зеркало из https://github.com/microsoft/clang-1.git
228 строки
8.7 KiB
Python
228 строки
8.7 KiB
Python
#!/usr/bin/python
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# Source: http://code.activestate.com/recipes/475116/, with
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# modifications by Daniel Dunbar.
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import sys, re, time
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class TerminalController:
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"""
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A class that can be used to portably generate formatted output to
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a terminal.
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`TerminalController` defines a set of instance variables whose
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values are initialized to the control sequence necessary to
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perform a given action. These can be simply included in normal
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output to the terminal:
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>>> term = TerminalController()
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>>> print 'This is '+term.GREEN+'green'+term.NORMAL
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Alternatively, the `render()` method can used, which replaces
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'${action}' with the string required to perform 'action':
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>>> term = TerminalController()
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>>> print term.render('This is ${GREEN}green${NORMAL}')
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If the terminal doesn't support a given action, then the value of
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the corresponding instance variable will be set to ''. As a
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result, the above code will still work on terminals that do not
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support color, except that their output will not be colored.
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Also, this means that you can test whether the terminal supports a
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given action by simply testing the truth value of the
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corresponding instance variable:
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>>> term = TerminalController()
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>>> if term.CLEAR_SCREEN:
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... print 'This terminal supports clearning the screen.'
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Finally, if the width and height of the terminal are known, then
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they will be stored in the `COLS` and `LINES` attributes.
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"""
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# Cursor movement:
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BOL = '' #: Move the cursor to the beginning of the line
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UP = '' #: Move the cursor up one line
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DOWN = '' #: Move the cursor down one line
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LEFT = '' #: Move the cursor left one char
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RIGHT = '' #: Move the cursor right one char
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# Deletion:
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CLEAR_SCREEN = '' #: Clear the screen and move to home position
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CLEAR_EOL = '' #: Clear to the end of the line.
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CLEAR_BOL = '' #: Clear to the beginning of the line.
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CLEAR_EOS = '' #: Clear to the end of the screen
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# Output modes:
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BOLD = '' #: Turn on bold mode
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BLINK = '' #: Turn on blink mode
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DIM = '' #: Turn on half-bright mode
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REVERSE = '' #: Turn on reverse-video mode
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NORMAL = '' #: Turn off all modes
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# Cursor display:
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HIDE_CURSOR = '' #: Make the cursor invisible
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SHOW_CURSOR = '' #: Make the cursor visible
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# Terminal size:
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COLS = None #: Width of the terminal (None for unknown)
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LINES = None #: Height of the terminal (None for unknown)
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# Foreground colors:
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BLACK = BLUE = GREEN = CYAN = RED = MAGENTA = YELLOW = WHITE = ''
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# Background colors:
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BG_BLACK = BG_BLUE = BG_GREEN = BG_CYAN = ''
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BG_RED = BG_MAGENTA = BG_YELLOW = BG_WHITE = ''
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_STRING_CAPABILITIES = """
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BOL=cr UP=cuu1 DOWN=cud1 LEFT=cub1 RIGHT=cuf1
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CLEAR_SCREEN=clear CLEAR_EOL=el CLEAR_BOL=el1 CLEAR_EOS=ed BOLD=bold
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BLINK=blink DIM=dim REVERSE=rev UNDERLINE=smul NORMAL=sgr0
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HIDE_CURSOR=cinvis SHOW_CURSOR=cnorm""".split()
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_COLORS = """BLACK BLUE GREEN CYAN RED MAGENTA YELLOW WHITE""".split()
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_ANSICOLORS = "BLACK RED GREEN YELLOW BLUE MAGENTA CYAN WHITE".split()
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def __init__(self, term_stream=sys.stdout):
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"""
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Create a `TerminalController` and initialize its attributes
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with appropriate values for the current terminal.
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`term_stream` is the stream that will be used for terminal
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output; if this stream is not a tty, then the terminal is
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assumed to be a dumb terminal (i.e., have no capabilities).
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"""
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# Curses isn't available on all platforms
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try: import curses
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except: return
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# If the stream isn't a tty, then assume it has no capabilities.
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if not term_stream.isatty(): return
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# Check the terminal type. If we fail, then assume that the
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# terminal has no capabilities.
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try: curses.setupterm()
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except: return
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# Look up numeric capabilities.
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self.COLS = curses.tigetnum('cols')
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self.LINES = curses.tigetnum('lines')
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# Look up string capabilities.
