Improved display printing, added extra debug.

Cargo.toml

@@ -14,7 +14,7 @@ zip = "8.3"
 csv = "1.4"
 
 [profile.dev]
-opt-level = 1
+opt-level = 3
 
 [profile.release]
 opt-level = 3

resources/gtfs.rs

@@ -0,0 +1,132 @@
+use gtfs_structures::{Agency, Calendar, CalendarDate, Route, Stop};
+use serde::{de::DeserializeOwned};
+use std::{collections::HashMap, fs::File};
+use zip::ZipArchive;
+
+// The main GTFS struct. This is similar to (but not exactly) gtfs-structures::Gtfs because we don't need everything
+#[derive(Debug)]
+pub struct Gtfs {
+    /// All agencies. They can not be read by `agency_id`, as it is not a required field
+    pub agencies: Vec<Agency>,
+    /// All Calendar by `service_id`
+    pub calendar: HashMap<String, Calendar>,
+    /// All calendar dates grouped by service_id
+    pub calendar_dates: HashMap<String, Vec<CalendarDate>>,
+    /// All routes by `route_id`
+    pub routes: HashMap<String, Route>,
+    /// All stop by `stop_id`.
+    pub stops: HashMap<String, Stop>,
+}
+
+// Utility function to load all records in a dataset
+fn load_all<V>(_: &V) -> bool { true } 
+
+// Loads a vector of the selected type
+fn load_vector<T: serde::de::DeserializeOwned>(
+    destination: &mut Vec<T>,
+    zip_reader: &mut ZipArchive<File>,
+    table_name: &str,
+) {
+    let file_reader = zip_reader.by_name(table_name).unwrap();
+    let mut rdr = csv::Reader::from_reader(file_reader);
+
+    for row in rdr.deserialize() {
+        let record: T = row.unwrap();
+        destination.push(record);
+    }
+}
+
+// Loads a HashMap of the selected type, using the provided index function as the key
+fn load_map<'a, V: DeserializeOwned>(
+    destination: &mut HashMap<String, V>,
+    zip_reader: &mut ZipArchive<File>,
+    table_name: &str,
+    index: fn(&V) -> String,
+    accept: fn(&V) -> bool,
+) {
+    let file_reader = zip_reader.by_name(table_name).unwrap();
+    let mut rdr = csv::Reader::from_reader(file_reader);
+
+    for row in rdr.deserialize() {
+        let record: V = row.unwrap();
+        if accept(&record) {
+            let idx: String = index(&record);
+            destination.insert(idx, record);
+        }
+    }
+}
+
+// Loads a HashMap of a vector of the selected type, using the provided index function as the key
+// And a predicate as a filter
+fn load_vector_map<'a, V: DeserializeOwned + Clone>(
+    destination: &mut HashMap<String, Vec<V>>,
+    zip_reader: &mut ZipArchive<File>,
+    table_name: &str,
+    index: fn(&V) -> String,
+    accept: fn(&V) -> bool,
+) {
+    let file_reader = zip_reader.by_name(table_name).unwrap();
+    let mut rdr = csv::Reader::from_reader(file_reader);
+
+    for row in rdr.deserialize() {
+        let record: V = row.unwrap();
+        if accept(&record) {
+            let idx: String = index(&record);
+            destination.entry(idx).or_insert_with(Vec::new).push(record);
+        }
+    }
+}
+
+pub fn init(src_file: &str, routes: Vec<String>) -> Gtfs {
+    // Open zip file
+    let mut zip_reader = zip::ZipArchive::new(File::open(src_file).unwrap()).unwrap();
+
+    let mut gtfs: Gtfs = Gtfs {
+        agencies: Vec::new(),
+        calendar: HashMap::new(),
+        calendar_dates: HashMap::new(),
+        routes: HashMap::new(),
+        stops: HashMap::new(),
+    };
+
+    // Agencies
+    load_vector(&mut gtfs.agencies, &mut zip_reader, "agency.txt");
+
+    // Calendars
+    load_map(
+        &mut gtfs.calendar,
+        &mut zip_reader,
+        "calendar.txt",
+        |c: &Calendar| String::from(&c.id),
+        load_all
+    );
+
+    // Calendar Dates
+    load_vector_map(
+        &mut gtfs.calendar_dates,
+        &mut zip_reader,
+        "calendar_dates.txt",
+        |d: &CalendarDate| String::from(&d.service_id),
+        load_all
+    );
+
+    // Stops
+    load_map(&mut gtfs.stops, 
+        &mut zip_reader, 
+        "stops.txt", 
+        |s: &Stop| {String::from(&s.id)},
+        load_all
+    );
+
+    // Routes
+    let accept_filter: fn(&Route) -> bool = (| rs: Vec<String>, r: &Route | {rs.contains(&r.short_name.unwrap())}).curry(routes);
+    load_map(
+        &mut gtfs.routes,
+        &mut zip_reader,
+        "routes.txt",
+        |r: &Route| String::from(&r.id),
+        accept_filter
+    );
+
+    return gtfs;
+}

