DRY up the config a little bit more

.gitignore

@@ -3,21 +3,11 @@
 .vscode
 *.log
 *.pem
-*scratchpad*
-/config/master.key
-api_docs.md
-config/application.yml
-config/credentials.yml.enc
-coverage
 coverage_api
 coverage_fe
-dist/ # Parcel "accidents" happen here.
 docker_volumes
-erd_diagram.png
-erd.pdf
 latest_corpus.ts
 log/
-mqtt/
 node_modules
 package-lock.json
 public/assets/
@@ -25,3 +15,15 @@ public/direct_upload/temp/*.jpg
 public/dist
 public/system
 tmp
+api_docs.md
+erd_diagram.png
+erd.pdf
+*scratchpad*
+scratchpad.rb
+/config/master.key
+config/credentials.yml.enc
+
+# === Legacy
+config/application.yml
+coverage
+mqtt/

app/controllers/dashboard_controller.rb

@@ -1,7 +1,10 @@
 class DashboardController < ApplicationController
   before_action :set_global_config
 
-  OUTPUT_URL_PATH = "/assets/parcel"
+  # === THESE CONSTANTS ARE CONFIGURABLE: ===
+  OUTPUT_URL = "/" + File.join("assets", "parcel") # <= served from public/ dir
+                                                   # <= See PUBLIC_OUTPUT_DIR
+  CACHE_DIR  = File.join(".cache")
 
   CSS_INPUTS  = HashWithIndifferentAccess.new({
     front_page: "/css/laptop_splash.scss",
@@ -15,20 +18,24 @@ class DashboardController < ApplicationController
     tos_update:     "/tos_update/index.tsx",
   })
 
+  # === THESE CONSTANTS ARE NON-CONFIGURABLE. ===
+  # They are calculated based on config above.
+  PUBLIC_OUTPUT_DIR = File.join("public", OUTPUT_URL)
+
   CSS_OUTPUTS = HashWithIndifferentAccess.new(CSS_INPUTS.reduce({}) do |acc, (key, value)|
-    acc[key] = OUTPUT_URL_PATH + value.gsub(/\.scss$/, ".css")
+    acc[key] = File.join(OUTPUT_URL, value.gsub(/\.scss$/, ".css"))
     acc
   end)
 
   JS_OUTPUTS = HashWithIndifferentAccess.new(JS_INPUTS.reduce({}) do |acc, (key, value)|
-    acc[key] = OUTPUT_URL_PATH + value.gsub(/\.tsx?$/, ".js")
+    acc[key] = File.join(OUTPUT_URL, value.gsub(/\.tsx?$/, ".js"))
     acc
   end)
 
   PARCEL_ASSET_LIST = (CSS_INPUTS.values + JS_INPUTS.values)
     .sort
     .uniq
-    .map { |x| "frontend" + x }
+    .map { |x| File.join("frontend", x) }
     .join(" ")
 
   PARCEL_HMR_OPTS   = [

lib/tasks/api.rake

@@ -54,15 +54,21 @@ namespace :api do
     intro = [ "node_modules/parcel-bundler/bin/cli.js",
               cmd,
               DashboardController::PARCEL_ASSET_LIST,
-              "--out-dir public#{DashboardController::OUTPUT_URL_PATH}",
-              "--public-url /dist" ].join(" ")
+              "--out-dir",
+              DashboardController::PUBLIC_OUTPUT_DIR,
+              "--public-url",
+              DashboardController::OUTPUT_URL,
+            ].join(" ")
     sh [intro, opts, DashboardController::PARCEL_CLI_OUTRO].join(" ")
   end
 
   desc "Serve javascript assets (via Parcel bundler)"
   task serve_assets: :environment do
     # Clear out cache and previous builds on initial load.
-    sh "rm -rf .cache/ public/dist/"
+    sh ["rm -rf",
+        DashboardController::CACHE_DIR,
+        DashboardController::PUBLIC_OUTPUT_DIR
+       ].join(" ")
     parcel "watch", DashboardController::PARCEL_HMR_OPTS
   end