pick

#!/bin/bash

set -eu
set -o pipefail

help() {
    cat <<EOT
Select items from a list, interactively or not.

pick -h|--help
    This help
pick [-g|--grep] pattern ...
    Only include results matching <pattern>.
    If multiple patterns are given, all must match.
pick -i|--ignore pattern ...
    Exclude results matching <pattern>.
pick -p|--percol ...
    Interactively filter the resources with Percol.
pick --skip-header-line ...
    Ignore the first line of input.
EOT
}

INCLUDE=""
EXCLUDE=""
PERCOL=""
SKIP_HEADER_LINE=""
while (( ${#*} > 0 )); do
    case $1 in
        -h|--help)
            help
            exit
            ;;
        -g|--grep)
            shift
            INCLUDE="$INCLUDE|$1"
            shift
            ;;
        -i|--ignore)
            shift
            EXCLUDE="$EXCLUDE|$1"
            shift
            ;;
        -p|--percol)
            shift
            PERCOL=1
            ;;
        --skip-header-line)
            shift
            SKIP_HEADER_LINE=1
            ;;
        *)
            INCLUDE="$INCLUDE|$1"
            shift
            ;;
    esac
done
INCLUDE="${INCLUDE#|}"
EXCLUDE="${EXCLUDE#|}"

CMD="awk '1 ${SKIP_HEADER_LINE:+&& NR>1 }${INCLUDE:+&& /$INCLUDE/ }${EXCLUDE:+&& !/$EXCLUDE/ }{ print \$1 \" \" \$2; }'"
if [[ -n "$PERCOL" ]]; then
  eval $CMD | column -t | percol
  exit
fi
eval $CMD