#!/bin/sh

set -e

usage="$0 -o <output_dir> <file>..."

# Parse flags
outdir=""
while getopts "o:" opt; do
	case "$opt" in
		o)
			outdir="${OPTARG%/}";;
		*)
			echo Usage: $usage >&2
			exit 1;;
	esac
done
shift $((OPTIND - 1))
if [ -z "$outdir" ]; then
	echo Usage: $usage >&2
	exit 1
fi

# Transcribe each file
while [ $# -gt 0 ]; do
	in="$1"
	base="${1%.*}"
	out="${outdir}/${base}.srt"
	wip="${outdir}/.${base}.srt.wip" # work-in-progress
	shift

	# Check work-in-progress from previous run
	if [ -e "$wip" ]; then
		echo "Warning: '$out' in-progress; overwriting." >&2
		rm -f "$out" "$wip" # remove partial output and restart from scratch
	fi

	# Transcribe if not done already
	if [ ! -e "$out" ]; then
		touch "$wip"
		echo "'$in' -> '$out'" >&2
		transcribe "$in" >"$out"
		rm "$wip"
	else
		echo "'$out' already exists; skipping." >&2
	fi
done
echo done >&2