OmegaT tag insert

#!/bin/bash
##########
# Tag Insert — Version 0.1, 20090517
# By Roberto Bechtlufft
# http://www.bechtranslations.com.br
# Modified by Kos Ivantsov
# http://libretraduko.wordpress.com
##########
# Requires:
# cat, sed, grep, tr, xte, xclip
# zenity (to locate OT installation dir),
# notify-send (to show selected tag)
#
# xte can be substituted with xmacro or xdotool
# xclip can be substituted with xsel or xclipboard
##########

##########
# create a file that contains OT installation directory
# it's used later on to find OT icon for notifications
# if there's no need for icons, this part can be deleted
if [ ! -f $HOME/.omegat/ompath ]; then
    dirname `zenity --file-selection --title="Navigate to OT directory" \
    --text="Select OmegaT.jar from the folder where OmegaT is installed"` \
    > $HOME/.omegat/ompath
fi
OM_PATH=`cat $HOME/.omegat/ompath`
##########

##########
# shows currently selected tag with libnotify popup
function notify {
    notify-send --icon="$OM_PATH/images/OmegaT.png" `cat $currenttag`
}
##########

##########
# checks if OT is running, used later on during invocation of the
# script either to execute, or to exit
function test_omegat () {
    export OTPID=`ps ax|grep OmegaT.jar|grep java|cut -d " " -f 2`
    if [ -z $OTPID ]; then
    echo "NORUN"
    else
    echo "RUN"
    fi
}
##########

##########
# set up some variables and files to store tags at different stages
#
source=$HOME/.omegat/script/source.txt
tagsdir=/tmp/ottags
tags=$tagsdir/tags
tagnumber=$tagsdir/tagnumber
currenttag=$tagsdir/currenttag
pidfile=$tagsdir/pidfile
##########

##########
# Create temp dir for temp files with tags
if [ ! -d $tagsdir ]; then
mkdir -p $tagsdir
fi
##########

##########
# If the script is run without parameters, it checks if another instance
# is already running, and if so, exits, otherwise proceeds
# and then loops in the background
if [ -z $1 ]; then
    if [ -e $pidfile ]; then
    rm $pidfile
    fi
echo $$ > $pidfile
export PID=`cat $pidfile`
test `pgrep taginsert|grep -v $PID|wc -l` -ge 2 && rm $pidfile && exit 0
#
# then it watches (every 2 seconds) if OT's exported source segment
# has changed
# if changed, gather all the tags
# (one on each line with preceding number) into $tags
# set $tagnumber to "1" and set $currenttag to string #1 from $tags
# (without preceding digit(s))
#
old=`stat $source | grep Modify`
while [ i != 0 ]; do
    sleep 2
    [ "$(test_omegat)" = "NORUN" ] && rm -r $tagsdir && exit 0
    new=`stat $source | grep Modify`
    if [ "$old" != "$new" ]; then
        rm -r $tagsdir/*
        old="$new"
        grep -o "<.[^>]*>" $source |grep -n "<" > $tags
        echo "1" > $tagnumber
        grep "^1:" $tags | cut -d ":" -f 2 > $currenttag
    fi
done
fi
##########

##########
# if invoked with parameters, then select prev./next tag
# selection goes in loop, ie next to the last is the first,
# and previous to the first is the last
# Upon changing selection popup notification is brought up,
# showing OT's icon and currently selected tag
# Before inserting current tag, clipboard is stored into a variable,
# and upon inserting the tag, it gets restored.
case $1 in
    previous)
    [ "$(test_omegat)" = "NORUN" ] && rm -r $tagsdir && exit 0
    export numberoftags=`cat $tags|wc -l`
    if [ `cat $tagnumber` -ge 2 ]; then
    expr `cat $tagnumber` - 1 > $tagnumber
    else
    echo $numberoftags > $tagnumber
    fi
    tagnumber=`cat $tagnumber`
    grep "^$tagnumber:" $tags | cut -d ":" -f 2 > $currenttag
    notify
    ;;
    next)
    [ "$(test_omegat)" = "NORUN" ] && rm -r $tagsdir && exit 0
    export numberoftags=`cat $tags|wc -l`
    if [ `cat $tagnumber` -lt ${numberoftags} ]; then
    expr `cat $tagnumber` + 1 > $tagnumber
    else
    echo "1" > $tagnumber
    fi
    tagnumber=`cat $tagnumber`
    grep "^$tagnumber:" $tags | cut -d ":" -f 2 > $currenttag
    notify
    ;;
    insert)
    [ "$(test_omegat)" = "NORUN" ] && rm -r $tagsdir && exit 0
    export PREVCLIP=`xclip -o -selection clipboard`
    cat $currenttag | tr -d '\n' |xclip -i -selection clipboard
    xte "keydown Control_L" "key v" "keyup Control_L"
    sleep 2
    echo "$PREVCLIP"| xclip -i -selection clipboard
    ;;
    *)
    exit 0
    ;;
esac