Auto use Grails 3 versions from gradle.properties

grails

#!/usr/bin/env bash
set -e

# Handy script to auto use the Grails 3 version based on what is defined in the "gradle.properties". This script uses
# the Grails installed by the famous SDKMan so it will look the Grails installation at "~/.sdkman/candidates/grails"
# so only make sure the particular Grails version is installed using "sdk install grails <version>".
#
# The only thing to care about is that this script should be included first in the "PATH" before the
# ".sdkman/candidates/grails/current" is included.
#
# Keeping the name of this script as "grails" so that you don't have to write anything else in order to use the auto
# grails version select feature.

grailsVersionToUse=""

function parseGradleProperties() {
    while read LINE
    do
        propertyName=${LINE%=*}
        propertyValue=${LINE#*=}
        if [ $propertyName == "grailsVersion" ]; then
            grailsVersionToUse=$propertyValue
        fi
    done < <(cat gradle.properties ) # Using process substitution
}

echo -e "${GREEN}➤  Using custom grails command script${NONE}"

if [ -f gradle.properties ]; then
    parseGradleProperties
    echo -e "${BLUE}✓  Using grails version ${grailsVersionToUse}${NONE}\n"

    desiredGrailsCommandPath=~/.sdkman/candidates/grails/$grailsVersionToUse/bin/grails

    # Check if particular Grails version is installed or not
    if [ -f $desiredGrailsCommandPath ]; then
        $desiredGrailsCommandPath $@
    else
        echo -e "${RED}✗  Grails ${grailsVersionToUse} is not installed. Please install using"\
                "${YELLOW}sdk install grails ${grailsVersionToUse}${NONE}${NONE}"
    fi
else
    echo -e "${RED}⚠  Current working directory is not a Grails 3 repository, using default Grails${NONE}\n"
    ~/.sdkman/candidates/grails/current/bin/grails $@
fi

Just make sure, in the $PATH variable, this script is included before the ~/.sdkman/candidates/grails/current is included.

Now just run whatever commands you want to run grails run-app, grails war or any grails command, it will auto use the version as defined in the gradle.properties. For colorful output, you may add the following to your ~/.bashrc or ~/.zshrc:

export NONE='\033[00m'
export RED='\033[01;31m'
export GREEN='\033[01;32m'
export YELLOW='\033[01;33m'
export BLUE='\e[0;36m'
export BOLD='\033[1m'
export UNDERLINE='\033[4m'

Outputs can be like:

When default version is set to 3.2.3 and app version is 3.2.4

When we are not at the root of any Grails 3 app

When a particular Grails 3 version is not installed