#!/bin/bash

LYRICS_FILE=$1

previous_timing=
previous_text=

counter=1

while IFS='' read -r line; do
    if [ -n "$line" ]; then
        timing=`echo "$line" | sed 's/ .*//'`
        text="`echo "$line" | sed 's/^[^ ]* \?//'`"

        if [ -n "$previous_timing" -a -n "$previous_text" ]; then
            echo $counter
            echo "00:$previous_timing --> 00:$timing"
            echo "$previous_text"
            echo

            counter=`expr $counter + 1`
        fi

        previous_timing=$timing
        previous_text="$text"
    fi
done <$LYRICS_FILE

if [ -n "$previous_text" ]; then
    echo $counter
    echo "00:$previous_timing --> 00:$timing"
    echo "$previous_text"
    echo
fi