colcon-pkg-config

An extension for colcon-core to set an environment variable to find pkg-config files.

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Check more than just <prefix>/lib/pkgconfig

/share/pkgconfig is widely used pkgconfig dir as well.

Not sure how to submit PR, but here is some code that searches other directories.

class PkgConfigEnvironment(EnvironmentExtensionPoint):
    """
    Extend the environment variable PKG_CONFIG_PATH.

    A package needs to provide the file 'lib/pkgconfig/<pkgname>.pc' to extend
    the environment variable.
    """

    def __init__(self):  # noqa: D107
        super().__init__()
        satisfies_version(
            EnvironmentExtensionPoint.EXTENSION_POINT_VERSION, '^1.0')

    def create_environment_hooks(self, prefix_path, pkg_name):  # noqa: D102
        subdirectory = self._get_pc_subdir(prefix_path, pkg_name)
        if subdirectory is not None:
            return create_environment_hook(
                'pkg_config', prefix_path, pkg_name, 'PKG_CONFIG_PATH',
                str(subdirectory), mode='prepend')
        return []
    
    def _get_pc_subdir(self, prefix_path, pkg_name):
        subdirectories = [Path('lib') / 'pkgconfig', 
                          Path('share') / 'pkgconfig']
        for subdirectory in subdirectories:
            pkg_config_file = prefix_path / subdirectory / (pkg_name + '.pc')
            logger.log(1, "checking '%s'" % pkg_config_file)
            if pkg_config_file.is_file():
                return subdirectory
        return None