How to :retab in vim

Today I was working with a file that used Tabs as indentation. At Monterail two spaces indentation is our convention (the proper one) so I wanted to use :retab to change indentation and… suprisingly it didn’t work.

It took me a while and some wiki reading to finally find (almost) working command:

:set et|retab

The caveat is that it will change all tabs into spaces, so I could write s/\t/ /g as well. Fortunately vim wiki has a better command defined:

# ~/.vimrcVim
:command! -range=% -nargs=0 Tab2Space execute '<line1>,<line2>s#^\t\+#\=repeat(" ", len(submatch(0))*' . &ts . ')'

that converts only leading whitespace.

Please note you should paste it to ~/.vimrc and then call it in file with :Tabs2Space. You can use :set list to show whitespace characters and see that this function definitely works as intended.

If you’re interested in my full .vimrc file you can find it on GitHub

Source: http://vim.wikia.com/wiki/Converting_tabs_to_spaces