#! /bin/bash

if [ $# -ne 2 ]; then
    echo "usage: $0 <old version number> <new version number>" >&2
    exit 1
fi

if [ ! -f INSTALL -o ! -f configure -o ! -d lib-src ]; then
    echo "this script should be run in the emacs root directory" >&2
    exit 2
fi

OLD=$1
NEW=$2
outfile=emacs-$NEW.announce
oldtag=EMACS_PRETEST_$(echo $OLD|tr . _)
newtag=EMACS_PRETEST_$(echo $NEW|tr . _)

if [ -f $outfile ]; then
    echo "$outfile exists"
    echo -n "interrupt to abort, ENTER to overwrite "; read answer
fi

echo -n "tag name for OLD emacs version $OLD [$oldtag]: "; read answer
if [ "$answer" ]; then oldtag=$answer; fi

echo -n "tag name for NEW emacs version $NEW [$newtag]: "; read answer
if [ "$answer" ]; then newtag=$answer; fi

exec > $outfile

cat <<EOF

There is a new pretest available in

  <ftp://alpha.gnu.org/gnu/emacs/pretest/emacs-$NEW.tar.gz>

Please report results from compiling and running the pretest to
<emacs-pretest-bug@gnu.org>.  Your feedback is necessary for us
to know on which platforms the pretest has been tried.

If you have the tars from the previous pretest, and you have the
\`xdelta' utility, you can instead download the much smaller

  <ftp://alpha.gnu.org/gnu/emacs/pretest/emacs-$OLD-$NEW.xdelta>

You can use a command like

  $ xdelta patch XDELTA PREVIOUS-TAR CURRENT-TAR

to generate the new tar from the old one, where XDELTA is the xdelta
file you downloaded, PREVIOUS-TAR is the tar file from the previous
pretest, and CURRENT-TAR is the name of the tar file you downloaded.

Information about xdelta can be found on the GNU ftp site, in
/non-gnu/xdelta.README.

Changes since $OLD

EOF

make-changelog-diff $oldtag $newtag

echo " announcement created in $outfile" >&2

# arch-tag: 605e00c7-7330-4c45-81e1-2ed53a13c39f