Reapply r106708 "Include initial use of colorama"

third_party/colorama/README.txt

+Download and docs:
+    http://pypi.python.org/pypi/colorama
+Development:
+    http://code.google.com/p/colorama
+
+Description
+===========
+
+Makes ANSI escape character sequences, for producing colored terminal text and
+cursor positioning, work under MS Windows.
+
+ANSI escape character sequences have long been used to produce colored terminal
+text and cursor positioning on Unix and Macs. Colorama makes this work on
+Windows, too. It also provides some shortcuts to help generate ANSI sequences,
+and works fine in conjunction with any other ANSI sequence generation library,
+such as Termcolor (http://pypi.python.org/pypi/termcolor.)
+
+This has the upshot of providing a simple cross-platform API for printing
+colored terminal text from Python, and has the happy side-effect that existing
+applications or libraries which use ANSI sequences to produce colored output on
+Linux or Macs can now also work on Windows, simply by calling
+``colorama.init()``.
+
+Demo scripts in the source code repository prints some colored text using
+ANSI sequences. Compare their output under Gnome-terminal's built in ANSI
+handling, versus on Windows Command-Prompt using Colorama:
+
+.. image:: http://colorama.googlecode.com/hg/screenshots/ubuntu-demo.png
+    :width: 661
+    :height: 357
+    :alt: ANSI sequences on Ubuntu under gnome-terminal.
+
+.. image:: http://colorama.googlecode.com/hg/screenshots/windows-demo.png
+    :width: 668
+    :height: 325
+    :alt: Same ANSI sequences on Windows, using Colorama.
+
+These screengrabs show that Colorama on Windows does not support ANSI 'dim
+text': it looks the same as 'normal text'.
+
+
+Dependencies
+============
+
+None, other than Python. Tested on Python 2.5.5, 2.6.5, 2.7, 3.1.2, and 3.2
+
+
+Usage
+=====
+
+Initialisation
+--------------
+
+Applications should initialise Colorama using::
+
+    from colorama import init
+    init()
+
+If you are on Windows, the call to ``init()`` will start filtering ANSI escape
+sequences out of any text sent to stdout or stderr, and will replace them with
+equivalent Win32 calls.
+
+Calling ``init()`` has no effect on other platforms (unless you request other
+optional functionality, see keyword args below.) The intention is that
+applications can call ``init()`` unconditionally on all platforms, after which
+ANSI output should just work.
+
+To stop using colorama before your program exits, simply call ``deinit()``.
+This will restore stdout and stderr to their original values, so that Colorama
+is disabled. To start using Colorama again, call ``reinit()``, which wraps
+stdout and stderr again, but is cheaper to call than doing ``init()`` all over
+again.
+
+
+Colored Output
+--------------
+
+Cross-platform printing of colored text can then be done using Colorama's
+constant shorthand for ANSI escape sequences::
+
+    from colorama import Fore, Back, Style
+    print Fore.RED + 'some red text'
+    print Back.GREEN + and with a green background'
+    print Style.DIM + 'and in dim text'
+    print + Fore.RESET + Back.RESET + Style.RESET_ALL
+    print 'back to normal now'
+
+or simply by manually printing ANSI sequences from your own code::
+
+    print '/033[31m' + 'some red text'
+    print '/033[30m' # and reset to default color
+
+or Colorama can be used happily in conjunction with existing ANSI libraries
+such as Termcolor::
+
+    from colorama import init
+    from termcolor import colored
+
+    # use Colorama to make Termcolor work on Windows too
+    init()
+
+    # then use Termcolor for all colored text output
+    print colored('Hello, World!', 'green', 'on_red')
+
+Available formatting constants are::
+
+    Fore: BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE, RESET.
+    Back: BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE, RESET.
+    Style: DIM, NORMAL, BRIGHT, RESET_ALL
+
+Style.RESET_ALL resets foreground, background and brightness. Colorama will
+perform this reset automatically on program exit.
+
+
+Cursor Positioning
+------------------
+
+ANSI codes to reposition the cursor are supported. See demos/demo06.py for
+an example of how to generate them.
+
+
+Init Keyword Args
+-----------------
+
+``init()`` accepts some kwargs to override default behaviour.
+
+init(autoreset=False):
+    If you find yourself repeatedly sending reset sequences to turn off color
+    changes at the end of every print, then ``init(autoreset=True)`` will
+    automate that::
+
+        from colorama import init
+        init(autoreset=True)
+        print Fore.RED + 'some red text'
+        print 'automatically back to default color again'
+
+init(strip=None):
+    Pass ``True`` or ``False`` to override whether ansi codes should be
+    stripped from the output. The default behaviour is to strip if on Windows.
