#!/usr/bin/env bash

# vim:ts=4:sts=4:sw=4:et

#

# Author: Hari Sekhon

# Date: 2024-08-28 21:07:22 +0200 (Wed, 28 Aug 2024)

#

# https///github.com/HariSekhon/DevOps-Bash-tools

#

# License: see accompanying Hari Sekhon LICENSE file

#

# If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish

#

# https://www.linkedin.com/in/HariSekhon

#

set -euo pipefail

[ -n "${DEBUG:-}" ] && set -x

srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

# shellcheck disable=SC1090,SC1091

. "$srcdir/lib/utils.sh"

# shellcheck disable=SC2034,SC2154

usage_description="

Decompiles a Java jar

Unpacks it in /tmp, finds the Main-Class from the META-INF/MANIFEST.MF

and runs the Java decompiler JD GUI on its main .class file

Uses adjacent script ./jd_gui.sh

which uses ../install/download_jd_gui_jar.sh if the JD GUI jar is not already available

Require Java to already be installed and in the \$PATH

"

# used by usage() in lib/utils.sh

# shellcheck disable=SC2034

usage_args="<jar>"

help_usage "$@"

min_args 1 "$@"

jar="$1"

readlink(){

if is_mac; then

command greadlink "$@"

else

command readlink "$@"

fi

}

if ! [[ "$jar" =~ \.jar$ ]]; then

die "ERROR: arg given is not a JAR file: $jar"

fi

if ! [[ -f "$jar" ]]; then

die "ERROR: jar file not found: $jar"

fi

jar="$(readlink -f "$jar")"

if is_mac; then

jar="${jar/\/private\/tmp/\/tmp}"

fi

if [ "$jar" != "/tmp/${jar##*/}" ]; then

timestamp "Copying JAR to /tmp:"

echo >&2

unalias cp >&/dev/null || :

cp -fv "$jar" /tmp/

echo >&2

fi

cd /tmp/

jar="${jar##*/}"

timestamp "Unpacking JAR"

#echo >&2

tar zxf "$jar"

#echo >&2

echo >&2

timestamp "Determining main class"

main_class="$(awk '/Main-Class:/{print $2}' META-INF/MANIFEST.MF)"

echo >&2

if is_blank "$main_class"; then

die "ERROR: failed to find Main-Class from unpacked jar's META-INF/MANIFEST.MF"

fi

timestamp "Determined main class to be: $main_class"

echo >&2

main_class_file="${main_class//./\/}"

timestamp "Running decompiler on main class: $main_class_file"

echo >&2

"$srcdir/jd_gui.sh" "$main_class_file"