Support two-callsign search on contacts page to find contacts between a pair

lib/microwaveprop/radio.ex

@@ -82,9 +82,24 @@ defmodule Microwaveprop.Radio do
   defp maybe_search(query, ""), do: query
 
   defp maybe_search(query, search) do
-    pattern = "%" <> String.upcase(search) <> "%"
+    terms = search |> String.split() |> Enum.map(&String.trim/1) |> Enum.reject(&(&1 == ""))
 
-    where(query, [q], ilike(q.station1, ^pattern) or ilike(q.station2, ^pattern))
+    case terms do
+      [a, b] ->
+        pa = "%" <> String.upcase(a) <> "%"
+        pb = "%" <> String.upcase(b) <> "%"
+
+        where(
+          query,
+          [q],
+          (ilike(q.station1, ^pa) and ilike(q.station2, ^pb)) or
+            (ilike(q.station1, ^pb) and ilike(q.station2, ^pa))
+        )
+
+      _ ->
+        pattern = "%" <> String.upcase(search) <> "%"
+        where(query, [q], ilike(q.station1, ^pattern) or ilike(q.station2, ^pattern))
+    end
   end
 
   defp sort_opts(opts) do

lib/microwaveprop_web/live/contact_live/index.ex

@@ -91,7 +91,7 @@ defmodule MicrowavepropWeb.ContactLive.Index do
           <input
             name="search"
             value={@search}
-            placeholder="Search by callsign..."
+            placeholder="Search callsign or pair (e.g. W5LUA W5HN)..."
             type="text"
             class="input input-bordered input-sm w-64"
           />

test/microwaveprop_web/live/contact_live_test.exs

@@ -79,6 +79,27 @@ defmodule MicrowavepropWeb.ContactLiveTest do
       assert aa_pos < zz_pos
     end
 
+    test "search by single callsign matches either station", %{conn: conn} do
+      create_contact(%{station1: "W5LUA", station2: "W5HN"})
+      create_contact(%{station1: "K5TR", station2: "N5AC"})
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts?search=W5LUA")
+      assert html =~ "W5LUA"
+      refute html =~ "K5TR"
+    end
+
+    test "search by two callsigns finds contacts between that pair", %{conn: conn} do
+      create_contact(%{station1: "W5LUA", station2: "W5HN"})
+      create_contact(%{station1: "W5HN", station2: "W5LUA"})
+      create_contact(%{station1: "W5LUA", station2: "K5TR"})
+
+      {:ok, _lv, html} = live(conn, ~p"/contacts?search=W5LUA+W5HN")
+      assert html =~ "W5LUA"
+      assert html =~ "W5HN"
+      # The W5LUA-K5TR contact should not appear
+      refute html =~ "K5TR"
+    end
+
     test "pagination works", %{conn: conn} do
       for i <- 1..25 do
         ts = DateTime.add(~U[2026-01-01 00:00:00Z], i * 3600, :second)