mc^2: make <F5> launch your own copy command

custom_f5.lua

--
-- This snippet makes the F5 key launch the external 'cp' command.
--
-- It only does this if the string "mozambique" is somewhere in the
-- folder's path. For all other folders, the builtin F5 will kick in.
--
-- *** See also the 'trash' snippet for a more robust code (it does
-- something similar for F8). ***
--

local function my_own_copy(files, target)
  for _, file in ipairs(files) do
    mc.execute(("cp -v -i %q %q"):format(file, target))
  end
end

ui.Panel.bind('f5', function(pnl)

  --
  -- You can replace the following silly 'mozambique' line with...
  --
  --   if pnl.vdir:last().vfs_prefix == 'uzip' then
  --
  -- ...to operate inside zip archives instead.
  --
  -- Here's a cute idea: you can instead look for the existence of a file
  -- with a special name, say ".acme-project", in the current folder or
  -- ancestor folders to trigger this custom F5.
  --

  if pnl.dir:find 'mozambique' then
    local files = pnl.marked or { pnl.current }
    if prompts.confirm(T"Copy %d files using my own cool technique?":format(#files)) then
      abortive(ui.Panel.other, T"The 'other' panel must display a folder!")
      my_own_copy(files, ui.Panel.other.dir)
    end
  else
    return false  -- By explicitly returning 'false' we fallback to MC's builtin <f5>.
  end

end)