#!/bin/bash
#
# Release note HTML generation
#
#   Copyright (C) 2015 Free Software Foundation, Inc.
#
#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   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 <http://www.gnu.org/licenses/>.
##

release-tags() {
  local -i limit="$1"

  git tag -l '[0-9]*' \
    | tac \
    | { test $limit -gt 0 \
          && head -n$limit \
          || cat; }
}

tag-subject() {
  local tag="${1?Missing tag}"

  git tag -n1 -l "$tag" \
    | sed 's/ \+/: /'
}

tag-body() {
  local tag="${1?Missing tag}"

  git cat-file tag "$tag" \
    | awk '/^-----BEGIN PGP SIGNATURE-----$/ { exit; }
           nl>=2 { print; next; }
           /^$/ { nl++; }' \
    | sed 's/&/\&amp\;/g
           s/</\&lt\;/g;
           s/>/\&gt\;/g;'
}

# optional limit
declare -i limit="$1"

for t in $( release-tags "$limit" ); do
  cat <<EOF
<h4>$( tag-subject "$t" )</h4>
<pre>$( tag-body "$t" )</pre>
EOF
done