git-changelog.sh

#!/bin/sh

CHANGELOG_FILE=CHANGELOG.md
FORMAT=" * [%h](../../commit/%h) - %s"

if test "$CHANGELOG_FILE" != ""; then
  rm -rf $CHANGELOG_FILE
  touch $CHANGELOG_FILE
fi

echo "\nCHANGELOG\n=========\n\n" >> $CHANGELOG_FILE
git for-each-ref --sort='*authordate' --format='%(tag)' refs/tags |gtac |grep -v '^$' | while read TAG ; do
    TAG_DATE=$(git log -1 --pretty=tformat:%cd --date=short $TAG)
    if [ $NEXT ];then
        TAG_DATE=$(git log -1 --pretty=tformat:%cd --date=short $NEXT)
        echo "\n\n#### $NEXT / $TAG_DATE" >> $CHANGELOG_FILE
    else
        echo "#### [Current] / $TAG_DATE" >> $CHANGELOG_FILE
    fi
    GIT_PAGER=cat git log --pretty=format:"$FORMAT" $TAG..$NEXT >> $CHANGELOG_FILE
    NEXT=$TAG
done

FIRST=$(git tag -l | head -1)
TAG_DATE=$(git log -1 --pretty=tformat:%cd --date=short $FIRST)
echo "\n\n#### $FIRST / $TAG_DATE" >> $CHANGELOG_FILE
GIT_PAGER=cat git log --pretty=format:"$FORMAT" $FIRST >> $CHANGELOG_FILE