src/gtfs/loader.rs

@@ -1,6 +1,6 @@
 use log::debug;
 use gtfs_structures::{Calendar, CalendarDate, RawStopTime, RawTrip, Route, Stop};
-use serde::de::DeserializeOwned;
+use serde::de::{DeserializeOwned};
 use std::{
     collections::{HashMap, HashSet},
     fs::File,
@@ -14,14 +14,14 @@ use crate::gtfs::{
 };
 
 trait Filter<T> {
-    fn accept(&self, v: &T) -> bool;
+    fn accept(&self, v: &T) -> Option<bool>;
 }
 
 // No filter on loaded records
 struct LoadAll {}
 impl<T> Filter<T> for LoadAll {
-    fn accept(&self, _: &T) -> bool {
+    fn accept(&self, _: &T) -> Option<bool> {
-        return true;
+        return Some(true);
     }
 }
 
@@ -29,9 +29,9 @@ struct LoadRoutes<'a> {
     routes: &'a HashSet<String>,
 }
 impl Filter<Route> for LoadRoutes<'_> {
-    fn accept(&self, r: &Route) -> bool {
+    fn accept(&self, r: &Route) -> Option<bool> {
         let short_name = &r.short_name;
-        return short_name.is_some() && self.routes.contains(short_name.as_ref().unwrap());
+        return Some(short_name.is_some() && self.routes.contains(short_name.as_ref()?));
     }
 }
 
@@ -39,9 +39,9 @@ struct LoadStops<'a> {
     stops: &'a HashSet<String>,
 }
 impl Filter<Stop> for LoadStops<'_> {
-    fn accept(&self, s: &Stop) -> bool {
+    fn accept(&self, s: &Stop) -> Option<bool> {
         let stop_code = &s.code;
-        return stop_code.is_some() && self.stops.contains(s.code.as_ref().unwrap());
+        return Some(stop_code.is_some() && self.stops.contains(s.code.as_ref()?));
     }
 }
 
@@ -49,9 +49,9 @@ struct LoadTrips<'a> {
     route_ids: &'a HashSet<String>,
 }
 impl Filter<RawTrip> for LoadTrips<'_> {
-    fn accept(&self, t: &RawTrip) -> bool {
+    fn accept(&self, t: &RawTrip) -> Option<bool> {
         let route_id = &t.route_id;
-        return self.route_ids.contains(route_id);
+        return Some(self.route_ids.contains(route_id));
     }
 }
 
@@ -60,8 +60,8 @@ struct LoadStopTimes<'a> {
     stop_ids: &'a HashSet<String>,
 }
 impl Filter<RawStopTime> for LoadStopTimes<'_> {
-    fn accept(&self, st: &RawStopTime) -> bool {
+    fn accept(&self, st: &RawStopTime) -> Option<bool> {
-        return self.stop_ids.contains(&st.stop_id) && self.trip_ids.contains(&st.trip_id);
+        return Some(self.stop_ids.contains(&st.stop_id) && self.trip_ids.contains(&st.trip_id));
     }
 }
 
