yt2srt

#!/usr/bin/env bash
# yt2srt - Convert YouTube subtitles to .srt

in=$1 out=${in%.txt}.srt

[[ ! -f $in ]] &&
	echo "First argument must be the file with the youtube subtitles" && exit 1
echo "Output file: $out"
[[ -f $out ]] &&
	echo "It will be overwritten unless cancelled" &&
	read -p "Press Ctrl-C to cancel, or Enter to continue " &&
	>"$out"

time=() text=() n=0
while read line
do
	if [[ $line =~ ^[0-5][0-9]:[0-5][0-9]$ ]]
	then
		((n++))
		time+=("$line")
		read line
		text+=("'$line'")
 fi
done <"$in"

for i in ${!text[@]}
do
	end=${time[$i+1]}
	[[ -z $end ]] && end="59:59"
	echo -e "$i\n00:${time[$i]},000 --> 00:$end,000\n${text[$i]}\n" >>"$out"
done

exit 0