feat: Add `getRoutingPath` to the return value of `createRoute`. (#161)

* feat(zod-openapi): add getRoutingPath

* feat(zod-openapi): add docs

* feat(zod-openapi): add versioning doc

.changeset/lovely-laws-cry.md

@@ -0,0 +1,5 @@
+---
+'@hono/zod-openapi': minor
+---
+
+Add getRoutingPath to the return value of createRoute.

packages/zod-openapi/README.md

@@ -203,6 +203,18 @@ import { prettyJSON } from 'hono/pretty-json'
 app.use('/doc/*', prettyJSON())
 ```
 
+### Configure middleware for each endpoint
+
+You can configure middleware for each endpoint from a route created by `createRoute` as follows.
+
+```ts
+import { prettyJSON } from 'hono/pretty-json'
+import { cache } from 'honoc/cache'
+
+app.use(route.getRoutingPath(), prettyJSON(), cache({ cacheName: "my-cache" }))
+app.openapi(route, handler)
+```
+
 ### RPC Mode
 
 Zod OpenAPI Hono supports Hono's RPC mode. You can define types for the Hono Client as follows:

packages/zod-openapi/src/index.ts

@@ -323,9 +323,18 @@ export class OpenAPIHono<
   }
 }
 
+type RoutingPath<P extends string> = P extends `${infer Head}/{${infer Param}}${infer Tail}` ? `${Head}/:${Param}${RoutingPath<Tail>}` : P
+
 export const createRoute = <P extends string, R extends Omit<RouteConfig, 'path'> & { path: P }>(
   routeConfig: R
-) => routeConfig
+) => {
+  return {
+    ...routeConfig,
+    getRoutingPath(): RoutingPath<R['path']> {
+      return routeConfig.path.replaceAll(/\/{(.+?)}/g, '/:$1') as RoutingPath<P>
+    }
+  }
+}
 
 extendZodWithOpenApi(z)
 export { z }

packages/zod-openapi/test/createRoute.test.ts

@@ -0,0 +1,62 @@
+/* eslint-disable node/no-extraneous-import */
+import { describe, it, expect, expectTypeOf } from 'vitest'
+import { createRoute, z } from '../src'
+
+describe('createRoute', () => {
+  it.each([
+    { path: '/users', expected: '/users' },
+    { path: '/users/{id}', expected: '/users/:id' },
+    { path: '/users/{uid}/posts/{postId}', expected: '/users/:uid/posts/:postId' },
+  ])('createRoute(%j)', ({ path, expected }) => {
+    const ParamsSchema = z.object({
+      id: z
+        .string()
+        .min(3)
+        .openapi({
+          param: {
+            name: 'id',
+            in: 'path',
+          },
+          example: '1212121',
+        }),
+    })
+
+    const UserSchema = z.object({
+      id: z.string().openapi({
+        example: '123',
+      }),
+      name: z.string().openapi({
+        example: 'John Doe',
+      }),
+      age: z.number().openapi({
+        example: 42,
+      }),
+    })
+
+    const config = {
+      method: 'get',
+      path,
+      request: {
+        params: ParamsSchema,
+      },
+      responses: {
+        200: {
+          content: {
+            'application/json': {
+              schema: UserSchema,
+            },
+          },
+          description: 'Retrieve the user',
+        },
+      },
+    } as const
+    const route = createRoute(config)
+
+    expect(route).toEqual({
+      ...config,
+      getRoutingPath: expect.any(Function),
+    })
+    expect(route.getRoutingPath()).toBe(expected)
+    expectTypeOf(route.getRoutingPath()).toEqualTypeOf<typeof expected>()
+  })
+})