moved environment variable code to a new module

src/command/share.rs

@@ -1,6 +1,5 @@
 //! globally available tmux commands.
 use std::{
-	env::var,
 	ffi::OsString,
 	process::exit
 };
@@ -12,7 +11,12 @@ use tmux_interface::{
 	commands
 };
 
-use crate::{ error, flag, util };
+use crate::{
+	env::{ self, env_var },
+	error,
+	flag,
+	util
+};
 
 pub fn attach(pargs: &mut Arguments) {
 	//	don't allow unflagged nests
@@ -119,7 +123,7 @@ pub fn list() {
 	}
 
 	//	get attached session symbol
-	let attach_symbol = var("REMUX_ATTACH_SYMBOL").unwrap_or("*".to_string());
+	let attach_symbol = env_var(env::ATTACH_SYMBOL);
 
 	//	pretty print session list
 	println!("sessions:");

src/env.rs

@@ -1,10 +1,12 @@
-use std::env::{ set_var, var };
+use std::env::var;
 
-pub type ENV_VAR = (&'static str, &'static str);
+pub type EnvVar = (&'static str, &'static str);
 
-pub static ATTACH_SYMBOL: ENV_VAR = ("ATTACH_SYMBOL", "*");
+pub static ATTACH_SYMBOL: EnvVar = ("ATTACH_SYMBOL", "*");
 
-pub fn env_var(var: ENV_VAR) -> String {
-	var(var.0).unwrap_or(var.1.to_string())
+pub fn env_var(envvar: EnvVar) -> String {
+	var(envvar.0).unwrap_or(envvar.1.to_string())
 }
 
+pub fn tmux() -> bool { !var("TMUX").unwrap_or("".to_string()).is_empty() }
+

src/main.rs

@@ -6,6 +6,7 @@ use std::{
 use pico_args::Arguments;
 
 mod command;
+mod env;
 mod error;
 mod flag;
 mod help;

src/util.rs

@@ -1,5 +1,5 @@
 use std::{
-	env::{ current_dir, var },
+	env::current_dir,
 	path::PathBuf,
 	process::exit
 };
@@ -11,7 +11,10 @@ use tmux_interface::{
 	variables::session::SessionsCtl
 };
 
-use crate::error;
+use crate::{
+	env,
+	error
+};
 
 ///	return a Vec of all sessions or None
 pub fn get_sessions() -> Option<Vec<Session>> {
@@ -23,10 +26,9 @@ pub fn get_sessions() -> Option<Vec<Session>> {
 
 ///	show the tmux nest text if env var is not unset
 pub fn prevent_nest() {
-	let tmux = var("TMUX").ok();
-	if tmux.is_some() && tmux.unwrap() != "" {
+	if env::tmux() {
 		println!("Sessions should be nested with care; unset TMUX or use the '-n' flag to allow.");
-		exit(1);
+		exit(6);
 	}
 }