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# Default view cutoff *in lines*
from typing import Iterable, AnyStr, List
from typing import Mapping
from typing import Tuple
VIEW_CUTOFF = 512
KEY_MAX = 30
class View:
name = None # type: str
prompt = None # type: Tuple[str,str]
content_types = [] # type: List[str]
def __call__(self, data: bytes, **metadata):
"""
Transform raw data into human-readable output.
Args:
data: the data to decode/format.
metadata: optional keyword-only arguments for metadata. Implementations must not
rely on a given argument being present.
Returns:
A (description, content generator) tuple.
The content generator yields lists of (style, text) tuples, where each list represents
a single line. ``text`` is a unfiltered byte string which may need to be escaped,
depending on the used output.
Caveats:
The content generator must not yield tuples of tuples,
because urwid cannot process that. You have to yield a *list* of tuples per line.
"""
raise NotImplementedError() # pragma: no cover
def format_dict(
d: Mapping[AnyStr, AnyStr]
) -> Iterable[List[Tuple[str, AnyStr]]]:
"""
Helper function that transforms the given dictionary into a list of
("key", key )
("value", value)
tuples, where key is padded to a uniform width.
"""
max_key_len = max(len(k) for k in d.keys())
max_key_len = min(max_key_len, KEY_MAX)
for key, value in d.items():
key += b":" if isinstance(key, bytes) else u":"
key = key.ljust(max_key_len + 2)
yield [
("header", key),
("text", value)
]
def format_text(text: AnyStr) -> Iterable[List[Tuple[str, AnyStr]]]:
"""
Helper function that transforms bytes into the view output format.
"""
for line in text.splitlines():
yield [("text", line)]
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