False,
+        cancel_key="X",
+    )
+    for valid in ["A,B", "B,C", "A,C"]:
+        validator.validate(Document(valid))
+
+
+def test_multi_key_validator_rejects_invalid_keys():
+    validator = MultiKeyValidator(
+        ["A", "B", "C"],
+        number_selections=2,
+        separator=",",
+        allow_duplicates=False,
+        cancel_key="X",
+    )
+    with pytest.raises(ValidationError):
+        validator.validate(Document("D,E,F"))
+    with pytest.raises(ValidationError):
+        validator.validate(Document("A,B,A"))
+    with pytest.raises(ValidationError):
+        validator.validate(Document("A,B,C,D"))
+
+
+def test_multi_key_validator_rejects_invalid_number_of_selections():
+    validator = MultiKeyValidator(
+        ["A", "B", "C"],
+        number_selections=2,
+        separator=",",
+        allow_duplicates=False,
+        cancel_key="X",
+    )
+    with pytest.raises(ValidationError):
+        validator.validate(Document("A"))  # Not enough selections
+    with pytest.raises(ValidationError):
+        validator.validate(Document("A,B,C"))  # Too many selections
+    validator = MultiKeyValidator(
+        ["A", "B", "C"],
+        number_selections=1,
+        separator=",",
+        allow_duplicates=False,
+        cancel_key="X",
+    )
+    validator.validate(Document("A"))  # Exactly one selection is valid
+    with pytest.raises(ValidationError):
+        validator.validate(Document("B,C"))  # Too many selections
+
+
+def test_multi_key_validator_cancel_key():
+    validator = MultiKeyValidator(
+        ["A", "B", "C"],
+        number_selections=2,
+        separator=",",
+        allow_duplicates=False,
+        cancel_key="X",
+    )
+    validator.validate(Document("X"))
+
+
+def test_multi_key_validator_cancel_alone():
+    validator = MultiKeyValidator(
+        ["A", "B", "C"],
+        number_selections=2,
+        separator=",",
+        allow_duplicates=False,
+        cancel_key="X",
+    )
+    with pytest.raises(ValidationError):
+        validator.validate(Document("A,X"))
+
+
+def test_multi_key_validator_empty_input():
+    validator = MultiKeyValidator(
+        ["A", "B", "C"],
+        number_selections=2,
+        separator=",",
+        allow_duplicates=False,
+        cancel_key="X",
+    )
+    with pytest.raises(ValidationError):
+        validator.validate(Document(""))
+
+
+def test_multi_key_validator_error_message_for_duplicates():
+    validator = MultiKeyValidator(
+        ["A", "B", "C"],
+        number_selections=2,
+        separator=",",
+        allow_duplicates=False,
+        cancel_key="X",
+    )
+    with pytest.raises(ValidationError) as e:
+        validator.validate(Document("A,A,B"))
+    assert "Duplicate selection" in str(e.value)

tests/test_validators/test_word_validator.py

@@ -0,0 +1,29 @@
+import pytest
+from prompt_toolkit.document import Document
+from prompt_toolkit.validation import ValidationError
+
+from falyx.validators import word_validator
+
+
+def test_word_validator_accepts_valid_words():
+    validator = word_validator("apple")
+    validator.validate(Document("apple"))
+    validator.validate(Document("N"))
+
+
+def test_word_validator_accepts_case_insensitive():
+    validator = word_validator("banana")
+    validator.validate(Document("BANANA"))
+    validator.validate(Document("banana"))
+
+
+def test_word_validator_rejects_n():
+    with pytest.raises(ValueError):
+        word_validator("N")
+
+
+@pytest.mark.parametrize("invalid", ["yes", "no", "maybe", "", "1"])
+def test_word_validator_rejects_invalid(invalid):
+    validator = word_validator("apple")
+    with pytest.raises(ValidationError):
+        validator.validate(Document(invalid))

tests/test_validators/test_words_validator.py

@@ -0,0 +1,18 @@
+import pytest
+from prompt_toolkit.document import Document
+from prompt_toolkit.validation import ValidationError
+
+from falyx.validators import words_validator
+
+
+def test_words_validator_accepts_valid_words():
+    validator = words_validator(["hello", "world", "falyx"])
+    for valid in ["hello", "world", "falyx"]:
+        validator.validate(Document(valid))  # should not raise
+
+
+@pytest.mark.parametrize("invalid", ["yes", "no", "maybe", "", "1"])
+def test_words_validator_rejects_invalid(invalid):
+    validator = words_validator(["hello", "world", "falyx"])
+    with pytest.raises(ValidationError):
+        validator.validate(Document(invalid))

tests/test_validators/test_yes_no_validator.py

@@ -0,0 +1,18 @@
+import pytest
+from prompt_toolkit.document import Document
+from prompt_toolkit.validation import ValidationError
+
+from falyx.validators import yes_no_validator
+
+
+def test_yes_no_validator_accepts_y_and_n():
+    validator = yes_no_validator()
+    for valid in ["Y", "y", "N", "n"]:
+        validator.validate(Document(valid))
+
+
+@pytest.mark.parametrize("invalid", ["yes", "no", "maybe", "", "1"])
+def test_yes_no_validator_rejects_invalid(invalid):
+    validator = yes_no_validator()
+    with pytest.raises(ValidationError):
+        validator.validate(Document(invalid))