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for capability in self._STRING_CAPABILITIES:
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(attrib, cap_name) = capability.split('=')
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setattr(self, attrib, self._tigetstr(cap_name) or '')
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# Colors
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set_fg = self._tigetstr('setf')
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if set_fg:
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for i,color in zip(range(len(self._COLORS)), self._COLORS):
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setattr(self, color, curses.tparm(set_fg, i) or '')
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set_fg_ansi = self._tigetstr('setaf')
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if set_fg_ansi:
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for i,color in zip(range(len(self._ANSICOLORS)), self._ANSICOLORS):
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setattr(self, color, curses.tparm(set_fg_ansi, i) or '')
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set_bg = self._tigetstr('setb')
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if set_bg:
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for i,color in zip(range(len(self._COLORS)), self._COLORS):
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setattr(self, 'BG_'+color, curses.tparm(set_bg, i) or '')
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set_bg_ansi = self._tigetstr('setab')
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if set_bg_ansi:
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for i,color in zip(range(len(self._ANSICOLORS)), self._ANSICOLORS):
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setattr(self, 'BG_'+color, curses.tparm(set_bg_ansi, i) or '')
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def _tigetstr(self, cap_name):
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# String capabilities can include "delays" of the form "$<2>".
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# For any modern terminal, we should be able to just ignore
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# these, so strip them out.
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import curses
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cap = curses.tigetstr(cap_name) or ''
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return re.sub(r'\$<\d+>[/*]?', '', cap)
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def render(self, template):
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"""
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Replace each $-substitutions in the given template string with
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the corresponding terminal control string (if it's defined) or
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'' (if it's not).
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"""
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return re.sub(r'\$\$|\${\w+}', self._render_sub, template)
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def _render_sub(self, match):
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s = match.group()
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if s == '$$': return s
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else: return getattr(self, s[2:-1])
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#######################################################################
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# Example use case: progress bar
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#######################################################################
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class ProgressBar:
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"""
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A 3-line progress bar, which looks like::
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Header
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20% [===========----------------------------------]
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progress message
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The progress bar is colored, if the terminal supports color
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output; and adjusts to the width of the terminal.
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"""
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BAR = '%s${GREEN}[${BOLD}%s%s${NORMAL}${GREEN}]${NORMAL}%s\n'
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HEADER = '${BOLD}${CYAN}%s${NORMAL}\n\n'
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def __init__(self, term, header, useETA=True):
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self.term = term
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if not (self.term.CLEAR_EOL and self.term.UP and self.term.BOL):
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raise ValueError("Terminal isn't capable enough -- you "
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"should use a simpler progress dispaly.")
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self.width = self.term.COLS or 75
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self.bar = term.render(self.BAR)
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self.header = self.term.render(self.HEADER % header.center(self.width))
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self.cleared = 1 #: true if we haven't drawn the bar yet.
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self.useETA = useETA
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if self.useETA:
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self.startTime = time.time()
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self.update(0, '')
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def update(self, percent, message):
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if self.cleared:
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sys.stdout.write(self.header)
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self.cleared = 0
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prefix = '%3d%% ' % (percent*100,)
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suffix = ''
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if self.useETA:
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elapsed = time.time() - self.startTime
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if percent > .0001 and elapsed > 1:
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total = elapsed / percent
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eta = int(total - elapsed)
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h = eta//3600.
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m = (eta//60) % 60
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s = eta % 60
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suffix = ' ETA: %02d:%02d:%02d'%(h,m,s)
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barWidth = self.width - len(prefix) - len(suffix) - 2
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n = int(barWidth*percent)
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if len(message) < self.width:
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message = message + ' '*(self.width - len(message))
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else:
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message = '... ' + message[-(self.width-4):]
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sys.stdout.write(
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self.term.BOL + self.term.UP + self.term.CLEAR_EOL +
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(self.bar % (prefix, '='*n, '-'*(barWidth-n), suffix)) +
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self.term.CLEAR_EOL + message)
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def clear(self):
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if not self.cleared:
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sys.stdout.write(self.term.BOL + self.term.CLEAR_EOL +
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self.term.UP + self.term.CLEAR_EOL +
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self.term.UP + self.term.CLEAR_EOL)
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self.cleared = 1
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def test():
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import time
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tc = TerminalController()
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p = ProgressBar(tc, 'Tests')
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for i in range(101):
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p.update(i/100., str(i))
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time.sleep(.3)
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if __name__=='__main__':
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test()
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