git_changelog.sh

#!/bin/bash

FORMAT='- %s '
SUFFIX='homolog';

echo "## CHANGELOG"
echo ----------------------

git for-each-ref --sort='*authordate' --format='%(tag)' refs/tags | tac | grep -v '^$' | grep "${SUFFIX}" |  while read TAG ; 
do
    echo -e "\n"
    if [ $NEXT ];then
        echo "### $NEXT  ($(git tag -l --format='%(taggerdate:local)' $TAG))"
        echo Release note: $(git tag -l --format='%(contents)' $TAG)
    else
        echo "### [RC]"
    fi
    GIT_PAGER=cat git log --no-merges --format="${FORMAT}" $TAG..$NEXT 
    NEXT=$TAG
done

FIRST=$(git tag -l | grep ${SUFFIX} | head -1)

echo -e "\n"
echo "### $FIRST  ($(git tag -l --format='%(taggerdate:local)' $FIRST))"
echo Release note: $(git tag -l --format='%(contents)' $FIRST)

GIT_PAGER=cat git log --no-merges --format="${FORMAT}" $FIRST