start to implement proper custom errors

src/conf.rs

@@ -25,8 +25,7 @@ pub fn load_config( path : &str )-> Result<Conf, Box<dyn std::error::Error>> {
         .add_source(config::File::with_name(path))
 	.build()?;
             
-    let conf = settings
-            .try_deserialize::<Conf>()?;
+    let conf : Conf = settings.try_deserialize()?;
                 
     Ok(conf)
 }

src/errors.rs

@@ -0,0 +1,33 @@
+use std::error::Error;
+use std::fmt;
+
+use config::ConfigError;
+
+#[derive(Debug)]
+pub enum LJError {
+    ConfigFileMissing,
+
+}
+
+impl fmt::Display for LJError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+	use LJError::*;
+	
+	match self {
+	    ConfigFileMissing => {
+		write!(f, "first argument must be a TOML config file \
+			   (see copyme.Settings.toml)")
+	    },
+	}
+    }
+}
+
+impl Error for LJError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+	use LJError::*;
+
+	match self {
+	    ConfigFileMissing => None,
+	}
+    }
+}

src/main.rs

@@ -5,6 +5,7 @@
 
 mod redis_ctrl;
 mod conf;
+mod errors;
 
 use helios_dac::{Frame,
 		 Point,
@@ -17,34 +18,31 @@ use std::sync::Arc;
 
 use redis_ctrl::{RedisCtrl,Order};
 use conf::{load_config,Conf};
-
+use errors::LJError;
 
 const CENTER : (u16,u16) = (2000, 2000);
 
 pub fn main() {
-
-    let config = match load_config("Settings") {
-	Ok(c) => c,
-	Err(err) => {
-	    panic!("Unable to load config file: {:?}", err)
-	}
-    };
-           
-    let rs = match RedisCtrl::new() {
-	Ok(rs) => rs,
-	Err(err) => {
-	    panic!("Unable to connect to redis: {:?}", err);
-	}
-    };
-
-    match run_dac(config, rs) {
+    match run_all() {
 	Ok(()) => {},
 	Err(err) => {
-	    panic!("Error: {:?}", err)
+	    println!("Error: {}", err);
 	}
     }
 }
 
+fn run_all() -> Result<(), Box<dyn std::error::Error>> {
+    let Some(filename) = std::env::args().nth(1) else {
+	return Err(Box::new(LJError::ConfigFileMissing));
+    };
+    
+    let config = load_config(&filename)?;
+    
+    let rs = RedisCtrl::new()?;
+    
+    run_dac(config, rs)
+}
+
 fn run_dac(
     config: Conf,
     mut rs: RedisCtrl
@@ -54,7 +52,7 @@ fn run_dac(
 
     ctrlc::set_handler(move || {
         r.store(false, Ordering::SeqCst);
-    }).expect("Error setting Ctrl-C handler");
+    })?;
 
     let controller = NativeHeliosDacController::new()?;
     let devices = controller.list_devices()?;
@@ -72,7 +70,7 @@ fn run_dac(
 	    println!("{:?}", order);
 	}
 
-	let frame = get_next_frame(1000, &mut rs)?;
+	let frame = get_next_frame(1000, &mut rs, order == Order::Black)?;
 	
 	while let Ok(DeviceStatus::NotReady) = device.status() {
 	}
@@ -86,7 +84,8 @@ fn run_dac(
 
 fn get_next_frame(
     speed: u32,
-    rs: &mut RedisCtrl
+    rs: &mut RedisCtrl,
+    black: bool
 ) -> Result<Frame, Box<dyn std::error::Error>> {
     
     let line = rs.get("/pl/0/0")?;
@@ -100,7 +99,7 @@ fn get_next_frame(
 	    line2.push(*p);
 	}
     }
-    
+    println!("{:?}", line2);
     Ok(Frame::new(speed, line2))
 }
 
@@ -111,8 +110,8 @@ fn tuple_to_point(tpl: &(f32,f32,u32)) -> Point {
     let g = ((col >> 8) & 255) as u8 ;
     let b = (col & 255) as u8 ;
     
-    let x = CENTER.0 + *x as u16;
-    let y = CENTER.1 + *y as u16;
+    let x = CENTER.0 + *x as u16 * 2;
+    let y = CENTER.1 + *y as u16 * 2;
 
     if x >= 4096 || y >= 4096 {
 	println!("WARN: coordinate out of range: {} {}", x, y);