#!/bin/sh

# apt-iselect: interactive apt-cache search tool
#
# Dobrica Pavlinusic <dpavlin@rot13.org>
# http://www.rot13.org/~dpavlin/apt-iselect.html
#
# 2003-08-02 first version
# 2003-08-03 using mktemp to create temp files, auto-install iselect
# 2003-08-04 catch signals so temp files are not left behind, added
#       enter new search at end of results, autoconfig
#
# I know it's ugly, but it's still faster than aptitude :-)
#
# It will automatically use sudo if installed or require user to be root
# because apt-cache needs this. It will also install iselect deb package
# if it's not already there.
#
# WARNING: due to iselect limitation, maximum number of results is
# 1020 and maximum length of all results is 1048576 bytes

if [ ! -z "`which sudo`" ] ; then
    id=`sudo -p "Using sudo, please enter your password: " id -u`
    sudo="sudo"
else
    id=`id -u`
    sudo=""
fi

if [ "$id" != 0 ] ; then
    echo "You really need to be root to use apt-cache and thus, apt-iselect !"
    echo "One way to do this is to install sudo which will be automatically used..."
    exit 1
fi

if [ -z "`which iselect`" ] ; then
    echo "You really need iselect for apt-iselect, installing..."
    $sudo apt-get install iselect
fi

if [ -z "$*" ] ; then
    echo "Usage: $0 [search pattern for apt-cache search]"
    exit 1
fi

res=`mktemp -q /tmp/apt.iselect.XXXXXX` || ( echo "Can't create temp file!" ; exit 1 )
res2=`mktemp -q /tmp/apt.iselect.XXXXXX` || ( echo "Can't create temp file!" ; rmtemp ; exit 1 )
pkg=`mktemp -q /tmp/apt.iselect.XXXXXX` || ( echo "Can't create temp file!" ; rmtemp ; exit 1 )

function rmtemp() {
    rm -f $res
    rm -f $res2
    rm -f $pkg
}

trap 'rmtemp; exit 1' INT QUIT TERM SEGV

function apt_cache_search() {
    search_words=$*

    echo "Searching apt-cache for \"$search_words\"..."

    apt-cache search "$*" | head -1020 > $res
    nr=`wc -l $res | sed 's/^ *//' | cut -d" " -f1`
    if [ $nr = 0 ] ; then
        echo "No results for \"$search_words\"" > $res2
        nr="no"
    else
        echo -e "$nr results for \"$search_words\", enter new search <s:search=%[Search for]S>\n" > $res2
        cat $res | sed 's/^/<s>/' >> $res2
    fi
    echo -e "\nEnter new apt-cache search <s:search=%[Search for]S>" >> $res2
}

apt_cache_search $*

pkg_nr=3
loop=1

while [ $loop = 1 ] ; do

    loop=0;
    tmp=`iselect -P -p $pkg_nr -n "apt-iselect: $nr results for \"$search_words\"" < $res2`

    if echo $tmp | grep search= >/dev/null ; then
        apt_cache_search `echo $tmp | cut -d= -f2`
        loop=1
    else
        # not search, find package info

        pkg_nr=`echo $tmp | cut -d: -f1`
        pkg_full=`echo $tmp | cut -d: -f2`
        pkg_name=`echo $pkg_full | cut -d" " -f1`

        if [ ! -z "$pkg_name" ] ; then
            echo -e '<s>Back to search results\n' > $pkg
            apt-cache show $pkg_name | sed 's/^\(Package: \)/<s>\1/' >> $pkg
            echo '<s>Back to search results' >> $pkg

            tmp=`iselect -n "Package: $pkg_full" < $pkg`
            if echo $tmp | grep -i back >/dev/null ; then
                loop=1
            elif echo $tmp | grep '^Package: ' >/dev/null ; then
                deb=`echo $tmp | cut -d: -f2`
                $sudo apt-get install $deb
            fi
        fi
    fi
done

rmtemp