Struct EnvExpander 

pub struct EnvExpander<S: EnvSource = StdEnvSource> { /* private fields */ }

Expands environment variables in strings.

Supported syntax:

• ${VAR} - Required variable
• ${VAR:-default} - Variable with default value
• ${VAR:?error message} - Required with custom error
• $VAR - Simple variable reference

Implementations

impl EnvExpander<StdEnvSource>

pub fn new() -> Self

Create a new expander using the standard environment.

impl<S: EnvSource> EnvExpander<S>

pub fn with_source(source: S) -> Self

Create an expander with a custom environment source.

pub fn expand(&self, input: &str) -> ConnectionResult<String>

Expand environment variables in a string.

Examples

use prax_query::connection::EnvExpander;

// SAFETY: This is for documentation purposes only
unsafe { std::env::set_var("PRAX_TEST_HOST", "localhost") };
let expander = EnvExpander::new();
let result = expander.expand("postgres://${PRAX_TEST_HOST}/db").unwrap();
assert_eq!(result, "postgres://localhost/db");
unsafe { std::env::remove_var("PRAX_TEST_HOST") };

pub fn expand_url(&self, url: &str) -> ConnectionResult<String>

Expand a connection URL.

pub fn has_variables(input: &str) -> bool

Check if a string contains environment variable references.

Trait Implementations

impl<S: Clone + EnvSource> Clone for EnvExpander<S>

fn clone(&self) -> EnvExpander<S>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<S: Debug + EnvSource> Debug for EnvExpander<S>

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

Formats the value using the given formatter.

impl Default for EnvExpander<StdEnvSource>

fn default() -> Self

Returns the “default value” for a type.