fix: wrong icons selected on size mismatch

This will notably fix Firefox and Thunderbird returning a 16 px icon instead of a 48 px icon when requesting a 24 px icon

src/lib.rs

@@ -471,38 +471,41 @@ mod test {
     use std::path::PathBuf;
 
     #[test]
-    fn hicolor_firefox_24_png() {
-        let firefox = lookup("firefox").find();
+    fn hicolor_thunderbird_48_png() {
+        let thunderbird = lookup("thunderbird").with_size(24).find();
 
-        asserting!("Firefox contains only a 16x16 and 32x32 icon, so 16x16 should be returned")
-            .that(&firefox)
+        asserting!("thunderbird lacks a 24x24 icon, but a 48x48 icon is an ideal replacement")
+            .that(&thunderbird)
             .is_some()
             .is_equal_to(PathBuf::from(
-                "/usr/share/icons/hicolor/16x16/apps/firefox.png",
+                "/usr/share/icons/hicolor/48x48/apps/thunderbird.png",
             ));
     }
 
     #[test]
-    fn hicolor_firefox_48_png() {
-        let firefox = lookup("firefox").with_size(48).find();
-
-        asserting!("Firefox has a 48x48 icon, so that should be returned")
-            .that(&firefox)
-            .is_some()
-            .is_equal_to(PathBuf::from(
-                "/usr/share/icons/hicolor/48x48/apps/firefox.png",
-            ));
-    }
-
-    #[test]
-    fn hicolor_firefox_svg_fallback_to_png() {
-        let firefox = lookup("firefox").force_svg().find();
+    fn hicolor_libreoffice_svg() {
+        let libreoffice_writer = lookup("libreoffice-writer").force_svg().find();
 
         asserting!("Lookup with no parameters should return an existing icon")
-            .that(&firefox)
+            .that(&libreoffice_writer)
             .is_some()
             .is_equal_to(PathBuf::from(
-                "/usr/share/icons/hicolor/16x16/apps/firefox.png",
+                "/usr/share/icons/hicolor/scalable/apps/libreoffice-writer.svg",
+            ));
+    }
+
+    #[test]
+    fn gnome_preferences_desktop_theme() {
+        let preferences_desktop_theme = lookup("preferences-desktop-theme")
+            .force_svg()
+            .with_size(128)
+            .find();
+
+        asserting!("Lookup with no parameters should return an existing icon")
+            .that(&preferences_desktop_theme)
+            .is_some()
+            .is_equal_to(PathBuf::from(
+                "/usr/share/icons/gnome/256x256/apps/preferences-desktop-theme.png",
             ));
     }
 
@@ -544,11 +547,11 @@ mod test {
     }
 
     #[test]
-    fn vscode_pixmap() {
+    fn local_slack() {
         assert_eq!(
-            lookup("vscode").find(),
-            Some(PathBuf::from("/usr/share/pixmaps/vscode.png")),
-            "Is VS Code installed locally on the host?"
+            lookup("slack").find(),
+            Some(PathBuf::from("/usr/share/pixmaps/slack.png")),
+            "Is slack installed locally on the host?"
         );
     }
 
@@ -574,15 +577,6 @@ mod test {
         );
     }
 
-    #[test]
-    fn ubuntu_additional_drivers() {
-        assert_eq!(
-            lookup("jockey").find(),
-            Some(PathBuf::from("/usr/share/icons/Yaru/24x24/apps/jockey.png")),
-            "Is the gnome icon theme installed?"
-        );
-    }
-
     #[test]
     #[cfg(feature = "local_tests")]
     fn theme_lookup() {

src/theme/directories.rs

@@ -12,7 +12,7 @@ pub struct Directory<'a> {
 impl Directory<'_> {
     pub fn directory_size_distance(&self, size: i16, scale: i16) -> i16 {
         match self.type_ {
-            DirectoryType::Fixed => self.size * self.scale - size * scale,
+            DirectoryType::Fixed => (self.size * self.scale) - (size * scale),
 
             DirectoryType::Scalable => {
                 let scaled_requested_size = size * scale;
@@ -22,7 +22,7 @@ impl Directory<'_> {
                 } else {
                     let max_scaled_size = self.maxsize * self.scale;
                     if scaled_requested_size < max_scaled_size {
-                        scaled_requested_size - max_scaled_size
+                        max_scaled_size - scaled_requested_size
                     } else {
                         0
                     }

src/theme/mod.rs

@@ -55,9 +55,9 @@ impl Theme {
         )
     }
 
-    fn try_fold_icon_path<'a>(
+    fn try_fold_icon_path(
         &self,
-        dir_names: Vec<(&'a str, i16, bool)>,
+        dir_names: Vec<(&str, i16, bool)>,
         name: &str,
         prefer_svg: bool,
     ) -> Option<PathBuf> {
@@ -114,14 +114,24 @@ impl Theme {
         );
 
         unsorted.sort_by(|a, b| {
-            let ordering = if prefer_svg {
-                b.2.cmp(&a.2)
+            if prefer_svg && (a.2 || b.2) {
+                if a.2 == b.2 {
+                    a.1.cmp(&b.1)
+                } else {
+                    b.2.cmp(&a.2)
+                }
+            } else if a.1 == b.1 {
+                Ordering::Equal
+            } else if a.1 == 0 {
+                Ordering::Less
+            } else if b.1 == 0 {
+                Ordering::Greater
+            } else if a.1 == (size * scale) as i16 {
+                Ordering::Less
+            } else if b.1 == (size * scale) as i16 {
+                Ordering::Greater
             } else {
-                a.2.cmp(&b.2)
-            };
-            match ordering {
-                Ordering::Equal => a.1.cmp(&b.1),
-                _ => ordering,
+                a.1.cmp(&b.1)
             }
         });