#!/bin/sh

#

# Build a Mercurial RPM in place.

#

# Bryan O'Sullivan <bos@serpentine.com>

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

rpmdir=/tmp/"`basename $root | sed 's/ /_/'`"-rpm

cd "$root"

rm -rf $rpmdir

mkdir -p $rpmdir/RPMS

hg clone "$root" $rpmdir/BUILD

if [ ! -f $specfile ]; then

    echo "Cannot find $specfile!" 1>&2

    exit 1

fi

tmpspec=/tmp/`basename "$specfile"`.$$

# Use the most recent tag as the version.

version=`hg tags | perl -e 'while(<STDIN>){if(/^(\d\S+)/){print$1;exit}}'`

# Compute the release number as the difference in revision numbers

# between the tip and the most recent tag.

release=`hg tags | perl -e 'while(<STDIN>){($tag,$id)=/^(\S+)\s+(\d+)/;if($tag eq "tip"){$tip = $id}elsif($tag=~/^\d/){print $tip-$id+1;exit}}'`

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

* `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"

fi