122 lines
5.3 KiB
C
122 lines
5.3 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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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.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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static struct CanColor {
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bool once;
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bool result;
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struct OldNtConsole {
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unsigned codepage;
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unsigned mode;
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int64_t handle;
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} oldin, oldout;
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} g_cancolor;
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static textwindows void restorecmdexe(void) {
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if (g_cancolor.oldin.handle) {
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SetConsoleCP(g_cancolor.oldin.codepage);
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SetConsoleMode(g_cancolor.oldin.handle, g_cancolor.oldin.mode);
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}
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if (g_cancolor.oldout.handle) {
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SetConsoleOutputCP(g_cancolor.oldout.codepage);
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SetConsoleMode(g_cancolor.oldout.handle, g_cancolor.oldout.mode);
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}
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}
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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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int64_t handle;
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const char *term;
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if (g_cancolor.once) return g_cancolor.result;
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g_cancolor.once = true;
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if (IsWindows()) {
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if ((int)weakaddr("v_ntsubsystem") == kNtImageSubsystemWindowsCui &&
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NtGetVersion() >= kNtVersionWindows10) {
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atexit(restorecmdexe);
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if (GetFileType((handle = g_fds.p[STDIN_FILENO].handle)) ==
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kNtFileTypeChar) {
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g_cancolor.result = true;
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g_cancolor.oldin.handle = handle;
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g_cancolor.oldin.codepage = GetConsoleCP();
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SetConsoleCP(kNtCpUtf8);
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GetConsoleMode(handle, &g_cancolor.oldin.mode);
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SetConsoleMode(handle, g_cancolor.oldin.mode | kNtEnableProcessedInput |
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kNtEnableVirtualTerminalInput);
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}
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if (GetFileType((handle = g_fds.p[STDOUT_FILENO].handle)) ==
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kNtFileTypeChar ||
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GetFileType((handle = g_fds.p[STDERR_FILENO].handle)) ==
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kNtFileTypeChar) {
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g_cancolor.result = true;
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g_cancolor.oldout.handle = handle;
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g_cancolor.oldout.codepage = GetConsoleOutputCP();
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SetConsoleOutputCP(kNtCpUtf8);
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GetConsoleMode(handle, &g_cancolor.oldout.mode);
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SetConsoleMode(handle, g_cancolor.oldout.mode |
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kNtEnableProcessedOutput |
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kNtEnableVirtualTerminalProcessing);
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}
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}
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}
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if (!g_cancolor.result) {
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if ((term = getenv("TERM"))) {
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/* anything but emacs basically */
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g_cancolor.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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g_cancolor.result = IsXnu();
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}
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}
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return g_cancolor.result;
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}
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