#!/usr/bin/env bash

branch_prefix=$(git config --get git-extras.feature.prefix)

if [ -z "$branch_prefix" ]; then
   branch_prefix="feature"
fi

branch_separator=$(git config --get git-extras.feature.separator)

if [ -z "$branch_separator" ]; then
   branch_separator="/"
fi

merge_mode="--no-ff"
finish=false
declare -a argv
while test $# != 0
do
  case $1 in
  -a|--alias )
    if [[ -n $2 ]] && [[ $2 != -- ]]
    then
      shift # shift -a|-alias
      branch_prefix=$1
    else
      echo >&2 "option $1 requires a value"
      exit 1
    fi
    ;;
  -r|--remote )
    if [[ -n $2 ]] && [[ $2 != -- ]]
    then
      remote=$2
      shift
    else
      remote="origin"
    fi
    ;;
  -s|--separator )
    if [[ -n $2 ]] && [[ $2 != -- ]]
    then
      branch_separator=$2
      shift
    else
      echo >&2 "option $1 requires a value"
      exit 1
    fi
    ;;
  --squash )
    merge_mode="--squash"
    ;;
  --from )
    start_point=$2
    shift
    ;;
  -- )
    # terminate argument parsing
    shift
    argv+=("$@")
    break
    ;;
  finish )
    finish=true
    ;;
  * )
    argv+=("$1")
    ;;
  esac
  shift
done

concatargs() {
  str=$(IFS='-'; echo "$*")
  branch="$branch_prefix$branch_separator$str"
}

test -z "${argv[0]}" && echo "$branch_prefix" "<name> required." 1>&2 && exit 1

concatargs "${argv[@]}"

if "${finish}"
then
  git merge ${merge_mode} "$branch" && git delete-branch "$branch"
else
  if [[ -n $remote ]] && [[ -z $start_point ]]
  then
    git create-branch -r "$remote" "$branch"
  fi

  if [[ -z $remote ]] && [[ -z $start_point ]]
  then
    git create-branch "$branch"
  fi

  if [[ -n $remote ]] && [[ -n $start_point ]]
  then
    git create-branch -r "$remote" --from "$start_point" "$branch"
  fi

  if [[ -z $remote ]] && [[ -n $start_point ]]
  then
    git create-branch --from "$start_point" "$branch"
  fi
fi