added crontab. this is a test for viability

src/main.rs

@@ -1,11 +1,24 @@
-use std::thread;
+use std::{sync::{Arc, Mutex}, thread};
 
 use gpio_cdev::{Chip, LineRequestFlags};
+use cron_tab::Cron;
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let mut chip = Chip::new("/dev/gpiochip0")?;
-    alarm(&mut chip)?;
-    Ok(())
+    let chip = Arc::new(Mutex::new(Chip::new("/dev/gpiochip0")?));
+	let mut cron = Cron::new(chrono::Local);
+
+	let job_result = cron.add_fn("0 16 20 * * * *", move || {
+		let mut guard = chip.lock().unwrap();
+		alarm(&mut*guard).unwrap();
+	});
+
+	let _ = job_result.expect("Failed to add job");
+
+	cron.start();
+
+	println!("Started snooze-pal");
+
+	loop { }
 }
 
 fn alarm(chip: &mut Chip) -> Result<(), Box<dyn std::error::Error>> {
@@ -22,10 +35,3 @@ fn alarm(chip: &mut Chip) -> Result<(), Box<dyn std::error::Error>> {
 
     Ok(())
 }
-
-fn turn_off_led(chip: &mut Chip) -> Result<(), Box<dyn std::error::Error>> {
-    chip.get_line(17)?
-        .request(LineRequestFlags::OUTPUT, 0, "my-gpio")?
-        .set_value(0)?;
-    Ok(())
-}