#!/bin/bash
#
# Creates Slackware tagfiles for minimal, base, and desktop "ready"
# installations.
#
# Author: Jason Graham <jgraham@compukix.net>
#

set -e

TYPE="$1"
PKG_TREE="$2"

MIN_SERIES_SKIP_LIST=( e f k kde kdei l t tcl x xap xfce y )
BASE_SERIES_SKIP_LIST=( e f k kde kdei t x xap xfce y )
DESKTOP_SERIES_SKIP_LIST=( f k kde kdei t xfce y )
FULL_SERIES_SKIP_LIST=( ${DESKTOP_SERIES_SKIP_LIST[@]} )
		       
REQ_LIST=( \
	   ca-certificates \
	       cgmanager \
	       dhcpcd \
	       dbus \
	       dialog \
	       diffutils \
	       elogind \
	       file \
	       gc \
	       gnupg \
	       guile \
	       iproute2 \
	       kernel-source \
	       libffi \
	       libmpc \
	       libmnl \
	       libnih \
	       libunistring \
	       nano \
	       ncurses \
	       perl \
	       slackpkg \
	       wget \
	       which \
    )

if (( $# != 2 ));    then
    echo "Usage `basename $0` {min|base|desktop|full} <package-tree>"
    exit 1
fi

function disable_series {
    local tagfile="$1/tagfile"
    sed -i 's/\(.*\):.*/\1:SKP/' $tagfile
}

function prepare_tagfiles {
    local pkg_tree="$1"

    for s in `find $pkg_tree -mindepth 1 -maxdepth 1 -type d`
    do
	local tagfile="$s/tagfile"
	local series="${s##*/}"
	rm -rf $series
	mkdir $series

	cat $tagfile > $series/tagfile

	if [ ! -z ${SERIES_SKIP[$series]} ]; then
	       disable_series $series
	fi
    done
}

if [ "$TYPE" == "min" ]; then
    REC="SKP"
    OPT="SKP"
    TAGDIR="minimal"
    SERIES_SKIP_LIST=( ${MIN_SERIES_SKIP_LIST[@]} )
elif [ "$TYPE" == "base" ]; then
    REC="ADD"
    OPT="SKP"
    TAGDIR="base"
    SERIES_SKIP_LIST=( ${BASE_SERIES_SKIP_LIST[@]} )    
elif [ "$TYPE" == "desktop" ]; then
    REC="ADD"
    OPT="SKP"
    TAGDIR="desktop"
    SERIES_SKIP_LIST=( ${DESKTOP_SERIES_SKIP_LIST[@]} )    
elif [ "$TYPE" == "full" ]; then
    REC="ADD"
    OPT="ADD"
    TAGDIR="full"
    SERIES_SKIP_LIST=( ${FULL_SERIES_SKIP_LIST[@]} )    
else
    echo "incorrect tagfile type: $TYPE"
    exit 1
fi

PKG_TREE=$(realpath $PKG_TREE)

# Make sure a PACKAGES.TXT exists
if [ ! -f "$PKG_TREE/PACKAGES.TXT" ]; then
    echo "$PKG_TREE is not a valid slackware package tree"
    exit 1
fi

declare -A SERIES_SKIP
for s in ${SERIES_SKIP_LIST[@]}
do
    SERIES_SKIP[$s]=1
done

rm -rf $TAGDIR
mkdir $TAGDIR
cd $TAGDIR

prepare_tagfiles "$PKG_TREE"

for s in `find . -mindepth 1 -maxdepth 1 -type d`
do
    tagfile="$s/tagfile"

    sed "s/REC/$REC/g" $tagfile | \
    sed "s/OPT/$OPT/g" \
	> .tmp
    mv .tmp $tagfile

    for req in ${REQ_LIST[@]}
    do
    	sed -i "s/^${req}:.*/${req}:ADD/" $tagfile
    done
    
done

cd ..
tar zcvf $TAGDIR.tar.gz $TAGDIR
rm -rf $TAGDIR