Polybar: Update A Module When Told To Update (Polybar-Msg)

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One of the easiest pieces of optimisation to be made to your Polybar is to switch some of your interval based modules over to being modules which update when told to update. In i3blocks this was done through signals but within Polybar this is done through polybar-msg and ipc. Most of the module definition is identical to when defining regular modules including things such as the formatting but the main difference comes when defining how a module should be updated. This could be used for things such as your volume control which will only update when you change your volume or a list of the number of package updates available which updates whenever you query for new updates.

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==========Resources==========
Polybar IPC:
https://github.com/polybar/polybar/wiki/Module:-ipc

Polybar Inter Process Messaging:
https://github.com/polybar/polybar/wiki/Inter-process-messaging

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