Struct SpecDefaultIf 

pub struct SpecDefaultIf {
    pub selector: String,
    pub when: Option<String>,
    pub value: String,
}

A default that applies when another flag is given.

Lives on the target flag, the inverse of SpecRequiresIf: flag "--bin-names" { default_if "--json" "true" } binds true on --bin-names when --json was given. Two arguments are clap’s ArgPredicate::IsPresent; three (default_if "--output" "json" "pretty") are Equals. First match wins. Command-line and environment values on this flag suppress it; a default_if value is a default, not an explicit value, so it does not activate requires_if.

clap 4 has Arg::default_value_if as a setter with no getter, so a spec generated from a clap command never carries this — same hole as SpecFlag::requires.

Fields

selector: String

The other flag that decides whether this default applies ("--json").

when: Option<String>

When set, the selector must have this explicit value (Equals). When None, the selector only has to be present (IsPresent).

value: String

The value to bind on this flag when the condition matches.

Trait Implementations

impl Clone for SpecDefaultIf

fn clone(&self) -> SpecDefaultIf

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SpecDefaultIf

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

Formats the value using the given formatter.

impl Eq for SpecDefaultIf

impl PartialEq for SpecDefaultIf

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for SpecDefaultIf

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for SpecDefaultIf