#!/bin/sh

# This announce-text script should be run before publishing an announce
# of a new GNU MPFR release or release candidate. It does some checking,
# then it outputs the announce text to stdout. Information messages are
# written to stderr.
#
# Warning! The release name in the announce text may contain accented
# letters. Make sure they are preserved if your locales are not UTF-8
# based. Moreover, you may need to modify the text.
#
# Specific dependencies:
#   GNU Coreutils (sha1sum, sha256sum, date), svn, gpg, unzip, wget.
#
# Usage: announce-text [ <variable_settings> ]
# where arguments can be, for instance:
#   root=<repository_root>
#   vers=<mpfr_version>
#   nopgpsig=1  to disable checking of the PGP signatures.
#   nowebsrv=1  to disable checking of the mpfr.org web server.
#   nogforge=1  to disable checking of the tarballs on InriaForge.
#   nognuftp=1  to disable checking of the tarballs on the GNU FTP.
#
# When it is run from a working copy, setting $root is not necessary.

set -e

tmpdir=$(mktemp -d /tmp/announce-text-XXXXXXXX)
trap 'rm -rf $tmpdir' 0 1 2 15
echo "Temporary directory: $tmpdir" >&2

alias wget="wget --no-config -q"

for i in $@
do
  eval "$i"
done

[ -z "$root" ] && root=$(svn info | sed -n 's/^Repository Root: //p')
echo "Repository root: $root" >&2

cd $tmpdir

#vers=$(svn ls --xml "$root/tags" | xmlstarlet sel -T -t -v \
#  "//entry[not(commit/@revision < //entry/commit/@revision)]/name" -)
[ -z "$vers" ] && vers=$(svn ls -v "$root/tags" | perl -ne \
  'm,^\s*(\d+)\s.*\s(\d+\.\d+\.\d+)/, && $1 > $r and ($r,$v) = ($1,$2);
   END { print $v }')
base=${vers%-rc*}
echo "MPFR version: $vers" >&2
echo "Base version: $base" >&2

if [ $vers = $base ]; then
  # This is a release (not a release candidate).
  tagversfile="$root/tags/$vers/VERSION"
  tagvers=$(svn cat "$tagversfile")
  if [ $vers != "$tagvers" ]; then
    echo "$tagversfile is incorrect or does not exist:" >&2
    echo "got '$tagvers' instead of '$vers'" >&2
    exit 1
  fi
fi

www="$root/misc/www/mpfr-$base"
echo "MPFR $vers www directory: $www" >&2
svn ls "$www" | sort > ls1
cat <<EOF > ls2
index.html
mpfr-$vers.tar.bz2
mpfr-$vers.tar.bz2.asc
mpfr-$vers.tar.gz
mpfr-$vers.tar.gz.asc
mpfr-$vers.tar.xz
mpfr-$vers.tar.xz.asc
mpfr-$vers.zip
mpfr-$vers.zip.asc
mpfr.dvi.gz
mpfr.html
mpfr.pdf
mpfr.ps.gz
EOF

missing=$(diff ls1 ls2 | sed -n 's/^> //p')
if [ -n "$missing" ]; then
  echo "Missing files in the www directory:" $missing >&2
  [ $vers != $base ]
fi

echo "Getting the files from the www directory..." >&2
for i in tar.bz2 tar.gz tar.xz zip
do
  svn cat "$www/mpfr-$vers.$i" > "mpfr-$vers.$i"
done
sha1sum mpfr-$vers.* > sha1sum.out
sha256sum mpfr-$vers.* > sha256sum.out
unzip -jq mpfr-$vers.zip '*/NEWS'

if [ -z "$nopgpsig" ]; then
  echo "Checking the signatures..." >&2
  for i in mpfr-$vers.*
  do
    svn cat "$www/$i.asc" > "$i.asc"
    gpg --verify "$i.asc" >&2
  done
fi

if [ -z "$nowebsrv" ]; then
  echo "Checking the mpfr.org web server..." >&2
  for i in $(cat ls1)
  do
    echo "  [$i]" >&2
    [ -f "$i" ] || svn cat "$www/$i" > "$i"
    wget -O file "https://www.mpfr.org/mpfr-$base/$i"
    cmp file "$i"
    rm file
  done
fi

rm mpfr*

if [ $vers = $base ] && [ -z "$nogforge" ]; then
  echo "Comparing with InriaForge..." >&2
  gforge="https://gforge.inria.fr"
  wget -O files.html "$gforge/frs/?group_id=136"
  for i in \
    $(sed -n "s/.*href=\"\([^\"]*mpfr-$vers\.[^\"]*[^c]\)\">mpfr-.*/\1/p" \
          files.html)
  do
    wget "$gforge$i"
  done
  for i in sha1sum sha256sum
  do
    $i mpfr-$vers.* > sums-gforge
    diff $i.out sums-gforge >&2
  done
  rm mpfr-* sums-gforge
fi

