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| # 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 | |
| . $config # source the config file. | |
| fi | |
| done | |
| ### | |
| ### No we process the command line options | |
| ### | |
| while true; do | |
| [ -z "${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. | |