#!/bin/bash
# Copyright 2006 by Steinar H. Gunderson
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 (only) of the GNU General Public License
# as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
set -e

PROGNAME=${0##*/}
MODIFIED_CONF_MSG='Default settings modified by devscripts configuration files:'

usage() {
    echo \
"Usage: $PROGNAME
  Generate a diff for an NMU and mail it to the BTS.
  $PROGNAME options:
    --new             Submit a new bug report rather than sending messages
                      to the fixed bugs (default if more than one bug being
                      closed or no bugs being closed)
    --old             Send reports to the bugs which are being closed rather
                      than submit a new bug (default if only one bug being
                      closed)
    --sendmail=SENDMAILCMD
                      Use SENDMAILCMD instead of \"/usr/sbin/sendmail -t\"
    --mutt            Use mutt to mail the message (default)
    --no-mutt         Mail the message directly, don't use mutt
    --from=EMAIL      Use EMAIL address for message to BTS; defaults to
                      value of DEBEMAIL or EMAIL
    --delay=DELAY     Indicate that the NMU has been uploaded to the
                      DELAYED queue, with a delay of DELAY days; defaults
                      to a placeholder value of "XX". If DELAY is 0 then
                      no reference is made to the DELAYED queue.
    --no-delay        Equivalent to \"--delay=0\"
    --no-conf, --noconf
                      Don't read devscripts config files;
                      must be the first option given
    --no-pending, --nopending
                      Don't add the 'pending' tag
    --non-dd, --nondd
                      Mention in the email that you require sponsorship.
    --template=TEMPLATEFILE
                      Use content of TEMPLATEFILE for message.
    --help, -h        Show this help information.
    --version         Show version and copyright information.

$MODIFIED_CONF_MSG"
}

version() {
	cat <<EOF
This is $PROGNAME, from the Debian devscripts package, version ###VERSION###
This code is copyright 2006 by Steinar H. Gunderson, with modifications
copyright 2006 by Julian Gilbey <jdg@debian.org>.
The software may be freely redistributed under the terms and conditions
of the GNU General Public License, version 2.
EOF
}

# Boilerplate: set config variables
DEFAULT_NMUDIFF_DELAY="XX"
DEFAULT_NMUDIFF_MUTT="yes"
DEFAULT_NMUDIFF_NEWREPORT="maybe"
DEFAULT_BTS_SENDMAIL_COMMAND="/usr/sbin/sendmail"
DEFAULT_NMUDIFF_PENDING=" pending"
DEFAULT_MUTT_PRG="mutt"
VARS="NMUDIFF_DELAY NMUDIFF_MUTT NMUDIFF_NEWREPORT BTS_SENDMAIL_COMMAND NMUDIFF_PENDING MUTT_PRG"
# Don't think it's worth including this stuff
# DEFAULT_DEVSCRIPTS_CHECK_DIRNAME_LEVEL=1
# DEFAULT_DEVSCRIPTS_CHECK_DIRNAME_REGEX='PACKAGE(-.+)?'
# VARS="BTS_SENDMAIL_COMMAND DEVSCRIPTS_CHECK_DIRNAME_LEVEL DEVSCRIPTS_CHECK_DIRNAME_REGEX"

if [ "$1" = "--no-conf" -o "$1" = "--noconf" ]; then
    shift
    MODIFIED_CONF_MSG="$MODIFIED_CONF_MSG
  (no configuration files read)"

    # set defaults
    for var in $VARS; do
	eval "$var=\$DEFAULT_$var"
    done
else
    # Run in a subshell for protection against accidental errors
    # in the config files
    eval $(
	set +e
	for var in $VARS; do
	    eval "$var=\$DEFAULT_$var"
	done

	for file in /etc/devscripts.conf ~/.devscripts
	  do
	  [ -r $file ] && . $file
	done

	set | grep -E '^(NMUDIFF|BTS|DEVSCRIPTS)_')

    # check sanity
    case "$BTS_SENDMAIL_COMMAND" in
	"") BTS_SENDMAIL_COMMAND=/usr/sbin/sendmail ;;
	*) ;;
    esac
    if [ "$NMUDIFF_DELAY" = "XX" ]; then
	# Fine
	:
    else
	if ! [ "$NMUDIFF_DELAY" -ge 0 ] 2>/dev/null; then
	    NMUDIFF_DELAY=XX
	fi
    fi
    case "$NMUDIFF_MUTT" in
	yes|no) ;;
	*) NMUDIFF_MUTT=yes ;;
    esac
    case "$NMUDIFF_NEWREPORT" in
	yes|no|maybe) ;;
	*) NMUDIFF_NEWREPORT=maybe ;;
    esac
#    case "$DEVSCRIPTS_CHECK_DIRNAME_LEVEL" in
#	0|1|2) ;;
#	*) DEVSCRIPTS_CHECK_DIRNAME_LEVEL=1 ;;
#    esac

