#! /bin/bash
set -e

GREPPRG=${GREPPRG:-grep}

function list_notes {
    echo "Notes"
    echo "****************"
    query="$@"
    if [ "$query" == "" ]; then
        query="."
    fi
    grep -l "$query" -R .
}

function list_tasks {
    echo "Tasks"
    echo "****************"
    scope=$1
    query=""
    case "$scope" in
        all)
            inner_task=" xX"
            query="${@:2}"
            ;;
        'done'|closed|complete)
            inner_task="xX"
            query="${@:2}"
            ;;
        open|incomplete)
            inner_task=" "
            query="${@:2}"
            ;;
        *)
            inner_task=" "
            query="$@"
            ;;
    esac
    query=".*$query"
    grep "^[[:blank:]]*[^[:blank:]-][[:blank:]]*[*]\?[[:blank:]]*\[[$inner_task]\?\]$query" -R . -h
}

function echo_help {
    if [ "$1" == "notes" ]; then
        cat << EOF
usage: md.sh notes [query]

query: regex to search for in notes. [defaults to .*]
    Tags are generally represented as !tagname

EOF

    elif [ "$1" == "tasks" ]; then
        cat << EOF
usage: md.sh tasks [scope] [query]

scope: used to limit to completed or include all tasks
    open|incomplete: include only open or incomplete tasks [default]
    done|closed|complete: include only completed tasks
    all: include all tasks, regardless of status

query: regex to search for in each task. [defaults to .*]
    Tags are generally represented as !tagname

EOF
    else
        cat << EOF
usage: md.sh type [args]

type: the type of markdone object to query
    notes: list or query notes
    tasks: list or query tasks
    help: display this help text or help for a sub command

EOF
    fi
}

function main {
    subcmd=$1
    args=${@:2}

    case "$subcmd" in 
        notes)
            list_notes $args
            ;;
        tasks)
            list_tasks $args
            ;;
        all):
            list_notes $args
            echo ""
            list_tasks $args
            ;;
        help)
            echo_help $args
            ;;
        *)
            echo "Unknown command: $subcmd"
            echo_help $args
            exit 1
            ;;
    esac
}

main $@