Enum ArgSettings 

pub enum ArgSettings {
    Required,
    MultipleValues,
    MultipleOccurrences,
    AllowEmptyValues,
    Hidden,
    TakesValue,
    UseValueDelimiter,
    NextLineHelp,
    RequireDelimiter,
    HidePossibleValues,
    AllowHyphenValues,
    RequireEquals,
    Last,
    HideDefaultValue,
    IgnoreCase,
    HideEnvValues,
    HiddenShortHelp,
    HiddenLongHelp,
    // some variants omitted
}

Various settings that apply to arguments and may be set, unset, and checked via getter/setter methods Arg::setting, Arg::unset_setting, and Arg::is_set. This is what the Arg methods which accept a bool use internally.

Variants

Required

Specifies that an arg must be used

MultipleValues

Allows an arg to accept multiple values

MultipleOccurrences

Allows an arg to appear multiple times

AllowEmptyValues

Allows an arg accept empty values such as ""

Hidden

Hides an arg from the help message

TakesValue

Allows an argument to take a value (such as --option value)

UseValueDelimiter

Enables a delimiter to break up arguments --option val1,val2,val3 becomes three values (val1, val2, and val3) instead of the default one (val1,val2,val3)

NextLineHelp

Tells an arg to display it’s help on the line below the arg itself in the help message

RequireDelimiter

Says that arg must use a delimiter to separate values

HidePossibleValues

Hides the possible values from the help message

AllowHyphenValues

Allows values that start with a hyphen

RequireEquals

Requires that an equals be used to provide a value to an option such as --option=value

Last

Says that a positional arg will be the last positional, and reuqires -- to be accessed. It can also be accessed early (i.e. before other positionals) by providing --

HideDefaultValue

Hides the default value from the help message

IgnoreCase

Possible values become case insensitive

HideEnvValues

Hides any values currently assigned to ENV variables in the help message (good for sensitive information)

HiddenShortHelp

The argument should not be shown in short help text

HiddenLongHelp

The argument should not be shown in long help text

Trait Implementations

impl Clone for ArgSettings

fn clone(&self) -> ArgSettings

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ArgSettings

impl Debug for ArgSettings

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl FromStr for ArgSettings

type Err = String

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, <Self as FromStr>::Err>

Parses a string s to return a value of this type.

impl PartialEq for ArgSettings

fn eq(&self, other: &ArgSettings) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for ArgSettings