# standard imports
import typing

# bsie imports
from bsie.utils import errors, filematcher

# inner-module imports
from .. import base

# constants
MATCH_RULE = 'mime=text/plain'

# exports
__all__: typing.Sequence[str] = (
    'Plain',
    )


## code ##

class Plain(base.Reader):
    """Read paragraphs (seperated by newline) from a plain text file."""

    _match: filematcher.Matcher

    def __init__(self):
        self._match = filematcher.parse(MATCH_RULE)

    def __call__(self, path: str) -> typing.Sequence[str]:
        # perform quick checks first
        if not self._match(path):
            raise errors.UnsupportedFileFormatError(path)

        # open file in text mode
        with open(path, 'rt', encoding='UTF-8') as ifile:
            return [line.strip() for line in ifile.read().split('\n') if len(line.strip()) > 0]

## EOF ##