#!python
import os
from subprocess import run


class RequiredPackages:
    def __init__(self, bins):
        self.required = bins
        self.to_be_installed = []
        self.locate()

    def locate(self):
        for bin in self.required:
            if os.path.isfile(bin[1]):
                continue
            else:
                self.to_be_installed.append(bin[0])
        return self.to_be_installed


# Package List

package_list = [["gcc", "/usr/bin/gcc"]]

packages, required_packages = "", RequiredPackages(package_list)
for package in required_packages.to_be_installed:
    packages = packages + package + " "
try:
    ret = run(["sudo", "pacman", "-S", packages[0:-1]])
    print(ret)
except Exception as e:
    ret = run(["pacman", "-S", packages[0:-1]])
    print(ret)