    # set config message
    MODIFIED_CONF=''
    for var in $VARS; do
	eval "if [ \"\$$var\" != \"\$DEFAULT_$var\" ]; then
	    MODIFIED_CONF_MSG=\"\$MODIFIED_CONF_MSG
  $var=\$$var\";
	MODIFIED_CONF=yes;
	fi"
    done

    if [ -z "$MODIFIED_CONF" ]; then
	MODIFIED_CONF_MSG="$MODIFIED_CONF_MSG
  (none)"
    fi
fi

# # synonyms
# CHECK_DIRNAME_LEVEL="$DEVSCRIPTS_CHECK_DIRNAME_LEVEL"
# CHECK_DIRNAME_REGEX="$DEVSCRIPTS_CHECK_DIRNAME_REGEX"

# Need -o option to getopt or else it doesn't work
# Removed: --long check-dirname-level:,check-dirname-regex: \
TEMP=$(getopt -s bash -o "h" \
	--long sendmail:,from:,new,old,mutt,no-mutt,nomutt \
	--long delay:,no-delay,nodelay \
	--long no-conf,noconf \
	--long no-pending,nopending \
	--long non-dd,nondd \
	--long template: \
	--long help,version -n "$PROGNAME" -- "$@") || (usage >&2; exit 1)

eval set -- $TEMP

# Process Parameters
while [ "$1" ]; do
    case $1 in
#     --check-dirname-level)
# 	shift
#         case "$1" in
# 	0|1|2) CHECK_DIRNAME_LEVEL=$1 ;;
# 	*) echo "$PROGNAME: unrecognised --check-dirname-level value (allowed are 0,1,2)" >&2
# 	   exit 1 ;;
#         esac
# 	;;
#     --check-dirname-regex)
# 	shift; 	CHECK_DIRNAME_REGEX="$1" ;;
    --delay)
	shift
	if [ "$1" = "XX" ]; then
	    # Fine
	    NMUDIFF_DELAY="$1"
	else
	    if ! [ "$1" -ge 0 ] 2>/dev/null; then
		NMUDIFF_DELAY=XX
	    else
		NMUDIFF_DELAY="$1"
	    fi
	fi
	;;
    --nodelay|--no-delay)
	NMUDIFF_DELAY=0 ;;
    --nopending|--no-pending)
	NMUDIFF_PENDING="" ;;
    --nondd|--non-dd)
	NMUDIFF_NONDD=yes ;;
    --mutt)
	NMUDIFF_MUTT=yes ;;
    --nomutt|--no-mutt)
	NMUDIFF_MUTT=no ;;
    --new)
	NMUDIFF_NEWREPORT=yes ;;
    --old)
	NMUDIFF_NEWREPORT=no ;;
    --sendmail)
	shift
	case "$1" in
	    "") echo "$PROGNAME: SENDMAIL command cannot be empty, using default" >&2
		;;
	    *) BTS_SENDMAIL_COMMAND="$1" ;;
        esac
        ;;
    --from)
	shift
	FROM="$1"
	;;
    --no-conf|--noconf)
	echo "$PROGNAME: $1 is only acceptable as the first command-line option!" >&2
	exit 1 ;;
    --template)
	shift
	case "$1" in
	    "") echo "$PROGNAME: TEMPLATEFILE cannot be empty, using default" >&2
	    ;;
	    *)	if [ -f "$1" ]; then
		    NMUDIFF_TEMPLATE="$1"
		else
		    echo "$PROGNAME: TEMPLATEFILE must exist, using default" >&2
		fi
	    ;;
	esac
	;;
    --help|-h) usage; exit 0 ;;
    --version) version; exit 0 ;;
    --)	shift; break ;;
    *) echo "$PROGNAME: bug in option parser, sorry!" >&2 ; exit 1 ;;
    esac
    shift
done

