#!/bin/sh
#
# Build a Mercurial RPM in place.
#
# Bryan O'Sullivan <bos@serpentine.com>
#
# Tested on
# - Fedora 10
# - Fedora 11
# - Centos 5.3 (with Fedora EPEL repo for asciidoc)

cd "`dirname $0`/.."
HG="$PWD/hg"
PYTHONPATH="$PWD/mercurial/pure"
export PYTHONPATH

root="`$HG root 2>/dev/null`"
specfile=contrib/mercurial.spec

if [ -z "$root" ]; then
    echo 'You are not inside a Mercurial repository!' 1>&2
    exit 1
fi

if $HG id -i | grep '+$' > /dev/null 2>&1; then
    echo -n "Your local changes will NOT be in the RPM. Continue [y/n] ? "
    read answer
    if echo $answer | grep -iv '^y'; then
        exit
    fi
fi

rpmdir=/tmp/"`basename $root | sed 's/ /_/'`"-rpm # FIXME: Insecure /tmp handling

cd "$root"
rm -rf $rpmdir
mkdir -p $rpmdir/RPMS
$HG clone -u . "$root" $rpmdir/BUILD

if [ ! -f $specfile ]; then
    echo "Cannot find $specfile!" 1>&2
    exit 1
fi

tmpspec=/tmp/`basename "$specfile"`.$$ # FIXME: Insecure /tmp handling
# make setup.py build the version string
python setup.py build_py -c -d .
hgversion=`$HG version | sed -ne 's/.*(version \(.*\))$/\1/p'`

if echo $hgversion | grep -- '-' > /dev/null 2>&1; then
    # nightly build case, version is like 1.3.1+250-20b91f91f9ca
    version=`echo $hgversion | cut -d- -f1`
    release=`echo $hgversion | cut -d- -f2 | sed -e 's/+.*//'`
else
    # official tag, version is like 1.3.1
    version=`echo $hgversion | sed -e 's/+.*//'`
    release='0'
fi
tip=`$HG -q tip`

# Beat up the spec file
sed -e 's,^Source:.*,Source: /dev/null,' \
    -e "s,^Version:.*,Version: $version," \
    -e "s,^Release:.*,Release: $release," \
    -e "s,^%prep.*,Changeset: $tip\n\0," \
    -e 's,^%setup.*,,' \
    $specfile > $tmpspec

cat <<EOF >> $tmpspec
%changelog
* `LANG=en_US date +'%a %b %d %Y'` `$HG showconfig ui.username` $version-$release
- Automatically built via $0

EOF
$HG log \
     --template '* {date|rfc822date} {author}\n- {desc|firstline}\n\n' \
     .hgtags \
  | sed -e 's/^\(\* [MTWFS][a-z][a-z]\), \([0-3][0-9]\) \([A-Z][a-z][a-z]\) /\1 \3 \2 /' \
        -e '/^\* [MTWFS][a-z][a-z] /{s/ [012][0-9]:[0-9][0-9]:[0-9][0-9] [+-][0-9]\{4\}//}' \
   >> $tmpspec

rpmbuild --define "_topdir $rpmdir" -bb $tmpspec
if [ $? = 0 ]; then
    rm -rf $tmpspec $rpmdir/BUILD
    mv $rpmdir/RPMS/*/* $rpmdir && rm -r $rpmdir/RPMS
    echo
    echo "Packages are in $rpmdir:"
    ls -l $rpmdir/*.rpm
fi