commout

#!/usr/bin/env python3

import click
from plumbum.cmd import grep, cat

@click.command()
@click.argument("filename")
@click.option("--comment-token", "-t", default = "#", show_default=True,
                help = "Set the comment token.")
@click.option("--context",       "-c", default = 0,   show_default=True,
                help = "Display N preceding comment line(s).")
@click.option("--no-separators", "-v", is_flag = True,
                help = "Avoid displaying context separators.")
def cli(filename, comment_token, context, no_separators):
    click.echo(comment_token)
    output = (cat[filename] | grep["-v", "^$"] | grep["-v", "^"+comment_token, "-B", context])
    if no_separators:
        output = (output | grep["-v", "^--"])
    click.echo(output())

if __name__ == '__main__':
     cli()