基于Leiningen的REPL加载clj文件：Windows下运行Programming Clojure的snake.clj示例遇阻

Hey there, let's walk through how to get that snake example up and running with Leiningen's REPL on Windows. Here's the step-by-step breakdown:

1. 确认Leiningen已安装 #

First, make sure you have Leiningen properly set up on your Windows machine. Verify it works by opening a command prompt and running:

lein --version

If this throws an error, install Leiningen first before proceeding.

2. 创建Leiningen项目 #

Open your command prompt and run these commands to generate a standard Clojure project structure:

lein new app snake-example
cd snake-example

3. 配置项目文件与命名空间 #

The snake example uses the examples.snake namespace and depends on a custom examples.import-static macro from the book. Let's set up the required files:

• Inside the src folder, create a subfolder named examples
• In src/examples, create snake.clj and paste your full snake code (including the namespace declaration and import lines you shared)
• Also in src/examples, create import_static.clj with this content (this is the custom macro the book uses):

(ns examples.import-static)

(defmacro import-static
  [class & fields]
  `(do
     ~@(map (fn [field]
              `(def ~(symbol field) (. ~class ~(symbol field))))
            fields)))

4. 启动Leiningen REPL #

From the root of your snake-example project, run this command to start the REPL:

lein repl

Wait a moment for the REPL to initialize—you'll see a prompt like snake-example.core=> when it's ready.

5. 加载并运行蛇形程序 #

Once in the REPL, load the snake namespace with:

(require '[examples.snake :as snake])

If you edit the code later and need to reload it, use:

(require '[examples.snake :as snake] :reload)

Now run the program. If your snake.clj includes a -main function (standard for Clojure apps), execute:

(snake/-main)

If the example uses a custom start function (like a start function that initializes the Swing window), call that instead—e.g., (snake/start).

Windows特有的小提示 #

• After the snake window pops up, click on it to give it keyboard focus—otherwise, the arrow keys won't control the snake.
• If you get class-not-found errors, double-check your namespace declarations and imports for typos—small mistakes here are a common culprit!

内容的提问来源于stack exchange，提问作者Jeroen