shell/install/composer

#!/bin/bash
##makedesc: Install composer (latest)
echo
echo "==============================================="
echo "Installing composer (latest)..."
echo "==============================================="
echo

# https://getcomposer.org/doc/faqs/how-to-install-composer-programmatically.md

installed() {
    command -v "$1" >/dev/null 2>&1
}

! installed "php" && echo "WARNING: You need php to be installed"

if installed "composer"; then
    echo "WARNING: Removing current composer to install its actual version"
    sudo apt remove -y --autoremove composer
    sudo rm /bin/composer
    sudo rm /usr/bin/composer
    sudo rm /usr/local/bin/composer
    sudo rm /usr/src/composer
    rm $HOME/.local/bin/composer
fi

mkdir -p $HOME/install && cd $HOME/install
# mkdir -p $HOME/.local/bin

EXPECTED_CHECKSUM="$(php -r 'copy("https://composer.github.io/installer.sig", "php://stdout");')"
# php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
wget https://getcomposer.org/installer -O composer-setup.php
ACTUAL_CHECKSUM="$(php -r "echo hash_file('sha384', 'composer-setup.php');")"
if [ "$EXPECTED_CHECKSUM" != "$ACTUAL_CHECKSUM" ]; then
    >&2 echo 'ERROR: Invalid installer checksum'
    rm composer-setup.php
    exit 1
fi
php composer-setup.php --quiet
cp $HOME/install/composer.phar $HOME/.local/bin/composer
cd - >/dev/null

COMPOSER_GLOBAL_HOME="$(composer config -g home)"
NEWPATH="export PATH=\"$COMPOSER_GLOBAL_HOME/vendor/bin:\${PATH}\""
cat "${HOME}/.profile" | grep -qoh "$NEWPATH" || {
    $NEWPATH
    echo "$NEWPATH" >> "${HOME}/.profile"
}

echo
echo "Finish!"
echo

composer --version