pyclir 0.2.2

A modern CLI toolkit for building beautiful terminal applications

Clir

A modern CLI toolkit for building beautiful terminal applications in Python.

Features

• Command Framework - Decorator-based command registration with type-annotated arguments
• Advanced Options - Repeatable options, fixed-arity options, and flag-to-parameter aliasing
• Rich Terminal Output - Colored text, tables, panels, progress bars, and spinners
• Interactive Prompts - Text input, confirmation dialogs, and selection prompts
• Type Inference - Automatically infer argument types from function signatures
• Async Support - Commands can be async functions
• Testing Utilities - Built-in tools for testing CLI applications

Installation

pip install pyclir

pyclir is the PyPI distribution name; the import package is clir (import clir). The name clir was already taken on PyPI.

Quick Start

from clir import ClirApp, argument, option
from clir.output import success, error, Table

app = ClirApp(
    name="mycli",
    description="My awesome CLI",
)

@app.command()
@argument("name")
@option("--count", "-c", default=1)
def greet(name: str, count: int):
    """Greet someone warmly."""
    for _ in range(count):
        success(f"Hello, {name}!")

@app.command()
def status():
    """Show system status."""
    t = Table("Component", "Status")
    t.add_row("Database", "Connected")
    t.add_row("API", "Running")
    t.show()

if __name__ == "__main__":
    app.run()

Advanced Options

@option supports repeatable options, fixed-arity options, and binding a flag to a differently-named Python parameter.

from pathlib import Path
from clir import ClirApp, argument, option

app = ClirApp(name="mycli")

@app.command()
# Repeatable: pass --salvage more than once; values collect into a list.
@option("--salvage", multiple=True, default=None, help="Salvage file (repeatable)")
# Fixed-arity: --compare A B consumes exactly two values.
@option("--compare", nargs=2, default=None, help="Two models to compare")
# dest-aliasing: the CLI flag is --in, the function parameter is in_path.
@option("--in", dest="in_path", help="Input file")
# pathlib.Path is a supported type; the function receives a Path.
@option("--out", type=Path, default=None, help="Output path")
def run(salvage, compare, in_path, out):
    # mycli run --salvage a.jsonl --salvage b.jsonl --compare m1 m2 --in data.txt
    #   salvage == ["a.jsonl", "b.jsonl"]   (None when not passed)
    #   compare == ["m1", "m2"]             (None when not passed)
    #   in_path == "data.txt"
    ...

• multiple=True — the option may be passed repeatedly; every value is collected into a list. Use default=None to distinguish "not passed" from "passed empty".
• nargs=N — the option consumes exactly N values at once; the bound value is an N-element list. Combine with multiple=True for a list of fixed-length lists.
• dest="..." — binds the option (or argument) to a Python parameter whose name differs from the flag spelling — useful when the flag would be a Python keyword (--in, --class). Works on @argument too.
• type= — str, int, float, bool, and pathlib.Path are all supported; for list-valued options the type converts each element.

Output Functions

from clir.output import success, error, warning, info, debug, Table, Panel

success("Operation completed!")  # Green bold
error("Something went wrong")     # Red bold
warning("Be careful")             # Yellow bold
info("Here's some info")          # Cyan
debug("Debug message")            # Dim

# Tables
t = Table("Name", "Age")
t.add_row("Alice", "30")
t.add_row("Bob", "25")
t.show()

# Panels
Panel("Content", title="My Panel").show()

Interactive Prompts

from clir.prompts import prompt, confirm, select

# Text input
name = prompt("What is your name?")

# Confirmation
if confirm("Continue?", default=True):
    print("Continuing!")

# Selection
choice = select("Choose:", ["Option 1", "Option 2", "Option 3"])

Testing

from clir import ClirApp
from clir.testing import CliRunner

app = ClirApp(name="test")

@app.command()
def hello():
    print("Hello!")

runner = CliRunner(app)
result = runner.invoke(["hello"])

assert result.exit_code == 0
assert "Hello" in result.output

License

MIT