XPI converter for Epyrus

#!/bin/bash

test -z "$1" && {
    echo "Usage: $0 {complete theme xpi}"
    exit 1
}

function try {
    command="$*"
    $command || {
        echo -e "Error while executing command: \E[31m$command\E[0m"
        exit 2
    }
}

BASENAME=$(basename "$1" .xpi)
DIRNAME=$(pwd)
TMPDIR="/tmp/$BASENAME/"
test -d $TMPDIR && try rm -r $TMPDIR
try mkdir $TMPDIR
try cp "$1" $TMPDIR
try cd $TMPDIR
try unzip $BASENAME.xpi install.rdf

grep '<em:targetApplication>' -A5 $TMPDIR/install.rdf > .TARGET
test -f .TARGET || {
    echo -e "Error: \E[31mUnable to write temp file in $TMPDIR!\E[0m"
    exit 3
}
ORIG_TARGET=$(grep "<em:id>" .TARGET | grep -o "{.*}")
ORIG_MINVER=$(grep "<em:minVersion>" .TARGET | grep -Eo "[0-9](\.?[*0-9])*")
ORIG_MAXVER=$(grep "<em:maxVersion>" .TARGET | grep -Eo "[0-9](\.?[*0-9])*")
rm .TARGET

DEST_TARGET="{29877c1d-27df-4421-9a79-382c31470151}"
DEST_MINVER="2.0.0"
DEST_MAXVER="2.1.*"

test -z "$ORIG_TARGET" && {
    echo -e "Error: \E[31mTarget application UUID not found in install.rdf\E[0m"
    exit 4
}

cat <<EOF
------- Original target data -------
Application UUID:   $ORIG_TARGET
Minimum version:    $ORIG_MINVER
Maximum version:    $ORIG_MAXVER

--- Target data after conversion ---
Application UUID:   $DEST_TARGET
Minimum version:    $DEST_MINVER
Maximum version:    $DEST_MAXVER
EOF

# Escape asterisk
ORIG_MINVER=$(echo $ORIG_MINVER | sed "s!\*!\\\*!g")
ORIG_MAXVER=$(echo $ORIG_MAXVER | sed "s!\*!\\\*!g")
DEST_MINVER=$(echo $DEST_MINVER | sed "s!\*!\\\*!g")
DEST_MAXVER=$(echo $DEST_MAXVER | sed "s!\*!\\\*!g")

# Make the replacements
try sed -i "s!<em:id>$ORIG_TARGET</em:id>!<em:id>$DEST_TARGET</em:id>!g" \
    "$TMPDIR/install.rdf"
try sed -i "s!<em:minVersion>$ORIG_MINVER</em:minVersion>!<em:minVersion>$DEST_MINVER</em:minVersion>!g" \
    "$TMPDIR/install.rdf"
try sed -i "s!<em:maxVersion>$ORIG_MAXVER</em:maxVersion>!<em:maxVersion>$DEST_MAXVER</em:maxVersion>!g" \
    "$TMPDIR/install.rdf"

# Update XPI file
try zip "$BASENAME.xpi" install.rdf
try cp -v "$BASENAME.xpi" "$DIRNAME/${BASENAME}_converted.xpi"

rm -r "$TMPDIR"

echo -e "Conversion success: \E[32m$DIRNAME/${BASENAME}_converted.xpi\E[0m"