Crate envmnt

envmnt

Environment variables utility functions.

This library has many helper functions to access/modify/check environment variables.

Example

Get/Set/Remove environment variables

extern crate envmnt;

fn main() {
    if !envmnt::exists("MY_ENV_VAR") {
        envmnt::set("MY_ENV_VAR", "SOME VALUE");
    }

    let mut value = envmnt::get_or("MY_ENV_VAR", "DEFAULT_VALUE");
    println!("Env Value: {}", &value);

    value = envmnt::get_or_panic("MY_ENV_VAR");
    println!("Env Value: {}", &value);

    let pre_value = envmnt::get_set("MY_ENV_VAR", "SOME NEW VALUE");

    let value = envmnt::get_or("MY_ENV_VAR", "DEFAULT_VALUE");
    println!("New Env Value: {}", &value);
    println!("Previous Env Value: {:?}", &pre_value);

    let all_vars = envmnt::vars(); // returned as Vec<(String, String)>

    for (key, value) in all_vars {
        println!("{}: {}", key, value);
    }
}

Get/Set boolean environment variables and other comparisons

extern crate envmnt;

fn main() {
    envmnt::set_bool("FLAG_VAR", true);
    let flag_value = envmnt::is_or("FLAG_VAR", false);
    println!("Bool Flag: {}", &flag_value);

    let pre_value = envmnt::get_set("MY_ENV_VAR", "SOME NEW VALUE");
    println!("Pre Value Exists: {}", &pre_value.is_some());

    envmnt::set("MY_ENV_VAR", "SOME VALUE");
    let same = envmnt::is_equal("MY_ENV_VAR", "SOME VALUE");
    println!("Value Is Same: {}", &same);
}

Bulk Operations

extern crate envmnt;
extern crate indexmap;

use indexmap::IndexMap;

fn main() {
    let mut env: IndexMap<String, String> = IndexMap::new();
    env.insert("ENV_VAR1".to_string(), "MY VALUE".to_string());
    env.insert("ENV_VAR2".to_string(), "MY VALUE2".to_string());

    envmnt::set_all(&env);

    let value = envmnt::get_or_panic("ENV_VAR1");
    println!("Value Is: {}", &value);

    let mut found = envmnt::is_any_exists(&vec!["ENV_VAR1", "ENV_VAR2"]);

    println!("Any Found: {}", &found);

    found = envmnt::is_all_exists(&vec!["ENV_VAR1", "ENV_VAR2"]);

    println!("All Found: {}", &found);
}

File Operations

extern crate envmnt;

fn main() {
    let mut output = envmnt::load_file("./src/test/var.env");
    assert!(output.is_ok());

    let eval_env = |value: String| {
        let mut buffer = String::from("PREFIX-");
        buffer.push_str(&value);
        buffer
    };

    output = envmnt::evaluate_and_load_file("./src/test/var.env", eval_env);
    assert!(output.is_ok());
}

Installation

In order to use this library, just add it as a dependency:

[dependencies]
envmnt = "*"

Contributing

See contributing guide

License

Developed by Sagie Gur-Ari and licensed under the Apache 2 open source license.

Functions

evaluate_and_load_file	Parses the provided env file and loads all environment variables.
exists	Returns true environment variable is defined.
get_or	Returns the environment variable value or if is not defined, the default value will be returned.
get_or_panic	Returns the environment variable value. If the variable is not defined, this function will panic.
get_remove	Removes the provided environment variable and returns its previous value (if any).
get_set	Sets the environment variable value and returns the previous value.
is_all_exists	Returns true if all of environment variables are defined.
is_any_exists	Returns true if any of environment variables is defined.
is_equal	Returns true if the provided environment variable is defined and equals the provided value.
is_or	Returns false if environment variable value if falsy. The value is falsy if it is one of the following:
load_file	Parses the provided env file and loads all environment variables.
parse_file	Parses the provided env file and returns its content as a map of key/value.
remove	Removes the provided environment variable.
set	Sets the environment variable value.
set_all	Sets all the provided env key/value pairs.
set_bool	Sets the environment variable with a true/false value as string.
vars	Returns all environment variables as a vector.