Exec

#!/bin/sh

set -e

if [ "$1" = "-h" ] && [ "$2" = "" ]; then
	p=`basename $0`
	s=`echo "$p" | sed 's/./ /g'`
	cat <<EOF
NAME
	$p

SYNOPSYS
	$p [-h]
	$p [-t [-a|id|pattern]] [-e [-a|id|pattern]]<cmd>
	$s [-o [-a|id|pattern]] [-p outp] [-q errp] [-r both] <cmd>

DESCRIPTION
	$p runs a command, sending stdout/stderr to acme buffers,
	defaulting to +Buffer.

	The buffers are automatically cleaned before hand.

	-t selects stdout buffer, forwarding [-a|id|pattern] to Getids
	-t selects stderr buffer, forwarding [-a|id|pattern] to Getids

	-o is a shortcut to set both -t and -e.

	-p and -q allows to pipe stdout/stderr through the given shell
	commands, before forwarding the result to To, which will be in
	charge of writing the content to an acme(1) buffer.

	-r allows to set both outp and errp at once.

EOF
	exit 0
fi

outp=cat
errp=cat

while getopts "t:e:o:p:q:r:" opt; do
	case "$opt" in
	t) to=$OPTARG ;;
	e) err=$OPTARG ;;
	o) to=$OPTARG; err=$OPTARG ;;
	p) outp="$OPTARG" ;;
	q) errp="$OPTARG" ;;
	r) outp="$OPTARG"; errp="$OPTARG" ;;
	esac
done

shift $((OPTIND-1))

if [ -z "$to" ];  then to=-a;  fi
if [ -z "$err" ]; then err=-a; fi

if [ -z "$1" ]; then
	echo "Exec [-t stdout] [-e stderr] [-o both] [-p outp] [-q errp] [-r both] <command>" | To $err
	exit 1
fi

# Having two To on the same buffer would mess things up
# because To clean window beforehand.
#
# We're comparing pointers, but good enough in practice.
if [ "$err" = "$to" ]; then
	{
		{
			eval "$*" </dev/stdin 2>&3 | eval "$outp"
		} 3>&1 | eval "$errp"
	} | To -c $to
else
	{
		eval "$*" </dev/stdin 2>&3 | eval "$outp" | To -c $to
	} 3>&1 | eval "$errp" | To -c $err
fi