#!/bin/sh

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

case "$1" in
  -l|--list)
    version=`git for-each-ref refs/tags --sort=-authordate --format='%(refname)' \
      --count=1 | sed 's/^refs\/tags\///'`
    if test -z "$version"; then
      git log --pretty="format:  * %s"
    else
      git log --pretty="format:  * %s" $version..
    fi
    ;;
  *)
    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
    git-changelog --list >> $tmp
    printf '\n' >> $tmp
    if [ -f $CHANGELOG ]; then cat $CHANGELOG >> $tmp; fi
    mv $tmp $CHANGELOG
    test -n "$EDITOR" && $EDITOR $CHANGELOG
    ;;
esac