Re: [maildropl] backticks: how to put process into background?

[Christian E. <bla...@gm...>]

* Sam Varshavchik on Monday, June 20, 2011 at 09:44:05 -0400
> strace explains what's happening.

grrh, Mac OS X doesn't provide it.

> maildrop's backtick operator captures the output of the
> command, and all processes spawned by the backtick operator
> write to the same pipe on standard output, so maildrop waits
> for the pipe to close, which won't happen until all processes
> terminate.
> 
> Adding >/dev/null to the end fixes it.
> 
> import DISPLAY
> 
> `nohup /bin/sh -c "xterm &" >/dev/null`

Yey! perfect, thank you.

After some shell quote tweaking, my little recipe looks like
this:


# customize X11 viewer (has to accept stdin)
VIEWER="/sw/bin/xv -geometry 100x100 -wait 3 -"
# adjust paths of required programs for speed
SHELL="/bin/sh"
CAT="/bin/cat"
AWK="/usr/bin/awk"
OPENSSL="/usr/bin/openssl"
NOHUP="/usr/bin/nohup"
PRINTF="/usr/bin/printf"
REFORMAIL="/usr/local/bin/reformail"
UNCOMPFACE="/sw/bin/uncompface"
# check if $DISPLAY is non-empty
if ("$DISPLAY")
{
	if (/^Face:\s+(.{16,})/)
	{
		# work around broken headers
		# (re)create lines of width 79, removing all spaces
		# delete potentially appended X-Face (Claws-Mail)
		`$NOHUP $SHELL -c '$PRINTF "%s\n" $MATCH1 | $AWK "{ if (\$1 == \"X-Face:\") exit; OFS = \"\"; \$1 = \$1; line = \$0; do { print substr(line, 0, 79); line = substr(line, 80); } while (length(line)); }" | $OPENSSL base64 -d | $VIEWER &' >/dev/null`
	}
	elsif (/^X-Face:\s+(.{16,})/)
	{
		# pipe it through uncompface
		`$NOHUP $SHELL -c '$PRINTF "%s\n" $MATCH1 | $UNCOMPFACE -X | $VIEWER &' >/dev/null`
	}
        # remove the header for mutt
	xfilter "$REFORMAIL -I'Face:' -I'X-Face:'"
}
to "| $CAT"


Can be used in mutt as:
set display_filter="maildrop ~/.mailfilters/x-face-filter"

Thanks a lot for your help and patience.

c
-- 
\black\trash movie   _SAME  TIME  SAME  PLACE_
	       New York, in the summer of 2001

--->> http://www.blacktrash.org/underdogma/stsp.php