NBash

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#!/usr/bin/env bash
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PATH="..:$PATH"
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# Load argsparse library.
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. argsparse.sh
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# Beside the 'type', you can control options user-given values by
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# using other methods.
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argsparse_use_option option1 "An enumerated option." value
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# *Instead* of declaring a type for the option, you can declare an
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# array named option_<optionname>_values, which will contain the
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# acceptable values for said option.
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option_option1_values=(only accepting those values)
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# Acceptable values are mentioned in argsparse usage.
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# And, after either type checking of enumerated values checking, you
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# have the possibility to simply define a function named
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# check_value_of_<optionname>. If the function return with value 0, it
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# means the value is correct. Any other value returned by the function
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# would make the value incorrect.
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argsparse_use_option option2 "An always bad option." value
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check_value_of_option2() {
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	# So, this would make all values return an error.
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	false
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}
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# If an option name contains '-' chars...
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argsparse_use_option long-option "An option with a long name." value
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# ... then the array name...
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option_long_option_values=(long option acceptable values)
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# ... and the function name must have '_' in place of '-'.
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check_value_of_long_option() {
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	local value=$1
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	[[ "$value" = long ]]
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}
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# 
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printf -v argsparse_usage_description "%s\n" \
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	"A tutorial script teaching advanced value checking." \
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	"Try command lines such as:" \
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	" $0" \
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	" $0 -h" \
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	" $0 --option1 only" \
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	" $0 --option2 something" \
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	" $0 --long-option only"
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# Command line parsing is done here.
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argsparse_parse_options "$@"
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printf "Options reporting:\n"
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# Simple reporting function.
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argsparse_report
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printf "End of argsparse report.\n\n"
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