Source files
There will be two sets of source files - some for Clojurescript and some for electron. We start off by creating a project using Leiningenlein new cljstest1
We will use the lein-cljsbuild plugin for our convenience, so in addition to modifying the dependencies section in the project.clj file to
:dependencies [[org.clojure/clojure "1.8.0"]
[org.clojure/clojurescript "1.9.946"]]
we will also add a plugins section
:plugins [[lein-cljsbuild "1.1.5"]]
After this an execution of
lein deps
is sufficient to install all dependencies. We will also add some more options to the project.clj file, and what it looks like at the end is this.
The project.clj file
(defproject cljstest1 "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:license {:name "Eclipse Public License"
:url "http://www.eclipse.org/legal/epl-v10.html"}
:dependencies [[org.clojure/clojure "1.8.0"]
[org.clojure/clojurescript "1.9.946"]]
:plugins [[lein-cljsbuild "1.1.5"]]
:cljsbuild {
:builds [{ :id "default"
:source-paths ["src"]
:compiler {
:output-to "app/app.js"
:target :nodejs
:main cljstest1.core
:optimizations :simple
:pretty-print true
:externs ["externs.js"]
}
}
]
}
) As you can see we plan to generate the Electron app in app/app.js. The directory 'app' will be created soon. Before we forget we need to create the externs.js file which we will need in order to use __dirname from Clojurescript.
The externs.js file
var __dirname;
The core.cljs file
Leiningen generated a src/core.clj file for us. Let's rename it to core.cljs so that the cljsbuild tool finds it automatically. Here is what it looks like.(ns cljstest1.core
(:require [cljs.nodejs :as nodejs]))
(def electron-pkg (nodejs/require "electron"))
(def url-pkg (nodejs/require "url"))
(def path-pkg (nodejs/require "path"))
(defn create-window
[]
(.
(new
electron-pkg.BrowserWindow
#js
{:width 800 :height 600}
)
loadURL (url-pkg.format
#js
{:pathname (path-pkg.join js/__dirname "index.html")
:protocol "file"
:slashes true
}
)
)
)
(defn -main
[]
(.on (.-app electron-pkg) "ready" create-window)
)
(set! *main-cli-fn* -main)
The last line which updates the *main-cli-fn* variable is a very important part. Without that node.js won't be able to run the app.
After the Clojurescript part we need to generate the Electron part of our source. We need to create a directory 'app', and inside it place the following package.json file
The package.json file
{
"name": "app",
"version": "1.0.0",
"description": "",
"main": "app.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"start": "electron ."
},
"author": "",
"license": "ISC",
"dependencies": {
"electron": "~1.7.8"
}
}
In this directory, we will also place a index.html file
The index.html file
<html>
<body>
<h1>
Ha!</h1>
</body>
<html>Steps to compile and run
cd app; npm install; cd ..
lein cljsbuild once
cd app; npm start