if [ $vers = $base ] && [ -z "$nognuftp" ]; then
  echo "Comparing with GNU FTP (ftp.gnu.org)..." >&2
  for i in tar.bz2 tar.gz tar.xz zip
  do
    wget https://ftp.gnu.org/gnu/mpfr/mpfr-$vers.$i
  done
  for i in sha1sum sha256sum
  do
    $i mpfr-$vers.* > sums-gnu
    diff $i.out sums-gnu >&2
  done
  rm mpfr-* sums-gnu
fi

# Do not use a pipe in order to check the exit status.
#svn cat "$root/tags/$vers/NEWS" > NEWS

sed -n "/^Changes .* to version ${base}:/,/^\$/p" NEWS > Changes
if [ "$(wc -l < Changes)" -lt 3 ]; then
  echo "The Changes file is too small:" >&2
  cat Changes >&2
  exit 1
fi

rname=$(sed -n "/^Changes .* to version ${base%.*}\.0:/,+1 {
    s/.*The \(\".*\"\) release.*/\1/p
  }" NEWS)

pl=${base##*.}
[ $pl -gt 0 ] && rname="$rname, patch level $pl"

if [ $vers = $base ]; then
  cat <<EOF
Subject: Announce: GNU MPFR $vers is released

GNU MPFR $vers ($rname), a C library for
multiple-precision floating-point computations with correct rounding,
is now available for download from the MPFR web site:

  https://www.mpfr.org/mpfr-$vers/

from InriaForge:

  https://gforge.inria.fr/projects/mpfr/

and from the GNU FTP site:

  https://ftp.gnu.org/gnu/mpfr/

Thanks very much to those who sent us bug reports and/or tested the
release candidate.
EOF
else
  rc=${vers#*-rc}
  [ $rc -gt 1 ] && n=" $rc"
  printf "%s\n\n" "Subject: GNU MPFR $base Release Candidate$n"
  if [ $(echo "$base ($rname)" | wc -m) -gt 30 ]; then
    cat <<EOF
The release of GNU MPFR $base ($rname)
is imminent.  Please help to make this release as good as possible
by downloading and testing this release candidate:
EOF
  else
    cat <<EOF
The release of GNU MPFR $base ($rname) is imminent.
Please help to make this release as good as possible by downloading
and testing this release candidate:
EOF
  fi
  cat <<EOF

https://www.mpfr.org/mpfr-$base/mpfr-$vers.tar.xz
https://www.mpfr.org/mpfr-$base/mpfr-$vers.tar.bz2
https://www.mpfr.org/mpfr-$base/mpfr-$vers.tar.gz
https://www.mpfr.org/mpfr-$base/mpfr-$vers.zip
EOF
fi

cat <<EOF

The SHA1 digests:
EOF
cat sha1sum.out
cat <<EOF

The SHA256 digests:
EOF
cat sha256sum.out
cat <<EOF

The signatures:
https://www.mpfr.org/mpfr-$base/mpfr-$vers.tar.xz.asc
https://www.mpfr.org/mpfr-$base/mpfr-$vers.tar.bz2.asc
https://www.mpfr.org/mpfr-$base/mpfr-$vers.tar.gz.asc
https://www.mpfr.org/mpfr-$base/mpfr-$vers.zip.asc

Each tarball is signed by Vincent Lefèvre. This can be verified using
the DSA key ID 980C197698C3739D; this key can be retrieved with:

  gpg --recv-keys 980C197698C3739D

or by downloading it from <https://www.vinc17.net/pgp.html>.
The key fingerprint is:

  07F3 DBBE CC1A 3960 5078  094D 980C 1976 98C3 739D

The signatures can be verified with: gpg --verify <file.asc>
You should check that the key fingerprint matches.

EOF

cat Changes

if [ $vers = $base ]; then
  cat <<EOF
You can send success and failure reports to <mpfr@inria.fr>, and give
us the canonical system name (by running the "./config.guess" script),
the processor and the compiler version, in order to complete the
"Platforms Known to Support MPFR" section of the MPFR $vers web page.

Regards,
EOF
else
  cat <<EOF
Please send success and failure reports with "./config.guess" output
to <mpfr@inria.fr>.

If no problems are found, GNU MPFR $base should be released
around $(date --iso-8601 --date='7 days').

Regards,
EOF
fi