From f0aca17a0a9de5204cc26eb8f3dae4257175b210 Mon Sep 17 00:00:00 2001
From: Michael Wolf <mw@philologue.net>
Date: Sun, 8 Feb 2026 13:57:41 -0500
Subject: [PATCH] Pass URL parameters from path-to-regexp match into
 Call.parameters

Call.parameters was hardcoded to a placeholder object. Now the matched
route parameters are threaded through from the dispatcher to the handler
so handlers can access e.g. call.parameters.word.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 backend/diachron/app.ts     | 2 +-
 backend/diachron/routing.ts | 3 ++-
 backend/diachron/types.ts   | 4 ++--
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/backend/diachron/app.ts b/backend/diachron/app.ts
index 5bad0cc..7cd220a 100644
--- a/backend/diachron/app.ts
+++ b/backend/diachron/app.ts
@@ -61,7 +61,7 @@ const makeApp = ({routes, processTitle}: MakeAppArgs) => {
         console.log("DEBUG: trying pattern, match result =", match);
         if (match) {
             console.log("match", match);
-            const resp = await pr.handler(req);
+            const resp = await pr.handler(req, match.params);
 
             return resp;
         }
diff --git a/backend/diachron/routing.ts b/backend/diachron/routing.ts
index 2535743..fbd33fc 100644
--- a/backend/diachron/routing.ts
+++ b/backend/diachron/routing.ts
@@ -29,6 +29,7 @@ const processRoutes=(routes:Route[]) :ProcessedRoutes => {
         
         const handler: InternalHandler = async (
             expressRequest: ExpressRequest,
+            params: Record<string, string>,
         ): Promise<Result> => {
             const method = massageMethod(expressRequest.method);
             
@@ -47,7 +48,7 @@ const processRoutes=(routes:Route[]) :ProcessedRoutes => {
                 pattern: route.path,
                 path: expressRequest.originalUrl,
                 method,
-                parameters: { one: 1, two: 2 },
+                parameters: params,
                 request: expressRequest,
                 user: auth.user,
                 session: new Session(auth.session, auth.user),
diff --git a/backend/diachron/types.ts b/backend/diachron/types.ts
index 2cb2b8d..ce8e9ab 100644
--- a/backend/diachron/types.ts
+++ b/backend/diachron/types.ts
@@ -29,13 +29,13 @@ export type Call = {
     pattern: string;
     path: string;
     method: Method;
-    parameters: object;
+    parameters: Record<string, string>;
     request: ExpressRequest;
     user: User;
     session: Session;
 };
 
-export type InternalHandler = (req: ExpressRequest) => Promise<Result>;
+export type InternalHandler = (req: ExpressRequest, params: Record<string, string>) => Promise<Result>;
 
 export type Handler = (call: Call) => Promise<Result>;
 export type ProcessedRoute = {