Use crate unicode-width to determin width if chars.

Cargo.lock

@@ -13,6 +13,7 @@ dependencies = [
  "signal-hook",
  "termion",
  "unicode-segmentation",
+ "unicode-width",
 ]
 
 [[package]]
@@ -81,3 +82,9 @@ name = "unicode-segmentation"
 version = "1.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bb0d2e7be6ae3a5fa87eed5fb451aff96f2573d2694942e40543ae0bbe19c796"
+
+[[package]]
+name = "unicode-width"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"

Cargo.toml

@@ -10,3 +10,4 @@ edition = "2018"
 termion = "1.5.6"
 signal-hook = "0.3.8"
 unicode-segmentation = "1.7.1"
+unicode-width = "0.1.8"

src/alarm.rs

@@ -2,6 +2,7 @@ use std::io::Write;
 use std::process::{Command, Stdio, Child};
 use termion::{color, cursor, style};
 use termion::raw::RawTerminal;
+use unicode_width::UnicodeWidthStr;
 use crate::Config;
 use crate::clock::Clock;
 use crate::layout::{Layout, Position};
@@ -208,7 +209,7 @@ impl AlarmRoster {
                 let mut col =
                     layout.roster.col
                     + 3
-                    + unicode_length(&alarm.label);
+                    + UnicodeWidthStr::width(&alarm.label[..]) as u16;
                 let mut line = layout.roster.line + index as u16;
 
                 // Compensate for "hidden" items in the alarm roster.
@@ -316,7 +317,7 @@ impl AlarmRoster {
     pub fn width(&self) -> u16 {
         let mut width: u16 = 0;
         for alarm in &self.list {
-            let length = unicode_length(&alarm.label);
+            let length = UnicodeWidthStr::width(&alarm.label[..]) as u16;
             if length > width { width = length };
         }
         // Actual width is 4 columns wider if it's not 0.
@@ -330,6 +331,7 @@ impl AlarmRoster {
         }
     }
 
+    // Call when time jumps backwards.
     pub fn time_travel(&mut self, time: u32) {
         for alarm in self.list.iter_mut() {
             alarm.exceeded = alarm.time <= time;

src/utils.rs

@@ -1,11 +1,6 @@
 extern crate unicode_segmentation;
 use unicode_segmentation::UnicodeSegmentation;
 
-pub fn unicode_length(input: &str) -> u16 {
-    let length = UnicodeSegmentation::graphemes(input, true).count();
-    length as u16
-}
-
 pub fn unicode_truncate(input: &mut String, limit: usize) {
     match UnicodeSegmentation::grapheme_indices(input.as_str(), true).nth(limit) {
         Some((i, _)) => {