+
+init(convert=None):
+    Pass ``True`` or ``False`` to override whether to convert ansi codes in the
+    output into win32 calls. The default behaviour is to convert if on Windows
+    and output is to a tty (terminal).
+
+init(wrap=True):
+    On Windows, colorama works by replacing ``sys.stdout`` and ``sys.stderr``
+    with proxy objects, which override the .write() method to do their work. If
+    this wrapping causes you problems, then this can be disabled by passing
+    ``init(wrap=False)``. The default behaviour is to wrap if autoreset or
+    strip or convert are True.
+
+    When wrapping is disabled, colored printing on non-Windows platforms will
+    continue to work as normal. To do cross-platform colored output, you can
+    use Colorama's ``AnsiToWin32`` proxy directly::
+
+        from colorama import init, AnsiToWin32
+        init(wrap=False)
+        stream = AnsiToWin32(sys.stderr).stream
+        print >>stream, Fore.BLUE + 'blue text on stderr'    
+
+
+Status & Known Problems
+=======================
+
+I've personally only tested it on WinXP (CMD, Console2) and Ubuntu
+(gnome-terminal, xterm), although it sounds like others are using it on other
+platforms too.
+
+See outstanding issues and wishlist at:
+http://code.google.com/p/colorama/issues/list
+
+If anything doesn't work for you, or doesn't do what you expected or hoped for,
+I'd *love* to hear about it on that issues list.
+
+
+Recognised ANSI Sequences
+=========================
+
+ANSI sequences generally take the form:
+
+    ESC [ <param> ; <param> ... <command>
+
+Where <param> is an integer, and <command> is a single letter. Zero or more 
+params are passed to a <command>. If no params are passed, it is generally
+synonymous with passing a single zero. No spaces exist in the sequence, they
+have just been inserted here to make it easy to read.
+
+The only ANSI sequences that colorama converts into win32 calls are::
+
+    ESC [ 0 m       # reset all (colors and brightness)
+    ESC [ 1 m       # bright
+    ESC [ 2 m       # dim (looks same as normal brightness)
+    ESC [ 22 m      # normal brightness
+
+    # FOREGROUND:
+    ESC [ 30 m      # black
+    ESC [ 31 m      # red
+    ESC [ 32 m      # green
+    ESC [ 33 m      # yellow
+    ESC [ 34 m      # blue
+    ESC [ 35 m      # magenta
+    ESC [ 36 m      # cyan
+    ESC [ 37 m      # white
+    ESC [ 39 m      # reset
+
+    # BACKGROUND
+    ESC [ 40 m      # black
+    ESC [ 41 m      # red
+    ESC [ 42 m      # green
+    ESC [ 43 m      # yellow
+    ESC [ 44 m      # blue
+    ESC [ 45 m      # magenta
+    ESC [ 46 m      # cyan
+    ESC [ 47 m      # white
+    ESC [ 49 m      # reset
+
+    # cursor positioning
+    ESC [ x;y H     # position cursor at x,y
+
+    # clear the screen
+    ESC [ mode J    # clear the screen. Only mode 2 (clear entire screen)
+                    # is supported. It should be easy to add other modes,
+                    # let me know if that would be useful.
+
+Multiple numeric params to the 'm' command can be combined into a single
+sequence, eg::
+
+    ESC [ 36 ; 45 ; 1 m     # bright cyan text on magenta background
+
+All other ANSI sequences of the form ``ESC [ <param> ; <param> ... <command>``
+are silently stripped from the output on Windows.
+
+Any other form of ANSI sequence, such as single-character codes or alternative
+initial characters, are not recognised nor stripped. It would be cool to add
+them though. Let me know if it would be useful for you, via the issues on
+google code.
+
+
+Development
+===========
+
+Running tests requires:
+
+- Michael Foord's 'mock' module to be installed.
+- Tests are written using the 2010 era updates to 'unittest', and require to
+  be run either using Python2.7 or greater, or else to have Michael Foord's
+  'unittest2' module installed.
+
+unittest2 test discovery doesn't work for colorama, so I use 'nose'::
+
+    nosetests -s
+
+The -s is required because 'nosetests' otherwise applies a proxy of its own to
+stdout, which confuses the unit tests.
+
+
+Thanks
+======
+Daniel Griffith for multiple fabulous patches.
+Oscar Lesta for valuable fix to stop ANSI chars being sent to non-tty output.
+Roger Binns, for many suggestions, valuable feedback, & bug reports.
+Tim Golden for thought and much appreciated feedback on the initial idea.
+