Integrate package installation into __main__

src/__main__.py

@@ -1,5 +1,10 @@
 import os
 import sys
 
+from src.packages import install_packages
+
+
 if os.geteuid() != 0:
     sys.exit("Please run this program as root user")
+
+install_packages()

src/packages.py

@@ -1,24 +1,34 @@
+import typing as t
 import yaml
 
 from src.util.package import Package, PackageAlreadyInstalled, InvalidPackage
+from src.util.install import Install
 from src.util import log
 
-with open("packages.yaml") as f:
+
+def obtain_packages() -> t.List[Package]:
+    with open("packages.yaml") as f:
         yaml_file = yaml.safe_load(f)
 
-pacman_packages = yaml_file["pacman"]
-aur_packages = yaml_file["aur"]
-git_packages = yaml_file["git"]
+    pacman_packages = yaml_file["pacman"]
+    aur_packages = yaml_file["aur"]
+    git_packages = yaml_file["git"]
 
-packages = []
-for package in git_packages:
+    packages = []
+    for package in git_packages:
         packages.append(Package(package, git=True))
-for package in pacman_packages:
+    for package in pacman_packages:
         packages.append(Package(package))
-for package in aur_packages:
+    for package in aur_packages:
         packages.append(Package(package, aur=True))
 
-for package in packages:
+    return packages
+
+
+def install_packages() -> None:
+    packages = obtain_packages()
+    Install.upgrade_pacman()
+    for package in packages:
         try:
             log.action(f"Installing {package}")
             package.install()