421 lines
14 KiB
Python
421 lines
14 KiB
Python
"""
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Helper functions for writing to terminals and files.
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"""
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import sys, os, unicodedata
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import py
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py3k = sys.version_info[0] >= 3
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py33 = sys.version_info >= (3, 3)
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from py.builtin import text, bytes
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win32_and_ctypes = False
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colorama = None
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if sys.platform == "win32":
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try:
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import colorama
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except ImportError:
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try:
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import ctypes
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win32_and_ctypes = True
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except ImportError:
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pass
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def _getdimensions():
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if py33:
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import shutil
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size = shutil.get_terminal_size()
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return size.lines, size.columns
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else:
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import termios, fcntl, struct
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call = fcntl.ioctl(1, termios.TIOCGWINSZ, "\000" * 8)
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height, width = struct.unpack("hhhh", call)[:2]
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return height, width
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def get_terminal_width():
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width = 0
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try:
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_, width = _getdimensions()
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except py.builtin._sysex:
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raise
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except:
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# pass to fallback below
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pass
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if width == 0:
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# FALLBACK:
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# * some exception happened
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# * or this is emacs terminal which reports (0,0)
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width = int(os.environ.get('COLUMNS', 80))
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# XXX the windows getdimensions may be bogus, let's sanify a bit
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if width < 40:
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width = 80
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return width
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terminal_width = get_terminal_width()
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char_width = {
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'A': 1, # "Ambiguous"
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'F': 2, # Fullwidth
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'H': 1, # Halfwidth
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'N': 1, # Neutral
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'Na': 1, # Narrow
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'W': 2, # Wide
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}
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def get_line_width(text):
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text = unicodedata.normalize('NFC', text)
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return sum(char_width.get(unicodedata.east_asian_width(c), 1) for c in text)
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# XXX unify with _escaped func below
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def ansi_print(text, esc, file=None, newline=True, flush=False):
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if file is None:
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file = sys.stderr
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text = text.rstrip()
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if esc and not isinstance(esc, tuple):
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esc = (esc,)
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if esc and sys.platform != "win32" and file.isatty():
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text = (''.join(['\x1b[%sm' % cod for cod in esc]) +
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text +
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'\x1b[0m') # ANSI color code "reset"
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if newline:
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text += '\n'
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if esc and win32_and_ctypes and file.isatty():
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if 1 in esc:
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bold = True
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esc = tuple([x for x in esc if x != 1])
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else:
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bold = False
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esctable = {() : FOREGROUND_WHITE, # normal
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(31,): FOREGROUND_RED, # red
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(32,): FOREGROUND_GREEN, # green
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(33,): FOREGROUND_GREEN|FOREGROUND_RED, # yellow
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(34,): FOREGROUND_BLUE, # blue
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(35,): FOREGROUND_BLUE|FOREGROUND_RED, # purple
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(36,): FOREGROUND_BLUE|FOREGROUND_GREEN, # cyan
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(37,): FOREGROUND_WHITE, # white
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(39,): FOREGROUND_WHITE, # reset
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}
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attr = esctable.get(esc, FOREGROUND_WHITE)
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if bold:
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attr |= FOREGROUND_INTENSITY
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STD_OUTPUT_HANDLE = -11
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STD_ERROR_HANDLE = -12
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if file is sys.stderr:
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handle = GetStdHandle(STD_ERROR_HANDLE)
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else:
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handle = GetStdHandle(STD_OUTPUT_HANDLE)
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oldcolors = GetConsoleInfo(handle).wAttributes
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attr |= (oldcolors & 0x0f0)
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SetConsoleTextAttribute(handle, attr)
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while len(text) > 32768:
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file.write(text[:32768])
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text = text[32768:]
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if text:
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file.write(text)
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SetConsoleTextAttribute(handle, oldcolors)
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else:
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file.write(text)
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if flush:
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file.flush()
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def should_do_markup(file):
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if os.environ.get('PY_COLORS') == '1':
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return True
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if os.environ.get('PY_COLORS') == '0':
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return False
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return hasattr(file, 'isatty') and file.isatty() \
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and os.environ.get('TERM') != 'dumb' \
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and not (sys.platform.startswith('java') and os._name == 'nt')
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class TerminalWriter(object):
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_esctable = dict(black=30, red=31, green=32, yellow=33,
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blue=34, purple=35, cyan=36, white=37,
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Black=40, Red=41, Green=42, Yellow=43,
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Blue=44, Purple=45, Cyan=46, White=47,
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bold=1, light=2, blink=5, invert=7)
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# XXX deprecate stringio argument
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def __init__(self, file=None, stringio=False, encoding=None):
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if file is None:
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if stringio:
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self.stringio = file = py.io.TextIO()
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else:
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from sys import stdout as file
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elif py.builtin.callable(file) and not (
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hasattr(file, "write") and hasattr(file, "flush")):
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file = WriteFile(file, encoding=encoding)
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if hasattr(file, "isatty") and file.isatty() and colorama:
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file = colorama.AnsiToWin32(file).stream
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self.encoding = encoding or getattr(file, 'encoding', "utf-8")
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self._file = file
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self.hasmarkup = should_do_markup(file)
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self._lastlen = 0
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self._chars_on_current_line = 0
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self._width_of_current_line = 0
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@property
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def fullwidth(self):
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if hasattr(self, '_terminal_width'):
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return self._terminal_width
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return get_terminal_width()
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@fullwidth.setter
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def fullwidth(self, value):
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self._terminal_width = value
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@property
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def chars_on_current_line(self):
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"""Return the number of characters written so far in the current line.
