Struct FieldOverride 

pub struct FieldOverride {
    pub path: FieldPath,
    pub value: String,
    pub priority: MergePriority,
}

Several CLI commands accept additional overrides specified directly on the command line. They are represented by this structure.

Fields

path: FieldPath

The field path identifying the (potentially nested) field to override.

value: String

The overriding value.

priority: MergePriority

The priority associated with this override.

Implementations

impl FieldOverride

pub fn parse( cache: &mut CacheHub, assignment: String, priority: MergePriority, ) -> Result<Self, ParseError>

Parse an assignment path.to.field=value to a field override, with the priority given as a separate argument.

Internally, the parser entirely parses the value part to a NickelValue (have it accept anything after the equal sign is in fact harder than actually parsing it), but what we need at this point is just a string. Thus, parse uses the span to extract back the value part of the input string.

Theoretically, this means we parse two times the same string (the value part of an assignment). In practice, we expect this cost to be completely negligible.

Selectors

The value part accepts special selectors starting with a leading @ that aren’t part of the core Nickel syntax. This list is subject to extensions.

• foo.bar=@env:<var> will extract a string value from the environment variable <var> and put it in foo.bar.

Trait Implementations

impl Clone for FieldOverride

fn clone(&self) -> FieldOverride

Returns a duplicate of the value.

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

Performs copy-assignment from source.