Attachment viewing in the background

This makes use of Mutt's internal mailcap handling to inject a script
before deferring to run-mailcap, saving the attachment to a temporary
file, backgrounding the viewer process, and then cleaning up the
temporary stuff after its return. Stdout/stderr are reported using
Awesome's naughty library, so this will not work on other window
managers for now.

text/html files are handled differently to address the issue that
Firefox would return to the shell before the remote process even
accessed the file (https://bugzilla.mozilla.org/show_bug.cgi?id=1482024)

diff --git a/.mutt/bgrun b/.mutt/bgrun
new file mode 100755 (executable)
index 0000000..e0bcd20
--- /dev/null
+++ b/.mutt/bgrun
@@ -0,0 +1,60 @@
+#!/bin/sh
+
+SELF="${0##*/}"
+
+if [ -z "$TMPDIR" ]; then
+  TMPDIR=/tmp
+elif [ -d "${TMPDIR}/volatile" ]; then
+  TMPDIR="${TMPDIR}/volatile"
+fi
+export TMPDIR
+TMPDIR=$(mktemp -dp "$TMPDIR" mutt.XXXXXXXXXX)
+trap "rm -rf '$TMPDIR'" 1 2 3 4 5 6 7 8 10 11 12 13 14 15
+
+BASENAME="${1##*/}"
+TEMPFILE="${TMPDIR}/${BASENAME}"
+
+notify() {
+  if [ -x "$(command -v awesome-client)" ]; then
+    awesome-client <<-_eof
+       local naughty = require("naughty")
+       naughty.notify({ preset = naughty.config.presets.low,
+               title  = "$3",
+               text   = [[stdout:
+               $(sed -e 's,\",\\\",g' "$1")
+               stderr:
+               $(sed -e 's,\",\\\",g' "$2")]]
+               })
+       _eof
+  fi
+}
+
+case "$SELF" in
+  (bgrun)
+    # make a copy of the file, then launch a shell process in the background
+    # to divert to run-mailcap, after which the temporary directory gets
+    # cleaned up.
+    cp -a "$1" $TMPDIR
+    MIMETYPE="$2"
+    (
+      run-mailcap --action=view "$MIMETYPE":"$TEMPFILE"
+      rm -rf "$TMPDIR"
+      if [ -s "$TMPDIR/output.stdout" ] || [ -s "$TMPDIR/output.stderr" ]; then
+        notify $TMPDIR/output.stdout $TMPDIR/output.stderr \
+          "Output from mutt/$SELF on $BASENAME"
+      fi
+    ) &
+    trap - 1 2 3 4 5 6 7 8 10 11 12 13 14 15
+    ;;
+  (browserrun)
+    # hack to stay around until the browser has read the file: make a fifo and
+    # wait for the cat process to finish writing to it, which means that it
+    # must have been consumed on the other end.
+    mkfifo "$TEMPFILE"
+    INPUTFILE="$1"
+    cat "$INPUTFILE" > $TEMPFILE &
+    sensible-browser "$TEMPFILE" > $TMPDIR/output.stdout 2> $TMPDIR/output.stderr
+    wait
+    ;;
+esac
+

diff --git a/.mutt/browserrun b/.mutt/browserrun
new file mode 120000 (symlink)
index 0000000..b07e7aa
--- /dev/null
+++ b/.mutt/browserrun
@@ -0,0 +1 @@
+bgrun
\ No newline at end of file

diff --git a/.mutt/mailcap.backgrounding b/.mutt/mailcap.backgrounding
new file mode 100644 (file)
index 0000000..37b57ed
--- /dev/null
+++ b/.mutt/mailcap.backgrounding
@@ -0,0 +1,6 @@
+#
+# Mutt mailcap for backgrounding 
+
+text/html; ~/.mutt/browserrun %s; description=Open file in browser via FIFO
+application/*; ~/.mutt/bgrun %s %t; description=Backgrounded run of run-mailcap
+image/*; ~/.mutt/bgrun %s %t; description=Backgrounded run of run-mailcap

diff --git a/.mutt/muttrc b/.mutt/muttrc
index 9315ab13b55e7e4a96d52302232c2cbbb166381e..4281b4bd19e5dfb3c20f9ceaa9d0970f0e6f6c1c 100644 (file)
--- a/.mutt/muttrc
+++ b/.mutt/muttrc
@@ -1552,6 +1552,7 @@ set include=yes
 # This variable specifies which files to consult when attempting to
 # display MIME bodies not directly supported by Mutt.
 # 
+set mailcap_path="$my_confdir/mailcap.backgrounding"
 # 
 # set mailcap_sanitize=yes
 #