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A comment on Show HN: vim-airline. Parent comment

Re:Show HN: vim-airline by tvon on Sunday July 07, 2013 @05:28PM (#6003580)
You can accomplish something similar with listchars and list:

  set list
  set listchars=tab:»·,trail:·
It will not give you a file-wide warning but it will make tabs stand out (along with trailing whitespace).

Not much help if you actually want tabs, granted.

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Re:Show HN: vim-airline by reaperhulk on Sunday July 07, 2013 @07:36PM (#6004100)
Oddly enough I added listchars data to my vimrc today without even thinking it would be helpful for detecting mixed. This ought to be good enough for now, thanks!
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