Rust bindings for GNU Octave oct.h

GNU Octave has an external code interface, allowing you to add functionality. Octave functions can be built using the C++ oct.h. They get packaged into a library with the name of the new function and an .oct extension. See Getting Started with Oct-Files. This Rust crate exposes bindings to oct.h, so that you may build the Octave functions using Rust instead of C++.

Examples

• helloworld - A port of the C++ helloworld

use octh::*;

#[no_mangle]
pub extern "C" fn Ghelloworld (library: *const dynamic_library, relative: bool) -> *mut dld_function {
    let help = "Hello World Help String";
    dld_function_create(helloworld, library, "helloworld".into(), help.into(), relative)
}

extern "C" fn helloworld (argin: *const value_list, nargout: i32) -> value_list {
    let nargin = value_list_length(argin);
    println!("Hello World has {} input arguments and {} output arguments.", nargin, nargout);
    let mut argout = OctaveValueList::new(nargout);
    for i in 0..nargout {
        argout.set_value(i, Matrix::new().to_value());
    }
    argout.unwrap()
}

Building

• Run cargo build. Octave must be installed. For development, I'm using Octave from Homebrew on both Mac and Linux. I installed it by running brew install octave. You will need to add these two environment variables, adjusted to your environment:

export OCTAVE_INCLUDE=/home/linuxbrew/.linuxbrew/Cellar/octave/5.1.0_8/include/octave-5.1.0
export OCTAVE_LIB=/home/linuxbrew/.linuxbrew/Cellar/octave/5.1.0_8/lib/octave/5.1.0

Issues

• #10 build.rs is too platform specific
• #36 macOS Catalina failing with __node_pointer defined multiple times