#!/bin/sh
# 
# talkwith -- switches speakup synthesizers on the fly
# 
# Copyright (c) 2009 by  the Speakup Team
# Copyright (c) 2008, 2009 by  Charles Hallenbeck
# 
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 2 of the License, or
#  (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Requirements: Linux speakup 3.1.0 or later
#
# To install, copy this script to a directory on the execution path
# e.g. /usr/sbin, or /usr/local/sbin.
# This script should be run as root.

# be sure we are root
if [ $(id -ru) -gt "0" ]; then
	echo "$(basename $0) must be run as root."
	exit
fi

# Define some variables
SPEAKUPDIR="/sys/accessibility/speakup"

# make sure speakup is loaded
if [ ! -d $SPEAKUPDIR ]; then
	echo "Speakup does not seem to be installed."
	exit
fi

# Check the command line for options

if [ "$1" = "" ]; then
	echo
	echo "Usage: $(basename $0) <synth> <daemon> [options]"
	echo
	echo "synth - any synthesizer supported by speakup"
	echo
	echo "daemon - for the 'soft' synthesizer, this should be either"
	echo "spd for speechd-up, or espeakup to run espeakup."
	echo "For the other synthesizers, this is ignored."
	echo
	echo "options - for a software synthesizer, the rest of the command line"
	echo "is passed on to the daemon; otherwise it is ignored."
	echo
	echo "Talkwith does not install or remove modules, so make sure any"
	echo "required driver modules are installed or built into the kernel"
	echo "before running talkwith."
	echo
	exit
fi
 
NEWMOD=$1
shift

# for backward compatibility
if [ "$NEWMOD" = "spd"  -o "$NEWMOD" = "espeakup" ]; then
	DAEMON=$NEWMOD
	NEWMOD=soft
fi

if [ "$NEWMOD" = "soft" ]; then
	if which espeakup > /dev/null 2>&1 ; then
		HAVE_ESPEAKUP=1
	fi
	if which speechd-up > /dev/null 2>&1 ; then
		HAVE_SPD=1
	fi
			
	if [ -z "$HAVE_ESPEAKUP"  -a -z "$HAVE_SPD" ]; then
		echo "no software speech synthesizers are installed."
		exit
	fi
			
	if [ -z "$DAEMON" ]; then
		DAEMON=$1
		shift
	fi

	if [ -z "$DAEMON" -a ! -z "$HAVE_ESPEAKUP" ]; then
		DAEMON="espeakup"
	elif [ -z "$DAEMON" -a ! -z "$HAVE_SPD" ]; then
		DAEMON="spd"
	fi
	
	if [ "$DAEMON" = "espeakup" -a -z "$HAVE_ESPEAKUP" ]; then
		echo "espeakup does not appear to be available."
		exit
	elif [ "$DAEMON" = "spd" -a -z "$HAVE_SPD" ]; then
		echo "speechd-up does not appear to be available."
		exit
	fi
fi

OLDMOD="$(cat $SPEAKUPDIR/synth)"
echo "$NEWMOD" > $SPEAKUPDIR/synth 2> /dev/null
if [ $? != 0 ]; then
	echo "Unable to switch to the $NEWMOD synthesizer."
	echo "This means that the driver is not built in, the module"
	echo "is not loaded, or $NEWMOD is not a valid synthesizer."
	exit 1
fi

if [ "$OLDMOD" = "soft" ]; then
	if [ -f /var/run/espeakup.pid ]; then
		kill $(cat /var/run/espeakup.pid) 2> /dev/null
		if [ -f /var/run/espeakup.pid ]; then
			rm -f /var/run/espeakup.pid
		fi
	fi
	if [ -f /var/run/speechd-up.pid ]; then
		kill $(cat /var/run/speechd-up.pid) 2> /dev/null
		if [ -f /var/run/speechd-up.pid ]; then
			rm -f /var/run/speechd-up.pid
		fi
	fi
	sleep 2
fi

if [ "$NEWMOD" = "none" ]; then
	exit
elif [ "$NEWMOD" = "soft" ]; then
	if [ "$DAEMON" = "espeakup" ]; then
		espeakup $*
	elif [ "$DAEMON" = "spd" ]; then
		nice -n 5 speechd-up $*
	fi
fi