Trait conch_runtime::env::VariableEnvironment

pub trait VariableEnvironment {
    type VarName: Eq + Hash;
    type Var;
    fn var<Q: ?Sized>(&self, name: &Q) -> Option<&Self::Var>
    where
        Self::VarName: Borrow<Q>,
        Q: Hash + Eq;
    fn set_var(&mut self, name: Self::VarName, val: Self::Var);
    fn env_vars(&self) -> Cow<[(&Self::VarName, &Self::Var)]>;
}

An interface for setting and getting shell and environment variables.

Associated Types

type VarName: Eq + Hash

The type of the name this environment associates for a variable.

type Var

The type of variables this environment holds.

Required Methods

fn var<Q: ?Sized>(&self, name: &Q) -> Option<&Self::Var> where
    Self::VarName: Borrow<Q>,
    Q: Hash + Eq, 

Get the value of some variable. The values of both shell-only and environment variables will be looked up and returned.

fn set_var(&mut self, name: Self::VarName, val: Self::Var)

Set the value of some variable, maintaining its status as an environment variable if previously set as such.

fn env_vars(&self) -> Cow<[(&Self::VarName, &Self::Var)]>

Unset the value of some variable (including environment variables). Get all current pairs of environment variables and their values.

Implementations on Foreign Types

impl<'a, T: ?Sized + VariableEnvironment> VariableEnvironment for &'a mut T

type VarName = T::VarName

type Var = T::Var

fn var<Q: ?Sized>(&self, name: &Q) -> Option<&Self::Var> where
    Self::VarName: Borrow<Q>,
    Q: Hash + Eq, 

fn set_var(&mut self, name: Self::VarName, val: Self::Var)

fn env_vars(&self) -> Cow<[(&Self::VarName, &Self::Var)]>

Implementors

• impl<A, IO, FD, L, V, EX, WD, N, ERR> VariableEnvironment for Env<A, IO, FD, L, V, EX, WD, N, ERR> where
    V: VariableEnvironment,
    N: Hash + Eq,  type VarName = V::VarName; type Var = V::Var;
• impl<A, IO, FD, L, V, EX, WD, N, ERR> VariableEnvironment for AtomicEnv<A, IO, FD, L, V, EX, WD, N, ERR> where
    V: VariableEnvironment,
    N: Hash + Eq,  type VarName = V::VarName; type Var = V::Var;
• impl<N: Eq + Hash + Clone, V: Clone + Eq> VariableEnvironment for VarEnv<N, V> type VarName = N; type Var = V;
• impl<N: Eq + Hash + Clone, V: Clone + Eq> VariableEnvironment for AtomicVarEnv<N, V> type VarName = N; type Var = V;