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I am programming go and I want to run gofmt with a shortcut and replace the content of the current source file with the output of gofmt.

I have the following mapping defined in my vimrc: map <C-r> :r ! gofmt %<CR> but this does simply append the output to the current file. Is there a way to override it?

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    As an aside, why don't you use vim-go. It does this already Commented Jul 31, 2017 at 1:59
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    And run goimports instead of gofmt. Commented Jul 31, 2017 at 3:06
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    If you don't want to use vim-go and automate formatting on save, add the following line to the .vimrc file. :autocmd BufWritePost *.go silent ! go fmt % 2>&1 >/dev/null Commented Jul 31, 2017 at 9:28

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You're using the wrong command: :read appends lines to the buffer (with ! {cmd}: from an external command). Instead, you want to filter the current buffer contents through an external command. This is done via :help :range!. The gofmt command reads from stdin when no file is passed (some other commands take a special - argument for that. Ergo:

:nnoremap <C-r> :%! gofmt<CR>

Notes

  • You should use :noremap; it makes the mapping immune to remapping and recursion.
  • I've limited the mapping to normal mode; I don't think is necessary to directly launch this from visual mode or operator-pending mode.
  • As mentioned in the comments, there's probably a plugin that already provides this out of the box.
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5

The gofmt flag -w will overwrite the contents of the file it's fixing

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