home.public.ubuntu-utils/bin/aptq

#! /bin/bash
# Wrap apt queries in a common memorable syntax
# Because I keep looking this stuff up do to differing comands and syntax.
#

set -e; set -u

ARGV=("$@")
ARGC=("$#")
#ARGV=("${ARGV[@]:1}") # shift ARGV
#ARGC=${#ARGV[@]} # get count

# Helper functions
PROG=`basename "$0" | tr -d '\n'`

function info()  { echo `date +%c` ${PROG}\: info: "$@" 1>&2; }
function warn()  { echo `date +%c` ${PROG}\: warning: "$@" 1>&2; }
function error() { echo `date +%c` ${PROG}\: error: "$@" 1>&2; }
function debug() { [[ -v DEBUG ]] && echo `date +%c` ${PROG}\: debug: "$@" 1>&2 || true ; }
function die()   { echo `date +%c` ${PROG}\: fatal: "$@" 1>&2 && exit 1; }


function usage() {
    if [[ "$#" -gt 0 ]]; then
        warn $@
    fi

    cat <<END 1>&2
Usage: aptq QUERY PACKAGE|FILE

where QUERY is one of

 installed	- is PACKAGE installed?
 list           - list the files a package provides
 provides	- what pacakge owns FILE?
END
    exit 1
}


query=""

while [ "$ARGC" != "0" ];do
   case "${ARGV[0]}" in
        -h|--help)
          usage
          ;;
        installed)
            query="installed"
            ;;
        list)
            query="list"
            ;;
        provides)
            query="provides"
            ;;

        *)
            if [[ "$1" =~ ^- ]]; then
                echo unknown flag $1
                usage
            else
                break
            fi
   esac
shift
ARGV=("${ARGV[@]:1}") # shift ARGV
ARGC=${#ARGV[@]} # get count
done

debug ARGV ${ARGV[*]}
debug ARGC ${ARGC}

if [ "$query" == "" ]; then
    warn "no known query given"
    usage
fi

if [ "$query" == "installed" ]; then

    if [[ "$ARGC" != "0" ]]; then
        warn "extra arguments"
        usage
    fi

    apt list --installed

elif [ "$query" == "list" ]; then

    if [[ "$ARGC" < "1" ]]; then
        warn "need a PACKAGE name or FILE"
        usage
    elif [[ "$ARGC" > "1" ]]; then
        warn "extra arguments"
        usage
    fi

    dpkg -L ${ARGV[0]}

elif [ "$query" == "provides" ]; then

    if [[ "$ARGC" < "1" ]]; then
        warn "need a PACKAGE name or FILE"
        usage
    elif [[ "$ARGC" > "1" ]]; then
        warn "extra arguments"
        usage
    fi

    dpkg -S ${ARGV[0]}
fi