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#!/bin/bash

requirements_dir="$(realpath "$(dirname $0)/..")"

usage()
{
    echo "
Usage: req.sh list [options...] <type>

    <type>: req | dml | ass | need

    options:

    -S    lists only unsatisfied requirements
"
}

while getopts ":S" o
do
    case "$o" in
        S)
            unsatisfied=1
            shift 1
            ;;
        *)
            usage
            exit 1
            ;;
    esac
done

type="$1"
id="$2"

if [ "$type" == "" ]
then
    usage
    exit 1
fi

case "$type" in
    req)
        dir="${requirements_dir}/catalogue"
        ;;
    dml)
        dir="${requirements_dir}/data_models"
        ;;
    ass)
        dir="${requirements_dir}/assumptions"
        ;;
    need)
        dir="${requirements_dir}/needs"
        ;;
    *)
        usage
        exit 1
esac

if [ "$unsatisfied" == 1 ]
then
    filenames=(${dir}/${type}-*${id}.md)
    for filename in "${filenames[@]}"
    do
        satisfied="$(cat $filename | grep -E "^Satisfied by:")"
        if [ -z "$satisfied" ]
        then
            echo "$(basename "$filename" | sed "s/.md$//")"
        fi
    done
    exit 0
fi

filenames=(${dir}/${type}-*${id}.md)
for filename in "${filenames[@]}"
do
    echo "$(basename "$filename" | sed "s/.md$//")"
done