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I'm attempting to add some debugging functionality to a small vim plugin that I am working on. I'd like to wrap echo / echom in a way that allows me to turn off output if I want.

I've attempted to do this:

function! s:log(...)
  if (get(g:, 'my_plugin_debug_setting', 0))
    echom a:000
  end
endfunction

:call s:log('Debugging information')

but that just logs the list ['Debugging information'] (which makes sense, since i've just done the equivalent of echo ['foo']).

I've also attempted to use call: :call call('echo', a:000) but this doesn't work because echo is not a function.

Is there a way to do what I want?

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In my lh-vim-lib library plugin I provide a framework for logging (among many other things) .

Unlike other frameworks (like maktaba) I don't try support several modes (error, warning, info, debug). Instead, I can choose to enable logs independently on each autoload plugin. Then, I can chose where the logs go (:messages, quickfix/loclist window, file, nowhere).

Otherwise, you could have used :echom string(a:000), or even join(a:000, ', ') as long as the list only contains strings -- I had to do some recursive voodoo magic to obtain a nice result on any type of variables in my library.

  • Very interesting! It's unfortunate there isn't an easy way, but that's what I've come to expect from VimL :\ – Nick Tomlin Jun 17 '17 at 16:13

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