98 lines
3.6 KiB
Bash
98 lines
3.6 KiB
Bash
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#!/bin/bash
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# Copyright 2012 Johns Hopkins University (Author: Daniel Povey);
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# Arnab Ghoshal, Karel Vesely
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
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# WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
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# MERCHANTABLITY OR NON-INFRINGEMENT.
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# See the Apache 2 License for the specific language governing permissions and
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# limitations under the License.
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# Parse command-line options.
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# To be sourced by another script (as in ". parse_options.sh").
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# Option format is: --option-name arg
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# and shell variable "option_name" gets set to value "arg."
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# The exception is --help, which takes no arguments, but prints the
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# $help_message variable (if defined).
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###
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### The --config file options have lower priority to command line
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### options, so we need to import them first...
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###
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# Now import all the configs specified by command-line, in left-to-right order
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for ((argpos=1; argpos<$#; argpos++)); do
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if [ "${!argpos}" == "--config" ]; then
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argpos_plus1=$((argpos+1))
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config=${!argpos_plus1}
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[ ! -r $config ] && echo "$0: missing config '$config'" && exit 1
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. $config # source the config file.
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fi
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done
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###
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### No we process the command line options
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###
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while true; do
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[ -z "${1:-}" ] && break; # break if there are no arguments
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case "$1" in
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# If the enclosing script is called with --help option, print the help
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# message and exit. Scripts should put help messages in $help_message
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--help|-h) if [ -z "$help_message" ]; then echo "No help found." 1>&2;
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else printf "$help_message\n" 1>&2 ; fi;
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exit 0 ;;
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--*=*) echo "$0: options to scripts must be of the form --name value, got '$1'"
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exit 1 ;;
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# If the first command-line argument begins with "--" (e.g. --foo-bar),
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# then work out the variable name as $name, which will equal "foo_bar".
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--*) name=`echo "$1" | sed s/^--// | sed s/-/_/g`;
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# Next we test whether the variable in question is undefned-- if so it's
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# an invalid option and we die. Note: $0 evaluates to the name of the
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# enclosing script.
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# The test [ -z ${foo_bar+xxx} ] will return true if the variable foo_bar
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# is undefined. We then have to wrap this test inside "eval" because
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# foo_bar is itself inside a variable ($name).
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eval '[ -z "${'$name'+xxx}" ]' && echo "$0: invalid option $1" 1>&2 && exit 1;
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oldval="`eval echo \\$$name`";
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# Work out whether we seem to be expecting a Boolean argument.
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if [ "$oldval" == "true" ] || [ "$oldval" == "false" ]; then
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was_bool=true;
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else
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was_bool=false;
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fi
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# Set the variable to the right value-- the escaped quotes make it work if
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# the option had spaces, like --cmd "queue.pl -sync y"
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eval $name=\"$2\";
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# Check that Boolean-valued arguments are really Boolean.
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if $was_bool && [[ "$2" != "true" && "$2" != "false" ]]; then
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echo "$0: expected \"true\" or \"false\": $1 $2" 1>&2
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exit 1;
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fi
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shift 2;
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;;
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*) break;
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esac
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done
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# Check for an empty argument to the --cmd option, which can easily occur as a
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# result of scripting errors.
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[ ! -z "${cmd+xxx}" ] && [ -z "$cmd" ] && echo "$0: empty argument to --cmd option" 1>&2 && exit 1;
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true; # so this script returns exit code 0.
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