I'm learning Clojure.
To practice I started rewriting Java app I've written for my son to solve inequalities (like 3 + 2 ? 7).
In java I did (note using backslash escape chars)
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Scanner;
public class JavaTest {
public static void main(String[] args) throws Exception {
System.out.print("3 + 2 ? 7\b\b\b");
System.out.flush();
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
reader.readLine();
}
}
and see expected result: cursor placed on the question sign position and when I write a char it overwrites the question sign. correct output from java
But when I do the same (I believe so) in Clojure
(print "3 + 2 ? 7\b\b\b")
(flush)
(let [reader (java.io.BufferedReader. *in*)]
(.readLine reader))
I see that cursor is placed at the correct position for milliseconds and then is moved at the end of the line. And when I put a char, it is placed at very end of the string I printed. incorrect output from clojure
As a workaround I could use clojure-lanterna library, as suggested here, but I'd like to solve such a simple thing without any libraries (as I actually did in Java).
Any ideas on this? Or maybe someone can explain the reason of the behavior. I tried to find it in Clojure sources, but without success.
Thanks in advance!
Use clojure instead of clj.
clj wraps the ordinary Clojure REPL in rlwrap, which provides a more ergonomic command-line editing experience; presumably here it is messing with the cursor in some way.
