mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-03-03 07:29:23 +00:00
23d333c090
This change includes many bug fixes, for the NT polyfills, strings, memory, boot, and math libraries which were discovered by adding more tools for recreational programming, such as PC emulation. Lemon has also been vendored because it works so well at parsing languages.
73 lines
3.5 KiB
C
73 lines
3.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ This program is free software; you can redistribute it and/or modify │
|
|
│ it under the terms of the GNU General Public License as published by │
|
|
│ the Free Software Foundation; version 2 of the License. │
|
|
│ │
|
|
│ This program is distributed in the hope that it will be useful, but │
|
|
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
|
|
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
|
|
│ General Public License for more details. │
|
|
│ │
|
|
│ You should have received a copy of the GNU General Public License │
|
|
│ along with this program; if not, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/bits/weaken.h"
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/log/log.h"
|
|
#include "libc/nt/console.h"
|
|
#include "libc/nt/enum/consolemodeflags.h"
|
|
#include "libc/nt/enum/filetype.h"
|
|
#include "libc/nt/enum/version.h"
|
|
#include "libc/nt/files.h"
|
|
#include "libc/nt/pedef.h"
|
|
#include "libc/nt/runtime.h"
|
|
#include "libc/nt/struct/teb.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/consts/fileno.h"
|
|
|
|
/**
|
|
* Returns true if ANSI terminal colors are appropriate.
|
|
*
|
|
* We take an optimistic approach here. We use colors, unless we see the
|
|
* environment variable TERM=dumb, which is set by software like Emacs.
|
|
* It's a common antipattern to check isatty(STDERR_FILENO), since that
|
|
* usually makes colors harder to get than they are to remove:
|
|
*
|
|
* sed 's/\x1b\[[;[:digit:]]*m//g' <color.txt >uncolor.txt
|
|
*
|
|
* Ideally, all software should be updated to understand color, since
|
|
* it's been formally standardized nearly as long as ASCII. Even old
|
|
* MS-DOS supports it (but Windows didn't until Windows 10) yet even
|
|
* tools like less may need wrapper scripts, e.g.:
|
|
*
|
|
* #!/bin/sh
|
|
* LESSCHARSET=UTF-8 exec /usr/bin/less -RS "$@"
|
|
*
|
|
* It's that easy fam.
|
|
*/
|
|
bool cancolor(void) {
|
|
static bool once;
|
|
static bool result;
|
|
const char *term;
|
|
if (!once) {
|
|
if (!result) {
|
|
if ((term = getenv("TERM"))) {
|
|
/* anything but emacs basically */
|
|
result = strcmp(term, "dumb") != 0;
|
|
} else {
|
|
/* TODO(jart): Why does Mac bash login shell exec nuke TERM? */
|
|
result = IsXnu();
|
|
}
|
|
}
|
|
once = true;
|
|
}
|
|
return result;
|
|
}
|