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I am trying to handle events of nvim using nvim_subscribe() API via RPC. For instance, calling nvim_subscribe('CmdLineEnter').

I am not sure the specification of this API exactly, but I imagine that the notification will be call back to the client when the 'CmdLineEnter' event occurs in nvim. Is my understanding correct?

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I found a solution to subscribe to events.

First monitor the event you want to subscribe with autocmd, and emit the event I defined myself by using rpcnotify(). For instance, define an autocmd in init.vim as below:

autocmd CmdLineEnter * call rpcnotify(0, 'mymethod')

Or define it by nvim_command(above autocmd) via RPC.

Then, after execute nvim_subscribe('mymethod'), nvim notifies mymethod event to the client via RPC whenever CmdLineEnter event happens.

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  • What does nvim_subscribe do in this case / why do you need to invoke it? Shouldn't you just get the notification from rpcnotify without it when the CmdLineEnter autocmd is triggered?
    – Kvass
    Feb 18, 2021 at 4:23
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    I did some digging here. If you rpcnotify a specific channel, subscriptions do not matter. If you rpcnotify with channel 0 (broadcast), only channels that have subscribed to the event will receive it.
    – Kvass
    Feb 18, 2021 at 5:00

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