Script to launch appropriate Grails version for current application

grails

#!/bin/bash

# Check if GRAILS_PREFIX is set
if [ -z $GRAILS_PREFIX ]; then
    echo "You must define environment variable GRAILS_PREFIX before running Automatic Grails Version Selector"
    exit 1
fi

# Define script params array
declare -a PARAMS

# Process script parameters
for PARAM in $*; do
    if [ ${PARAM:0:5} == "-ver:" ]; then
        # Extract version from -ver parameter
        GRAILS_VERSION=${PARAM:5}
    else
        # Add parameter to array, so that it is passed to original script
        PARAMS=( "${PARAMS[@]}" "$PARAM" )
    fi
done

# If version to use is not specified, try to detect it
if [ -z $GRAILS_VERSION ]; then
    # Check if application.properties file exists
    if [ -e application.properties ]; then
        # Get required Grails version
        # Note that CR characters are removed at first
        GRAILS_VERSION=`tr -d '\015' <  application.properties | sed -n 's/app.grails.version=\(.*\)$/\1/p'`
    else
        echo "Current directory doesn't represent existing Grails project, specify version as -ver:1.3.1"
        exit 1
    fi
fi

# Set Grails home using configured prefix and determined version
export GRAILS_HOME=$GRAILS_PREFIX$GRAILS_VERSION

# Check if GRAILS_HOME directory exists
if [ -d  $GRAILS_HOME ]; then
    # Run original Grails script
    $GRAILS_HOME/bin/grails ${PARAMS[@]}
else
    echo Grails home directory for this project does not exist: $GRAILS_HOME
    echo The current project might have updated to a newer Grails version.
    echo Make sure you have downloaded and installed the version of Grails required: $GRAILS_VERSION
    exit 1
fi