created env module

src/env.rs

@@ -0,0 +1,10 @@
+use std::env::{ set_var, var };
+
+pub type ENV_VAR = (&'static str, &'static str);
+
+pub static ATTACH_SYMBOL: ENV_VAR = ("ATTACH_SYMBOL", "*");
+
+pub fn env_var(var: ENV_VAR) -> String {
+	var(var.0).unwrap_or(var.1.to_string())
+}
+