# Still going?
if [ $# -gt 0 ]; then
    echo "$PROGNAME takes no non-option arguments;" >&2
    echo "try $PROGNAME --help for usage information" >&2
    exit 1
fi

if [ "$NMUDIFF_MUTT" = yes ]; then
    if command -v mutt > /dev/null; then
        MUTT_PRG=mutt
    elif command -v neomutt > /dev/null; then
        MUTT_PRG=neomutt
    else
        echo "$PROGNAME: can't find mutt, falling back to sendmail instead" >&2
        NMUDIFF_MUTT=no
    fi
fi

if [ "$NMUDIFF_MUTT" = no ]; then
    if [ -z "$FROM" ]; then
	: ${FROMNAME:="$DEBFULLNAME"}
	: ${FROMNAME:="$NAME"}
    fi
    : ${FROM:="$DEBEMAIL"}
    : ${FROM:="$EMAIL"}
    if [ -z "$FROM" ]; then
	echo "$PROGNAME: must set email address either with DEBEMAIL environment variable" >&2
	echo "or EMAIL environment variable or using --from command line option." >&2
	exit 1
    fi
    if [ -n "$FROMNAME" ]; then
	# If $FROM looks like "Name <email@address>" then extract just the address
	if [ "$FROM" = "$(echo "$FROM" | sed -ne '/^\(.*\) *<\(.*\)> *$/p')" ]; then
	    FROM="$(echo "$FROM" | sed -ne 's/^\(.*\) *<\(.*\)> *$/\2/p')"
	fi
	FROM="$FROMNAME <$FROM>"
    fi
fi

if ! [ -f debian/changelog ]; then
    echo "nmudiff: must be run from top of NMU build tree!" >&2
    exit 1
fi

SOURCE=$(dpkg-parsechangelog -SSource)
if [ -z "$SOURCE" ]; then
    echo "nmudiff: could not determine source package name from changelog!" >&2
    exit 1
fi

VERSION=$(dpkg-parsechangelog -SVersion)
if [ -z "$VERSION" ]; then
    echo "nmudiff: could not determine source package version from changelog!" >&2
    exit 1
fi

CLOSES=$(dpkg-parsechangelog -SCloses)

if [ -z "$CLOSES" ]; then
    # no bug reports, so make a new report in any event
    NMUDIFF_NEWREPORT=yes
fi

if [ "$NMUDIFF_NEWREPORT" = "maybe" ]; then
    if $(expr match "$CLOSES" ".* " > /dev/null); then
	# multiple bug reports, so make a new report
	NMUDIFF_NEWREPORT=yes
    else
	NMUDIFF_NEWREPORT=no
    fi
fi

OLDVERSION=$(dpkg-parsechangelog -o1 -c1 -SVersion)
if [ -z "$OLDVERSION" ]; then
    echo "nmudiff: could not determine previous package version from changelog!" >&2
    exit 1
fi

VERSION_NO_EPOCH=$(echo "$VERSION" | sed "s/^[0-9]\+://")
OLDVERSION_NO_EPOCH=$(echo "$OLDVERSION" | sed "s/^[0-9]\+://")

if [ ! -r ../${SOURCE}_${OLDVERSION_NO_EPOCH}.dsc ]; then
    echo "nmudiff: could not read ../${SOURCE}_${OLDVERSION_NO_EPOCH}.dsc" >&2
    exit 1
fi
if [ ! -r ../${SOURCE}_${VERSION_NO_EPOCH}.dsc ]; then
    echo "nmudiff: could not read ../${SOURCE}_${VERSION_NO_EPOCH}.dsc" >&2
    exit 1
fi

ret=0
debdiff ../${SOURCE}_${OLDVERSION_NO_EPOCH}.dsc \
  ../${SOURCE}_${VERSION_NO_EPOCH}.dsc \
  > ../${SOURCE}-${VERSION_NO_EPOCH}-nmu.diff || ret=$?
if [ $ret -ne 0 ] && [ $ret -ne 1 ]; then
    echo "nmudiff: debdiff failed, aborting." >&2
    rm -f ../${SOURCE}-${VERSION_NO_EPOCH}-nmu.diff
    exit 1
fi

TO_ADDRESSES_SENDMAIL=""
TO_ADDRESSES_MUTT=""
BCC_ADDRESS_SENDMAIL=""
BCC_ADDRESS_MUTT=""
TAGS=""
if [ "$NMUDIFF_NEWREPORT" = "yes" ]; then
    TO_ADDRESSES_SENDMAIL="submit@bugs.debian.org"
    TO_ADDRESSES_MUTT="submit@bugs.debian.org"
    TAGS="Package: $SOURCE
Version: $OLDVERSION
Severity: normal
Tags: patch ${NMUDIFF_PENDING}"
else
    for b in $CLOSES; do
	TO_ADDRESSES_SENDMAIL="$TO_ADDRESSES_SENDMAIL,
  $b@bugs.debian.org"
	TO_ADDRESSES_MUTT="$TO_ADDRESSES_MUTT $b@bugs.debian.org"
	if [ "$(bts select bugs:$b tag:patch)" != "$b" ]; then
	    TAGS="$TAGS
Control: tags $b + patch"
    fi
    if [ "$NMUDIFF_DELAY" != "0" ] && [ "$(bts select bugs:$b tag:pending)" != "$b" ] && [ $NMUDIFF_PENDING ]; then
	TAGS="$TAGS
Control: tags $b + pending"
	fi
    done
    TO_ADDRESSES_SENDMAIL=$(echo "$TO_ADDRESSES_SENDMAIL" | tail -n +2)
    if [ "$TAGS" != "" ]; then
        TAGS=$(echo "$TAGS" | tail -n +2)
    fi
fi

