ldcheck.py

#!/usr/bin/env python3
from sys import version_info
if version_info < (3, 4):
    raise RuntimeError('Python 3.4 or newer required')

from parse import parse_ldraw_code
from colours import load_colours
from geometry import *
from pathlib import Path
import linetypes

from os.path import realpath
script_directory = Path(realpath(__file__)).parent

def load_config(filename):
    from configobj import ConfigObj
    from copy import deepcopy
    config = ConfigObj(filename, encoding = 'UTF8')
    read_config = deepcopy(config)
    if 'libraries' not in config:
        config['libraries'] = ['/path/to/ldraw']
    if config != read_config:
        config.write()
    check_library_paths(config)
    return config

def read_ldraw(file, *, name = '', config):
    model_body = [
        parse_ldraw_code(line)
        for line in file
    ]
    model = Model(body = model_body)
    model.name = name
    return model

def library_paths(config):
    for library_path_string in config['libraries']:
        yield Path(library_path_string).expanduser()

def check_library_paths(config):
    from sys import exit
    problems = False
    have_paths = False
    for library_path in library_paths(config):
        have_paths = True
        if not library_path.exists():
            problems = True
            print(str.format(
                'Library path {} does not exist',
                library_path,
            ))
        elif not library_path.exists():
            problems = True
            print(str.format(
                'Library path {} is not a directory',
                library_path,
            ))
    if not have_paths:
        print('No LDraw path specified')
        problems = True
    if problems:
        print('Please fix ldcheck.cfg')
        exit(1)

def find_ldconfig_ldr_paths(config):
    for library_path in library_paths(config):
        yield from [
            library_path / path
            for path in ['LDConfig.ldr', 'ldconfig.ldr']
            if (library_path / path).is_file()
        ]

class Model:
    def __init__(self, body):
        self.body = body
        self.body_offset = 0
    def filter_by_type(self, type):
        yield from [
            element
            for element in self.body
            if isinstance(element, type)
        ]
    @property
    def subfile_references(self):
        yield from self.filter_by_type(linetypes.SubfileReference)
    @property
    def line_segments(self):
        yield from self.filter_by_type(linetypes.LineSegment)
    @property
    def triangles(self):
        yield from self.filter_by_type(linetypes.Triangle)
    @property
    def quadrilaterals(self):
        yield from self.filter_by_type(linetypes.Quadrilateral)

import argparse
class ListTestSuiteAction(argparse.Action):
    def __init__(self, option_strings, dest, nargs = None, **kwargs):
        super().__init__(option_strings, dest, nargs = 0, **kwargs)
    def __call__(self, *args, **kwargs):
        from testsuite import load_tests
        from sys import exit
        from re import sub
        test_suite = load_tests()
        for test_name in sorted(test_suite['tests'].keys()):
            test_function = test_suite['tests'][test_name]
            help = sub(r'\s+', ' ', test_function.__doc__ or '').strip()
            print(test_name + ': ' + help)
        exit(0)

if __name__ == '__main__':
    from sys import argv
    parser = argparse.ArgumentParser()
    parser.add_argument('filename')
    parser.add_argument('--list',
        action = ListTestSuiteAction,
        help = 'Lists all possible checks and exit',
    )
    args = parser.parse_args()
    config = load_config('ldcheck.cfg')
    for ldconfig_ldr_path in find_ldconfig_ldr_paths(config):
        with ldconfig_ldr_path.open() as ldconfig_ldr:
            load_colours(ldconfig_ldr)
    with open(args.filename) as file:
        from os.path import basename
        model = read_ldraw(
            file,
            name = basename(args.filename),
            config = config,
        )
        from testsuite import load_tests, check_model, format_report
        test_suite = load_tests()
        report = check_model(model, test_suite)
        print(format_report(report, model, test_suite))