jlibghostty

Java FFM bindings for Ghostty's libghostty-vt.

This targets Java 22+ and uses java.lang.foreign, not JNI. The public API is intentionally small while Ghostty's C API is still marked unstable upstream.

Build

nix build

The default Nix package builds:

share/java/jlibghostty-0.1.0-SNAPSHOT.jar
maven/dev/jlibghostty/jlibghostty/0.1.0-SNAPSHOT/...

The jar contains the host platform libghostty-vt under dev/jlibghostty/native/<platform>/.

Gradle Consumer

After nix build, another Gradle project can consume the generated Maven repository:

repositories {
    maven {
        url = uri("/home/anon/Dev/jlibghostty/result/maven")
    }
}

dependencies {
    implementation("dev.jlibghostty:jlibghostty:0.1.0-SNAPSHOT")
}

tasks.withType<JavaExec>().configureEach {
    jvmArgs("--enable-native-access=ALL-UNNAMED")
}

If the app runs on the module path, use:

--enable-native-access=dev.jlibghostty

External Native Library

The library normally loads the bundled native libghostty-vt. To override it:

java -Djlibghostty.library.path=/path/to/libghostty-vt.so ...

or set:

export JLIBGHOSTTY_LIBRARY=/path/to/libghostty-vt.so

Example

try (Terminal terminal = Ghostty.open(TerminalOptions.of(80, 24))) {
    terminal.write("hello\r\n");
    System.out.println(terminal.snapshot());
}

Development Shell

nix develop

The shell provides Java, Gradle, and JLIBGHOSTTY_LIBRARY pointing at the Nix-built libghostty-vt.

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