Struct garden::model::Variable

pub struct Variable { /* private fields */ }

Config files can define a sequence of variables that are iteratively calculated. Variables can reference other variables in their Tree, Garden, and Configuration scopes.

The config values can contain either plain values, string ${expressions} that resolve against other Variables, or exec expressions that evaluate to a command whose stdout is captured and placed into the value of the variable.

An exec expression can use shell-like ${variable} references as which are substituted when evaluating the command, just like a regular string expression. An exec expression is denoted by using a “$ “ (dollar-sign followed by space) before the value. For example, using “$ echo foo” will place the value “foo” in the variable.

Implementations

impl Variable

pub fn new(expr: String, value: Option<String>) -> Self

pub fn is_empty(&self) -> bool

Does this variable have a value?

pub fn get_expr(&self) -> &String

pub fn get_expr_mut(&mut self) -> &mut String

pub fn set_expr(&mut self, expr: String)

pub fn set_value(&self, value: String)

pub fn get_value(&self) -> Option<&String>

Transform the RefCell<Option> value into an Option<&String>.

pub fn reset(&self)

Trait Implementations

impl Clone for Variable

fn clone(&self) -> Variable

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Variable

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

Formats the value using the given formatter.

impl Default for Variable

fn default() -> Variable

Returns the “default value” for a type.

impl Display for Variable

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

Formats the value using the given formatter.