configure

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# michael a.g. aïvázis
# orthologue
# (c) 1998-2020 all rights reserved
#

# externals
import datetime, os, sys

# the location of project configuration files
pdir = os.path.abspath(os.path.join(os.path.dirname(__file__), '.mm'))
# if it doesn't exist, make it
os.makedirs(pdir, exist_ok=True)

# attempt to
try:
    # access the framework
    import pyre
# if this fails
except ImportError:
    # the resource
    boot = 'pyre-1.0-boot.zip'
    # the local file
    local = os.path.join(pdir, boot)
    # if it not already here
    if not os.path.exists(local):
        # support for URL access
        import urllib.request
        # form the url to the bootstrapper
        url = 'http://pyre.orthologue.com/' + boot
        # show me
        print('downloading {!r}'.format(url))
        # pull the bootstrapper from the web
        with urllib.request.urlopen(url=url) as ins:
            # open the local file
            with open(local, 'wb') as outs:
                # pull the data and write it
                outs.write(ins.read())
    # grab the sys module
    import sys
    # so we can add the bootstrapper to it
    sys.path.insert(1, local)
    # try importing pyre again
    import pyre


# the app
class configure(pyre.application, family='pyre.applications.configure'):
    """
    The pyre configuration utility
    """

    # user configurable state
    # packages
    gsl = pyre.externals.gsl()
    gsl.doc = "the GSL installation"

    mpi = pyre.externals.mpi()
    mpi.doc = "the MPI installation"

    postgres = pyre.externals.postgres()
    postgres.doc = "the client side of postgres"

    python = pyre.externals.python()
    python = pyre.externals.python()
    python.doc = "the python installation"

    # geography
    config = pyre.properties.path(default=os.path.join(pdir, 'config.def'))
    config.doc = 'the path to the configuration file'


    # behavior
    @pyre.export
    def main(self, *args, **kwds):
        """
        The main entry point
        """
        # render the configuration in {mm} format
        table = self.render()
        # save the configuration
        self.save(table=table)
        # all done
        return 0


    # implementation
    def render(self, table=None):
        """
        Create a table with the {mm} settings for the given choices of packages
        """
        # initialize
        table = table or {}

        # gsl
        gsl = self.gsl
        # update the table
        if gsl:
            table['GSL_DIR'] = gsl.prefix
            table['GSL_VERSION'] = gsl.sigver
            table['GSL_INCDIR'] = gsl.join(gsl.incdir)
            table['GSL_LIBDIR'] = gsl.join(gsl.libdir)

        # mpi
        mpi = self.mpi
        # update the table
        if mpi:
            table['MPI_DIR'] = mpi.prefix
            table['MPI_INCDIR'] = mpi.join(mpi.incdir)
            table['MPI_LIBDIR'] = mpi.join(mpi.libdir)
            table['MPI_EXECUTIVE'] = mpi.launcher
            table['MPI_VERSION'] = mpi.flavor

        # postgres
        postgres = self.postgres
        # update the table
        if postgres:
            table['LIBPQ_DIR'] = postgres.prefix
            table['LIBPQ_VERSION'] = postgres.sigver
            table['LIBPQ_INCDIR'] = postgres.join(postgres.incdir)
            table['LIBPQ_LIBDIR'] = postgres.join(postgres.libdir)

        # python
        python = self.python
        # update the table
        if python:
            table['PYTHON'] = python.interpreter
            table['PYTHON_DIR'] = python.prefix
            table['PYTHON_INCDIR'] = python.join(python.incdir)
            table['PYTHON_LIBDIR'] = python.join(python.libdir)
            table['PYTHON_PYCFLAGS'] = '-b'
            table['PYTHON_LIB'] = python.interpreter

        # all done
        return table


    def save(self, table):
        """
        Generate the file with the configuration options
        """
        # open the output stream
        stream = self.config.open('w')
        # assemble the document
        doc = '\n'.join(self.assemble(table))
        # print
        print(doc, file=stream)
        # all done
        return table


    def assemble(self, table):
        """
        Generate the file with the configuration settings
        """
        # build a time stamp
        stamp = datetime.datetime.now().ctime()
        # render a preamble
        yield "# -*- Makefile -*-"
        yield "#"
        yield "# generated by configure on {}".format(stamp)
        yield "#"
        yield ""

        # go through all the variable names
        for key in sorted(table):
            # and print their values
            yield '{} = {}'.format(key, table[key])

        # epilogue
        yield ""
        yield "# end of file"

        # all done
        return

    # pyre framework hooks
    # support for the help system
    def pyre_banner(self):
        """
        Place the application banner in the {info} channel
        """
        # show the license header
        return 'configuration utility'


    # interactive session management
    def pyre_interactiveSessionContext(self, context):
        """
        Go interactive
        """
        # protect against bad contexts
        if context is None:
            # by initializing as an empty dict
            context = {}

        # set up some context
        context['config'] = self

        # and chain up
        return super().pyre_interactiveSessionContext(context=context)


# main
if __name__ == "__main__":
    # make an instance
    app = configure(name='configure')
    # ride
    status = app.run()
    # all done
    raise SystemExit(status)


# end of file