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I always come across a lot of code wrapped in {}s while reading, and I wondered if there was a way for vi to automatically fold these {}s instead of manually marking them.

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You can try to set this value:

set foldmethod=syntax
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  • I open a file with "vi", and enter "set foldmethod=syntax" which works well. But if I add "set foldmethod=syntax" to the vimrc, it doesn't work.
    – Self-Motivated Wu
    Commented Apr 27, 2021 at 8:14
  • Oh, I thought you're using vim not vi. I don't even have the option 'foldmethod'. Anyway according to the man page of vi, you should put set foldmethod=syntax into your $HOME/.exrc file if you're using vi.
    – TornaxO7
    Commented Apr 27, 2021 at 9:11
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    I don't think OP's issue comes from the fact they are using vi (they probably have aliased 'vi' to 'vim' like in most distributions today). The issue is that if you read :h 'foldmethod' you'll see that this option is local to a window, so setting it up in the .vimrc doesn't affect the other windows. One will need to either use an autocommand (e.g. :h BufReadPost) or a ftplugin :h ftplugin-overrule.
    – statox
    Commented Apr 27, 2021 at 9:19

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