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110 lines
3.3 KiB
Python
110 lines
3.3 KiB
Python
import functools
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from threading import Lock
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from .utils import supports_terminal_sequences, TERMINAL_SEQUENCES, write_string
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class MultilinePrinterBase:
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def __init__(self, stream=None, lines=1):
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self.stream = stream
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self.maximum = lines - 1
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def __enter__(self):
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return self
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def __exit__(self, *args):
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self.end()
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def print_at_line(self, text, pos):
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pass
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def end(self):
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pass
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def _add_line_number(self, text, line):
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if self.maximum:
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return f'{line + 1}: {text}'
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return text
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def write(self, *text):
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write_string(''.join(text), self.stream)
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class QuietMultilinePrinter(MultilinePrinterBase):
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pass
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class MultilineLogger(MultilinePrinterBase):
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def write(self, *text):
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self.stream.debug(''.join(text))
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def print_at_line(self, text, pos):
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# stream is the logger object, not an actual stream
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self.write(self._add_line_number(text, pos))
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class BreaklineStatusPrinter(MultilinePrinterBase):
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def print_at_line(self, text, pos):
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self.write(self._add_line_number(text, pos), '\n')
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class MultilinePrinter(MultilinePrinterBase):
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def __init__(self, stream=None, lines=1, preserve_output=True):
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super().__init__(stream, lines)
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self.preserve_output = preserve_output
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self._lastline = self._lastlength = 0
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self._movelock = Lock()
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self._HAVE_FULLCAP = supports_terminal_sequences(self.stream)
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def lock(func):
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@functools.wraps(func)
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def wrapper(self, *args, **kwargs):
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with self._movelock:
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return func(self, *args, **kwargs)
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return wrapper
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def _move_cursor(self, dest):
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current = min(self._lastline, self.maximum)
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yield '\r'
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distance = dest - current
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if distance < 0:
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yield TERMINAL_SEQUENCES['UP'] * -distance
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elif distance > 0:
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yield TERMINAL_SEQUENCES['DOWN'] * distance
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self._lastline = dest
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@lock
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def print_at_line(self, text, pos):
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if self._HAVE_FULLCAP:
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self.write(*self._move_cursor(pos), TERMINAL_SEQUENCES['ERASE_LINE'], text)
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text = self._add_line_number(text, pos)
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textlen = len(text)
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if self._lastline == pos:
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# move cursor at the start of progress when writing to same line
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prefix = '\r'
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if self._lastlength > textlen:
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text += ' ' * (self._lastlength - textlen)
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self._lastlength = textlen
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else:
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# otherwise, break the line
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prefix = '\n'
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self._lastlength = textlen
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self.write(prefix, text)
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self._lastline = pos
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@lock
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def end(self):
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# move cursor to the end of the last line, and write line break
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# so that other to_screen calls can precede
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text = self._move_cursor(self.maximum) if self._HAVE_FULLCAP else []
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if self.preserve_output:
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self.write(*text, '\n')
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return
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if self._HAVE_FULLCAP:
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self.write(
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*text, TERMINAL_SEQUENCES['ERASE_LINE'],
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f'{TERMINAL_SEQUENCES["UP"]}{TERMINAL_SEQUENCES["ERASE_LINE"]}' * self.maximum)
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else:
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self.write(*text, ' ' * self._lastlength)
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