[style] Improve integer completion percentage calculation for accurate representation (358/359 is NOT 100%)

src/style.rs

@@ -302,7 +302,7 @@ impl ProgressStyle {
                                 buf.write_fmt(format_args!("{}", HumanCount(len))).unwrap();
                             }
                             "percent" => buf
-                                .write_fmt(format_args!("{:.*}", 0, state.fraction() * 100f32))
+                                .write_fmt(format_args!("{:.*}", 0, (state.fraction() * 100f32).floor()))
                                 .unwrap(),
                             "percent_precise" => buf
                                 .write_fmt(format_args!("{:.*}", 3, state.fraction() * 100f32))
@@ -1055,4 +1055,25 @@ mod tests {
         assert_eq!(&buf[2], "bar");
         assert_eq!(&buf[3], "baz");
     }
+
+    #[test]
+    fn test_pct_precision() {
+        // seeing something that's not finished as 100% hurts my eyes
+        const WIDTH: u16 = 80;
+        let pos = Arc::new(AtomicPosition::new());
+        pos.set(358);
+        let state = ProgressState::new(Some(359), pos.clone());
+
+        let style = ProgressStyle::default_bar()
+                .template(
+                    &format!("{{pos}}/{{len}} {{percent}}%"),
+                ).unwrap();
+        let mut buf = Vec::new();
+        style.format_state(&state, &mut buf, WIDTH);
+        assert_eq!(&buf[0], "358/359 99%");
+        buf.clear();
+        pos.set(359);
+        style.format_state(&state, &mut buf, WIDTH);
+        assert_eq!(&buf[0], "359/359 100%");
+    }
 }