73 lines
3.4 KiB
C
73 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/weaken.h"
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/log/log.h"
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#include "libc/nt/console.h"
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#include "libc/nt/enum/consolemodeflags.h"
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#include "libc/nt/enum/filetype.h"
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#include "libc/nt/enum/version.h"
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#include "libc/nt/files.h"
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#include "libc/nt/pedef.internal.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/teb.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/fileno.h"
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/**
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* Returns true if ANSI terminal colors are appropriate.
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*
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* We take an optimistic approach here. We use colors, unless we see the
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* environment variable TERM=dumb, which is set by software like Emacs.
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* It's a common antipattern to check isatty(STDERR_FILENO), since that
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* usually makes colors harder to get than they are to remove:
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*
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* sed 's/\x1b\[[;[:digit:]]*m//g' <color.txt >uncolor.txt
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*
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* Ideally, all software should be updated to understand color, since
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* it's been formally standardized nearly as long as ASCII. Even old
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* MS-DOS supports it (but Windows didn't until Windows 10) yet even
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* tools like less may need wrapper scripts, e.g.:
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*
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* #!/bin/sh
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* LESSCHARSET=UTF-8 exec /usr/bin/less -RS "$@"
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*
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* It's that easy fam.
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*/
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bool cancolor(void) {
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static bool once;
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static bool result;
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const char *term;
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if (!once) {
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if (!result) {
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if ((term = getenv("TERM"))) {
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/* anything but emacs basically */
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result = strcmp(term, "dumb") != 0;
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} else {
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/* TODO(jart): Why does Mac bash login shell exec nuke TERM? */
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result = IsXnu();
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}
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}
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once = true;
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}
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return result;
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}
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