main.py

main.py

import structs
from structs import MakefileError
import sys
import os


def main(script, args):
    if len(args) != 1:
        print('Usage:\n{} <filename>'.format(script), file=sys.stderr)
        sys.exit(1)

    filename = args[0]

    if not (os.path.isfile(filename) and os.access(filename, os.R_OK)):
        print('File is not exists or access denied.', file=sys.stderr)
        sys.exit(1)

    result = structs.Makefile()
    with open(filename) as file:
        curr_goal = None
        for num, line in enumerate(file, 1):
            line = line.rstrip('\n')
            if line == '':
                try:
                    result.add_goal(curr_goal)
                except MakefileError as e:
                    print('Line #{}: Error while finishing goal block: {}'.format(num, e))
                    sys.exit(1)
                curr_goal = None
                continue
            if line[0] == '#':
                continue
            if line[0].isspace():
                if curr_goal is None:
                    print('Line #{}: Commands outside of goal block.'.format(num), file=sys.stderr)
                    sys.exit(1)
                else:
                    curr_goal.add_command(line)
            else:
                if curr_goal is not None:
                    print('Line #{}: Beginning new goal while previous isn\'t finished.'.format(num), file=sys.stderr)
                    sys.exit(1)
                else:
                    try:
                        curr_goal = structs.Goal.parse_header(line)
                    except MakefileError as e:
                        print('Line #{}: Error while parsing goal header: {}'.format(num, e))
                        sys.exit(1)
        if curr_goal is not None:
            try:
                result.add_goal(curr_goal)
            except MakefileError as e:
                print('Error while finishing last goal block: {}'.format(e))
                sys.exit(1)
    try:
        result.check()
    except MakefileError as e:
        print('Integrity check error: {}'.format(e))
        sys.exit(1)
    print('Makefile OK')

if __name__ == '__main__':
    main(sys.argv[0], sys.argv[1:])