Create a CHANGELOG.md from Git history on Github

changelog.sh

#! /bin/sh
# Creates a markdown formatted change log based the git history
set -eu

read -p "Enter your username:" USER > /dev/stderr
read -s -p "Please enter $USER's password:" PASS > /dev/stderr

OWNER=$(git remote show origin|grep "Fetch URL"|sed 's/.*https:...*\/\(.*\)\/\(.*\).git/\1/')
REPO=$(git remote show origin|grep "Fetch URL"|sed 's/.*https:...*\/\(.*\)\/\(.*\).git/\2/')

function pullDesc() {
    PULL_NO=$1
    F=/tmp/$OWNER-$REPO-pulls-$PULL_NO.json
    if [ ! -e $F -o $(grep -c 'API rate limit exceeded' $F) -gt 0 ] ; then
        U=https://$USER:$PASS@api.github.com/repos/$OWNER/$REPO/pulls/$PULL_NO
        curl -fo $F $U --basic
    fi
    cat $F | grep title|sed 's/.*"\(.*\)",/\1/'
}

echo Change Log
echo ===
echo

git log --oneline --grep 'Merge pull request' --grep 'prepare release' | while read L ; do
    if [ $(echo $L | grep -c 'Merge pull request') -eq 1 ] ; then
        PULL_NO=$(echo $L | sed 's/.*#\([^ ]*\).*/\1/')
        echo " * [#$PULL_NO](https://github.com/docker-java/docker-java/pull/$PULL_NO) $(pullDesc $PULL_NO)"
    elif [ $(echo $L | grep -c 'prepare release') -eq 1 ] ; then
        echo
        echo $(echo $L | sed 's/.*prepare release//')
        echo ---
        echo
    fi
done