Python食谱-1.25.在Unix终端上格式化显示HTML文本

By digitalsatori on 十月 14th, 2009

原文作者:	Brent Burley, Mark Moraes
中文翻译:	Tony (digitalsatori)

问题

如何才能在Unix终端上显示HTML文本，使其可以表现粗体和下划线。

解决方案

最简单的方法是编制一个过滤脚本，从标准输入获取HTML然后在标准输出文本和终端控制符。因为本配方针对得唯一对象是Unix, 我们可以通过Unix命令 tput 来获取需要的终端控制符。具体方法是使用Python标准库中os模块中得popen函数来启动tput。

#!/usr/bin/env python
import sys, os, htmllib, formatter
# use Unix tput to get the escape sequences for bold, underline, reset
set_bold = os.popen('tput bold').read( )
set_underline = os.popen('tput smul').read( )
perform_reset = os.popen('tput sgr0').read( )
class TtyFormatter(formatter.AbstractFormatter):
    ''' a formatter that keeps track of bold and italic font states, and
        emits terminal control sequences accordingly.
    '''
    def _ _init_ _(self, writer):
        # first, as usual, initialize the superclass
        formatter.AbstractFormatter._ _init_ _(self, writer)
        # start with neither bold nor italic, and no saved font state
        self.fontState = False, False
        self.fontStack = [  ]
    def push_font(self, font):
        # the `font' tuple has four items, we only track the two flags
        # about whether italic and bold are active or not
        size, is_italic, is_bold, is_tt = font
        self.fontStack.append((is_italic, is_bold))
        self._updateFontState( )
    def pop_font(self, *args):
        # go back to previous font state
        try:
            self.fontStack.pop( )
        except IndexError:
            pass
        self._updateFontState( )
    def updateFontState(self):
        # emit appropriate terminal control sequences if the state of
        # bold and/or italic(==underline) has just changed
        try:
            newState = self.fontStack[-1]
        except IndexError:
            newState = False, False
        if self.fontState != newState:
            # relevant state change: reset terminal
            print perform_reset,
            # set underine and/or bold if needed
            if newState[0]:
                print set_underline,
            if newState[1]:
                print set_bold,
            # remember the two flags as our current font-state
            self.fontState = newState
# make writer, formatter and parser objects, connecting them as needed
myWriter = formatter.DumbWriter( )
if sys.stdout.isatty( ):
    myFormatter = TtyFormatter(myWriter)
else:
    myFormatter = formatter.AbstractFormatter(myWriter)
myParser = htmllib.HTMLParser(myFormatter)
# feed all of standard input to the parser, then terminate operations
myParser.feed(sys.stdin.read( ))
myParser.close( )