#!/bin/sh -e
#
#    byobu-export
#    Copyright (C) 2008-2010 Canonical Ltd.
#
#    Authors: Dustin Kirkland <kirkland@canonical.com>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, version 3 of the License.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -e

PKG="byobu"
DIR=`mktemp -t -d $PKG.XXXXXXXX` || error "Could not create a temporary directory"
[ -d "$TMP" ] || TMP=/tmp

# Make sure we clean up $DIR if we exit for any reason
trap "rm -rf "$DIR" "$file" 2>/dev/null || true" EXIT HUP INT QUIT TERM

usage() {
	echo
	echo "Usage:"
	echo " $0 [-f TARGET.tar.gz]"
	echo
	echo "If TARGET.tar.gz is unspecified, $TMP/$PKG.tar.gz will be used."
	echo
	exit 1
}

error() {
	echo "ERROR: $1" 1>&2
	[ -f "$file" ] && rm -f "$file"
	exit 1
}

# Handle command line parameters
file=
while [ $# -gt 1 ]; do
	case "$1" in
		-f)
			file="$2"
			shift 2
		;;
		*)
			usage
		;;
	esac
done

# Handle filename
[ $# -eq 1 ] && file="$1"
if [ -z "$file" ]; then
	file="$TMP/$PKG.tar.gz"
fi
echo "$file" | grep -qs "\.tar\.gz$" || error "Target file must be a '.tar.gz' archive"
if [ -e "$file" ]; then
	echo `gettext "File exists"` " [$file]"
	echo -n "`gettext 'Remove file? [y/N] '`"
	remove=`head -n1`
	if [ "$remove" = "Y" -o "$remove" = "y" ]; then
		rm -f "$file"
	else
		exit 1
	fi
fi

# Create workspace
for i in etc usr/bin usr/lib usr/share/doc; do
	mkdir -p "$DIR/.$PKG/$i"
done
dpkg-query --show --showformat '${Package} ${Version}\n' $PKG > "$DIR/.$PKG/version" 2>/dev/null || true
echo "http://launchpad.net/$PKG" >> "$DIR/.$PKG/version"
printf "FOREGROUND=w\nBACKGROUND=k\nMONOCHROME=0" > "$DIR/.$PKG/color"

# Copy necessary scripts
cp -a /etc/$PKG "$DIR/.$PKG/etc"
cp -a /usr/share/$PKG "$DIR/.$PKG/usr/share"
cp -a /usr/share/doc/$PKG "$DIR/.$PKG/usr/share/doc"
cp -a /usr/lib/$PKG "$DIR/.$PKG/usr/lib"
cp -a /usr/bin/$PKG-* "$DIR/.$PKG/usr/bin"
cp /etc/$PKG/statusrc "$DIR/.$PKG/status"
echo "source \$HOME/.$PKG/profile" > "$DIR/.screenrc"
echo "source \$HOME/.$PKG/usr/share/$PKG/keybindings/common" > "$DIR/.$PKG/keybindings"
ln -sf usr/share/$PKG/profiles/common "$DIR/.$PKG/profile"
ln -sf usr/share/$PKG/ec2/rates.us_ca "$DIR/.$PKG/ec2_rates"

# Some gardening; update paths to be $HOME-based
for i in /usr/bin/$PKG-*; do
	if echo "$i" | grep -qs "install"; then
		continue
	fi
	bin=$(basename "$i")
	sed -i "s:$bin:\$HOME/.$PKG$i:g" $(find $DIR -type f)
done
for i in /etc/ /usr/lib/ /usr/share/; do
	sed -i "s:$i$PKG:\$HOME/.$PKG$i$PKG:g" $(find $DIR -type f)
	sed -i "s:$i\$PKG:\$HOME/.$PKG$i\$PKG:g" $(find $DIR -type f)
	sed -i "s:\$HOME/\.$PKG$i\$HOME/\.$PKG$i:\$HOME/.$PKG$i:g" $(find $DIR -type f)
done
sed -i "s:\$HOME/\.$PKG\$HOME/\.$PKG:\$HOME/.$PKG:g" $(find $DIR -type f)
sed -i "s:\$HOME/\.$PKG/usr/bin/\$HOME/\.$PKG/usr/bin/:\$HOME/.$PKG/usr/bin/:g" $(find $DIR -type f)

rm -f $DIR/.$PKG/usr/bin/$PKG-export

# tar up the results
tar --owner=root --group=root -zcf "$file" -C "$DIR" . || error "Could not create archive"

echo
echo "Success!"
echo
echo "  "`gettext "Archive"` ": [$file]"
echo
echo `gettext "Extract the archive in your home directory on the target system."`
echo