On 04/16/10 19:28, Jonathan Hartley wrote:
> I'm playing with ideas of what API to expose. My favourite one is to
> simply embed ANSI codes in the stream to be printed. Then this will
> work as-is on Mac and *nix. To make it work on Windows, printing could
> be done to a file0-like object which wraps stdout:
The problem with that is you're simply reinventing ANSI.SYS device driver.
An alternative API is you could override .__add__(), like so (completely
untested):
class Color(object):
def __init__(self, color):
self.color = map_the_color(color)
self.string = ""
def __add__(self, string):
self.string += string
return self
def __str__(self):
if terminal_can_do_ansi_color:
return ansicolorescape(self.string, self.color)
elif windows:
syscalltocolor(self.color)
print self.string
syscalltocolor(reset the color)
return ""
GREEN = Color('green')
print GREEN + "Great" + "Good"
you can even go a bit further and allow chained calls (again, completely
untested, but you get the idea):
class Color(object):
def __init__(self, color):
self.color = map_the_color(color)
self.stack = []
def __add__(self, string):
if isinstance(string, Color):
# not a string, chain the calls
self.stack.append((string.color, []]))
else:
# a string,
self.stack[-1][1].append(string)
return self
def __radd__(self, string):
self.stack.append([self.default, string])
return self
def __str__(self):
if ansi_capable:
return colorescape(format, string)
elif windows:
for format, string in self.stack:
syscalltocolor(color)
print string
return ""
GREEN = Color('green')
RED = Color('red')
print "Fairly" + GREEN + "Great" + RED + "Poor"
or something like that, and you will have an API that works
transparently on all platforms. The downside is that you cannot call
str(GREEN + "foo") on windows.
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