color pager

p

#!/bin/bash
# color pager
# run command with appropriate color option (like --color-output for 'jq') and pipe to a pager
if which lv >/dev/null 2>&1
then
    pager=(lv -c)
else
    pager=(less -R)
fi

set -u -e

help () {
    echo "Usage: ${0##*/} {grep|jq|...} [OPTIONS...]"
}

[ $# -eq 0 ] && { help; exit 1; }

case $1 in
    -h|--help)
        echo "Usage: ${0##*/} [grep|jq]"
        exit 1
        ;;
esac

cmd=$1
shift

color=()
case $cmd in
grep|[fe]grep|cargo)
    color=('--color=always');;
jq)
    color=('--color-output');;
hmlgrep|amlgrep|jq-grep|ls)
    color=('--color');;
esac

set +u # allow ${color[@]} to be empty
case "$cmd" in
# --color option has to be suffixed after subcommand for cargo
cargo) args=("$@" "${color[@]}");;
*)     args=("${color[@]}" "$@");;
esac

"$cmd" "${args[@]}" 2>&1 | "${pager[@]}"
exit ${PIPESTATUS[0]}