2 releases
0.1.1 | Jun 16, 2021 |
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0.1.0 | Jun 9, 2021 |
#551 in Configuration
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Used in 2 crates
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tmp_env
tmp_env is a crate which lets you create temporary environment and be automatically cleaned when not needed.
For example sometimes you need to change the current directory or set environment variables to launch a process but you don't need this temporary environment for the rest of your program.
Then you will use tmp_env
to create environment variable using tmp_env::set_var
instead of std::env::set_var
to get from tmp_env::set_var
a datastructure which will automatically restore the
corresponding environment variable when dropped.
Install
Put this dependency in your Cargo.toml
tmp_env = "0.1"
Usage
- To temporary change the current directory:
{
let _tmp_current_dir = tmp_env::set_current_dir("src").expect("should set the new current_dir");
let current_dir = std::env::current_dir().expect("cannot get current dir from std env");
assert!(current_dir.ends_with("src"));
}
let current_dir = std::env::current_dir().expect("cannot get current dir from std env");
assert!(!current_dir.ends_with("src"));
- To temporary set an environment variable:
{
let _tmp_env = tmp_env::set_var("TEST_TMP_ENV", "myvalue");
assert_eq!(std::env::var("TEST_TMP_ENV"), Ok(String::from("myvalue")));
}
// Because guard `_tmp_env` is dropped then the environment variable is also automatically unset (not restored because no previous value was set)
assert!(std::env::var("TEST_TMP_ENV").is_err());
- To temporary create a directory
{
let tmp_dir = tmp_env::create_temp_dir().expect("cannot create temp dir"); // When tmp_dir is dropped this temporary dir will be removed
assert!(std::fs::metadata(&*tmp_dir).is_ok());
}
// The temporary directory is now removed
Dependencies
~310KB