Octave Metakernel

octave_metakernel.py

from subprocess import check_output
import os

from metakernel import ProcessMetaKernel, REPLWrapper, u


class OctaveKernel(ProcessMetaKernel):
    # Identifiers:
    implementation = 'octave_metakernel'
    language = 'octave'
    language_info = {
        'mimetype': 'text/x-octave',
        'language': 'octave',
        # ------ If different from 'language':
        # 'codemirror_mode': 'language',
        # 'pygments_lexer': 'language',
        'file_extension': 'm',
    }

    _banner = None
    @property
    def banner(self):
        if self._banner is None:
            self._banner = check_output(['octave', '--version']).decode('utf-8')
        return self._banner

    def makeWrapper(self):
        """Start a bash shell and return a :class:`REPLWrapper` object.

        Note that this is equivalent :function:`metakernel.pyexpect.bash`,
        but is used here as an example of how to be cross-platform.
        """
        if os.name == 'nt':
            orig_prompt = u(chr(3))
            prompt_cmd = u('disp(char(3))')
            change_prompt = None
        else:
            orig_prompt = 'octave.*>'
            prompt_cmd = None
            change_prompt = "PS1('{0}'); PS2('{1}')"

        return REPLWrapper('octave', orig_prompt, change_prompt,
                           prompt_cmd=prompt_cmd)


if __name__ == '__main__':
    from IPython.kernel.zmq.kernelapp import IPKernelApp
    IPKernelApp.launch_instance(kernel_class=OctaveKernel)