Fix delayed update of roster_width.

src/alarm.rs

@@ -1,6 +1,5 @@
 use std::io::Write;
 use std::process::{Command, Stdio};
-use std::sync::atomic::Ordering;
 use termion::{color, cursor, style};
 use termion::raw::RawTerminal;
 use crate::{Clock, Config, Layout, Position};
@@ -207,7 +206,6 @@ impl AlarmRoster {
 
     // Draw alarm roster according to layout.
     pub fn draw<W: Write>(&self, stdout: &mut RawTerminal<W>, layout: &mut Layout) {
-        let mut width: u16 = 0;
         let mut index = 0;
 
         // Find first item to print in case we lack space to print them all.
@@ -247,16 +245,17 @@ impl AlarmRoster {
                     .unwrap();
             }
             index += 1;
-            // Calculate roster width. Actual display width is 3 chars wider.
-            if 3 + alarm.display.len() as u16 > width {
-                width = 3 + alarm.display.len() as u16;
-            }
         }
-        // Update layout information.
-        if layout.roster_width != width {
-            layout.roster_width = width;
-            layout.force_recalc.store(true, Ordering::Relaxed);
+    }
+
+    // Return width of roster.
+    pub fn width(&self) -> u16 {
+        let mut width: u16 = 0;
+        for alarm in &self.list {
+            if alarm.display.len() as u16 > width { width = alarm.display.len() as u16; }
         }
+        // Actual width is 3 columns wider if it's not 0.
+        if width == 0 { 0 } else { width.saturating_add(3) }
     }
 
     // Reset every alarm.

src/layout.rs

@@ -127,5 +127,12 @@ impl Layout {
             col: 12,
         };
     }
+
+    pub fn set_roster_width(&mut self, width: u16) {
+        if self.width != width {
+            self.roster_width = width;
+            self.force_recalc.store(true, Ordering::Relaxed);
+        }
+    }
 }
 

src/main.rs

@@ -79,6 +79,9 @@ fn main() {
     let mut buffer_updated: bool = false;
     let mut countdown = Countdown::new();
 
+    // Initialise roster_width.
+    layout.set_roster_width(alarm_roster.width());
+
     // Register signal handlers.
     let signal = Arc::new(AtomicUsize::new(0));
     register_signal_handlers(&signal, &layout);
@@ -154,6 +157,7 @@ fn main() {
                     if alarm_roster.drop_last() {
                         // If we remove the last alarm we have to reset "countdown"
                         // manually. It is safe to do it anyway.
+                        layout.set_roster_width(alarm_roster.width());
                         countdown.reset();
                         layout.force_redraw = true;
                     }
@@ -180,6 +184,7 @@ fn main() {
                             error_msg(&mut stdout, &layout, e);
                         } else {
                             // Input buffer processed without error.
+                            layout.set_roster_width(alarm_roster.width());
                             layout.force_redraw = true;
                         }
                         buffer.clear();