@@ -70,14 +70,15 @@ fn load_vector<T: serde::de::DeserializeOwned>(
     destination: &mut Vec<T>,
     zip_reader: &mut ZipArchive<File>,
     table_name: &str,
-) {
+) -> Option<bool> {
-    let file_reader = zip_reader.by_name(table_name).unwrap();
+    let file_reader = zip_reader.by_name(table_name);
-    let mut rdr = csv::Reader::from_reader(file_reader);
+    let mut rdr = csv::Reader::from_reader(file_reader.ok()?);
 
     for row in rdr.deserialize() {
-        let record: T = row.unwrap();
+        let record: T = row.ok()?;
         destination.push(record);
     }
+    return Some(true);
 }
 
 // Loads a HashMap of the selected type, using the provided index function as the key
@@ -87,27 +88,30 @@ fn load_map<K, V, IndexFn, FilterT>(
     table_name: &str,
     index: IndexFn,
     filter: FilterT,
-) where
+)  -> Option<bool>
+    where
     K: Eq + Hash,
     V: DeserializeOwned,
     IndexFn: Fn(&V) -> K,
-    FilterT: Filter<V>,
+    FilterT: Filter<V> 
 {
-    let file_reader = zip_reader.by_name(table_name).unwrap();
+    let file_reader = (zip_reader.by_name(table_name)).ok()?;
     let mut rdr = csv::Reader::from_reader(file_reader);
 
     for row in rdr.deserialize() {
         if row.is_ok() {
-            let record: V = row.unwrap();
+            let record: V = row.ok()?;
-            if filter.accept(&record) {
+            let accepted = filter.accept(&record);
+            if accepted.is_some() && accepted? {
                 let idx: K = index(&record);
                 destination.insert(idx, record);
             }
         } else {
             print!("Row failed to deserialize row {:#?}", row.err());
-            panic!();
+            return None;
         }
     }
+    return Some(true);
 }
 
 // Loads a HashMap of a vector of the selected type, using the provided index function as the key
@@ -118,22 +122,25 @@ fn load_vector_map<'a, K, V, IndexFn, FilterT>(
     table_name: &str,
     index: IndexFn,
     filter: FilterT,
-) where
+) -> Option<bool> 
+    where
     K: Eq + Hash,
     V: DeserializeOwned,
     IndexFn: Fn(&V) -> K,
     FilterT: Filter<V>,
 {
-    let file_reader = zip_reader.by_name(table_name).unwrap();
+    let file_reader = zip_reader.by_name(table_name).ok()?;
     let mut rdr = csv::Reader::from_reader(file_reader);
 
     for row in rdr.deserialize() {
-        let record: V = row.unwrap();
+        let record: V = row.ok()?;
-        if filter.accept(&record) {
+        let accepted = filter.accept(&record);
+        if  accepted.is_some() && accepted? {
             let idx = index(&record);
             destination.entry(idx).or_insert_with(Vec::new).push(record);
         }
     }
+    return Some(true)
 }
 
 pub fn load_gtfs(

src/gtfs/mod.rs

@@ -2,11 +2,11 @@ mod arrival;
 mod loader;
 mod utils;
 pub mod structs;
-use chrono::{DateTime, Local, NaiveTime, Timelike};
+use chrono::{DateTime, Local, Timelike};
 use log::{debug};
+use sdl3::sys::pixels::SDL_ArrayOrder;
 use std::{
-    collections::{HashMap, HashSet},
+    collections::{HashMap, HashSet}, fs::File, io::Error
-    fs::File,
 };
 use gtfs_structures::{Exception, RawTrip};
 
@@ -15,7 +15,7 @@ use crate::gtfs::{loader::load_gtfs, structs::{Arrival, Gtfs, Preferences}};
 
 impl Gtfs {
 
-    pub fn get_next_arrivals_for(&self, target_datetime: &DateTime<Local>) -> Vec<Arrival<'_>> {
+    pub fn get_next_arrivals_for(&self, target_datetime: &DateTime<Local>) -> Option<Vec<Arrival<'_>>> {
         let naive_target = target_datetime.naive_local();
         let target_date = naive_target.date();
         
