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func! ShouldReformat()
  return normal :w !elm-format --stdin --validate
endfunc

func! Reformat()
  if ShouldReformat()
    normal gggqG
  endif
endfunc

But return normal is not taken into account, how can I test that ?

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1 Answer 1

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1 
func! ShouldReformat()
  write !elm-format --stdin --validate
  return v:shell_error
endfunc

v:shell_error returns the last shell execution exit code

:help shell_error
v:shell_error   Result of the last shell command.  When non-zero, the last
                shell command had an error.  When zero, there was no problem.
                This only works when the shell returns the error code to Vim.
                The value -1 is often used when the command could not be
                executed.  Read-only.
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  • 2
    You dont need normal here; the bodies of functions are Ex commands. So just write !elm-format … is fine.
    – D. Ben Knoble ♦
    Commented Jan 30, 2022 at 15:02
  • 1
    Then elm had an output, so I guess i'll swap for system()
    – Pierre-Antoine Guillaume
    Commented Jan 30, 2022 at 15:53
  • 1
    Ok, my error was dumb : I used system(..., join(getline(1, '$'), "\n")), and was missing the closing "\n"
    – Pierre-Antoine Guillaume
    Commented Jan 30, 2022 at 16:23

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