#!/bin/bash
  #
  # Copyright  2014 Nickolay V. Shmyrev
  # Apache 2.0
  
  if [ -f path.sh ]; then . path.sh; fi
  
  
  small_arpa_lm=data/local/local_lm/data/arpa/4gram_small.arpa.gz
  big_arpa_lm=data/local/local_lm/data/arpa/4gram_big.arpa.gz
  
  for f in $small_arpa_lm $big_arpa_lm data/lang_nosp/words.txt; do
    [ ! -f $f ] && echo "$0: expected file $f to exist" && exit 1
  done
  
  
  set -e
  
  if [ -f data/lang_nosp/G.fst ] && [ data/lang_nosp/G.fst -nt $small_arpa_lm ]; then
    echo "$0: not regenerating data/lang_nosp/G.fst as it already exists and "
    echo ".. is newer than the source LM."
  else
    arpa2fst --disambig-symbol=#0 --read-symbol-table=data/lang_nosp/words.txt \
      "gunzip -c $small_arpa_lm|" data/lang_nosp/G.fst
    echo  "$0: Checking how stochastic G is (the first of these numbers should be small):"
    fstisstochastic data/lang_nosp/G.fst || true
    utils/validate_lang.pl --skip-determinization-check data/lang_nosp
  fi
  
  
  
  if [ -f data/lang_nosp_rescore/G.carpa ] && [ data/lang_nosp_rescore/G.carpa -nt $big_arpa_lm ] && \
      [ data/lang_nosp_rescore/G.carpa -nt data/lang_nosp/words.txt ]; then
    echo "$0: not regenerating data/lang_nosp_rescore/ as it seems to already by up to date."
  else
    utils/build_const_arpa_lm.sh $big_arpa_lm data/lang_nosp data/lang_nosp_rescore || exit 1;
  fi
  
  exit 0;