Clojure（read-line）不等待输入 [英] Clojure (read-line) doesn't wait for input

问题描述

我在Clojure写了一个文本游戏。我想让玩家在控制台上输入行，并且游戏会逐行回应。

I am writing a text game in Clojure. I want the player to type lines at the console, and the game to respond on a line-by-line basis.

研究表明， （read-line）是一种在Clojure中从标准输入中获取文本行的方式，但它不适用于我。

Research showed me that (read-line) is the way one is meant to get text lines from standard input in Clojure, but it is not working for me.

我在一个新的Leiningen项目，我已经添加：main 子句到 project.clj 指向唯一的源文件：

I am in a fresh Leiningen project, and I have added a :main clause to the project.clj pointing to the only source file:

(ns textgame.core)

(defn -main [& args]
  (println "Entering -main")
;  (flush)                      ;makes no difference if flush are commented out
  (let [input (read-line)]
    (println "ECHO:" input))
;  (flush)
  (println "Exiting -main"))

$ b b

使用 lein run 产生：

Entering -main
ECHO: nil
Exiting -main

换句话说，没有机会在（读线）的控制台上输入要阅读的文本。

In other words, there is no opportunity to enter text at the console for (read-line) to read.

我应该如何得到Clojure等待字符和换行符并返回相应的字符串？

How should I get Clojure to wait for characters and newline to be entered and return the corresponding string?

（我使用GNOME Terminal 2.32.1在Linux Mint 11，Leiningen 1.6.1.1 on Java 1.6.0_26 Java HotSpot（TM）64位服务器VM，Clojure版本1.2.1。）

(I am using GNOME Terminal 2.32.1 on Linux Mint 11, Leiningen 1.6.1.1 on Java 1.6.0_26 Java HotSpot(TM) 64-Bit Server VM, Clojure version 1.2.1.)

更新：如果我运行 lein可以（println（read-line）），但不能使用 -main 函数并使用 lein run 运行。

Update: If I run lein repl, I can (println (read-line)), but not when I have a -main function and run using lein run.

推荐答案

已经有类似的问题，并诉诸构建一个jar文件，然后运行它。

I have had similar problems and resorted to building a jar file and then running that.

lein uberjar
java -jar project-standalone.jar

这有点慢，虽然它让我不稳定。一个从repl的工作原理将
更好

It's a bit slower, though it got me unstuck. An answer that works from the repl would be better

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