[FL-3024] Locale settings (#2137)

* Locale settings
* Time/date format fix
* Locale: add docs, enums for HAL, cleanup.

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

applications/services/locale/locale.c

@@ -0,0 +1,109 @@
+#include "locale.h"
+
+#define TAG "LocaleSrv"
+
+LocaleMeasurementUnits locale_get_measurement_unit(void) {
+    return (LocaleMeasurementUnits)furi_hal_rtc_get_locale_units();
+}
+
+void locale_set_measurement_unit(LocaleMeasurementUnits format) {
+    furi_hal_rtc_set_locale_units((FuriHalRtcLocaleUnits)format);
+}
+
+LocaleTimeFormat locale_get_time_format(void) {
+    return (LocaleTimeFormat)furi_hal_rtc_get_locale_timeformat();
+}
+
+void locale_set_time_format(LocaleTimeFormat format) {
+    furi_hal_rtc_set_locale_timeformat((FuriHalRtcLocaleTimeFormat)format);
+}
+
+LocaleDateFormat locale_get_date_format(void) {
+    return (LocaleDateFormat)furi_hal_rtc_get_locale_dateformat();
+}
+
+void locale_set_date_format(LocaleDateFormat format) {
+    furi_hal_rtc_set_locale_dateformat((FuriHalRtcLocaleDateFormat)format);
+}
+
+float locale_fahrenheit_to_celsius(float temp_f) {
+    return (temp_f - 32.f) / 1.8f;
+}
+
+float locale_celsius_to_fahrenheit(float temp_c) {
+    return (temp_c * 1.8f + 32.f);
+}
+
+void locale_format_time(
+    FuriString* out_str,
+    const FuriHalRtcDateTime* datetime,
+    const LocaleTimeFormat format,
+    const bool show_seconds) {
+    furi_assert(out_str);
+    furi_assert(datetime);
+
+    uint8_t hours = datetime->hour;
+    uint8_t am_pm = 0;
+    if(format == LocaleTimeFormat12h) {
+        if(hours > 12) {
+            hours -= 12;
+            am_pm = 2;
+        } else {
+            am_pm = 1;
+        }
+    }
+
+    if(show_seconds) {
+        furi_string_printf(out_str, "%02u:%02u:%02u", hours, datetime->minute, datetime->second);
+    } else {
+        furi_string_printf(out_str, "%02u:%02u", hours, datetime->minute);
+    }
+
+    if(am_pm > 0) {
+        furi_string_cat_printf(out_str, " %s", (am_pm == 1) ? ("AM") : ("PM"));
+    }
+}
+
+void locale_format_date(
+    FuriString* out_str,
+    const FuriHalRtcDateTime* datetime,
+    const LocaleDateFormat format,
+    const char* separator) {
+    furi_assert(out_str);
+    furi_assert(datetime);
+    furi_assert(separator);
+
+    if(format == LocaleDateFormatDMY) {
+        furi_string_printf(
+            out_str,
+            "%02u%s%02u%s%04u",
+            datetime->day,
+            separator,
+            datetime->month,
+            separator,
+            datetime->year);
+    } else if(format == LocaleDateFormatMDY) {
+        furi_string_printf(
+            out_str,
+            "%02u%s%02u%s%04u",
+            datetime->month,
+            separator,
+            datetime->day,
+            separator,
+            datetime->year);
+    } else {
+        furi_string_printf(
+            out_str,
+            "%04u%s%02u%s%02u",
+            datetime->year,
+            separator,
+            datetime->month,
+            separator,
+            datetime->day);
+    }
+}
+
+int32_t locale_on_system_start(void* p) {
+    UNUSED(p);
+    return 0;
+}