feat: merge subscriptions crate into cosmic-settings repo

subscriptions/network-manager/src/hw_address.rs

@@ -0,0 +1,34 @@
+#[derive(Copy, Clone, PartialEq, Eq, Default, Debug, PartialOrd, Ord)]
+pub struct HwAddress {
+    address: u64,
+}
+
+impl HwAddress {
+    pub fn from_str(arg: &str) -> Option<Self> {
+        let columnless_vec = arg.split(":").collect::<Vec<&str>>();
+        if columnless_vec.len() * 3 - 1 != arg.len() {
+            return None;
+        }
+        for byte in &columnless_vec {
+            if byte.len() != 2 {
+                return None;
+            }
+        }
+        u64::from_str_radix(columnless_vec.join("").as_str(), 16)
+            .ok()
+            .and_then(|address| Some(HwAddress { address }))
+    }
+    pub fn from_string(arg: &String) -> Option<Self> {
+        HwAddress::from_str(arg.as_str())
+    }
+    pub fn to_string(&self) -> String {
+        format!("{:#x}", self.address)
+            .trim_start_matches("0x")
+            .chars()
+            .collect::<Vec<_>>()
+            .chunks(2)
+            .map(|chunk| chunk.iter().cloned().collect::<String>())
+            .collect::<Vec<String>>()
+            .join(":")
+    }
+}