#!/bin/bash
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.
#

REPO_NAME=$(basename $(git config --get remote.origin.url) | cut -d'.' -f1)
git pull --tags origin master &> /dev/null

echo "<h1>$REPO_NAME Changelog</h1>"
# get the latest tag
TAG_START=$(git tag | sort -Vr | head -1)

# check to see if there is a tag start first.
if [ ! -z "${TAG_START}" ]; then
    head_tag_diff=$(git rev-list HEAD ^${TAG_START} |wc -l)
    if  [ $head_tag_diff -eq 0 ]; then
        # HEAD and latest tag intersect. Instead try and find a previous tag and use that as the start diff
        TAG_END=$TAG_START
        TAG_START=$(git tag | sort -Vr | head -2 | sort -V | head -1)
    else
        TAG_END="HEAD"
    fi

    echo "<h2>tag: ${TAG_START} -> ${TAG_END}</h2>"
    git log --pretty=format:"<li> <a href=https://osm.etsi.org/gitweb/?p=osm/$REPO_NAME.git;a=commitdiff;h=%H>%h &bull;</a> %s</li> " --reverse  ${TAG_START}..${TAG_END}
else
    # no tag, just give the full log
    git log --pretty=format:"<li> <a href=https://osm.etsi.org/gitweb/?p=osm/$REPO_NAME.git;a=commitdiff;h=%H>%h &bull;</a> %s</li> " --reverse
fi