environment.cpp
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#include "crucible/core/environment.hpp"
#include "crucible/core/iterators.hpp"
#include "crucible/core/memory.hpp"
#include "crucible/core/string.hpp"
#ifdef CRUCIBLE_PLATFORM_IS_POSIX_LIKE
#include <unistd.h>
#endif // CRUCIBLE_PLATFORM_IS_POSIX_LIKE
#include <cstdio>
#include <cstdlib>
#include <mutex>
namespace crucible::core
{
namespace
{
[[nodiscard]] auto stdout_supports_color() -> bool
{
#ifdef CRUCIBLE_PLATFORM_IS_POSIX_LIKE
return ::isatty(::fileno(stdout));
#endif // CRUCIBLE_PLATFORM_IS_POSIX_LIKE
#ifdef CRUCIBLE_PLATFORM_IS_WINDOWS_LIKE
return false;
#endif // CRUCIBLE_PLATFORM_IS_WINDOWS_LIKE
}
}
struct Environment_Data
{};
Environment::Environment(std::unique_ptr<Environment_Data> data) :
m_data { std::move(data) }
{
}
auto Environment::initialize() -> void
{
initialize_colors();
}
auto Environment::initialize_colors() -> void
{
// See: https://no-color.org
char const *no_color { std::getenv("NO_COLOR") };
if (no_color != nullptr && no_color[0] != '\0') {
m_colors = false;
return;
}
// See: https://bixense.com/clicolors/
char const *clicolor_force { std::getenv("CLICOLOR_FORCE") };
if (clicolor_force != nullptr && clicolor_force[0] != '\0') {
m_colors = true;
return;
}
// Our own colorization mechanism
char const *crucible_colors_data { std::getenv("CRUCIBLE_COLORS") };
if (crucible_colors_data != nullptr) {
std::size_t const crucible_colors_size { std::strlen(crucible_colors_data) };
String_View const crucible_colors { crucible_colors_data, crucible_colors_size };
String_View const off_values[] { "0", "never", "NEVER", "false", "FALSE", "no", "NO", "off", "OFF" };
if (iterate(off_values).contains(crucible_colors)) {
m_colors = false;
return;
}
String_View const on_values[] { "1", "always", "ALWAYS", "true", "TRUE", "yes", "YES", "on", "ON" };
if (iterate(on_values).contains(crucible_colors)) {
m_colors = true;
return;
}
String_View const auto_values[] { "auto", "AUTO", "automatic", "AUTOMATIC", "detect", "DETECT" };
if (iterate(auto_values).contains(crucible_colors)) {
m_colors = stdout_supports_color();
return;
}
// Ideally we would print an error here, but it causes infinite recursion due to
// `print_error_line()` trying to initialize us again (since we're technically not done the
// constructor yet). In this case it's safer to assume no colors, since we can't know what
// was actually desired.
m_colors = false;
return;
}
// If there's no color configuration, default to auto
m_colors = stdout_supports_color();
}
auto environment() -> Environment &
{
static Environment instance { std::make_unique<Environment_Data>() };
return instance;
}
}