#!/usr/bin/env bash
# reset environment variables that could interfere with normal usage
unset GREP_OPTIONS
# put all utility functions here

# make a temporary file
git_extra_mktemp() {
    mktemp -t "$(basename "$0")".XXX
}

#
# check whether current directory is inside a git repository
#

is_git_repo() {
  git rev-parse --show-toplevel > /dev/null 2>&1
  result=$?
  if test $result != 0; then
    >&2 echo 'Not a git repo!'
    exit $result
  fi
}

is_git_repo

# grab first two non-option arguments
for arg in $*; do
    if [ -n "${arg}" ]; then
        test -z "$firstbranch" && firstbranch="${arg}" && continue
        test -z "$secondbranch" && secondbranch="${arg}" && continue
    else
        # add anything else to a passthrough
        passthrough="$passthrough $arg"
    fi
done

test -z "$firstbranch" && echo "at least one branch required" && exit 1

if test -z "$secondbranch"; then
    secondbranch=$firstbranch
    firstbranch=
fi

git log $passthrough $firstbranch...$secondbranch --format="%m %h %s" --left-right
