environment.cpp
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#include "crucible/core/environment.hpp"
#include "crucible/core/console.hpp"
#include "crucible/core/iterator.hpp"
#include "crucible/core/memory.hpp"
#include "crucible/core/string.hpp"
#if CRUCIBLE_PLATFORM_IS_POSIX_LIKE
#include <unistd.h>
#endif // CRUCIBLE_PLATFORM_IS_POSIX_LIKE
#include <cstdio>
#include <cstdlib>
#include <mutex>
namespace crucible
{
namespace
{
[[nodiscard]] auto stdout_supports_color() -> bool
{
#if CRUCIBLE_PLATFORM_IS_POSIX_LIKE
return ::isatty(::fileno(stdout));
#else
return false; // Play it safe.
#endif // CRUCIBLE_PLATFORM_IS_POSIX_LIKE
}
}
struct environment_data
{
std::mutex mtx;
};
environment_handle::environment_handle(std::unique_ptr<environment_data> data) :
m_data { std::move(data) }
{}
auto environment_handle::initialize() -> void
{
auto locker = lock();
initialize_colors();
}
auto environment_handle::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 && crucible_colors_data[0] != '\0') {
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;
}
console()
.format_err_line("Unrecognized CRUCIBLE_COLORS value `{}`", crucible_colors)
.format_err_line("")
.format_err_line("To disable colors, do ONE of the following:")
.format_err_line(" * Set the NO_COLOR environment variable to any nonempty value")
.format_err_line(" * Set the CRUCIBLE_COLORS environment variable to 0, no, off, false, or never")
.format_err_line("")
.format_err_line("To enable colors, do ONE of the following:")
.format_err_line(" * Set the CLICOLOR_FORCE environment variable to any nonempty value")
.format_err_line(" * Set the CRUCIBLE_COLORS environment variable to 1, yes, on, true, or always")
.format_err_line("")
.format_err_line("To autodetect whether or not to use colors:")
.format_err_line(" * Set the CRUCIBLE_COLORS environment variable to auto, automatic, or detect")
.format_err_line("")
.format_err_line("Colors are DISABLED due to this error")
.format_err_line("");
m_colors = false;
return;
}
// If there's no color configuration, default to auto
m_colors = stdout_supports_color();
}
auto environment_handle::lock() -> std::unique_lock<std::mutex>
{
return std::unique_lock<std::mutex> { m_data->mtx };
}
auto environment() -> environment_handle &
{
static environment_handle instance { std::make_unique<environment_data>() };
return instance;
}
}