@@ -66,31 +66,33 @@ impl Gtfs {
 
         for (_id, stop_time) in self.stop_times.iter() {
             if trips.contains_key(&stop_time.trip_id) {
-                let stop_timestamp = stop_time.departure_time.or(stop_time.arrival_time).unwrap();
+                let stop_timestamp = stop_time.departure_time.or(stop_time.arrival_time)?;
-                debug!("Stop timestamp {} current timestamp {}", stop_timestamp, current_timestamp);
                 let trip= &self.trips.get(&stop_time.trip_id).unwrap();
                 if current_timestamp < stop_timestamp.into() {
                     let arrival: Arrival = Arrival {
-                        route: self.routes.get(&trip.route_id).unwrap(),
+                        route: self.routes.get(&self.trips.get(&stop_time.trip_id)?.route_id)?,
-                        stop: self.stops.get(&stop_time.stop_id).unwrap(),
+                        stop: self.stops.get(&stop_time.stop_id)?,
                         stop_time: stop_time,
                         trip: &trip,
-                        departure_time: NaiveTime::from_num_seconds_from_midnight_opt(stop_timestamp, 0).unwrap()
+                        departure_time: stop_timestamp.into()
                     };
+                    debug!("Arrival to {:#?} for trip ID {:#?}.", arrival.trip.trip_headsign.as_ref().unwrap(), arrival.trip.id);
                     arrivals.push(arrival);                        
                 }
             }
         }
+        arrivals.sort();
         debug!("Found {} arrivals", arrivals.len());
 
-        return arrivals;
+        return Some(arrivals);
     }
         
 
     /// Load a GTFS structure from a zip file
-    pub fn load(src_file: &str, prefs: &Preferences) -> Gtfs {
+    pub fn load(src_file: &str, prefs: &Preferences) -> Result<Gtfs, Error> {
         // Open zip file
-        let mut zip_reader = zip::ZipArchive::new(File::open(src_file).unwrap()).unwrap();
+        let zip_file = File::open(src_file)?;
+        let mut zip_reader = zip::ZipArchive::new(zip_file)?;
 
         let mut gtfs: Gtfs = Gtfs {
             agencies: Vec::new(),
@@ -105,6 +107,6 @@ impl Gtfs {
 
         load_gtfs(&mut gtfs, &mut zip_reader, &prefs.route_numbers, &prefs.stop_codes);
 
-        return gtfs;
+        return Ok(gtfs);
     }
 }

src/gtfs/structs.rs

@@ -1,6 +1,5 @@
 use std::collections::{HashMap, HashSet};
 
-use chrono::NaiveTime;
 use gtfs_structures::{Agency, Calendar, CalendarDate, RawStopTime, RawTrip, Route, Stop};
 
 // This is to store the preferences for the GTFS(-R) side of the code.
@@ -32,7 +31,7 @@ pub struct Gtfs {
 
 #[derive(Debug)]
 pub struct Arrival<'a> {
-    pub departure_time: NaiveTime,
+    pub departure_time: u32,
     pub route: &'a Route,
     pub stop: &'a Stop,
     pub stop_time: &'a RawStopTime,

src/gtfs/utils.rs

@@ -1,7 +1,7 @@
 use std::collections::HashSet;
 use crate::gtfs::Gtfs;
 
-pub fn stop_ids_from_codes(gtfs: &Gtfs, stop_codes: &HashSet<String>) -> HashSet<String> {
+pub(crate) fn stop_ids_from_codes(gtfs: &Gtfs, stop_codes: &HashSet<String>) -> HashSet<String> {
     let mut ids: HashSet<String> = HashSet::new();
 
     for stop in &gtfs.stops {
@@ -13,7 +13,7 @@ pub fn stop_ids_from_codes(gtfs: &Gtfs, stop_codes: &HashSet<String>) -> HashSet
     return ids;
 }
 
