Highlight retracediff output.
diff --git a/scripts/highlight.py b/scripts/highlight.py
new file mode 100644
index 0000000..986bd1d
--- /dev/null
+++ b/scripts/highlight.py
@@ -0,0 +1,194 @@
+##########################################################################
+#
+# Copyright 2011 Jose Fonseca
+# Copyright 2008-2009 VMware, Inc.
+# All Rights Reserved.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+##########################################################################/
+
+
+import sys
+import platform
+
+
+class PlainHighlighter:
+ '''Plain formatter'''
+
+ black = None
+ red = None
+ green = None
+ yellow = None
+ blue = None
+ magenta = None
+ cyan = None
+ white = None
+
+ def __init__(self, stream):
+ self.stream = stream
+
+ def write(self, text):
+ self.stream.write(text)
+
+ def flush(self):
+ self.stream.flush()
+
+ def normal(self):
+ pass
+
+ def color(self, color):
+ pass
+
+ def bold(self):
+ pass
+
+ def italic(self):
+ pass
+
+
+class AnsiHighlighter(PlainHighlighter):
+ '''Highlighter for plain-text files which outputs ANSI escape codes. See
+ http://en.wikipedia.org/wiki/ANSI_escape_code for more information
+ concerning ANSI escape codes.
+ '''
+
+ _csi = '\33['
+
+ _normal = '0m'
+ _bold = '1m'
+ _italic = '3m'
+
+ black = 0
+ red = 1
+ green = 2
+ yellow = 3
+ blue = 4
+ magenta = 5
+ cyan = 6
+ white = 7
+
+ def __init__(self, stream):
+ PlainHighlighter.__init__(self, stream)
+ self.isatty = stream.isatty()
+
+ def _escape(self, code):
+ if self.isatty:
+ self.stream.write(self._csi + code)
+
+ def normal(self):
+ self._escape(self._normal)
+
+ def color(self, color):
+ self._escape(str(30 + color) + 'm')
+
+ def bold(self):
+ self._escape(self._bold)
+
+ def italic(self):
+ self._escape(self._italic)
+
+
+class WindowsConsoleHighlighter(PlainHighlighter):
+ '''Highlighter for the Windows Console. See
+ http://code.activestate.com/recipes/496901/ for more information.
+ '''
+
+ INVALID_HANDLE_VALUE = -1
+ STD_INPUT_HANDLE = -10
+ STD_OUTPUT_HANDLE = -11
+ STD_ERROR_HANDLE = -12
+
+ FOREGROUND_BLUE = 0x01
+ FOREGROUND_GREEN = 0x02
+ FOREGROUND_RED = 0x04
+ FOREGROUND_INTENSITY = 0x08
+ BACKGROUND_BLUE = 0x10
+ BACKGROUND_GREEN = 0x20
+ BACKGROUND_RED = 0x40
+ BACKGROUND_INTENSITY = 0x80
+
+ COMMON_LVB_LEADING_BYTE = 0x0100
+ COMMON_LVB_TRAILING_BYTE = 0x0200
+ COMMON_LVB_GRID_HORIZONTAL = 0x0400
+ COMMON_LVB_GRID_LVERTICAL = 0x0800
+ COMMON_LVB_GRID_RVERTICAL = 0x1000
+ COMMON_LVB_REVERSE_VIDEO = 0x4000
+ COMMON_LVB_UNDERSCORE = 0x8000
+
+ _normal = FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED
+ _bold = FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED | FOREGROUND_INTENSITY
+ _italic = FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED
+
+ black = 0
+ red = FOREGROUND_RED
+ green = FOREGROUND_GREEN
+ blue = FOREGROUND_BLUE
+ white = FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED
+
+ def __init__(self, stream):
+ PlainHighlighter.__init__(self, stream)
+
+ if stream is sys.stdin:
+ nStdHandle = self.STD_INPUT_HANDLE
+ elif stream is sys.stdout:
+ nStdHandle = self.STD_OUTPUT_HANDLE
+ elif stream is sys.stderr:
+ nStdHandle = self.STD_ERROR_HANDLE
+ else:
+ nStdHandle = None
+
+ if nStdHandle is not None:
+ import ctypes
+ self._handle = ctypes.windll.kernel32.GetStdHandle(nStdHandle)
+ else:
+ self._handle = INVALID_HANDLE_VALUE
+
+ self._attribute = self.white
+
+ def _setAttribute(self, attr):
+ if self._handle != INVALID_HANDLE_VALUE:
+ import ctypes
+ ctypes.windll.kernel32.SetConsoleTextAttribute(self._handle, attr)
+ self._attribute = attr
+
+ def normal(self):
+ self._setAttribute(self._normal)
+
+ def color(self, color):
+ intensity = self._attribute & FOREGROUND_INTENSITY
+ self._setAttribute(color | intensity)
+
+ def bold(self):
+ self._setAttribute(self._attribute | FOREGROUND_INTENSITY)
+
+ def italic(self):
+ pass
+
+
+def Highlighter(stream = sys.stdout):
+ if platform.system() == 'Windows':
+ return WindowsConsoleHighlighter(stream)
+ else:
+ return AnsiHighlighter(stream)
+
+
+__all__ = [
+ 'Highlighter',
+]