Lazy load a plugin given a command pattern ?

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Hi,

I migrated from Packer and would like to load the fugitive plugin for all commands that start with G. In packer I only had to define a cmd with a pattern "G*".

As I understand lazy.nvim offers to define lazy load conditions with functions but I can't find anywhere some example, documentation or anything. The specs mention cmd keys etc taking a function but never offer an example or explanation.

    cmd = function(_, command)
      print(vim.inspect(plugin))
      print(vim.inspect(command))
    end,

This is always returning command = {}.

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This is my solution so far if anyone encounters the same issue.

'tpope/vim-fugitive',
    init = function(_)
      vim.api.nvim_create_autocmd('CmdlineLeave', {
        group = vim.api.nvim_create_augroup('lazy_manual', { clear = true }),
        pattern = '*',
        callback = function()
          local cmdline = vim.fn.getcmdline()
          if cmdline:match '^G.*' then
            require('lazy').load { plugins = { 'vim-fugitive' } }
          end
        end,
      })
    end,
    lazy = true,
    ...
  },