#!/bin/bash

# author: Karl Voit, shellscript@Karl-Voit.at
# version: v0.1 2003-11
# homepage: http://www.Karl-Voit.at/scripts/

## This script calls 'time abcde; beep'. 'beep' is some external
## command that plays some sound to gain user's attraction.
## If called with a parameter (a number), the script waits, until
## this amount of MBs are free on the harddisk and then starts the
## command above.

## You can call this script in two ways:
##   myabcde -s
##     ... starts a new 'abcde'-session when the current one is finished (serial)
##   myabcde 535
##     ... starts a new 'abcde'-session when 535 MBs are free (any integer number is fine)

# NOTE: this script is a quickhack and you should adopt it to your needs!
# Once again: REQUIRES MODIFYING!
# 2do:
#   * check, if used tools are installed
#   * check, if there is something to check ;-)

HARDDISK=hda4


FILENAME=$(basename $0)

LOCKFILE="/var/lock/lockfile_$FILENAME"

ENDCOMMAND=/usr/bin/apm
ENDCOMMANDFILE="/var/lock/doend_$FILENAME"

RIPPER=cdparanoia
ENCODER=oggenc


## seconds between two attempts (if space-parameter is given)
INTERVAL=60

ENCODERCHECKINTERVAL=15


any ()
{
    /bin/ps xauwww | /bin/grep -v "grep" | /bin/grep -v "xauwww" | /bin/grep -i $1
}


dosay()
{
  echo "$1" | festival --tts &
}


handle_endcommand()
{
    rm $ENDCOMMANDFILE
    $ENDCOMMAND
}


handle_already_locked()
{
    echo "$FILENAME: There is already another instance waiting! Exiting."
    echo "$FILENAME: If this is not the case, delete the file \"$LOCKFILE\" and restart."
    exit 1
}


handle_another_ripper_running()
{
    echo "$FILENAME: There is already a ripper running (CD-drive occupied)! Exiting."
    exit 2
}


aquire_lock_or_exit()
{
    # exit, if locked
    [ -e $LOCKFILE ] && handle_already_locked

    touch $LOCKFILE
}


dowait_NOENCODER()
{
    # aquire lock
    aquire_lock_or_exit

    # to ensure, that the scripts checks, when another abcde-session
    # changes from one file to another (and therefore no encoder is running)
    NUMOFENCODERS1=`any $ENCODER |wc -l`
    sleep $ENCODERCHECKINTERVAL
    NUMOFENCODERS2=`any $ENCODER |wc -l`

    while [ $NUMOFENCODERS1 -gt 0 -o $NUMOFENCODERS2 -gt 0 ]; do

	echo "$FILENAME: There is another encoder currently running ($NUMOFENCODERS1). Will wait until it is finished. ("`date +%Hh%Mm%Ss`")"

	sleep $INTERVAL

	NUMOFENCODERS1=`any $ENCODER |wc -l`
	sleep $ENCODERCHECKINTERVAL
	NUMOFENCODERS2=`any $ENCODER |wc -l`

    done

    echo "$FILENAME: No other encoder running, now starting ...  ("`date +%Hh%Mm%Ss`")"
    beep
    dosay "Please answer the questions, this tool is about to ask!"

    # release lock
    rm $LOCKFILE
}


dowait_MB()
{
    #echo "$FILENAME: (DEBUG) dowait [$1] called."

    # aquire lock
    aquire_lock_or_exit

    FREESPACEKB=`df|grep $HARDDISK|awk '{print $4}'`
    FREESPACEMB=`echo "$FREESPACEKB / 1024" | bc`

    #echo "$FILENAME: (DEBUG) FREESPACEMB=[$FREESPACEMB]"

    while [ $FREESPACEMB -lt $1 ]; do

	#echo "$FILENAME: (DEBUG) loop called; FREESPACEMB=[$FREESPACEMB]"
	SPACEDIFF=`echo "$1 - $FREESPACEMB" |bc`
	echo "$FILENAME: Current free space is $FREESPACEMB MB. Will wait until $SPACEDIFF MB more are free. ("`date +%Hh%Mm%Ss`")"

	sleep $INTERVAL

	FREESPACEKB=`df|grep $HARDDISK|awk '{print $4}'`
	FREESPACEMB=`echo "$FREESPACEKB / 1024" | bc`

    done

    echo "$FILENAME: Current free space is $FREESPACEMB MB. Now starting ...  ("`date +%Hh%Mm%Ss`")"
    beep
    dosay "Please answer the questions, this tool is about to ask!"

    # release lock
    rm $LOCKFILE

}


case "x$1" in
    "x-s")
    dowait_NOENCODER
    ;;
    "x")
    echo "$FILENAME: no parameter detected."
    ;;
    *)
    dowait_MB "$1"
    ;;
esac

#echo "$FILENAME: (DEBUG) doing stuff."

NUMOFRIPPERS=`any  $RIPPER |wc -l`
[ $NUMOFRIPPERS -ne 0  ] && handle_another_ripper_running

time abcde ; beep

abcdestatus

[ -e $ENDCOMMANDFILE ] && handle_endcommand

echo "$FILENAME: done.  ("`date +%Hh%Mm%Ss`")"

#end