Arrow Keys

[Andrew G]

Hey guys,

I was hoping someone has run into this before, I must be doing something wrong/missing something.

To start, I'm using these:

        <dependency>

            <groupId>org.jline</groupId>

            <artifactId>jline</artifactId>

            <version>3.16.0</version>

        </dependency>

        <dependency>

            <groupId>org.jline</groupId>

            <artifactId>jline-terminal-jna</artifactId>

            <version>3.16.0</version>

        </dependency>

I'm simply trying to detect when an up/down key is pressed, my test is:

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.stream.Collectors;

import org.apache.commons.cli.Option;

import org.jline.builtins.Less;

import org.jline.builtins.Source;

import org.jline.keymap.BindingReader;

import org.jline.keymap.KeyMap;

import org.jline.terminal.Terminal;

import org.jline.terminal.TerminalBuilder;

import org.jline.utils.InfoCmp.Capability;

public class TestArrowKeys {

    public static void main(String[] args) throws IOException, InterruptedException {

        try (Terminal terminal = TerminalBuilder

            .builder()

            .jna(true)

            .build()) {

            // this works

            /*

            Less less = new Less(terminal, new File(".").getAbsoluteFile().toPath());

            List<Source> sources = new ArrayList<>();

            sources.add(new Source.PathSource(new File("pom.xml"), "pom.xml"));

            less.run(sources);

            */

            // this doesn't

            BindingReader bindingReader = new BindingReader(terminal.reader());

            KeyMap<Operation> keyMap = new KeyMap<>();

            keyMap.bind(Operation.UP, key(terminal, Capability.key_up));

            keyMap.bind(Operation.DOWN, key(terminal, Capability.key_down));

            keyMap.bind(Operation.COMMAND, Arrays.asList("a", "b", "c", "d"));

            terminal.writer().flush();

            while (true) {

                Operation op = bindingReader.readBinding(keyMap);

                System.out.println("read op: " + op);

            }

        }

    }

    

    public enum Operation {

        UP,

        DOWN,

        COMMAND

    }

}

With the code as is, output looks like, notice the ^[[B^[[A are arrow key presses:

f

s

a

read op: COMMAND

^[[B^[[A^[[B^[[A

a

read op: COMMAND

but if I uncomment the 'less' example, arrow keys seem to work fine.

I'm testing this in an WSL 2 - ubuntu xterm:

uname -a

Linux Andrew-PC 4.19.104-microsoft-standard #1 SMP Wed Feb 19 06:37:35 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Any idea what I'm missing?

Thank you,

Andrew

[Guillaume Nodet]

I think you need to initialize the terminal correctly:

Attributes attr = terminal.enterRawMode();
	terminal.puts(Capability.enter_ca_mode);
	terminal.puts(Capability.keypad_xmit);

Cheers,

Guillaume

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[Andrew G]

That worked thank you very much!

I had tried the terminal.puts calls by themselves, but not with the terminal.enterRawMode.

Guillaume

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