def show_usage(cli: Genbu, error: bool = False):
name = " ".join(cli.complete_name()) or "cli"
footer = f"Try '{name} -h' for more information."
_usage = usage(cli, "Genbu CLI example with subcommands.", footer)
if error:
sys.exit(_usage)
print(_usage)
sys.exit(0)
from pathlib import Path
import sys
from genbu import Genbu, Param, combinators as comb, usage
def cat(path: Path) -> str:
"""Concatenate contents of path to stdout."""
return path.read_text()
cli = Genbu(
cat,
params=[
Param("path", ["-p", "--path"], comb.One(Path)),
Param(
"help_",
["-?", "-h", "--help"],
comb.Emit(True),
aggregator=lambda _: sys.exit(usage(cli)),
),
],
)
if __name__ == "__main__":
try:
print(cli.run())
except Exception as exc:
name = " ".join(cli.complete_name())
print(f"{name}: {exc}\nTry '{name} -h' for more information.")