#!/bin/bash
  # Copyright 2016 Hang Lyu
  
  # Licensed udner the Apache License, Version 2.0 (the "Lincense");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #  http://www.apache.org/licenses/LICENSE-2.0
  #
  # THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, EITHER EXPRESS OF IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
  # WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
  # MERCHANTABLITY OR NON-INFRINGEMENT.
  # See the Apache 2 License for the specific language governing permissions and
  # limitations under the License.
  
  # This script exits with status zero if the phone symbols tables are the same
  # except for possible differences in disambiguation symbols (meaning that all
  # symbols except those beginning with a # are mapped to the same values).
  # Otherwise it prints a warning and exits with status 1.
  # For the sake of compatibility with other scripts that did not write the
  # phones.txt to model directories, this script exits silently with status 0
  # if one of the phone symbol tables does not exist.
  
  . utils/parse_options.sh || exit 1;
  
  if [ $# -ne 2 ]; then
    echo "Usage: utils/lang/check_phones_compatible.sh <phones-symbol-table1> <phones-symbol-table2>"
    echo "e.g.: utils/lang/check_phones_compatible.sh data/lang/phones.txt exp/tri3/phones.txt"
    exit 1;
  fi
  
  table_first=$1
  table_second=$2
  
  # check if the files exist or not
  if [ ! -f $table_first ]; then
    if [ ! -f $table_second ]; then
      echo "$0: Error! Both of the two phones-symbol tables are absent."
      echo "Please check your command"
      exit 1;
    else
      # The phones-symbol-table1 is absent. The model directory maybe created by old script.
      # For back compatibility, this script exits silently with status 0.
      exit 0;
    fi
  elif [ ! -f $table_second ]; then
    # The phones-symbol-table2 is absent. The model directory maybe created by old script.
    # For back compatibility, this script exits silently with status 0.
    exit 0;
  fi
  
  # Check if the two tables are the same (except for possible difference in disambiguation symbols).
  if ! cmp -s <(grep -v "^#" $table_first) <(grep -v "^#" $table_second); then
    echo "$0: phone symbol tables $table_first and $table_second are not compatible."
    exit 1;
  fi
  
  exit 0;