Current month calendar in clock tooltip.

src/modules/clock.cpp

@@ -1,4 +1,86 @@
 #include "modules/clock.hpp"
+#include <sstream>
+#include <utf8.h>
+
+using zoned_time = date::zoned_time<std::chrono::system_clock::duration>;
+
+struct waybar_time {
+  std::locale locale;
+  zoned_time ztime;
+};
+
+namespace {
+
+size_t utf8_strlen(const std::string& s) {
+  return utf8::distance(s.begin(), s.end());
+}
+
+std::string utf8_substr(const std::string s, size_t len) {
+  utf8::iterator it(s.begin(), s.begin(), s.end());
+  for (size_t i = 0; i < len; ++i) {
+    ++it;
+  }
+  int byte_count = it.base() - s.begin();
+  return s.substr(0, byte_count);
+}
+
+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 << ' ';
+    auto wd_string = date::format(locale, "%a", wd);
+    auto wd_string_len = utf8_strlen(wd_string);
+    if (wd_string_len > 2) {
+      wd_string = utf8_substr(wd_string, 2);
+      wd_string_len = 2;
+    }
+    const std::string pad(2 - wd_string_len, ' ');
+    os << pad << wd_string;
+  } while (++wd != first_dow);
+  os << "\n";
+}
+
+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 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);
+    }
+  }
+
+  return os.str();
+}
+
+}
 
 waybar::modules::Clock::Clock(const std::string& id, const Json::Value& config)
     : ALabel(config, "clock", id, "{:%H:%M}", 60)
@@ -24,13 +106,6 @@ waybar::modules::Clock::Clock(const std::string& id, const Json::Value& config)
   };
 }
 
-using zoned_time = date::zoned_time<std::chrono::system_clock::duration>;
-
-struct waybar_time {
-  std::locale locale;
-  zoned_time ztime;
-};
-
 auto waybar::modules::Clock::update() -> void {
   if (!fixed_time_zone_) {
     // Time zone can change. Be sure to pick that.
@@ -44,11 +119,12 @@ auto waybar::modules::Clock::update() -> void {
 
   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);
-      label_.set_tooltip_text(tooltip_text);
+      auto tooltip_text = fmt::format(tooltip_format, wtime, fmt::arg("calendar", calendar));
+      label_.set_tooltip_markup(tooltip_text);
     } else {
-      label_.set_tooltip_text(text);
+      label_.set_tooltip_markup(text);
     }
   }
 }