-pub fn route_ids_from_numbers(gtfs: &Gtfs, route_numbers: &HashSet<String>) -> HashSet<String> {
+pub(crate) fn route_ids_from_numbers(gtfs: &Gtfs, route_numbers: &HashSet<String>) -> HashSet<String> {
     let mut ids: HashSet<String> = HashSet::new();
 
     for route in &gtfs.routes {

src/main.rs

@@ -1,13 +1,15 @@
 mod gtfs;
 mod renderer;
-use std::{collections::{HashSet, btree_map::Entry}, ops::Add, process, rc::Rc, thread::Builder, time::SystemTime};
+use std::{collections::HashSet, ops::Add, process, thread::Builder, time::SystemTime};
 use chrono::{DateTime, Duration, Local, NaiveTime};
-use log::{Metadata, Record, debug, error, info};
+use log::{Metadata, Record, error, info};
 use sdl3::event::Event;
 use crate::{gtfs::structs::{Arrival, Gtfs}, renderer::structs::{DisplayData, DisplayEntry, Screen}};
 
 const SRC_FILE: &str = "/home/nahuel/Downloads/GTFS_Realtime.zip";
 const NUM_ARRIVALS: usize = 4;
+const UPDATE_INTERVAL_SECONDS: u64 = 62;
+
 
 // Custom Event to signal data refresh
 #[derive(Debug)] 
@@ -15,41 +17,41 @@ struct RefreshDataEvent {
 }
 
 
-fn refresh_schedule<'a>(gtfs: &'a Gtfs, screen: &mut Screen<'a>) -> Vec<Arrival<'a>>  {
+fn refresh_schedule<'a>(gtfs: &'a Gtfs, screen : &mut Screen<'a>) -> Option<Vec<Arrival<'a>>>  {
     let current_timestamp = SystemTime::now();
     let datetime: DateTime<Local> = current_timestamp.clone().into(); 
-    let mut next_arrivals: Vec<Arrival<'_>> = gtfs.get_next_arrivals_for(&datetime);
+    let mut next_arrivals: Vec<Arrival<'_>> = gtfs.get_next_arrivals_for(&datetime)?;
 
     if next_arrivals.len() < NUM_ARRIVALS {
         // If we don't have enough entries today, look for arrivals tomorrow.
         let mut tomorrow: DateTime<Local> = datetime.clone();
         tomorrow = tomorrow.with_time(NaiveTime::from_hms_opt(0, 0, 0).unwrap()).unwrap();
         tomorrow = tomorrow.add(Duration::days(1));
-        next_arrivals.append(&mut gtfs.get_next_arrivals_for(&tomorrow));
+        next_arrivals.append(&mut gtfs.get_next_arrivals_for(&tomorrow)?);
     }
 
     next_arrivals.sort();
 
     // Create the DisplayData structure to render the information to screen
-    let current_time =  Local::now().time();
     let mut display_data: DisplayData = DisplayData {
         lines: Vec::<DisplayEntry>::new(),
         status: None
     };
 
     display_data.lines.extend(next_arrivals.iter().map(|arrival| -> DisplayEntry {
+            
             DisplayEntry {
                 destination: arrival.stop_time.stop_headsign.clone()
                     .or(arrival.trip.trip_headsign.clone()
                     .or(Option::Some(String::from("Unknown")
                 ))).unwrap(),
                 route: arrival.route.short_name.clone().or(arrival.route.long_name.clone()).unwrap(),
-                due_in: (arrival.departure_time - current_time).num_minutes().try_into().unwrap()
+                departure_time: arrival.departure_time,
             }
         }));
 
     screen.update_information(&display_data);
-    return next_arrivals;
+    return Some(next_arrivals);
 }
 
 
@@ -71,13 +73,17 @@ fn main() {
         fn flush(&self) {}
     }
 
-    log::set_logger(&MY_LOGGER).unwrap();
+    let logger = log::set_logger(&MY_LOGGER);
+    if logger.is_err() {
+        print!("Error setting up the main logger:{:#?}", logger.err());
+        process::exit(-1);
+    }
     log::set_max_level(log::LevelFilter::Trace);
 
     // Create preferences structures from config
     let gtfs_prefs = gtfs::structs::Preferences  {
         route_numbers: HashSet::from([String::from("15A"), String::from("F1"), String::from("F2"), String::from("F3")]),
-        stop_codes: HashSet::from([String::from("1117")])
+        stop_codes: HashSet::from([String::from("1114")])
     };
 
     let screen_prefs = renderer::structs::Prefs {
@@ -88,7 +94,13 @@ fn main() {
 
     // Init GTFS static info
     info!("Loading GTFS data...");
-    let gtfs = Gtfs::load(SRC_FILE, &gtfs_prefs);
+    let res = Gtfs::load(SRC_FILE, &gtfs_prefs);
+
+    if let Err(e) = res {
+        error!("Error loading GTFS data: {}", e);
+        process::exit(-1);
+    } 
+    let gtfs = res.unwrap();
 