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Please note that this count does not produce correct results after a reline() call,
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see #164.
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.. versionadded:: 1.5.0
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:rtype: int
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"""
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return self._chars_on_current_line
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@property
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def width_of_current_line(self):
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"""Return an estimate of the width so far in the current line.
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.. versionadded:: 1.6.0
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:rtype: int
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"""
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return self._width_of_current_line
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def _escaped(self, text, esc):
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if esc and self.hasmarkup:
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text = (''.join(['\x1b[%sm' % cod for cod in esc]) +
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text +'\x1b[0m')
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return text
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def markup(self, text, **kw):
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esc = []
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for name in kw:
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if name not in self._esctable:
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raise ValueError("unknown markup: %r" %(name,))
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if kw[name]:
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esc.append(self._esctable[name])
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return self._escaped(text, tuple(esc))
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def sep(self, sepchar, title=None, fullwidth=None, **kw):
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if fullwidth is None:
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fullwidth = self.fullwidth
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# the goal is to have the line be as long as possible
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# under the condition that len(line) <= fullwidth
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if sys.platform == "win32":
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# if we print in the last column on windows we are on a
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# new line but there is no way to verify/neutralize this
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# (we may not know the exact line width)
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# so let's be defensive to avoid empty lines in the output
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fullwidth -= 1
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if title is not None:
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# we want 2 + 2*len(fill) + len(title) <= fullwidth
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# i.e. 2 + 2*len(sepchar)*N + len(title) <= fullwidth
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# 2*len(sepchar)*N <= fullwidth - len(title) - 2
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# N <= (fullwidth - len(title) - 2) // (2*len(sepchar))
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N = max((fullwidth - len(title) - 2) // (2*len(sepchar)), 1)
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fill = sepchar * N
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line = "%s %s %s" % (fill, title, fill)
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else:
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# we want len(sepchar)*N <= fullwidth
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# i.e. N <= fullwidth // len(sepchar)
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line = sepchar * (fullwidth // len(sepchar))
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# in some situations there is room for an extra sepchar at the right,
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# in particular if we consider that with a sepchar like "_ " the
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# trailing space is not important at the end of the line
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if len(line) + len(sepchar.rstrip()) <= fullwidth:
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line += sepchar.rstrip()
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self.line(line, **kw)
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def write(self, msg, **kw):
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if msg:
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if not isinstance(msg, (bytes, text)):
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msg = text(msg)
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self._update_chars_on_current_line(msg)
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if self.hasmarkup and kw:
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markupmsg = self.markup(msg, **kw)
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else:
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markupmsg = msg
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write_out(self._file, markupmsg)
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def _update_chars_on_current_line(self, text_or_bytes):
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newline = b'\n' if isinstance(text_or_bytes, bytes) else '\n'
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current_line = text_or_bytes.rsplit(newline, 1)[-1]
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if isinstance(current_line, bytes):
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current_line = current_line.decode('utf-8', errors='replace')
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if newline in text_or_bytes:
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self._chars_on_current_line = len(current_line)
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self._width_of_current_line = get_line_width(current_line)
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else:
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self._chars_on_current_line += len(current_line)
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self._width_of_current_line += get_line_width(current_line)
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def line(self, s='', **kw):
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self.write(s, **kw)
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self._checkfill(s)
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self.write('\n')
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def reline(self, line, **kw):
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if not self.hasmarkup:
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raise ValueError("cannot use rewrite-line without terminal")
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self.write(line, **kw)
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self._checkfill(line)
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self.write('\r')
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self._lastlen = len(line)
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def _checkfill(self, line):
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diff2last = self._lastlen - len(line)
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if diff2last > 0:
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self.write(" " * diff2last)
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class Win32ConsoleWriter(TerminalWriter):
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def write(self, msg, **kw):
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if msg:
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if not isinstance(msg, (bytes, text)):
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msg = text(msg)
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self._update_chars_on_current_line(msg)
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oldcolors = None
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if self.hasmarkup and kw:
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handle = GetStdHandle(STD_OUTPUT_HANDLE)
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oldcolors = GetConsoleInfo(handle).wAttributes
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default_bg = oldcolors & 0x00F0
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attr = default_bg
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if kw.pop('bold', False):
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attr |= FOREGROUND_INTENSITY
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if kw.pop('red', False):
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attr |= FOREGROUND_RED
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elif kw.pop('blue', False):
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attr |= FOREGROUND_BLUE
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elif kw.pop('green', False):
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attr |= FOREGROUND_GREEN
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elif kw.pop('yellow', False):
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attr |= FOREGROUND_GREEN|FOREGROUND_RED
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else:
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attr |= oldcolors & 0x0007
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SetConsoleTextAttribute(handle, attr)
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write_out(self._file, msg)
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if oldcolors:
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SetConsoleTextAttribute(handle, oldcolors)
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class WriteFile(object):
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def __init__(self, writemethod, encoding=None):
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self.encoding = encoding
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self._writemethod = writemethod
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def write(self, data):
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if self.encoding:
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data = data.encode(self.encoding, "replace")
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self._writemethod(data)
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def flush(self):
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return
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if win32_and_ctypes:
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TerminalWriter = Win32ConsoleWriter
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import ctypes
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from ctypes import wintypes
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# ctypes access to the Windows console
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STD_OUTPUT_HANDLE = -11
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STD_ERROR_HANDLE = -12
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FOREGROUND_BLACK = 0x0000 # black text
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FOREGROUND_BLUE = 0x0001 # text color contains blue.
