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Technical details

Implementation

Environment Setup

  1. Install JDK 8 or later (Java Development Kit)
  2. Install Node.js (JavaScript runtime environment) which should include NPM or if your Node.js installation does not include NPM also install it.
  3. Clone this repo and open a terminal in the bandish-editor project root directory

Browser Setup

Browser caching should be disabled when developer tools are open to prevent interference with shadow-cljs hot reloading.

Custom formatters must be enabled in the browser before CLJS DevTools can display ClojureScript data in the console in a more readable way.

Chrome/Chromium

  1. Open DevTools (Linux/Windows: F12 or Ctrl-Shift-I; macOS: ⌘-Option-I)
  2. Open DevTools Settings (Linux/Windows: ? or F1; macOS: ? or Fn+F1)
  3. Select Preferences in the navigation menu on the left, if it is not already selected
  4. Under the Network heading, enable the Disable cache (while DevTools is open) option
  5. Under the Console heading, enable the Enable custom formatters option

Firefox

  1. Open Developer Tools (Linux/Windows: F12 or Ctrl-Shift-I; macOS: ⌘-Option-I)
  2. Open Developer Tools Settings (Linux/macOS/Windows: F1)
  3. Under the Advanced settings heading, enable the Disable HTTP Cache (when toolbox is open) option

Unfortunately, Firefox does not yet support custom formatters in their devtools. For updates, follow the enhancement request in their bug tracker: 1262914 - Add support for Custom Formatters in devtools.

Development

Running the App

Start a temporary local web server, build the app with the dev profile, and serve the app, browser test runner and karma test runner with hot reload:

npm install
npx shadow-cljs watch app

Please be patient; it may take over 20 seconds to see any output, and over 40 seconds to complete.

When [:app] Build completed appears in the output, browse to http://localhost:8280/.

Opening the app in your browser starts a ClojureScript browser REPL, to which you may now connect.

Connecting to the browser REPL from Emacs with CIDER

Connect to the browser REPL:

M-x cider-jack-in-cljs

See Shadow CLJS User's Guide: Emacs/CIDER for more information. Note that the mentioned .dir-locals.el file has already been created for you.

Connecting to the browser REPL from VS Code with Calva

See the re-frame-template README for Calva instuctions. See also https://calva.io for Calva documentation.

Connecting to the browser REPL from other editors

See Shadow CLJS User's Guide: Editor Integration. Note that npm run watch runs npx shadow-cljs watch for you, and that this project's running build ids is app, browser-test, karma-test, or the keywords :app, :browser-test, :karma-test in a Clojure context.

Alternatively, search the web for info on connecting to a shadow-cljs ClojureScript browser REPL from your editor and configuration.

For example, in Vim / Neovim with fireplace.vim

  1. Open a .cljs file in the project to activate fireplace.vim
  2. In normal mode, execute the Piggieback command with this project's running build id, :app: 
    :Piggieback :app

Connecting to the browser REPL from a terminal

  1. Connect to the shadow-cljs nREPL:

    lein repl :connect localhost:8777

    The REPL prompt, shadow.user=>, indicates that is a Clojure REPL, not ClojureScript.

  2. In the REPL, switch the session to this project's running build id, :app:

    (shadow.cljs.devtools.api/nrepl-select :app)

    The REPL prompt changes to cljs.user=>, indicating that this is now a ClojureScript REPL.

  3. See user.cljs for symbols that are immediately accessible in the REPL without needing to require.

Running shadow-cljs Actions

See a list of shadow-cljs CLI actions:

npx shadow-cljs --help

Please be patient; it may take over 10 seconds to see any output. Also note that some actions shown may not actually be supported, outputting "Unknown action." when run.

Run a shadow-cljs action on this project's build id (without the colon, just app):

npx shadow-cljs <action> app

Debug Logging

The debug? variable in config.cljs defaults to true in dev builds, and false in prod builds.

Use debug? for logging or other tasks that should run only on dev builds:

(ns bhatkhande-svg-viewer.example
  (:require [bhatkhande-svg-viewer.config :as config])

(when config/debug?
  (println "This message will appear in the browser console only on dev builds."))

Production

Build the app with the prod profile:

npm install
npm run release

Please be patient; it may take over 15 seconds to see any output, and over 30 seconds to complete.

The resources/public/js/compiled directory is created, containing the compiled app.js and manifest.edn files.

Cors config for storage

Allow cors request from hosts. See https://cloud.google.com/storage/docs/gsutil/commands/cors#synopsis

gsutil cors set cors-config gs://cloudbucket.appspot.com