make holds an Option<i8>

src/main.rs

@@ -152,7 +152,7 @@ fn run() -> SupResult<()> {
 	info!("loaded config: sup.toml");
 
 	let mut procs: Vec<Proc> = Vec::new();
-	let mut holds: i8 = 0;
+	let mut holds: Option<i8> = None;
 
 	for app in config.apps() {
 		if app.wait.unwrap_or(false) {
@@ -164,7 +164,7 @@ fn run() -> SupResult<()> {
 			match Proc::start(app) {
 				Ok(proc) => {
 					if proc.app.hold.unwrap_or(false) {
-						holds += 1;
+						holds = Some(holds.unwrap_or(0) + 1);
 					}
 					procs.push(proc);
 				}
@@ -173,12 +173,12 @@ fn run() -> SupResult<()> {
 		}
 	}
 
-	if holds < 1 {
+	if holds.unwrap_or(0) < 1 {
 		error!("no holds configured");
 		return Ok(());
 	}
 
-	while holds > 0 {
+	while holds > Some(0) {
 		let mut newprocs: Vec<Proc> = Vec::new();
 
 		while let Some(mut proc) = procs.pop() {
@@ -192,12 +192,12 @@ fn run() -> SupResult<()> {
 							Err(e) => {
 								error!("error restarting {}: {:?}", name, e);
 								if hold {
-									holds -= 1;
+									holds = Some(holds.unwrap_or(0) - 1);
 								}
 							}
 						};
 					} else if hold {
-						holds -= 1;
+						holds = Some(holds.unwrap_or(0) - 1);
 					}
 				}
 				Ok(None) => {