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| | | #!/usr/bin/env bash |
| | | |
| | | # Copyright 2012 Johns Hopkins University (Author: Daniel Povey); |
| | | # Arnab Ghoshal, Karel Vesely |
| | | |
| | | # Licensed under the Apache License, Version 2.0 (the "License"); |
| | | # 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 OR 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. |
| | | |
| | | |
| | | # Parse command-line options. |
| | | # To be sourced by another script (as in ". parse_options.sh"). |
| | | # Option format is: --option-name arg |
| | | # and shell variable "option_name" gets set to value "arg." |
| | | # The exception is --help, which takes no arguments, but prints the |
| | | # $help_message variable (if defined). |
| | | |
| | | |
| | | ### |
| | | ### The --config file options have lower priority to command line |
| | | ### options, so we need to import them first... |
| | | ### |
| | | |
| | | # Now import all the configs specified by command-line, in left-to-right order |
| | | for ((argpos=1; argpos<$#; argpos++)); do |
| | | if [ "${!argpos}" == "--config" ]; then |
| | | argpos_plus1=$((argpos+1)) |
| | | config=${!argpos_plus1} |
| | | [ ! -r $config ] && echo "$0: missing config '$config'" && exit 1 |
| | | . $config # source the config file. |
| | | fi |
| | | done |
| | | |
| | | |
| | | ### |
| | | ### Now we process the command line options |
| | | ### |
| | | while true; do |
| | | [ -z "${1:-}" ] && break; # break if there are no arguments |
| | | case "$1" in |
| | | # If the enclosing script is called with --help option, print the help |
| | | # message and exit. Scripts should put help messages in $help_message |
| | | --help|-h) if [ -z "$help_message" ]; then echo "No help found." 1>&2; |
| | | else printf "$help_message\n" 1>&2 ; fi; |
| | | exit 0 ;; |
| | | --*=*) echo "$0: options to scripts must be of the form --name value, got '$1'" |
| | | exit 1 ;; |
| | | # If the first command-line argument begins with "--" (e.g. --foo-bar), |
| | | # then work out the variable name as $name, which will equal "foo_bar". |
| | | --*) name=`echo "$1" | sed s/^--// | sed s/-/_/g`; |
| | | # Next we test whether the variable in question is undefned-- if so it's |
| | | # an invalid option and we die. Note: $0 evaluates to the name of the |
| | | # enclosing script. |
| | | # The test [ -z ${foo_bar+xxx} ] will return true if the variable foo_bar |
| | | # is undefined. We then have to wrap this test inside "eval" because |
| | | # foo_bar is itself inside a variable ($name). |
| | | eval '[ -z "${'$name'+xxx}" ]' && echo "$0: invalid option $1" 1>&2 && exit 1; |
| | | |
| | | oldval="`eval echo \\$$name`"; |
| | | # Work out whether we seem to be expecting a Boolean argument. |
| | | if [ "$oldval" == "true" ] || [ "$oldval" == "false" ]; then |
| | | was_bool=true; |
| | | else |
| | | was_bool=false; |
| | | fi |
| | | |
| | | # Set the variable to the right value-- the escaped quotes make it work if |
| | | # the option had spaces, like --cmd "queue.pl -sync y" |
| | | eval $name=\"$2\"; |
| | | |
| | | # Check that Boolean-valued arguments are really Boolean. |
| | | if $was_bool && [[ "$2" != "true" && "$2" != "false" ]]; then |
| | | echo "$0: expected \"true\" or \"false\": $1 $2" 1>&2 |
| | | exit 1; |
| | | fi |
| | | shift 2; |
| | | ;; |
| | | *) break; |
| | | esac |
| | | done |
| | | |
| | | |
| | | # Check for an empty argument to the --cmd option, which can easily occur as a |
| | | # result of scripting errors. |
| | | [ ! -z "${cmd+xxx}" ] && [ -z "$cmd" ] && echo "$0: empty argument to --cmd option" 1>&2 && exit 1; |
| | | |
| | | |
| | | true; # so this script returns exit code 0. |