dylint_uitesting 5.0.0

Better UI testing for dylint libraries with ui_test
Documentation 
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pub use dylint_internal::env::*;

use std::{
    env::{remove_var, set_var, var_os},
    ffi::{OsStr, OsString},
};

macro_rules! declare_env_var {
    ($var: ident) => {
        pub const $var: &str = stringify!($var);
    };
}

declare_env_var!(BLESS);
declare_env_var!(RUST_BACKTRACE);
declare_env_var!(RUST_LOG);

pub fn is_env_truthy(var: &str) -> bool {
    ["true", "1"].contains(
        &std::env::var_os(var)
            .map(|s| s.to_string_lossy().to_lowercase())
            .unwrap_or_default()
            .as_str(),
    )
}

/// Restores an env var on drop
// smoelius: `VarGuard` was copied from:
// https://github.com/rust-lang/rust-clippy/blob/9cc8da222b3893bc13bc13c8827e93f8ea246854/tests/compile-test.rs
// smoelius: Clippy dropped `VarGuard` when it switched to `ui_test`:
// https://github.com/rust-lang/rust-clippy/commit/77d10ac63dae6ef0a691d9acd63d65de9b9bf88e
#[must_use]
pub struct VarGuard {
    key: &'static str,
    value: Option<OsString>,
}

impl VarGuard {
    pub fn set(key: &'static str, val: impl AsRef<OsStr>) -> Self {
        let value = var_os(key);
        unsafe {
            set_var(key, val);
        }
        Self { key, value }
    }
}

impl Drop for VarGuard {
    fn drop(&mut self) {
        match self.value.as_deref() {
            None => unsafe { remove_var(self.key) },
            Some(value) => unsafe { set_var(self.key, value) },
        }
    }
}