composer

#!/usr/bin/env bash
# beporter@users.sourceforge.net

#---------------------------------------------------------------------
usage ()
{
	cat <<EOT

${0##*/}
    Wrapper around composer to make it "aware" of a custom
    \`COMPOSER_NODEV\` environment variable. If that variable is set
    when this script is executed, the `--no-dev` flag will be prepended
    to the command line arguments. All arguments to this script are
    passed directly through to composer, except for -h which displays
    this wrapper script's help text. (Use \`--help\` to get composer's
    help.)

    For this script to work effectively, you should be in the habit of
    calling \`composer\` (without the ".phar" and with the file available
    in your PATH already.)

    This version of the script is "insidious" in that it will install
    itself in place of an existing composer binary. It's also capable of
    installing the real composer for you if it isn't already available,
    making it a drop-in replacement for the regular composer install
    instructions. Is this dangerous? Yup, it sure is. Should you trust
    this script? Probably not. To understand why it exists, see:
    https://github.com/composer/composer/issues/4408

    To install composer and this wrapper, execute the following
    EXTREMELY DANGEROUS command from your system's command line:

    $ curl -sS https://raw.githubusercontent.com/loadsys/CakePHP-Shell-Scripts/master/composer > composer && bash composer >/dev/null

    NOTE: You may need to use \`sudo bash composer\` in the above command.

Usage:
    ${0##*/} [options] [arguments]


EOT

	exit ${1:-0}  # Exit with code 0 unless an arg is passed to the method.
}
if [ "$1" = '-h' ]; then
	usage
fi

COMPOSER_DEFAULT_PATH="/usr/local/bin/composer"

# If there's already a `composer` in PATH, make sure it isn't already
# THIS wrapper, and replace it with this wrapper.
COMPOSER_WRAPPER="$(which composer)"
if [ -n "$COMPOSER_WRAPPER" ] && ! grep -q "COMPOSER_WRAPPER" "$COMPOSER_WRAPPER"; then
	echo "Replacing existing $COMPOSER_WRAPPER with wrapper script $0" >&2
	mv "$COMPOSER_WRAPPER" "${COMPOSER_WRAPPER}.phar"
	mv "$0" "${COMPOSER_WRAPPER}"
	chmod a+x "${COMPOSER_WRAPPER}"
elif [ -z "$COMPOSER_WRAPPER" ]; then
	COMPOSER_WRAPPER="$COMPOSER_DEFAULT_PATH"
	echo "Installing composer wrapper script as ${COMPOSER_WRAPPER}" >&2
	mv "$0" "${COMPOSER_WRAPPER}"
	chmod a+x "${COMPOSER_WRAPPER}"
fi

# If there isn't already a composer.phar executable, download and install it.
COMPOSER_BINARY="$(which composer.phar)"
if [ -z "$COMPOSER_BINARY" ]; then
	COMPOSER_BINARY="${COMPOSER_WRAPPER}.phar"
	echo "composer.phar not found in PATH. Installing as $COMPOSER_BINARY" >&2
	curl -sS https://getcomposer.org/installer | \
		php -- --install-dir=${COMPOSER_BINARY%/*} --filename=${COMPOSER_BINARY##*/}
fi

# Execute the "real" composer with all args and all piped/redirected input.
"$COMPOSER_BINARY" ${COMPOSER_NODEV+"--no-dev"} "$@" <&0