#!/bin/bash

set -e
shopt -s extglob

PROGNAME=${0##*/}

# The following extglob matches all non-binary, non-debian-directory files known
# at the time of packaging.
FILES=!(*.cmd|*.dct|*.dsk|*.hex|*.tgz|debian)

DEBIAN_DIR=debian
COPYRIGHT=$DEBIAN_DIR/copyright
INFO_EXPECTED=$DEBIAN_DIR/copyright-info.expected
INFO_ACTUAL=$DEBIAN_DIR/copyright-info.actual
NO_INFO_EXPECTED=$DEBIAN_DIR/no-copyright-info.expected
NO_INFO_ACTUAL=$DEBIAN_DIR/no-copyright-info.actual

# Some generated files have no copyright info.
NO_INFO_GENERATED=+(cpmutil|dskspec).txt

if ! [ -d $DEBIAN_DIR ]; then
    echo "$PROGNAME: fatal error: no \"$DEBIAN_DIR\" directory found; run" \
        "this script from the top of the upstream source tree, as packaged" \
        "for Debian" >&2
    exit 1
fi

{
    grep -n Copyright $FILES;

    for PATTERN in \
        'Permission is granted to any individual or institution to use, copy,' \
        'or redistribute this software, provided this copyright notice is retained.' \
        'This software is provided "as is" without any expressed or implied' \
        'warranty.  If this software brings on any sort of damage -- physical,' \
        'monetary, emotional, or brain -- too bad.  You'"'"'ve got no one to blame' \
        'but yourself.' \
        'The software may be modified for your own purposes, but modified versions' \
        'must retain this notice.' \
        'This software may be copied, modified, and used for any' \
        'without fee, provided that (1) the above copyright notice is' \
        'retained, and (2) modified versions are clearly marked as having' \
        'purpose without fee, provided that (1) the above copyright' \
        'notice is retained, and (2) modified versions are clearly' \
        'the date included.'; do
        grep -Fn "$PATTERN" $FILES;
    done;

} | sort --field-separator=: --key=1,1 --key=2n,2n > $INFO_ACTUAL

grep -FLi copyright $FILES > $NO_INFO_ACTUAL

if ! [ -r $INFO_EXPECTED ]; then
    echo "$PROGNAME: warning: \"$INFO_EXPECTED\" does not exist or is not" \
        "readable; if \"$INFO_ACTUAL\" exists and is sane, move it to" \
        "\"$INFO_EXPECTED\", and ensure that \"$COPYRIGHT\" is correct" >&2
    exit 2
fi

if ! cmp --silent $INFO_EXPECTED $INFO_ACTUAL; then
    echo "$PROGNAME: error: \"$INFO_EXPECTED\" and \"$INFO_ACTUAL\" differ;" \
        "check \"$INFO_ACTUAL\" for sanity, and update \"$INFO_EXPECTED\" and" \
        "\"$COPYRIGHT\" as necessary" >&2
    exit 3
fi

# We could proceed with the no-copyright-info checks even if the copyright-info
# checks fail, but I am lazy.

# If this extglob match does NOT expand to its literal self, files match.
if [[ $(echo $NO_INFO_GENERATED) != "$NO_INFO_GENERATED" ]]; then
    echo "$PROGNAME: error: generated files" $NO_INFO_GENERATED "exist; clean" \
         "the source tree and try again" >&2
    exit 4
fi

if ! [ -r $NO_INFO_EXPECTED ]; then
    echo "$PROGNAME: warning: \"$NO_INFO_EXPECTED\" does not exist or is not" \
        "readable; if \"$NO_INFO_ACTUAL\" exists and is sane, move it to" \
        "\"$NO_INFO_EXPECTED\", and ensure that \"$COPYRIGHT\" is correct" >&2
    exit 5
fi

if ! cmp --silent $NO_INFO_EXPECTED $NO_INFO_ACTUAL; then
    echo "$PROGNAME: error: \"$NO_INFO_EXPECTED\" and \"$NO_INFO_ACTUAL\"" \
        "differ; check \"$NO_INFO_ACTUAL\" for sanity, and update" \
        "\"$NO_INFO_EXPECTED\" and \"$COPYRIGHT\" as necessary" >&2
    exit 6
fi

exit 0

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