feat: allow update given package manager

Signed-off-by: Frost Ming <me@frostming.com>

Author: frostming

src/onepm/cli.py

@@ -13,9 +13,15 @@ def parse_args() -> argparse.Namespace:
         "use", help="Use the package manager given by the requirement spec"
     )
     use_cmd.add_argument("spec", help="package manager requirement spec")
-    commands.add_parser(
+    update_cmd = commands.add_parser(
         "update", aliases=["up"], help="Update the package manager used in the project"
     )
+    update_cmd.add_argument(
+        "name",
+        help="The name of package manager",
+        choices=PACKAGE_MANAGERS,
+        nargs=argparse.OPTIONAL,
+    )
     cleanup_cmd = commands.add_parser(
         "cleanup", help="Clean up installations of specified package manager or all"
     )
@@ -50,7 +56,7 @@ def main():
         case "install":
             core.get_package_manager()
         case "update" | "up ":
-            core.update_package_manager()
+            core.update_package_manager(args.name)
         case "use":
             core.use_package_manager(args.spec)
         case "cleanup":

src/onepm/core.py

@@ -211,8 +211,8 @@ def _pip_location(self) -> Path:
             os.replace(wheel, shared_pip)
         return shared_pip / "pip"
 
-    def update_package_manager(self) -> None:
-        pm, requirement = self.detect_package_manager()
+    def update_package_manager(self, name: str | None = None) -> None:
+        pm, requirement = self.detect_package_manager(name)
         self.install_tool(pm.name, requirement)
 
     def use_package_manager(self, spec: str) -> None: