make robohash a function

Signed-off-by: William Casarin <jb55@jb55.com>

damus/Models/HomeModel.swift

@@ -506,7 +506,7 @@ func process_metadata_event(image_cache: ImageCache, profiles: Profiles, ev: Nos
     profiles.add(id: ev.pubkey, profile: tprof)
     
     // load pfps asap
-    let picture = tprof.profile.picture ?? "https://robohash.org/\(ev.pubkey)"
+    let picture = tprof.profile.picture ?? robohash(ev.pubkey)
     if let url = URL(string: picture) {
         Task<UIImage?, Never>.init(priority: .background) {
             let res = await load_image(cache: image_cache, from: url)
@@ -520,6 +520,10 @@ func process_metadata_event(image_cache: ImageCache, profiles: Profiles, ev: Nos
     notify(.profile_updated, ProfileUpdate(pubkey: ev.pubkey, profile: profile))
 }
 
+func robohash(_ pk: String) -> String {
+    return "https://robohash.org/" + pk
+}
+
 func process_contact_event(pool: RelayPool, contacts: Contacts, pubkey: String, ev: NostrEvent) {
     load_our_contacts(contacts: contacts, our_pubkey: pubkey, ev: ev)
     load_our_relays(our_pubkey: pubkey, pool: pool, ev: ev)

damus/Views/ProfilePicView.swift

@@ -76,7 +76,7 @@ struct ProfilePicView: View {
     
     var MainContent: some View {
         Group {
-            let picture = picture ?? profiles.lookup(id: pubkey)?.picture ?? "https://robohash.org/\(pubkey).png"
+            let picture = picture ?? profiles.lookup(id: pubkey)?.picture ?? robohash(pubkey)
             if let pic_url = URL(string: picture) {
                 ProfilePic(pic_url)
             } else {