curses and use_default_colors()

Re: curses and use_default_col ors()

Brian Victor <[email protected] > wrote in message news:<slrnbidnj [email protected] phia.net>...[color=blue]
> I am attempting to write a curses-based program. I would like to use
> the default terminal background rather than a black one (a significant
> difference with transluscent terminals, regardless of one's opinion of
> them).[/color]
<snip>

I don't know how much this'll help, but my home-brewed curses TextApp
class has a white-on-blue default, and TextApp.startWi n() contains
these lines (inter alia) ...

# ... blah, blah, blah.
curses.start_co lor()
curses.init_pai r(1, curses.COLOR_WH ITE, curses.COLOR_BL UE)
# ... blah, blah, blah ...
self.scrn = self.stdscr.sub win(self.height , self.width, 0, 0)
self.scrn.bkgd( curses.color_pa ir(1))
# Blah, blah, blah ...

Fwiw

Chris

Re: curses and use_default_col ors()

Chris Reay wrote:[color=blue]
> Brian Victor <[email protected] > wrote in message
> news:<slrnbidnj [email protected] phia.net>...[color=green]
>> I am attempting to write a curses-based program. I would like to use
>> the default terminal background rather than a black one (a significant
>> difference with transluscent terminals, regardless of one's opinion of
>> them).[/color]
> I don't know how much this'll help, but my home-brewed curses TextApp
> class has a white-on-blue default, and TextApp.startWi n() contains
> these lines (inter alia) ...[/color]
[snip]

Thanks, but that's not quite what I'm looking for. Getting a solid
background isn't a problem. Getting a subtly textured background to
show through (or other windows on Mac) seems to be a bit tricker.

Still hoping someone will hop in with "just use this curses extension"
or "you can write a wrapper around that one function and integrate it
with python's curses like this." But thanks for the input, anyway!

--
Brian

Re: curses and use_default_col ors()

Brian Victor wrote:[color=blue]
> Still hoping someone will hop in with "just use this curses extension"
> or "you can write a wrapper around that one function and integrate it
> with python's curses like this." But thanks for the input, anyway![/color]

I guess that someone is me. I love replying to my own posts...

I just hacked this bit of code up and it seems to do the trick.
importing usedefault and calling usedefault.use_ default_colors( ) sets
color pair 0 to use the default colors for the terminal. This allows
translucency on terminals that support it. The packaging could use some
work, but the following should be enough to get future readers going.

This is the first C extension I've written, and it's almost straight
from the docs. If anyone has any pointers, I'd be happy to hear them.

usedefault.c
#v+
#include <Python.h>
#include <ncurses.h>

static PyObject *
pyuse_default_c olors(PyObject *self, PyObject *args)
{
use_default_col ors();
Py_INCREF(Py_No ne);
return Py_None;
}

static PyMethodDef SpamMethods[] = {
{"use_default_c olors", pyuse_default_c olors, METH_VARARGS,
"Use Default Colors."},
{NULL, NULL, 0, NULL} /* Sentinel */
};

/* PyMODINIT_FUNC */
/* The docs say to use the above, but it doesn't exist in my copy of
* Python.h. */
void initusedefault( )
{
(void) Py_InitModule(" usedefault", SpamMethods);
}
#v-

setup.py
#v+
from distutils.core import setup, Extension

module1 = Extension('used efault',
libraries = ["ncurses"],
sources = ['usedefault.c'])

setup (name = 'usedefault',
version = '1.0',
description = 'Use default colors in curses',
ext_modules = [module1])
#v-

--
Brian

Re: curses and use_default_col ors()

On Wed, 30 Jul 2003 17:34:29 GMT,
Brian Victor <[email protected] > wrote:[color=blue]
> static PyObject *
> pyuse_default_c olors(PyObject *self, PyObject *args)
> {
> use_default_col ors();
> Py_INCREF(Py_No ne);
> return Py_None;
> }
>
> static PyMethodDef SpamMethods[] = {
> {"use_default_c olors", pyuse_default_c olors, METH_VARARGS,
> "Use Default Colors."},
> {NULL, NULL, 0, NULL} /* Sentinel */[/color]

Use METH_NOARGS instead of METH_VARARGS; as written, this code will accept
any number of arguments to the Python use_default_col ors() method and not
raise any error. An alternative would be to leave METH_VARARGS and put "if
(!PyArg_NoArgs( args)) return NULL;" in pyuse_default_c olors(); this would
work with older versions of Python at the cost of being slightly slower.

I'll add this function to the curses module, so at least it'll be in 2.4;
thanks for writing it. Anyone know if it's possible to test it on MacOS X?
Does the Terminal support transparency?

--amk
[color=blue]
> };
>
> /* PyMODINIT_FUNC */
> /* The docs say to use the above, but it doesn't exist in my copy of
> * Python.h. */
> void initusedefault( )
> {
> (void) Py_InitModule(" usedefault", SpamMethods);
> }
> #v-
>
> setup.py
> #v+
> from distutils.core import setup, Extension
>
> module1 = Extension('used efault',
> libraries = ["ncurses"],
> sources = ['usedefault.c'])
>
> setup (name = 'usedefault',
> version = '1.0',
> description = 'Use default colors in curses',
> ext_modules = [module1])
> #v-
>[/color]

Re: curses and use_default_col ors()

Brian Victor wrote:[color=blue]
> Interestingly, both Terminal and iTerm seem to make everything
> transparent, so use_default_col ors has no significant effect. That is,
> a black background is indistinguishab le from a transparent/default
> background.[/color]

I forgot to mention that I hit a compile error on OSX's ncurses header
file. I believe it came from the December dev tools. It dealt with
redefining wchar_t:

#ifndef _WCHAR_T
typedef unsigned long wchar_t;
#endif /* _WCHAR_T */

I have no idea why the mac version does that (fink's does also). My
linux copy of the headers has nothing like that. #defining _WCHAR_T
before including ncurses.h fixed that, but I don't know if that's a
permanent solution. FWIW, I was doing this with python 2.3a1.

--
Brian