TITLE: Fetching mail with offlineimap within Mutt
DATE: 2019-06-25
AUTHOR: John L. Godlee
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I wanted to be able to press a key in mutt which would run 
offlineimap in the background to get new messages, then ask Mutt to 
put them on screen. This line goes in my .muttrc:

    macro index,pager @ "<enter-command>unset 
wait_key<enter><shell-escape>offlineimap -o -u quiet 
&<enter><sync-mailbox>" "Run offlineimap"

It defines a macro which can be run in the index or the pager of 
mutt by pressing the @ key.

First it stops mutt from asking the user to press any key to 
continue once the shell command is finished.

Next it invokes offlineimap in the background (&). Then afterwards 
it syncs mutt with its mailboxes (:sync-mailbox).