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

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Distributed under the MIT License.
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#!/bin/rc
#
# As Send, but on-line and from acme or o/live

rfork ne
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/ .*//'}
}

fn deliver {
	sed '1,/^$/d' $1 > body.$1
	sed '/^$/q' $1 > hdr.$1
	addrs=`{grep -i '^To: ' hdr.$1 | sed 's/^[Tt][Oo]: //'}
	ccs=`{grep -i '^Cc: ' hdr.$1 | sed 's/^[Cc][Cc]: //'}
	atts=`{grep -i '^Attach: ' hdr.$1 | sed 's/^[Aa]ttach: //' }
	incl=`{grep -i '^Include: ' hdr.$1 | sed 's/^[Ii]nclude: //' }
	repl=`{grep -i '^Replying: ' hdr.$1 | sed 's/^[Rr]eplying: //' }
	xaddrs=$addrs
	xccs=$ccs
	if (! ~ $#ccs 0)
		ccs=-C^$ccs
	if (! ~ $#atts 0)
		atts=-a^$atts
	if (! ~ $#incl 0)
		incl=-A^$incl
	if (! ~ $#repl 0){
		if(! test -f $repl && test -f /mail/box/$user/msgs/$repl)
			repl=/mail/box/$user/msgs/$repl
		if(! test -f $repl){
			arepl=`{echo $repl | sed 's,(.*)/([0-9]+)/raw,\1/a.\2/raw,'}
			if(test -f $arepl)
				repl=$arepl
			if(test -f /mail/box/$user/msgs/$arepl)
				repl=/mail/box/$user/msgs/$arepl
		}
		if(! test -f $repl){
			echo orginal message not found >[1=2]
			exit orig
		}
		upas/fs -p -f $repl
		repl=-R/mail/fs/mbox/1
	}
	done=ok
	{
		for(t in $xaddrs)
			echo 'To: '^$"t
		for(t in $xccs)
			echo 'Cc: '^$"t
	} > addrs.$1
	{ cat addrs.$1 ; grep -vi '^(To|Cc|Attach|Include|Replying): ' hdr.$1 ; cat body.$1 } | {
		if(upas/marshal $repl $atts $incl $ccs $addrs >[2] errs.$1){
			rm errs.$1 hdr.$1 body.$1 addrs.$1 $1
		} 
		if not {
			done=failed
			echo spool: upas/marshal $repl $atts $incl $ccs $addrs
			cat errs.$1
			{ cat errs.$1 ; q ': ' hdr.$1 body.$1 } | mail -s'returned mail' $user
			mv $1 Fail.$1
		}
	}
	if (! ~ $#repl 0)
		unmount /mail/fs
	if(~ $done ok)
		status=''
	if not
		status='deliver failed'
}

cd /mail/box/$user/out || { echo no outgoing box >[1=2] ; exit nombox }


if(! ~ $file /mail/box/$user/out/Out.*){
	echo not an outgoing mail file to be posted
	exit nopostfile
}

if(! ~ $#winid 0)
	echo put >$w/ctl

if(! test -e $file){
	echo $file does not exist >[1=2]
	exit noexist
}

if(deliver `{basename $file}){
	~ $#winid 0 || echo del >$w/ctl
}
if not{
	if(test -e /mail/box/$user/log)
		echo `{date} Post delivered $f >>/mail/box/$user/log
}
exit ''

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