Replace external deps with homebrew formulae about homebrew-neovim HOT 8 CLOSED

luarocks exists in the homebrew boneyard and it was re/moved here Homebrew/legacy-homebrew#37842 so it looks like any project that uses need to bundle it in the way its done now.

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@equal-l2 Agreed. At some point we will ship lua and the few lua-based dependencies "statically" as part of nvim core--similar to how the VimL runtime files are shipped. Then these homebrew-visible dependencies won't be needed. Update: in neovim/neovim#4411 we don't "inline" lua, we still require lua or luajit as dependencies.

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luajit can't build neovim-bundled luarocks

We can remove luarocks dep.

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@justinmk
I'm afraid it's not true.
If you remove luarocks, neovim install script cannot find lua, complaining
The 'lpeg' lua package is required for building Neovim.

from homebrew-neovim.

Ah, right.

from homebrew-neovim.

Building bundled luarocks with homebrew luajit needs a patch so that configure can find luajit's lua.h correctly.

In detail, we need pass --with-lua-include=`brew --prefix luajit`/include/luajit-2.0 to luarocks' configure.

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Maybe we should go with current method with these 3 deps, instead of making difficult workarounds.

Homebrew seems not to work well with luajit.

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Then we will wait until the time comes.

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