Plan 9 from Bell Labs’s /usr/web/sources/contrib/nemo/root/sys/src/cmd/mail2fs/Reply

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Distributed under the MIT License.
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#!/bin/rc
#
# Reply to message shown in the Acme window
# where it runs, or to the 1st mail named in
# std. input or compose a new mail otherwise.

rfork e
if(~ $#file 0 && ~ $#winid 0 ){
	echo must run under o/live or acme >[1=2]
	exit fail
}
d=`{pwd}
if(~ $#file 0){
	w = /mnt/acme/$winid
	file = `{cat $w/tag | sed 's/ .*//'}
}

fname=/mail/box/$user/out/Out.$pid

if(! ~ $"file *text){
	file=`{sed 1q | sed 's,(.* )?(20[0-9][0-9][0-9][0-9])/(.?\.?[0-9]*)/text.*,\2/\3/text,'}
	if(! ~ $"file *text){
		file=new
		{
			echo 'To: '
			echo 'Subject: '
			echo
		} > $fname
	}
	if not
		file=`{pwd}^/^$"file
}

switch($file){
case /mail/*/text
	m=`{echo $file | sed 's,/text$,,'}
	upas/fs -p -f $m/raw
	rt=`{cat /mail/fs/mbox/1/replyto}
	f=`{cat /mail/fs/mbox/1/from}
	cc=`{cat /mail/fs/mbox/1/cc}
	if(! ~ $#cc 0)
		cc=`{echo $cc ; echo ; cat /mail/fs/mbox/1/to}
	if not
		cc=`{cat /mail/fs/mbox/1/to}
	attachs=`{for (f in `{ls $m | grep -v '/(text|L.mbox|raw)$'}) { test -d $f || echo $f }}
	{
		if (~ $#rt 0)
			echo To: $f
		if not
			echo To: $rt
		if (! ~ $#cc 0)
			echo Cc: $cc
		grep '^Subject: ' $m/text | sed 1q
		echo Replying: $m/raw
		for(a in $attachs)
			echo Attach: $a
		echo
		q '> ' $m/text 
	} > $fname
	unmount /mail/fs
}
if(test -e /mnt/ui/appl/*ox*/ctl){
	ox=`{ls -d /mnt/ui/appl/*ox*/ctl | sed 1q}
	echo look $fname >$ox
}
if not
	plumb $fname


exit ''

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