     // Init screen
     info!("Initializing screen...");
@@ -105,7 +117,7 @@ fn main() {
         .name("updater".to_string())
         .spawn(move || { 
             loop {
-                std::thread::sleep(std::time::Duration::new(60,0));
+                std::thread::sleep(std::time::Duration::new(UPDATE_INTERVAL_SECONDS,0));
                 let event = RefreshDataEvent {};
                 let send_result = event_sender.push_custom_event(event);
                 if send_result.is_err() {
@@ -133,9 +145,7 @@ fn main() {
                 // Is the custom event a Refresh Data event?
                 let refresh_data = event.as_user_event_type::<RefreshDataEvent>();
                 if refresh_data.is_some() {
-                    debug!("Received user event: {:#?}", refresh_data.unwrap());
+                    let _data: Option<Vec<Arrival<'_>>> = refresh_schedule(&gtfs, &mut screen);
-                    let _data: Vec<Arrival<'_>> = refresh_schedule(&gtfs, &mut screen);
-                    debug!("-------------------------------- Refresh done.");
                 }
             }
 

src/renderer/mod.rs

@@ -1,20 +1,18 @@
-
 pub mod structs;
-use std::cmp::min;
+use std::{cmp::min};
-
+use log::{error, warn};
 use sdl3::{Sdl, pixels::Color, rect::Rect};
 use structs::{Prefs, DisplayData};
 
 use crate::renderer::structs::Screen;
 
-const LINE_COUNT: i32 = 6;
+const LINE_COUNT: i32 = 5;
 const COLOR_LCD_AMBER   : Color = Color::RGB(0xf4, 0xcb, 0x60);
 const COLOR_LCD_GREEN   : Color = Color::RGB(0xb3, 0xff, 0x00);
 const COLOR_LCD_RED     : Color = Color::RGB(0xff, 0x3a, 0x4a);
-
+const COLOR_BACKGROUND  : Color = Color::RGB(0x0,  0x0,  0x0 );
-//const COLOR_BACKGROUND = pygame.Color(0, 0, 0)
+const COLOR_TEXT_BG     : Color = Color::RGBA(0x0, 0x0, 0x0, 0x0);
-const UPDATE_INTERVAL_SECONDS: u32 = 62;
+const TEXT_SIZE: f32 = 160.0;  // Size of the font in pixels
-const TEXT_SIZE: u32 = 160;  // Size of the font in pixels
 
 // Offsets of each part within a line
 const XOFFSET_ROUTE: u32 = 24;
@@ -22,7 +20,6 @@ const XOFFSET_DESTINATION: u32 = 300;
 const XOFFSEET_TIME_LEFT: u32 = 1606;
 const INTER_LINE_OVERLAP: u32 = 15; 
 
-
 impl Screen<'_> {
 
     pub fn get_context(&self) -> &Sdl {
@@ -35,45 +32,80 @@ impl Screen<'_> {
         return  COLOR_LCD_RED;
     }
 
+    fn format_due_for(&self, due_in: i32, departure_time: u32) -> String {
+        if due_in < 60 {
+            return String::from("due");
+        }
+        if due_in < 3600 {
+            return ((due_in / 60) as i32).to_string() + "min";
+        } 
+        return format!("{:02}:{:02}", (departure_time / 3600) as i32, ((departure_time % 3600) / 60) as i32);
+    }
+
 
