install-jar

#!/usr/bin/bash

# Create an executable script that wraps a JAR file so that it can be invoked
# like any other binary. Some primitive checks are applied to avoid accidentally
# overriding existing files.

TARGET=$HOME/.local/share/java

if [ $# -lt 1 ]
then
    echo Usage:
    echo "    $0 <JAR file to be installed>"
    exit 1
fi

if [ ! -f $1 ]
then
    echo JAR file not found. Abort.
    exit 2
fi

# Create target directory if it does not exist.
mkdir -p $TARGET

# Check if a JAR with the same name already exists in the target directory.
JAR_NAME=$(basename $1)
if [ -f $TARGET/$JAR_NAME ]
then
    echo $JAR_NAME already exists in target directory. Abort.
    exit 3
fi

# Check if a file that has the same name as the launch script already exists.
SCRIPT_NAME=$HOME/bin/$(basename $1 .jar)
if [ -f $SCRIPT_NAME ]
then
    echo $SCRIPT_NAME already exists. Abort.
    exit 4
fi

# Copy JAR
echo Installing $JAR_NAME in $TARGET
cp $1 $TARGET/$JAR_NAME

# Create launch script
SCRIPT_CODE="#!/usr/bin/bash
java -jar $TARGET/$JAR_NAME \$@"
echo "$SCRIPT_CODE" > $SCRIPT_NAME
chmod +x $SCRIPT_NAME

echo Done.