feat: start fonts ingesting

dot-matrix/src/font/font.rs

@@ -0,0 +1,31 @@
+const FONT_5x7_JSON: &str = include_str!("../../assets/fonts/5x7.json");
+
+pub struct Font {
+    pub name: String,
+    pub size: f64,
+    pub font_json: String,
+}
+
+/// Return the embedded font JSON by string key
+pub fn get_font_json(name: &str) -> Option<&'static str> {
+    match name {
+        "5x7" => Some(FONT_5x7_JSON),
+        _ => None,
+    }
+}
+
+impl Font {
+    pub fn new(name: &str, size: f64) -> Self {
+        Self {
+            font_json: get_font_json(name)
+                .unwrap_or_else(|| panic!("Unknown font: {}", name))
+                .to_string(),
+            name: name.to_string(),
+            size,
+        }
+    }
+
+    pub fn description(&self) -> String {
+        format!("{} {}", self.name, self.size)
+    }
+}