feat: add version flag

src/caelestia/__init__.py

@@ -1,9 +1,12 @@
 from caelestia.parser import parse_args
+from caelestia.utils.version import print_version
 
 
 def main() -> None:
     parser, args = parse_args()
-    if "cls" in args:
+    if args.version:
+        print_version()
+    elif "cls" in args:
         args.cls(args).run()
     else:
         parser.print_help()

src/caelestia/parser.py

@@ -8,6 +8,7 @@ from caelestia.utils.wallpaper import get_wallpaper
 
 def parse_args() -> (argparse.ArgumentParser, argparse.Namespace):
     parser = argparse.ArgumentParser(prog="caelestia", description="Main control script for the Caelestia dotfiles")
+    parser.add_argument("-v", "--version", action="store_true", help="print the current version")
 
     # Add subcommand parsers
     command_parser = parser.add_subparsers(

src/caelestia/utils/version.py

@@ -0,0 +1,54 @@
+import subprocess
+
+from caelestia.utils.paths import config_dir
+
+
+def print_version() -> None:
+    print("Packages:")
+    pkgs = ["caelestia-shell-git", "caelestia-cli-git", "caelestia-meta"]
+    versions = subprocess.run(["pacman", "-Q", *pkgs], stdout=subprocess.PIPE, text=True).stdout
+
+    for pkg in pkgs:
+        if pkg not in versions:
+            print(f"    {pkg} not installed")
+    print("\n".join(f"    {pkg}" for pkg in versions.splitlines()))
+
+    caelestia_dir = (config_dir / "hypr").resolve().parent
+    print("\nCaelestia:")
+    caelestia_ver = subprocess.check_output(
+        ["git", "--git-dir", caelestia_dir / ".git", "rev-list", "--format=%B", "--max-count=1", "HEAD"], text=True
+    )
+    print("    Last commit:", caelestia_ver.split()[1])
+    print("    Commit message:", *caelestia_ver.splitlines()[1:])
+
+    print("\nQuickshell:")
+    print("   ", subprocess.check_output(["qs", "--version"], text=True).strip())
+
+    local_shell_dir = config_dir / "quickshell/caelestia"
+    if local_shell_dir.exists():
+        print("\nLocal copy of shell found:")
+
+        try:
+            shell_ver = subprocess.check_output(
+                [
+                    "git",
+                    "--git-dir",
+                    local_shell_dir / ".git",
+                    "rev-list",
+                    "--format=%B",
+                    "--max-count=1",
+                    "upstream/main",
+                ],
+                text=True,
+            )
+            print("    Last merged upstream commit:", shell_ver.split()[1])
+            print("    Commit message:", *shell_ver.splitlines()[1:])
+        except subprocess.CalledProcessError:
+            print("    Unable to determine last merged upstream commit.")
+
+        shell_ver = subprocess.check_output(
+            ["git", "--git-dir", local_shell_dir / ".git", "rev-list", "--format=%B", "--max-count=1", "HEAD"],
+            text=True,
+        )
+        print("\n    Last commit:", shell_ver.split()[1])
+        print("    Commit message:", *shell_ver.splitlines()[1:])