I've never tried, but this blog post seems to do the right thing:
http://therning.org/magnus/archives/727
On Wed, Aug 4, 2010 at 03:10, prad
i have downloaded data from postgresql into a file my haskell program. i can of course edit this file with say vim.
can i run vim on that file from within haskell and after quiting vim have control returned to my haskell program?
the situation is like calling vim to edit my claws-mail emails instead of using the native editor. after editing, i quit the external editor and am returned to the native editor.
-- In friendship, prad
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-- mac