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module Slop
class Option
DEFAULT_CONFIG = {
help: true,
tail: false,
underscore_flags: true,
required: false,
}
# An Array of flags this option matches.
attr_reader :flags
# A custom description used for the help text.
attr_reader :desc
# A Hash of configuration options.
attr_reader :config
# An Integer count for the total times this option
# has been executed.
attr_reader :count
# A custom proc that yields the option value when
# it's executed.
attr_reader :block
# The end value for this option.
attr_writer :value
def initialize(flags, desc, **config, &block)
@flags = flags
@desc = desc
@config = DEFAULT_CONFIG.merge(config)
@block = block
reset
end
# Reset the option count and value. Used when calling .reset
# on the Parser.
def reset
@value = nil
@count = 0
end
# Since `call()` can be used/overriden in subclasses, this
# method is used to do general tasks like increment count. This
# ensures you don't *have* to call `super` when overriding `call()`.
# It's used in the Parser.
def ensure_call(value)
@count += 1
if value.nil? && expects_argument?
if default_value
@value = default_value
elsif !suppress_errors?
raise Slop::MissingArgument.new("missing argument for #{flag}", flags)
end
else
@value = call(value)
end
block.call(@value) if block.respond_to?(:call)
end
# This method is called immediately when an option is found.
# Override it in sub-classes.
def call(_value)
raise NotImplementedError,
"you must override the `call' method for option #{self.class}"
end
# By default this method does nothing. It's called when all options
# have been parsed and allows you to mutate the `@value` attribute
# according to other options.
def finish(_result)
end
# Override this if this option type does not expect an argument
# (i.e a boolean option type).
def expects_argument?
true
end
# Override this if you want to ignore the return value for an option
# (i.e so Result#to_hash does not include it).
def null?
false
end
# Returns the value for this option. Falls back to the default (or nil).
def value
@value || default_value
end
# Returns the default value for this option (default is nil).
def default_value
config[:default]
end
# Returns true if we should ignore errors that cause exceptions to be raised.
def suppress_errors?
config[:suppress_errors]
end
# Returns true if an exception should be raised when this option isn't supplied.
def required?
config[:required]
end
# Returns all flags joined by a comma. Used by the help string.
def flag
flags.join(", ")
end
# Returns the last key as a symbol. Used in Options.to_hash.
def key
key = config[:key] || flags.last.sub(/\A--?/, '')
key = key.tr '-', '_' if underscore_flags?
key.to_sym
end
# Returns true if this option should be displayed with dashes transformed into underscores.
def underscore_flags?
config[:underscore_flags]
end
# Returns true if this option should be displayed in help text.
def help?
config[:help]
end
# Returns true if this option should be added to the tail of the help text.
def tail?
config[:tail]
end
# Returns 1 if this option should be added to the tail of the help text.
# Used for sorting.
def tail
tail? ? 1 : -1
end
# Returns the help text for this option (flags and description).
def to_s(offset: 0)
"%-#{offset}s %s" % [flag, desc]
end
end
end
|
