On Fri, Apr 8, 2011 at 2:52 AM, Gregg Williams <[email protected]> wrote:
> Having worked with Clojure for over a year, I can sympathize with
> Clojure beginners (like myself) who find it extremely difficult to do
> simple things with Clojure. (It took me weeks to get Clojure working
> with Emacs, Swank, and the Clojure Debugging Toolkit, but I'm
> persistent.)
>
> Now this. I'm learning Spanish, and I wanted to whip up a simple
> Clojure program to spit out randomly-generated vocabulary phrases,
> then give me the answer when I hit ENTER from the keyboard. Simple ...
> keyboard ... input. Simple, right?
>
> After considerable research, reading all sorts of different solutions
> (some of which dropped into Java) for this seemingly trivial task, I
> wrote an earlier version of this (now cleaned-up) code:
...
> I just want to practice Spanish! (Actually, I'd rather program
> Clojure, but I don't like wasting my time trying to do elementary
> things that SHOULD ... JUST ... WORK.) Can anybody suggest anything
> that will enable me to write this simple program that any middle-
> school student would find, well, basic if written in BASIC? Thanks.
The whole JVM ecosystem seems built around client-server
communications, noninteractive jobs, and client-side GUI; not
client-side console interaction. It's easier to do something like this
using a Swing GUI with a read-only JTextArea holding the interaction
history above a one-line JTextField used to submit new input; stick an
ActionListener on the JTextField and it will get called when enter is
pressed in the field. Or you can use something like this to sugar it
up:
(defmacro text-line [input-var & body]
`(let [f# (javax.swing.JTextField.)]
(doto f
(setEditable true)
(setColumns 60)
(.addActionListener
(proxy [ActionListener] []
(actionPerformed [_]
(let ~(conj input-var `(.getText f#))
(.setText f# "")
~@body)))))))
Sample usage:
(let [field (text-line [line] (println line))]
...
(.add some-panel field java.awt.layout.BorderLayout/SOUTH))
Untested.
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