Waybar/src/modules/clock.cpp

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#include "modules/clock.hpp"
#include <mutex>
#include <sstream>
using zoned_time = date::zoned_time<std::chrono::system_clock::duration>;
struct waybar_time {
std::locale locale;
zoned_time ztime;
};
namespace {
void weekdays_header(const std::locale& locale, const date::weekday& first_dow, std::ostream& os) {
auto wd = first_dow;
do {
if (wd != first_dow) os << ' ';
Glib::ustring wd_ustring(date::format(locale, "%a", wd));
auto wd_len = wd_ustring.length();
if (wd_len > 2) {
wd_ustring = wd_ustring.substr(0, 2);
wd_len = 2;
}
const std::string pad(2 - wd_len, ' ');
os << pad << wd_ustring;
} while (++wd != first_dow);
os << "\n";
}
struct CachedCalendar {
date::year_month_day ymd;
std::string text;
void set(const date::year_month_day& ymd_, std::string text_) {
ymd = ymd_;
text = text_;
}
};
std::mutex cached_calendar_mutex; // protects cached_calendar.
CachedCalendar cached_calendar;
std::string calendar_text(const waybar_time& wtime, const date::weekday& first_dow) {
const auto daypoint = date::floor<date::days>(wtime.ztime.get_local_time());
const auto ymd = date::year_month_day(daypoint);
const std::lock_guard<std::mutex> lock(cached_calendar_mutex);
if (cached_calendar.ymd == ymd) {
return cached_calendar.text;
}
const date::year_month ym(ymd.year(), ymd.month());
const auto curr_day = ymd.day();
std::stringstream os;
weekdays_header(wtime.locale, first_dow, os);
// First week prefixed with spaces if needed.
auto wd = date::weekday(ym/1);
auto empty_days = (wd - first_dow).count();
if (empty_days > 0) {
os << std::string(empty_days * 3 - 1, ' ');
}
auto d = date::day(1);
do {
if (wd != first_dow) os << ' ';
if (d == curr_day) {
os << "<b><u>" << date::format("%e", d) << "</u></b>";
} else {
os << date::format("%e", d);
}
++d;
} while (++wd != first_dow);
// Following weeks.
auto last_day = (ym/date::literals::last).day();
for ( ; d <= last_day; ++d, ++wd) {
os << ((wd == first_dow) ? '\n' : ' ');
if (d == curr_day) {
os << "<b><u>" << date::format("%e", d) << "</u></b>";
} else {
os << date::format("%e", d);
}
}
auto result = os.str();
cached_calendar.set(ymd, result);
return result;
}
}
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waybar::modules::Clock::Clock(const std::string& id, const Json::Value& config)
: ALabel(config, "clock", id, "{:%H:%M}", 60)
, fixed_time_zone_(false)
{
if (config_["timezone"].isString()) {
time_zone_ = date::locate_zone(config_["timezone"].asString());
fixed_time_zone_ = true;
}
if (config_["locale"].isString()) {
locale_ = std::locale(config_["locale"].asString());
} else {
locale_ = std::locale("");
}
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thread_ = [this] {
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dp.emit();
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auto now = std::chrono::system_clock::now();
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auto timeout = std::chrono::floor<std::chrono::seconds>(now + interval_);
auto diff = std::chrono::seconds(timeout.time_since_epoch().count() % interval_.count());
thread_.sleep_until(timeout - diff);
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};
}
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auto waybar::modules::Clock::update() -> void {
if (!fixed_time_zone_) {
// Time zone can change. Be sure to pick that.
time_zone_ = date::current_zone();
}
auto now = std::chrono::system_clock::now();
waybar_time wtime = {locale_, date::make_zoned(time_zone_, now)};
auto text = fmt::format(format_, wtime);
label_.set_markup(text);
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if (tooltipEnabled()) {
if (config_["tooltip-format"].isString()) {
const auto calendar = calendar_text(wtime, date::Sunday);
auto tooltip_format = config_["tooltip-format"].asString();
auto tooltip_text = fmt::format(tooltip_format, wtime, fmt::arg("calendar", calendar));
label_.set_tooltip_markup(tooltip_text);
} else {
label_.set_tooltip_markup(text);
}
}
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}
template <>
struct fmt::formatter<waybar_time> : fmt::formatter<std::tm> {
template <typename FormatContext>
auto format(const waybar_time& t, FormatContext& ctx) {
return format_to(ctx.out(), "{}", date::format(t.locale, fmt::to_string(tm_format), t.ztime));
}
};