Update notify module docs

samples/notify_sample.lua

@@ -1,34 +1,19 @@
+-- This is an example of a widget that,
+-- when a notification is added or removed,
+-- simply reads the current notifications and refreshes the screen.
 
-local curr_notab = {}
-local curr_titletab = {}
-local curr_keystab = {}
-
-function on_notify_posted(n)
-    curr_notab[n.key] = n
-    redraw()
+function on_resume()
+    refresh()
 end
 
-function on_notify_removed(n)
-    curr_notab[n.key] = nil
-    redraw()
-    ui:show_toast("Notify from "..n.package.." removed")
+function on_notifications_updated()
+    refresh()
 end
 
-function redraw()
-    fill_tabs(curr_notab)
-    ui:show_lines(curr_titletab)
-end
-
-function on_click(i)
-    notify:open(curr_keystab[i])
-end
-
-function fill_tabs(tab)
-    curr_titletab = {}
-    curr_keystab = {}
-
-    for k,v in pairs(tab) do
-        table.insert(curr_titletab, v.title)
-        table.insert(curr_keystab, v.key)
-    end
+function refresh()
+    local titles = map(
+        function(it) return it.title end,
+        notify:list()
+    )
+    ui:show_lines(titles)
 end