Simple completion for options and filenames

suggest change
# The following shell function will be used to generate completions for
# the "nuance_tune" command.
_nuance_tune_opts ()
  local curr_arg prev_arg

  # The "config" option takes a file arg, so get a list of the files in the
  # current dir.  A case statement is probably unnecessary here, but leaves
  # room to customize the parameters for other flags.
  case "$prev_arg" in
      COMPREPLY=( $( /bin/ls -1 ) )
      return 0
    # Use compgen to provide completions for all known options.
    COMPREPLY=( $(compgen -W '-analyze -experiment -generate_groups -compute_thresh -config -output -help -usage -force -lang -grammar_overrides -begin_date -end_date -group -dataset -multiparses -dump_records -no_index -confidencelevel -nrecs -dry_run -rec_scripts_only -save_temp -full_trc -single_session -verbose -ep -unsupervised -write_manifest -remap -noreparse -upload -reference -target -use_only_matching -histogram -stepsize' -- $curr_arg ) );

# The -o parameter tells Bash to process completions as filenames, where applicable.                                                                                                                                                        
complete -o filenames -F _nuance_tune_opts nuance_tune

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