usecli 0.1.77

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About

useCli A powerful Python CLI framework for building beautiful, developer-friendly command-line tools. It gives you:

• Prefix matching — Type he instead of help
• Interactive mode — Fuzzy finder for commands
• Auto-generated help — Clean, styled output
• Command scaffolding — make:command generates boilerplate
• UI components — Prompts, menus, styled console output

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Quick Start

Install usecli with uv (recommended)

uv add usecli

Install with pip (alternative)

pip install usecli

Initialize

usecli init

Create a command

usecli make:command hello

Your new command is ready in the commands directory:

class HelloCommand(BaseCommand):
    def signature(self) -> str:
        return "hello"

    def description(self) -> str:
        return "Say hello"

    def handle(self, name: str = Argument(..., help="Your name")) -> None:
        console.print(f"Hello, {name}!")

Run it:

usecli hello world

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Usage

Prefix Matching

Type partial command names:

usecli he          # help
usecli ma:co       # make:command

Interactive Mode

usecli --interactive    # Fuzzy finder for all commands
usecli -i hello         # Run 'hello' command interactively

Command Groups

Colon-separated commands group automatically in help:

def signature(self) -> str:
    return "db:migrate"

Displays as:

db:
  migrate    Run migrations
  backup     Backup database

Space-separated signatures create nested subcommands:

def signature(self) -> str:
    return "spec show"  # usecli spec show

JSON Output

Every command inherits --json; commands do not declare the option themselves. The flag works before or after a command name:

usecli --json about
usecli about --json

A successful invocation writes exactly one JSON document to stdout:

{"ok":true,"data":null}

A command can return any JSON-serializable value to populate data:

class StatusCommand(BaseCommand):
    def signature(self) -> str:
        return "status"

    def description(self) -> str:
        return "Show service status"

    def handle(self):
        return {"status": "ready", "workers": 3}

Failures preserve a non-zero exit status and use a stable error envelope:

{"ok":false,"error":{"type":"UsageError","message":"No such command","code":2}}

In JSON mode, stdout is reserved for that document. Human-facing output, including console.print() and ordinary print(), is routed to stderr. Prompts and confirmations resolve their declared defaults without reading stdin. A prompt without a default, menus, and --interactive fail immediately with a structured NonInteractiveError instead of blocking.

The existing fields ok, data, error, error.type, error.message, and error.code keep their names and types across compatible releases. New fields may be added.

UI Components

from usecli import Confirm, Menu, Prompt, console

console.print("[green]Done![/green]")
name = Prompt.ask("Enter name")
ok = Confirm.ask("Continue?")
choice = Menu.select(["A", "B", "C"])

Progress Indicators

Use Spinner when the amount of work is unknown and ProgressBar when a total is known:

from usecli import ProgressBar, Spinner

with Spinner("Loading records") as spinner:
    load_records()
    spinner.update("Indexing records")

with ProgressBar(total=len(items), description="Processing") as progress:
    for item in items:
        process(item)
        progress.advance()

Progress always renders to stderr, uses the active usecli theme, and is suppressed automatically in JSON mode, with quiet=True, or when stderr is not attached to a terminal. Calling commands do not need to detect these conditions.

Available Commands

about        Show app info
help         Show help
init         Initialize usecli (usecli only)
inspire      Random quote
make:command Create new command (usecli only)
make:theme   Create new theme (usecli only)

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Development

See the Development Guide for setup, testing, and architecture details.

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Contributing

Read the Contributing Guide.

Quick workflow:

1. Fork and branch: git checkout -b feature/name
2. Make changes
3. Run checks: uv run poe clean-full
4. Commit and push
5. Open a Pull Request

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License

MIT. See LICENSE.

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