From 22f6534081acfabdab4956d337604a21e7da5b64 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@gmail.com>
Date: Tue, 22 Sep 2026 18:56:44 +0200
Subject: lib: generalize concepts

---
 ttwhy/routers/concepts.cppm  |  7 ++-----
 ttwhy/routers/echo.cppm      |  2 --
 ttwhy/routers/echo.tests.cpp | 20 +++++++++-----------
 3 files changed, 11 insertions(+), 18 deletions(-)

(limited to 'ttwhy/routers')

diff --git a/ttwhy/routers/concepts.cppm b/ttwhy/routers/concepts.cppm
index 9660afc..cfbcb5a 100644
--- a/ttwhy/routers/concepts.cppm
+++ b/ttwhy/routers/concepts.cppm
@@ -6,14 +6,11 @@ module;
 
 export module ttwhy.routers:concepts;
 
-import ttwhy.scanners;
-
 namespace ttwhy
 {
 
-  export template<typename Candidate>
-  concept router = requires(Candidate candidate, scanners::input_event event) {
-    typename Candidate::terminal_policy;
+  export template<typename Candidate, typename Event>
+  concept router = requires(Candidate candidate, Event event) {
     { candidate.process(event) } -> std::same_as<asio::awaitable<void>>;
   };
 
diff --git a/ttwhy/routers/echo.cppm b/ttwhy/routers/echo.cppm
index ff309c8..c9cd7c7 100644
--- a/ttwhy/routers/echo.cppm
+++ b/ttwhy/routers/echo.cppm
@@ -29,8 +29,6 @@ namespace ttwhy::routers
   export template<typename StreamType>
   struct echo
   {
-    using terminal_policy = scanners::xterm_policy;
-
     explicit echo(StreamType & stream)
         : m_output_stream{stream}
     {}
diff --git a/ttwhy/routers/echo.tests.cpp b/ttwhy/routers/echo.tests.cpp
index c6ea10a..da2db40 100644
--- a/ttwhy/routers/echo.tests.cpp
+++ b/ttwhy/routers/echo.tests.cpp
@@ -46,29 +46,27 @@ namespace
     }
   };
 
-  struct incomplete_router_no_policy
-  {
-    auto process(ttwhy::scanners::input_event) -> asio::awaitable<void>;
-  };
-
   struct incomplete_router_no_process
   {
-    using terminal_policy = ttwhy::scanners::xterm_policy;
   };
 
   struct incomplete_router_wrong_return
   {
-    using terminal_policy = ttwhy::scanners::xterm_policy;
     auto process(ttwhy::scanners::input_event) -> void;
   };
+
+  struct incomplete_router_wrong_event
+  {
+    auto process(int) -> asio::awaitable<void>;
+  };
 }  // namespace
 
 TEST_CASE("The router concept validates router candidate interfaces", "[router][concept]")
 {
-  STATIC_REQUIRE(ttwhy::router<ttwhy::routers::echo<mock_stream>>);
-  STATIC_REQUIRE_FALSE(ttwhy::router<incomplete_router_no_policy>);
-  STATIC_REQUIRE_FALSE(ttwhy::router<incomplete_router_no_process>);
-  STATIC_REQUIRE_FALSE(ttwhy::router<incomplete_router_wrong_return>);
+  STATIC_REQUIRE(ttwhy::router<ttwhy::routers::echo<mock_stream>, ttwhy::scanners::input_event>);
+  STATIC_REQUIRE_FALSE(ttwhy::router<incomplete_router_no_process, ttwhy::scanners::input_event>);
+  STATIC_REQUIRE_FALSE(ttwhy::router<incomplete_router_wrong_return, ttwhy::scanners::input_event>);
+  STATIC_REQUIRE_FALSE(ttwhy::router<incomplete_router_wrong_event, ttwhy::scanners::input_event>);
 }
 
 SCENARIO("The echo router handles terminal navigation within the valid printed area", "[router][echo]")
-- 
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