#!/bin/bash
set -e

cd "$(php -r 'echo ini_get("extension_dir");')"

usage() {
	echo "usage: $0 module-name [module-name ...]"
	echo "   ie: $0 gd mysqli"
	echo "       $0 pdo pdo_mysql"
	echo
	echo 'Possible values for module-name:'
	echo $(find -maxdepth 1 -type f -name '*.so' -exec basename '{}' ';' | sort)
}

modules=()
while [ $# -gt 0 ]; do
	module="$1"
	shift
	if [ -z "$module" ]; then
		continue
	fi
	if [ -f "$module.so" -a ! -f "$module" ]; then
		# allow ".so" to be optional
		module+='.so'
	fi
	if [ ! -f "$module" ]; then
		echo >&2 "error: $(readlink -f "$module") does not exist"
		echo >&2
		usage >&2
		exit 1
	fi
	modules+=( "$module" )
done

if [ "${#modules[@]}" -eq 0 ]; then
	usage >&2
	exit 1
fi

for module in "${modules[@]}"; do
	if grep -q zend_extension_entry "$module"; then
		# https://wiki.php.net/internals/extensions#loading_zend_extensions
		line="zend_extension=$(readlink -f "$module")"
	else
		line="extension=$module"
	fi

	ext="$(basename "$module")"
	ext="${ext%.*}"
	if php -r 'exit(extension_loaded("'"$ext"'") ? 0 : 1);'; then
		# this isn't perfect, but it's better than nothing
		# (for example, 'opcache.so' presents inside PHP as 'Zend OPcache', not 'opcache')
		echo >&2
		echo >&2 "warning: $ext ($module) is already loaded!"
		echo >&2
		continue
	fi

	ini="/usr/local/etc/php/conf.d/docker-php-ext-$ext.ini"
	if ! grep -q "$line" "$ini" 2>/dev/null; then
		echo "$line" >> "$ini"
	fi
done