Custom git-changelog

git-changelog.sh

#!/bin/sh

DATE=`date +'%Y-%m-%d'`
HEAD="\nn.n.n / $DATE \n==================\n\n"

function gcl () {
  version=$(git describe --tags --abbrev=0 $(git rev-list --tags --max-count=1))
  if test -z "$version"; then
    git log --no-merges --pretty="format:  * %s (%an)"
  else
    git log --no-merges --pretty="format:  * %s (%an)" $version..
  fi
}

case "$1" in
  -l|--list)
    gcl
    ;;
  *)
    CHANGELOG=$1
    if test "$CHANGELOG" = ""; then
      CHANGELOG=`ls | egrep 'change|history' -i`
      if test "$CHANGELOG" = ""; then CHANGELOG='History.md'; fi
    fi
    tmp="/tmp/changelog"
    printf "$HEAD" > $tmp
    gcl >> $tmp
    printf '\n' >> $tmp
    if [ -f $CHANGELOG ]; then cat $CHANGELOG >> $tmp; fi
    mv $tmp $CHANGELOG
    test -n "$EDITOR" && $EDITOR $CHANGELOG
    ;;
esac