feat: add CompositeIcon struct for nesting SVGs

src/composite_icon.rs

@@ -0,0 +1,43 @@
+use crate::color_scheme::ColorScheme;
+
+pub struct CompositeIcon {
+    pub bg: ColorScheme,
+    pub emblem: Option<ColorScheme>,
+    pub emblem_x: f64,
+    pub emblem_y: f64,
+    pub emblem_size: f64,
+}
+
+impl CompositeIcon {
+    pub fn new(bg: ColorScheme) -> Self {
+        Self {
+            bg,
+            emblem: None,
+            emblem_x: 32.0,
+            emblem_y: 32.0,
+            emblem_size: 32.0,
+        }
+    }
+
+    pub fn set_emblem(&mut self, emblem: ColorScheme) {
+        self.emblem = Some(emblem);
+    }
+
+    pub fn render(&self) -> String {
+        if let Some(emblem) = &self.emblem {
+            format!(
+                r#"<svg viewBox="0 0 64 64" xmlns="http://www.w3.org/2000/svg">
+  <svg x="0" y="0" width="64" height="64" overflow="visible">
+{}
+  </svg>
+  <svg x="{}" y="{}" width="{}" height="{}" overflow="visible">
+{}
+  </svg>
+</svg>"#,
+                self.bg.content, self.emblem_x, self.emblem_y, self.emblem_size, self.emblem_size, emblem.content
+            )
+        } else {
+            self.bg.content.clone()
+        }
+    }
+}

src/main.rs

@@ -1,4 +1,5 @@
 mod color_scheme;
+mod composite_icon;
 mod config;
 mod icon_index;
 mod ui;