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FOREGROUND_GREEN = 0x0002 # text color contains green.
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FOREGROUND_RED = 0x0004 # text color contains red.
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FOREGROUND_WHITE = 0x0007
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FOREGROUND_INTENSITY = 0x0008 # text color is intensified.
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BACKGROUND_BLACK = 0x0000 # background color black
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BACKGROUND_BLUE = 0x0010 # background color contains blue.
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BACKGROUND_GREEN = 0x0020 # background color contains green.
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BACKGROUND_RED = 0x0040 # background color contains red.
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BACKGROUND_WHITE = 0x0070
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BACKGROUND_INTENSITY = 0x0080 # background color is intensified.
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SHORT = ctypes.c_short
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class COORD(ctypes.Structure):
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_fields_ = [('X', SHORT),
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('Y', SHORT)]
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class SMALL_RECT(ctypes.Structure):
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_fields_ = [('Left', SHORT),
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('Top', SHORT),
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('Right', SHORT),
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('Bottom', SHORT)]
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class CONSOLE_SCREEN_BUFFER_INFO(ctypes.Structure):
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_fields_ = [('dwSize', COORD),
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('dwCursorPosition', COORD),
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('wAttributes', wintypes.WORD),
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('srWindow', SMALL_RECT),
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('dwMaximumWindowSize', COORD)]
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_GetStdHandle = ctypes.windll.kernel32.GetStdHandle
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_GetStdHandle.argtypes = [wintypes.DWORD]
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_GetStdHandle.restype = wintypes.HANDLE
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def GetStdHandle(kind):
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return _GetStdHandle(kind)
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SetConsoleTextAttribute = ctypes.windll.kernel32.SetConsoleTextAttribute
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SetConsoleTextAttribute.argtypes = [wintypes.HANDLE, wintypes.WORD]
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SetConsoleTextAttribute.restype = wintypes.BOOL
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_GetConsoleScreenBufferInfo = \
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ctypes.windll.kernel32.GetConsoleScreenBufferInfo
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_GetConsoleScreenBufferInfo.argtypes = [wintypes.HANDLE,
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ctypes.POINTER(CONSOLE_SCREEN_BUFFER_INFO)]
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_GetConsoleScreenBufferInfo.restype = wintypes.BOOL
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def GetConsoleInfo(handle):
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info = CONSOLE_SCREEN_BUFFER_INFO()
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_GetConsoleScreenBufferInfo(handle, ctypes.byref(info))
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return info
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def _getdimensions():
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handle = GetStdHandle(STD_OUTPUT_HANDLE)
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info = GetConsoleInfo(handle)
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# Substract one from the width, otherwise the cursor wraps
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# and the ending \n causes an empty line to display.
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return info.dwSize.Y, info.dwSize.X - 1
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def write_out(fil, msg):
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# XXX sometimes "msg" is of type bytes, sometimes text which
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# complicates the situation. Should we try to enforce unicode?
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try:
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# on py27 and above writing out to sys.stdout with an encoding
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# should usually work for unicode messages (if the encoding is
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# capable of it)
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fil.write(msg)
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except UnicodeEncodeError:
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# on py26 it might not work because stdout expects bytes
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if fil.encoding:
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try:
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fil.write(msg.encode(fil.encoding))
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except UnicodeEncodeError:
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# it might still fail if the encoding is not capable
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pass
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else:
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fil.flush()
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return
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# fallback: escape all unicode characters
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msg = msg.encode("unicode-escape").decode("ascii")
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fil.write(msg)
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fil.flush()
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