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terminal.cpp
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// Copyright 2020 Arthur Sonzogni. All rights reserved.
// Use of this source code is governed by the MIT license that can be found in
// the LICENSE file.
#include <cstdlib> // for getenv
#include <string> // for string, allocator
#include "ftxui/screen/terminal.hpp"
#if defined(_WIN32)
#define WIN32_LEAN_AND_MEAN
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include <windows.h>
#else
#include <sys/ioctl.h> // for winsize, ioctl, TIOCGWINSZ
#include <unistd.h> // for STDOUT_FILENO
#endif
namespace ftxui {
namespace {
bool g_cached = false; // NOLINT
Terminal::Color g_cached_supported_color; // NOLINT
Dimensions& FallbackSize() {
#if defined(__EMSCRIPTEN__)
// This dimension was chosen arbitrarily to be able to display:
// https://arthursonzogni.com/FTXUI/examples
// This will have to be improved when someone has time to implement and need
// it.
constexpr int fallback_width = 140;
constexpr int fallback_height = 43;
#else
// The terminal size in VT100 was 80x24. It is still used nowadays by
// default in many terminal emulator. That's a good choice for a fallback
// value.
constexpr int fallback_width = 80;
constexpr int fallback_height = 24;
#endif
static Dimensions g_fallback_size{
fallback_width,
fallback_height,
};
return g_fallback_size;
}
const char* Safe(const char* c) {
return (c != nullptr) ? c : "";
}
bool Contains(const std::string& s, const char* key) {
return s.find(key) != std::string::npos;
}
Terminal::Color ComputeColorSupport() {
#if defined(__EMSCRIPTEN__)
return Terminal::Color::TrueColor;
#endif
std::string COLORTERM = Safe(std::getenv("COLORTERM")); // NOLINT
if (Contains(COLORTERM, "24bit") || Contains(COLORTERM, "truecolor")) {
return Terminal::Color::TrueColor;
}
std::string TERM = Safe(std::getenv("TERM")); // NOLINT
if (Contains(COLORTERM, "256") || Contains(TERM, "256")) {
return Terminal::Color::Palette256;
}
#if defined(FTXUI_MICROSOFT_TERMINAL_FALLBACK)
// Microsoft terminals do not properly declare themselve supporting true
// colors: https://github.com/microsoft/terminal/issues/1040
// As a fallback, assume microsoft terminal are the ones not setting those
// variables, and enable true colors.
if (TERM.empty() && COLORTERM.empty()) {
return Terminal::Color::TrueColor;
}
#endif
return Terminal::Color::Palette16;
}
} // namespace
namespace Terminal {
/// @brief Get the terminal size.
/// @return The terminal size.
/// @ingroup screen
Dimensions Size() {
#if defined(__EMSCRIPTEN__)
// This dimension was chosen arbitrarily to be able to display:
// https://arthursonzogni.com/FTXUI/examples
// This will have to be improved when someone has time to implement and need
// it.
return FallbackSize();
#elif defined(_WIN32)
CONSOLE_SCREEN_BUFFER_INFO csbi;
if (GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi)) {
return Dimensions{csbi.srWindow.Right - csbi.srWindow.Left + 1,
csbi.srWindow.Bottom - csbi.srWindow.Top + 1};
}
return FallbackSize();
#else
winsize w{};
const int status = ioctl(STDOUT_FILENO, TIOCGWINSZ, &w); // NOLINT
// The ioctl return value result should be checked. Some operating systems
// don't support TIOCGWINSZ.
if (w.ws_col == 0 || w.ws_row == 0 || status < 0) {
return FallbackSize();
}
return Dimensions{w.ws_col, w.ws_row};
#endif
}
/// @brief Override terminal size in case auto-detection fails
/// @param fallbackSize Terminal dimensions to fallback to
void SetFallbackSize(const Dimensions& fallbackSize) {
FallbackSize() = fallbackSize;
}
/// @brief Get the color support of the terminal.
/// @ingroup screen
Color ColorSupport() {
if (!g_cached) {
g_cached = true;
g_cached_supported_color = ComputeColorSupport();
}
return g_cached_supported_color;
}
/// @brief Override terminal color support in case auto-detection fails
/// @ingroup dom
void SetColorSupport(Color color) {
g_cached = true;
g_cached_supported_color = color;
}
} // namespace Terminal
} // namespace ftxui
ftxui::Terminal
Definition terminal.hpp:13
ftxui::Terminal::SetColorSupport
void SetColorSupport(Color color)
Override terminal color support in case auto-detection fails.
Definition terminal.cpp:140
ftxui::Terminal::SetFallbackSize
void SetFallbackSize(const Dimensions &fallbackSize)
Override terminal size in case auto-detection fails.
Definition terminal.cpp:124
ftxui::Terminal::Color
Color
Definition terminal.hpp:17
ftxui::Terminal::TrueColor
@ TrueColor
Definition terminal.hpp:21
ftxui::Terminal::Palette256
@ Palette256
Definition terminal.hpp:20
ftxui::Terminal::Palette16
@ Palette16
Definition terminal.hpp:19
ftxui::Terminal::Size
Dimensions Size()
Get the terminal size.
Definition terminal.cpp:94
ftxui::Terminal::ColorSupport
Color ColorSupport()
Get the color support of the terminal.
Definition terminal.cpp:130
ftxui
Definition animation.hpp:10
ftxui::color
Decorator color(Color)
Decorate using a foreground color.
Definition color.cpp:110
ftxui::Dimensions
Definition terminal.hpp:8
terminal.hpp