ui: move timeline view to its own file

Also add some thread methods for fetching new notes

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

src/filter.rs

@@ -1,3 +1,30 @@
+use crate::note::NoteRef;
+
+pub fn should_since_optimize(limit: Option<u16>, num_notes: usize) -> bool {
+    let limit = limit.unwrap_or(enostr::Filter::default_limit()) as usize;
+
+    // rough heuristic for bailing since optimization if we don't have enough notes
+    limit <= num_notes
+}
+
+pub fn since_optimize_filter_with(filter: &mut enostr::Filter, notes: &[NoteRef], since_gap: u64) {
+    // Get the latest entry in the events
+    if notes.is_empty() {
+        return;
+    }
+
+    // get the latest note
+    let latest = notes[0];
+    let since = latest.created_at - since_gap;
+
+    // update the filters
+    filter.since = Some(since);
+}
+
+pub fn since_optimize_filter(filter: &mut enostr::Filter, notes: &[NoteRef]) {
+    since_optimize_filter_with(filter, notes, 60);
+}
+
 pub fn convert_enostr_filter(filter: &enostr::Filter) -> nostrdb::Filter {
     let mut nfilter = nostrdb::Filter::new();