Build webapp Tailwind via Vite instead of the in-browser Play CDN

.dockerignore

@@ -1,6 +1,10 @@
 # Local Maven build outputs — re-generated inside the builder stage.
 **/target/
 
+# Local npm installs — frontend-maven-plugin runs `npm ci` inside the
+# builder stage, so any host-side install would just bloat the build context.
+**/node_modules/
+
 # Per-deployment runtime config + logs + GTFS payload + Postgres bind data.
 # Mounted into containers at runtime via volumes, not baked into the image.
 .deploy/

.gitignore

@@ -24,6 +24,9 @@ __pycache__/
 .playwright-mcp/
 map-fixed.png
 
+# Frontend npm installs (transitclockWebapp).
+node_modules/
+
 # Top-level docker-stack secrets (DB password, API key). .env.example is
 # committed as a template; .env is per-deployment.
 /.env

CLAUDE.md

@@ -21,6 +21,8 @@ Built from the repository root as a Maven multi-module project.
 
 There is no lint step configured in the build.
 
+The webapp module has a frontend toolchain (Vite + Vitest) wired into Maven via `frontend-maven-plugin`. `mvn package` on `transitclockWebapp` automatically downloads a pinned Node, runs `npm ci`, and runs `vite build` — its output (`target/frontend-dist/`) is folded into the WAR at `/dist`. `mvn verify` also runs Vitest. `-DskipTests` skips Vitest (the Vite build still runs because the WAR depends on its output).
+
 ## Code coverage
 
 JaCoCo 0.8.12 is wired at the root `pom.xml`. It inherits into any module that declares `<parent>`, which today means `transitclock`, `transitclockBarefootClient`, and `transitclockTraccarClient`. `transitclockApi` and `transitclockWebapp` don't declare `<parent>`, so they currently produce no coverage data.
@@ -83,6 +85,7 @@ GTFS data in the DB is versioned by `configRev` and travel-time data by `travelT
 - Bring tomcat up with the override: `docker compose -f docker-compose.yml -f docker-compose.dev.yml up -d tomcat`. The override deletes `web.war` from the image at startup so it doesn't fight the bind mount.
 - The override only affects `tomcat`; `core`, `db`, and `tools` keep their normal behavior.
 - Java class changes (anything under `transitclockWebapp/src/main/java`, `transitclockApi`, or core) still require `mvn -pl transitclockWebapp -am package -DskipTests` followed by `docker compose -f docker-compose.yml -f docker-compose.dev.yml restart tomcat`. Only the JSP/CSS/JS/HTML/image loop is fast.
+- For Tailwind / Vite-bundled assets, run `cd transitclockWebapp && npm run dev` in a second terminal — Vite watches `frontend/` and writes to `target/frontend-dist/`, which the dev override bind-mounts into Tomcat at `/dist`. Browser refresh shows the change.
 - To return to the production-style baked-WAR flow, drop the `-f docker-compose.dev.yml` flag.
 
 ## Conventions to be aware of

docker-compose.dev.yml

@@ -4,9 +4,15 @@
 # no docker rebuild, no compose restart.
 #
 # Usage:
-#   # one-time: populate target/web/WEB-INF/{lib,classes} for the JSPs
+#   # one-time: populate target/web/WEB-INF/{lib,classes} for the JSPs and
+#   # target/frontend-dist/ for the Vite-built Tailwind bundle.
 #   mvn -pl transitclockWebapp -am package -DskipTests
 #
+#   # for fast Tailwind / frontend iteration, run Vite in watch mode in a
+#   # second terminal — output goes to target/frontend-dist/, which the
+#   # bind mount below picks up:
+#   cd transitclockWebapp && npm run dev
+#
 #   # bring up tomcat with the override
 #   docker compose -f docker-compose.yml -f docker-compose.dev.yml up -d tomcat
 #
@@ -27,6 +33,7 @@ services:
       - ./transitclockWebapp/src/main/webapp:/usr/local/tomcat/webapps/web
       - ./transitclockWebapp/target/web/WEB-INF/lib:/usr/local/tomcat/webapps/web/WEB-INF/lib:ro
       - ./transitclockWebapp/target/web/WEB-INF/classes:/usr/local/tomcat/webapps/web/WEB-INF/classes:ro
+      - ./transitclockWebapp/target/frontend-dist:/usr/local/tomcat/webapps/web/dist:ro
     command:
       - |
         if [ -z "${TRANSITCLOCK_APIKEY:-}" ]; then

transitclockWebapp/frontend/tailwind.css

@@ -0,0 +1,7 @@
+@import "tailwindcss";
+
+@source "../src/main/webapp/**/*.jsp";
+@source "../src/main/webapp/**/*.tag";
+@source "../src/main/webapp/**/*.html";
+@source "../src/main/webapp/**/*.js";
+@source "../frontend/**/*.js";

transitclockWebapp/frontend/utils.js

@@ -0,0 +1,3 @@
+export function classNames(...parts) {
+  return parts.filter(Boolean).join(' ');
+}

transitclockWebapp/frontend/utils.test.js

@@ -0,0 +1,12 @@
+import { describe, it, expect } from 'vitest';
+import { classNames } from './utils.js';
+
+describe('classNames', () => {
+  it('joins truthy parts with spaces', () => {
+    expect(classNames('a', 'b', 'c')).toBe('a b c');
+  });
+
+  it('skips falsy parts', () => {
+    expect(classNames('a', null, undefined, false, '', 'b')).toBe('a b');
+  });
+});