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I want to get the range of ex-mode command in Lua(eg 1 and 3 in 1;3d). The range value should be stored as a:firstline and a:lastline in vim, but based on the doc, a is not implemented in the vim table. How can I get them in Lua?

Update

This is the command I am trying to define:

        vim.api.nvim_exec(
            "command! -range " .. opts.ex_mode_cmd .. " <line1>,<line2>lua require('commented').toggle_comment('c')", true)

From this I expect I can get the value of a:firstline and a:lastline inside toggle_comment, but they all returned nil

local function toggle_comment()
  print('check range', vim.firstline, vim.lastline)
end
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    Can you please explain, from what you'd like to get the range? a:firstline and a:lastline are only ever valid from functions, that are define with the range attribute, but is not always readily available. So this only exists for custom vimscript functions. But I suppose that is not what you want here, it cannot be used to get arbitrarily ranges from ex commands like :g or :m
    – Christian Brabandt
    Jun 7, 2021 at 13:49
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    Are you defining a user-command? If so, see :help :command-range and then you can use <line1> and <line2> in the command definition to pass the range to whatever Lua code you call from there...
    – filbranden ♦
    Jun 7, 2021 at 15:24
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    @filbranden Yes I am trying to define a user-command, and I guess it would work by passing <line1> and <line2> to the function. But since my function is not accepting start and end range as parameter originally, I want to avoid this unless I cannot find any other solution.
    – John Winston
    Jun 7, 2021 at 16:06
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    @ChristianBrabandt Sorry for missing that part. I have added the code I am writing back in.
    – John Winston
    Jun 7, 2021 at 16:08
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    It looks like the code you mentioned will work in Vim, at least the documentation mentions vim.firstline and vim.lastline. In NeoVim, the :lua command takes a range, but no idea where it actually stashes it...
    – filbranden ♦
    Jun 7, 2021 at 17:13

1 Answer 1

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This is works for me:

command -range Test lua require('test').test_range(<line1>, <line2>)

function test_range(start, end)
  print(start, end)
end
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