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If you check the help for :command-completion, there is a line that reads:

-complete=lua       Lua expression

But it does not give further instructions about how to use it, or how to provide a Lua expression. Is it supposed to work like custom,function? Can I inline a Lua expression somehow? Does it do something else?

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Obviously, this means that you can complete a Lua variable name (including variables of "function" type).

Or, if you prefer, "tab" completes from a keys list of a Lua table you are currently referencing (starting from the globals _G table assumed by default).

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    Frankly I'm not sure it's obvious at all. Similar lines like -complete=custom,{func} custom completion, defined via {func} and -complete=var user variables are either not a variable name, or indicate where a variable should be and what it is, etc. The quoted line in the OP is vague at best.
    – D. Ben Knoble
    Jun 13, 2022 at 22:07
  • @D.BenKnoble There are "var" and "expression" that complete in VimScript variables and both var/funcs names respectively. In Lua all functions are variables by definition, so there's only a single completion "lua" instead of two. If you believe there's a need for better explanation in docs, you can propose a PR to Neovim project.
    – Matt
    Jun 14, 2022 at 4:37
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    I see now—I think the misunderstanding you are pointing to in your answer was itself unclear. It seems you mean to say something like "-complete=lua does not offer a way to use lua for completion (see -complete=custom). Instead, it completes the names of lua variables, much like how -complete=var completes vimscript variables."
    – D. Ben Knoble
    Jun 14, 2022 at 13:01
  • @D.BenKnoble I'm probably very bad in explaining in foreign language, as this is exactly what I'm trying to explain for a few days. -complete=lua completes Lua variable names. While custom completion in Lua is as simple as -complete=custom,v:lua.MyLuaCompletionFunc. So there's no need to re-invent custom completion for Lua specifically. What makes people even consider this?
    – Matt
    Jun 14, 2022 at 14:48
  • Like I said, I think I'm following now. I don't know the reason for the OP's confusion, but mine was something like "everyone wants to put everything in Lua [this seems misguided], so having a completion that uses lua specifically might make sense, and this is the only part of the docs that mention it." That said, I don't use NeoVim, so I was also probably led astray by trying to compare the quoted docs with the vim docs :P
    – D. Ben Knoble
    Jun 14, 2022 at 15:50

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