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generalise bgrunning via FIFO
[etc/mutt.git] / .mutt / bgrun
1 #!/bin/sh
2
3 SELF="${0##*/}"
4
5 if [ -z "$TMPDIR" ]; then
6   TMPDIR=/tmp
7 elif [ -d "${TMPDIR}/volatile" ]; then
8   TMPDIR="${TMPDIR}/volatile"
9 fi
10 export TMPDIR
11 TMPDIR=$(mktemp -dp "$TMPDIR" mutt.XXXXXXXXXX)
12 cleanup() { cd / && rm -rf "$TMPDIR"; }
13 trap cleanup 1 2 3 4 5 6 7 8 10 11 12 13 14 15
14
15 cd "$TMPDIR"
16
17 notify() {
18   if [ -x "$(command -v awesome-client)" ]; then
19     awesome-client <<-_eof
20         local naughty = require("naughty")
21         naughty.notify({ preset = naughty.config.presets.low,
22                 title  = "$3",
23                 text   = [[stdout:
24                 $(sed -e 's,\",\\\",g' "$1")
25                 stderr:
26                 $(sed -e 's,\",\\\",g' "$2")]]
27                 })
28         _eof
29   fi
30 }
31
32 guess_extension() {
33   python -c "import mimetypes; print(mimetypes.guess_extension('$1'))"
34 }
35
36 launch_viewer() {
37   run-mailcap --action=view "$1":"$2" > output.stdout 2> output.stderr
38 }
39
40 MIMETYPE="$1"
41 TEMPFILE=$(tempfile -d . -p mutt -s $(guess_extension "$MIMETYPE"))
42
43 case "$SELF" in
44   (bgrun)
45     # make a copy of the file, then launch a shell process in the background
46     # to divert to run-mailcap, after which the temporary directory gets
47     # cleaned up.
48     cat > "$TEMPFILE"
49     (
50     launch_viewer "$MIMETYPE" "$TEMPFILE"
51       if [ -s "$TMPDIR/output.stdout" ] || [ -s "$TMPDIR/output.stderr" ]; then
52         notify $TMPDIR/output.stdout $TMPDIR/output.stderr \
53           "Output from mutt/$SELF on $BASENAME"
54       fi
55       cleanup
56     ) &
57     trap - 1 2 3 4 5 6 7 8 10 11 12 13 14 15
58     ;;
59   (bgrun-fifo)
60     # hack to stay around until the viewer has read the file: make a fifo and
61     # wait for the cat process to finish writing to it, which means that it
62     # must have been consumed on the other end.
63     cat > "$TEMPFILE"
64     FIFO="${TEMPFILE%/*}/fifo-${TEMPFILE##*/}"
65     mkfifo "$FIFO"
66     cat "$TEMPFILE" > "$FIFO" &
67     # For some reason, we do have to write a tempfile and cannot seem to
68     # redirect stdin directly to the fifo, i.e. this does not work instead of
69     # the previous three lines:
70     ## cat > "$FIFO" &
71     launch_viewer "$MIMETYPE" "${FIFO}"
72     wait
73     cleanup
74     ;;
75 esac