feat: Add --install-main-branch switch

aider/args.py

@@ -503,6 +503,12 @@ def get_parser(default_config_files, git_root):
         help="Check for new aider versions on launch",
         default=True,
     )
+    group.add_argument(
+        "--install-main-branch",
+        action="store_true",
+        help="Install the latest version from the main branch",
+        default=False,
+    )
     group.add_argument(
         "--apply",
         metavar="FILE",

aider/main.py

@@ -430,6 +430,11 @@ def main(argv=None, input=None, output=None, force_git_root=None, return_coder=F
         update_available = check_version(io, just_check=True, verbose=args.verbose)
         return 0 if not update_available else 1
 
+    if args.install_main_branch:
+        from aider.versioncheck import install_from_main_branch
+        success = install_from_main_branch(io)
+        return 0 if success else 1
+
     if args.check_update:
         check_version(io, verbose=args.verbose)
 

aider/versioncheck.py

@@ -16,8 +16,8 @@ def install_from_main_branch(io):
     """
     return utils.check_pip_install_extra(
         io,
-        None
-        "Install the latest version from the main branch?",
+        "aider",
+        "Installing the latest version from the main branch...",
         ["--upgrade", "git+https://github.com/paul-gauthier/aider.git"],
     )