Composer wrapper script that checks whether composer is installed in the system. If not - install it to bin folder of this script. Idea is taken from gradle and gradlew that I've been struggling with during this weekend.

composerw

#!/bin/bash
# Composer wrapper script that checks whether composer is installed in the system. If not - install it to bin folder of this script
# Idea is taken from gradle and gradlew that I've been struggling with during this weekend
# author - Alex Vasilenko http://github.com/mente 

# Exit on any failure
set -e

#http://stackoverflow.com/questions/59895/can-a-bash-script-tell-what-directory-its-stored-in
BASEDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

#http://stackoverflow.com/questions/592620/check-if-a-program-exists-from-a-bash-script
cmdPath() {
    echo `command -v "${1}"`
}

#http://getcomposer.org/download/
installComposer() {
    PHP_CMD=$(cmdPath "php")
    if [ -z ${PHP_CMD} ]; then
        echo "PHP executable not found in $PATH"
        exit 1
    fi
    CURL_CMD=$(cmdPath "curl")
    if [ ${CURL_CMD} ]; then
        ${CURL_CMD} -sS https://getcomposer.org/installer | ${PHP_CMD} -- --install-dir=$1
    else
        ${PHP_CMD} -r "eval('?>'.file_get_contents('https://getcomposer.org/installer'));" -- --install-dir=$1
    fi
}

BIN=${BASEDIR}/bin
if [ -f ${BIN}/composer.phar ]; then
    COMPOSER_CMD=${BIN}/composer.phar
else
    COMPOSER_CMD=$(cmdPath "composer") || $(cmdPath "composer.phar")
fi 

if [ -z ${COMPOSER_CMD} ]; then
    echo "Unable to find composer in PATH. Installing"
    installComposer ${BIN}
    COMPOSER_CMD=${BIN}/composer.phar
fi

exec "$COMPOSER_CMD" "$@"