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#!/bin/sh
# DESCRIPTION
# Mutt invokes external attachment viewers by writing the
# attachment to a temporary file, executing the pipeline specified
# for that attachment type in the mailcap file, waiting for the
# pipeline to terminate, writing nulls over the temporary file,
# then deleting it. This causes problems when using graphical
# viewers such as qvpview and acroread to view attachments.
#
# If qvpview, for example, is executed in the foreground, the mutt
# user interface is hung until qvpview exits, so the user can't do
# anything else with mutt until he or she finishes reading the
# attachment and exits qvpview. This is especially annoying when
# a message contains several MS Office attachments--one would like
# to have them all open at once.
#
# If qvpview is executed in the background, it must be given
# enough time to completely read the file before returning control
# to mutt, since mutt will then obliterate the file. Qvpview is
# so slow that this time can exceed 20 seconds, and the bound is
# unknown. So this is again annoying.
#
# The solution provided here is to invoke the specified viewer
# from this script after first copying mutt's temporary file to
# another temporary file. This script can then quickly return
# control to mutt while the viewer can take as much time as it
# needs to read and render the attachment.
#
# EXAMPLE
# To use qvpview to view MS Office attachments from mutt, add the
# following lines to mutt's mailcap file.
#
# application/msword; mutt_bgrun qvpview %s
# application/vnd.ms-excel; mutt_bgrun qvpview %s
# application/vnd.ms-powerpoint; mutt_bgrun qvpview %s
prog=${0##*/}
# Check the arguments first.
if [ "$#" -lt "2" ]; then
echo "usage: $prog viewer [viewer options] file" >&2
exit 1
fi
# Separate the arguments. Assume the first is the viewer, the last is
# the file, and all in between are options to the viewer.
viewer="$1"
shift
while [ "$#" -gt "1" ]; do
options="$options $1"
shift
done
file=$1
# Create a temporary directory for our copy of the temporary file.
#
# This is more secure than creating a temporary file in an existing
# directory.
tmpdir=/tmp/$LOGNAME$$
umask 077
mkdir "$tmpdir" || exit 1
tmpfile="$tmpdir/${file##*/}"
# Copy mutt's temporary file to our temporary directory so that we can
# let mutt overwrite and delete it when we exit.
cp "$file" "$tmpfile"
# Run the viewer in the background and delete the temporary files when done.
(
"$viewer" $options "$tmpfile"
rm -f "$tmpfile"
rmdir "$tmpdir"
) &
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