     pub fn update_information(&mut self, display_data: &DisplayData) {
         self.do_clear();
-        let num_arrivals: i32 = min(if display_data.status.is_some() {LINE_COUNT - 1} else {LINE_COUNT}, display_data.lines.len().try_into().unwrap());
+
-        for line in 0..num_arrivals {
+        // Print status first
+        if display_data.status.is_some() {
+            // If the update has some information text, show it
+            self.do_print_at(5, display_data.status.as_ref().unwrap(), 0);
+        } else {
+            // Display date and time otherwise
+            self.do_print_at(5, &format!("TODO: DATE/TIME GOES HERE").to_string(), 0);
+        }
+
+        // Then data lines from the bottom up
+        let num_arrivals: i32 = min(LINE_COUNT, display_data.lines.len() as i32);
+        for index in 0..num_arrivals {
+            let line: u32 = ((num_arrivals - 1) - index) as u32;
             // Compose a line of text with all the information 
             let entry = display_data.lines.get(line as usize).unwrap();
-            let line: u32 = line.try_into().unwrap();
+            let due_in_mins = (entry.departure_time / 60) as i32;
-            let due_in_mins = (entry.due_in / 60) as i32;
+            let due_color: Color = self.color_for(due_in_mins);
-            let arrival_color: Color = self.color_for(due_in_mins);
+            let due_text = self.format_due_for(due_in_mins, entry.departure_time);
 
             self.color = COLOR_LCD_AMBER;
             self.do_print_at(line, &entry.route, XOFFSET_ROUTE);
             self.do_print_at(line, &entry.destination, XOFFSET_DESTINATION);
-            self.color = arrival_color;
+            self.color = due_color;
-            self.do_print_at(line, &due_in_mins.to_string(), XOFFSEET_TIME_LEFT);
+            self.do_print_at(line, &due_text, XOFFSEET_TIME_LEFT);
         };
-
-        if display_data.status.is_some() {
-            self.do_print_at(5, display_data.status.as_ref().unwrap(), 0);
-        }
         self.do_update();
     }
 
 
-    pub fn print(&mut self, line: u32, text: &str) {
+    pub fn _print(&mut self, line: u32, text: &str) {
         self.do_print_at(line, text, 0);
         self.do_update();
     }
 
 
-    fn do_print_at(&mut self, line: u32, text: &str, left: u32) -> u32 {
+    fn do_print_at(&mut self, line: u32, text: &str, left: u32) {
-        let rendered_text = self.font.render(text).solid(self.color).unwrap();
+        if  text.len() == 0 {
+            warn!("do_print_at called with a 0-length string");
+            return;  
+        }
+
+        let render_result = self.font.render(text).lcd(self.color, COLOR_BACKGROUND);
+
+        if render_result.is_err() {
+            error!("Error rendering text \"{}\": {:#?}", text, render_result.err());
+            return;
+        }
+
+        let rendered_text = render_result.unwrap();
         let texture_creator = self.canvas.texture_creator();
-        let texture = rendered_text.as_texture(&texture_creator).unwrap();
+        let texture = rendered_text.as_texture(&texture_creator);
-        let _= self.canvas.copy(&texture, 
+
+        if texture.is_err() {
+            error!("Error creating texture from rendered text: {:#?}", texture.err());
+            return;
+        }
+
+        let _= self.canvas.copy(&texture.unwrap(), 
             Rect::new(0, 0, rendered_text.width(), rendered_text.height()), 
             Rect::new(left.try_into().unwrap(), (line * (rendered_text.height() - INTER_LINE_OVERLAP)).try_into().unwrap(), rendered_text.width(), rendered_text.height()));
-        return left + rendered_text.width();
     }
 
 
@@ -89,7 +121,7 @@ impl Screen<'_> {
 
 
     fn do_clear(&mut self) {
-        self.canvas.set_draw_color(Color::BLACK);
+        self.canvas.set_draw_color(COLOR_BACKGROUND);
         self.canvas.clear();
     }
 
@@ -109,7 +141,7 @@ impl Screen<'_> {
 
         // Load font
         let ttf_context = sdl3::ttf::init().unwrap();
-        let font = ttf_context.load_font(&prefs.font_path, 128.0).unwrap();
+        let font = ttf_context.load_font(&prefs.font_path, TEXT_SIZE).unwrap();
         
         let mut screen: Screen = Screen {
             canvas:  Box::new(window.into_canvas()), 

src/renderer/structs.rs

@@ -18,7 +18,7 @@ pub struct Prefs {
 pub struct DisplayEntry {
     pub route: String,
     pub destination: String,
-    pub due_in: i32,
+    pub departure_time: u32,
 }
 
 pub struct DisplayData {