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refactor: use nvim_set_hl to speed up startup time #76

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refactor: use nvim_set_hl to speed up startup time #76

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Commits on Oct 2, 2022

  1. refactor: use nvim_set_hl to speed up startup time 

    On my machine, prior to this change, the colorscheme adds about 8ms to
the startup time of neovim. Using the newly introduced API
`nvim_set_hl`, it’s a little under 3ms, so that’s more than a two times
speedup!

Special care is taken to handle the `fmt` argument, as that’s the least
friendly to `nvim_set_hl`.

This change strives to be backward compatible. Once neovim version 0.7.0
will be widely spread enough, further performance gain are within reach
by:
* removing the fallback that calls `string.format`
* defining the `group_settings` so that those can be passed to `nvim_set_hl` directly
    @cljoly
    cljoly committed Oct 2, 2022
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  2. fixup! refactor: use nvim_set_hl to speed up startup time

    @cljoly
    cljoly committed Oct 2, 2022
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