TMPNAM="$(mktemp -t "$(basename "$1").XXXXXXXXX")"

if [ "$NMUDIFF_DELAY" = "XX" ] && [ "$NMUDIFF_TEMPLATE" = "" ] && [ "$NMUDIFF_NONDD" != "yes" ]; then
    DELAY_HEADER="
[Replace XX with correct value]"
fi

if [ "$NMUDIFF_TEMPLATE" != "" ]; then
    BODY=$(cat "$NMUDIFF_TEMPLATE")
elif [ "$NMUDIFF_NONDD" = "yes" ]; then
    BODY="$(printf "%s\n\n%s\n%s\n\n%s\n\n%s" \
"Dear maintainer," \
"I've prepared an NMU for $SOURCE (versioned as $VERSION). The diff" \
"is attached to this message." \
"I require a sponsor to have it uploaded." \
"Regards.")"
elif [ "$NMUDIFF_DELAY" = "0" ]; then
    BODY="$(printf "%s\n\n%s\n%s\n\n%s" \
"Dear maintainer," \
"I've prepared an NMU for $SOURCE (versioned as $VERSION). The diff" \
"is attached to this message." \
"Regards.")"
else
    BODY="$(printf "%s\n\n%s\n%s\n%s\n\n%s" \
"Dear maintainer," \
"I've prepared an NMU for $SOURCE (versioned as $VERSION) and" \
"uploaded it to DELAYED/$NMUDIFF_DELAY. Please feel free to tell me if I" \
"should delay it longer." \
"Regards.")"
fi

if [ "$NMUDIFF_MUTT" = no ]; then
    cat <<EOF > "$TMPNAM"
From: $FROM
To: $TO_ADDRESSES_SENDMAIL
Cc:
Bcc: $BCC_ADDRESS_SENDMAIL
Subject: $SOURCE: diff for NMU version $VERSION
Date: $(date -R)
X-NMUDIFF-Version: ###VERSION###

$TAGS
$DELAY_HEADER

$BODY

EOF

    cat ../${SOURCE}-${VERSION_NO_EPOCH}-nmu.diff >> "$TMPNAM"
    sensible-editor "$TMPNAM"
    if [ $? -ne 0 ]; then
	echo "nmudiff: sensible-editor exited with error, aborting." >&2
	rm -f ../${SOURCE}-${VERSION_NO_EPOCH}-nmu.diff "$TMPNAM"
	exit 1
    fi

    while : ; do
	echo -n "Do you want to go ahead and submit the bug report now? (y/n) "
	read response
	case "$response" in
	    y*) break;;
	    n*) echo "OK, then, aborting." >&2
		rm -f ../${SOURCE}-${VERSION_NO_EPOCH}-nmu.diff "$TMPNAM"
		exit 1
		;;
	esac
    done

    case "$BTS_SENDMAIL_COMMAND" in
	/usr/sbin/sendmail*|/usr/sbin/exim*)
	    BTS_SENDMAIL_COMMAND="$BTS_SENDMAIL_COMMAND -t" ;;
	*)  ;;
    esac

    $BTS_SENDMAIL_COMMAND < "$TMPNAM"

else # NMUDIFF_MUTT=yes
    cat <<EOF > "$TMPNAM"
$TAGS
$DELAY_HEADER

$BODY

EOF

    $MUTT_PRG -s "$SOURCE: diff for NMU version $VERSION" -i "$TMPNAM" \
	-e "my_hdr X-NMUDIFF-Version: ###VERSION###" \
	-a ../${SOURCE}-${VERSION_NO_EPOCH}-nmu.diff $BCC_ADDRESS_MUTT \
	-- $TO_ADDRESSES_MUTT

fi

rm -f ../${SOURCE}-${VERSION_NO_EPOCH}-nmu.diff "$TMPNAM"