DomT4 · swissbuechi · Oct 27, 2023 · Oct 27, 2023 · Oct 31, 2023 · Nov 11, 2023
diff --git a/README.md b/README.md
@@ -72,6 +72,8 @@ brew autoupdate version:
                                    open a GUI to ask for the password.
                                    Requires https://formulae.brew.sh/formula/pinentry-mac
                                    to be installed.
+      --ac-only                    Only run autoupdate when on AC power.
+                                   Must be passed with `start`.
   -d, --debug                      Display any debugging information.
   -q, --quiet                      Make some output more quiet.
   -v, --verbose                    Make some output more verbose.

diff --git a/cmd/autoupdate.rb b/cmd/autoupdate.rb
@@ -56,7 +56,8 @@ def autoupdate_args
       switch "--sudo",
              description: "If a Cask requires sudo, autoupdate will open a GUI to ask for the password. " \
                           "Requires https://formulae.brew.sh/formula/pinentry-mac to be installed."
-
+      switch "--ac-only",
+             description: "Only run autoupdate when on AC power. Must be passed with `start`."
       named_args SUBCOMMANDS
     end
   end

diff --git a/lib/autoupdate/start.rb b/lib/autoupdate/start.rb
@@ -110,8 +110,20 @@ def start(interval:, args:)
       set_env << "\nexport SUDO_ASKPASS=#{env_sudo}"
     end
 
+    ac_only = if args.ac_only?
+      <<~EOS
+        if [[ $(pmset -g ps | head -1) =~ "Battery Power" ]]; then
+          echo "Not starting autoupdate, because device is running on Battery"
+          exit
+        fi
+      EOS
+    else
+      ""
+    end
+
     script_contents = <<~EOS
       #!/bin/sh
+      #{ac_only.chomp}
       #{set_env}
       /bin/date && #{Autoupdate::Core.brew} #{auto_args}
     EOS