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Mini Shell
from __future__ import annotations
from collections.abc import Iterable
from contextlib import contextmanager
import logging
import sys
import textwrap
from typing import Optional
from typing import TextIO
from typing import Union
import warnings
from sqlalchemy.engine import url
from . import sqla_compat
log = logging.getLogger(__name__)
# disable "no handler found" errors
logging.getLogger("alembic").addHandler(logging.NullHandler())
try:
import fcntl
import termios
import struct
ioctl = fcntl.ioctl(0, termios.TIOCGWINSZ, struct.pack("HHHH", 0, 0, 0, 0))
_h, TERMWIDTH, _hp, _wp = struct.unpack("HHHH", ioctl)
if TERMWIDTH <= 0: # can occur if running in emacs pseudo-tty
TERMWIDTH = None
except (ImportError, OSError):
TERMWIDTH = None
def write_outstream(
stream: TextIO, *text: Union[str, bytes], quiet: bool = False
) -> None:
if quiet:
return
encoding = getattr(stream, "encoding", "ascii") or "ascii"
for t in text:
if not isinstance(t, bytes):
t = t.encode(encoding, "replace")
t = t.decode(encoding)
try:
stream.write(t)
except OSError:
# suppress "broken pipe" errors.
# no known way to handle this on Python 3 however
# as the exception is "ignored" (noisily) in TextIOWrapper.
break
@contextmanager
def status(status_msg: str, newline: bool = False, quiet: bool = False):
msg(status_msg + " ...", newline, flush=True, quiet=quiet)
try:
yield
except:
if not quiet:
write_outstream(sys.stdout, " FAILED\n")
raise
else:
if not quiet:
write_outstream(sys.stdout, " done\n")
def err(message: str, quiet: bool = False):
log.error(message)
msg(f"FAILED: {message}", quiet=quiet)
sys.exit(-1)
def obfuscate_url_pw(input_url: str) -> str:
u = url.make_url(input_url)
return sqla_compat.url_render_as_string(u, hide_password=True)
def warn(msg: str, stacklevel: int = 2) -> None:
warnings.warn(msg, UserWarning, stacklevel=stacklevel)
def msg(
msg: str, newline: bool = True, flush: bool = False, quiet: bool = False
) -> None:
if quiet:
return
if TERMWIDTH is None:
write_outstream(sys.stdout, msg)
if newline:
write_outstream(sys.stdout, "\n")
else:
# left indent output lines
lines = textwrap.wrap(msg, TERMWIDTH)
if len(lines) > 1:
for line in lines[0:-1]:
write_outstream(sys.stdout, " ", line, "\n")
write_outstream(sys.stdout, " ", lines[-1], ("\n" if newline else ""))
if flush:
sys.stdout.flush()
def format_as_comma(value: Optional[Union[str, Iterable[str]]]) -> str:
if value is None:
return ""
elif isinstance(value, str):
return value
elif isinstance(value, Iterable):
return ", ".join(value)
else:
raise ValueError("Don't know how to comma-format %r" % value)
Zerion Mini Shell 1.0