#!/bin/bash

# Copyright (c) 2012 Peter Palfrader
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following
# conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.

usage()
{
cat << EOF
usage: $0 -m <MSG>
       $0 [options] [<file>]

OPTIONS:
   -m <MSG>  Use MSG instead of reading input from file/stdin.
   -M        Add a/Include the trailing newline for single-line data.
EOF
}

msg=""
have_msg=0
multi_line=0
while getopts "hm:M" OPTION
do
    case $OPTION in
        h)
            usage
            exit
            ;;
        M)
            multi_line=1
            ;;
        m)
            have_msg=1
            msg="$OPTARG"
            ;;
        *)
            usage >&2
            exit 1
            ;;
    esac
done
shift $(($OPTIND - 1))


img="$(tempfile --suffix .png)"
trap "rm -f '$img'" EXIT


if [ "$have_msg" -eq 0 ]; then
    if [ "$#" -gt 1 ]; then
        usage >&2
        exit 1
    fi

    if [ "$#" -eq 0 ]; then
        stdin="$(tempfile)"
        trap "rm -f '$img' '$stdin'" EXIT
        cat > "$stdin"
        set dummy "$stdin"
        shift
    fi

    fn="$1"; shift
    if [ "$multi_line" = 1 ] || [ "$(cat "$fn" | wc -l)" -gt 1 ] ; then
        qrencode -s 5 -l H -o "$img" < "$fn"
    else
        echo -n $( cat "$fn" ) | qrencode -s 5 -l H -o "$img"
    fi
else
    echo -n "$msg" | qrencode -s 5 -l H -o "$img"
fi

display "$img"

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