#!/bin/bash

MODE=${1-patch}

OLD_VERSION=$(MIX_QUIET=1 mix version.current)
MAJOR_NUM=$(echo "$OLD_VERSION" | awk -F'.' '{print $1}')
MINOR_NUM=$(echo "$OLD_VERSION" | awk -F'.' '{print $2}')
PATCH_NUM=$(echo "$OLD_VERSION" | awk -F'.' '{print $3}')

case "$MODE" in

  "major")
    MAJOR_NUM=$(($MAJOR_NUM + 1))
    MINOR_NUM=0
    PATCH_NUM=0
    ;;

  "minor")
    MINOR_NUM=$(($MINOR_NUM + 1))
    PATCH_NUM=0
    ;;

  "patch")
    PATCH_NUM=$(($PATCH_NUM + 1))
    ;;

  *)
    echo "Unknown mode ($MODE) provided, expected major, minor, or patch (default)"
    exit 0
    ;;
esac

echo "${MAJOR_NUM}.${MINOR_NUM}.${PATCH_NUM}"