From 3b9c6d58dee043717ddb77a7006c96380bab714d Mon Sep 17 00:00:00 2001
From: ElnuDev <elnu@elnu.com>
Date: Mon, 14 Aug 2023 12:20:33 -0700
Subject: [PATCH] Implement PartialEq for SVGMeasure

---
 dyesub-tool/src/svg/measure.rs | 13 +++++++++++++
 dyesub-tool/src/svg/tests.rs   |  8 ++++++++
 2 files changed, 21 insertions(+)

diff --git a/dyesub-tool/src/svg/measure.rs b/dyesub-tool/src/svg/measure.rs
index 4a63dd0..7f442aa 100644
--- a/dyesub-tool/src/svg/measure.rs
+++ b/dyesub-tool/src/svg/measure.rs
@@ -1,4 +1,5 @@
 use super::SVGUnit;
+use std::cmp::Ordering;
 use std::fmt;
 use std::{
     fmt::Display,
@@ -40,6 +41,18 @@ impl PartialEq for SVGMeasure {
     }
 }
 
+impl PartialOrd for SVGMeasure {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(if self == other {
+            Ordering::Equal
+        } else if self.to_user_units() > other.to_user_units() {
+            Ordering::Greater
+        } else {
+            Ordering::Less
+        })
+    }
+}
+
 impl Display for SVGMeasure {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "{}{}", self.measure, self.unit)
diff --git a/dyesub-tool/src/svg/tests.rs b/dyesub-tool/src/svg/tests.rs
index 559e599..fd57bd3 100644
--- a/dyesub-tool/src/svg/tests.rs
+++ b/dyesub-tool/src/svg/tests.rs
@@ -44,3 +44,11 @@ fn ne() {
     let b = SVGMeasure::new(10.0, SVGUnit::Pixel);
     assert_ne!(a, b);
 }
+
+#[test]
+fn cmp() {
+    let m_10cm = SVGMeasure::new(10.0, SVGUnit::Centimeter);
+    let m_5mm = SVGMeasure::new(5.0, SVGUnit::Millimeter);
+    assert!(m_10cm > m_5mm);
+    assert!(m_5mm < m_10cm);
+}