nip10: show initial reply information on notes

Using the newly merged nip10 code, we can show replies on notes!

This is not final, and it's actually different than how we do it in
Damus iOS. Not sure if I like it yet. We will likely have to put pubkey
information back in somewhere soon.

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

src/ui/mention.rs

@@ -0,0 +1,61 @@
+use crate::{colors, ui, Damus};
+use nostrdb::Transaction;
+
+pub struct Mention<'a> {
+    app: &'a mut Damus,
+    txn: &'a Transaction,
+    pk: &'a [u8; 32],
+    size: f32,
+}
+
+impl<'a> Mention<'a> {
+    pub fn new(app: &'a mut Damus, txn: &'a Transaction, pk: &'a [u8; 32]) -> Self {
+        let size = 16.0;
+        Mention { app, txn, pk, size }
+    }
+
+    pub fn size(mut self, size: f32) -> Self {
+        self.size = size;
+        self
+    }
+}
+
+impl<'a> egui::Widget for Mention<'a> {
+    fn ui(self, ui: &mut egui::Ui) -> egui::Response {
+        mention_ui(self.app, self.txn, self.pk, ui, self.size)
+    }
+}
+
+fn mention_ui(
+    app: &mut Damus,
+    txn: &Transaction,
+    pk: &[u8; 32],
+    ui: &mut egui::Ui,
+    size: f32,
+) -> egui::Response {
+    #[cfg(feature = "profiling")]
+    puffin::profile_function!();
+
+    ui.horizontal(|ui| {
+        let profile = app.ndb.get_profile_by_pubkey(txn, pk).ok();
+
+        let name: String =
+            if let Some(name) = profile.as_ref().and_then(crate::profile::get_profile_name) {
+                format!("@{}", name.username())
+            } else {
+                "??".to_string()
+            };
+
+        let resp = ui.add(egui::Label::new(
+            egui::RichText::new(name).color(colors::PURPLE).size(size),
+        ));
+
+        if let Some(rec) = profile.as_ref() {
+            resp.on_hover_ui_at_pointer(|ui| {
+                ui.set_max_width(300.0);
+                ui.add(ui::ProfilePreview::new(rec, &mut app.img_cache));
+            });
+        }
+    })
+    .response
+}