Lakka: add menu for time zone setting

This adds new entry under Settings -> Services (where all Lakka related
services are currently available, such as switches for services like
SSH, Samba, etc.). By adding this the users do not have to use the
command line / access the file system directly to change their local
time zone to adjust the date/time displayed in RetroArch.

configuration.c

@@ -1185,6 +1185,47 @@ const char *config_get_midi_driver_options(void)
    return char_list_new_special(STRING_LIST_MIDI_DRIVERS, NULL);
 }
 
+#ifdef HAVE_LAKKA
+void config_set_timezone(char *timezone)
+{
+   setenv("TZ", timezone, 1);
+   tzset();
+}
+
+const char *config_get_all_timezones(void)
+{
+   return char_list_new_special(STRING_LIST_TIMEZONES, NULL);
+}
+
+static void load_timezone(char *setting)
+{
+   char haystack[TIMEZONE_LENGTH+32];
+   static char *needle = "TIMEZONE=";
+   size_t needle_len = strlen(needle);
+
+   RFILE *tzfp = filestream_open(LAKKA_TIMEZONE_PATH,
+                       RETRO_VFS_FILE_ACCESS_READ,
+                       RETRO_VFS_FILE_ACCESS_HINT_NONE);
+
+   if (tzfp != NULL)
+   {
+      filestream_gets(tzfp, haystack, sizeof(haystack)-1);
+      filestream_close(tzfp);
+
+      char *start = strstr(haystack, needle);
+
+      if (start != NULL)
+         snprintf(setting, TIMEZONE_LENGTH, "%s", start + needle_len);
+      else
+         snprintf(setting, TIMEZONE_LENGTH, "%s", DEFAULT_TIMEZONE);
+   }
+   else
+      snprintf(setting, TIMEZONE_LENGTH, "%s", DEFAULT_TIMEZONE);
+
+   config_set_timezone(setting);
+}
+#endif
+
 bool config_overlay_enable_default(void)
 {
    if (g_defaults.overlay_set)
@@ -2347,6 +2388,7 @@ void config_set_defaults(void *data)
    configuration_set_bool(settings,
          settings->bools.bluetooth_enable, filestream_exists(LAKKA_BLUETOOTH_PATH));
    configuration_set_bool(settings, settings->bools.localap_enable, false);
+   load_timezone(settings->arrays.timezone);
 #endif
 
 #ifdef HAVE_MENU

configuration.h

@@ -29,6 +29,10 @@
 #include "input/input_defines.h"
 #include "led/led_defines.h"
 
+#ifdef HAVE_LAKKA
+#include "lakka.h"
+#endif
+
 #define configuration_set_float(settings, var, newvar) \
 { \
    settings->modified = true; \
@@ -381,6 +385,9 @@ typedef struct settings
       char ai_service_url[PATH_MAX_LENGTH];
 
       char crt_switch_timings[255];
+#ifdef HAVE_LAKKA
+      char timezone[TIMEZONE_LENGTH];
+#endif
    } arrays;
 
    struct
@@ -1011,6 +1018,11 @@ void config_save_file_salamander(void);
 
 settings_t *config_get_ptr(void);
 
+#ifdef HAVE_LAKKA
+const char *config_get_all_timezones(void);
+void config_set_timezone(char *timezone);
+#endif
+
 RETRO_END_DECLS
 
 #endif

intl/msg_hash_lbl.h

@@ -195,6 +195,10 @@ MSG_HASH(
    MENU_ENUM_LABEL_BLUETOOTH_ENABLE,
    "bluetooth_enable"
    )
+MSG_HASH(
+   MENU_ENUM_LABEL_TIMEZONE,
+   "timezone"
+   )
 #endif
 MSG_HASH(
    MENU_ENUM_LABEL_BUILDBOT_ASSETS_URL,

intl/msg_hash_us.c

@@ -2289,6 +2289,15 @@ int msg_hash_get_help_us_enum(enum msg_hash_enums msg, char *s, size_t len)
             snprintf(s, len,
                      "MIDI driver to use.");
             break;
+#ifdef HAVE_LAKKA
+        case MENU_ENUM_LABEL_TIMEZONE:
+            snprintf(s, len,
+                     "Displays a list of available timezones. After\n"
+                     "selecting a time zone, time and date is adjusted\n"
+                     "to the selected time zone. It assumes, that system/\n"
+                     "hardware clock is set to UTC.");
+            break;
+#endif
         case MENU_ENUM_LABEL_MIDI_INPUT:
             snprintf(s, len,
                      "Sets the input device (driver specific).\n"

intl/msg_hash_us.h

@@ -12218,6 +12218,14 @@ MSG_HASH(
    MENU_ENUM_SUBLABEL_LOCALAP_ENABLE,
    "Enable or disable Wi-Fi Access Point."
    )
+MSG_HASH(
+   MENU_ENUM_LABEL_VALUE_TIMEZONE,
+   "Time zone"
+   )
+MSG_HASH(
+   MENU_ENUM_SUBLABEL_TIMEZONE,
+   "Select your time zone to adjust the date and time to your location."
+   )
 MSG_HASH(
    MSG_LOCALAP_SWITCHING_OFF,
    "Switching off Wi-Fi Access Point."

lakka.h

@@ -24,6 +24,10 @@
 #define LAKKA_UPDATE_DIR     "/storage/.update/"
 #define LAKKA_CONNMAN_DIR    "/storage/.cache/connman/"
 #define LAKKA_LOCALAP_PATH   "/storage/.cache/services/localap.conf"
+#define LAKKA_TIMEZONE_PATH  "/storage/.cache/timezone"
+
+#define DEFAULT_TIMEZONE "UTC"
+#define TIMEZONE_LENGTH 255
 
 #include "switch_performance_profiles.h"
 

list_special.h

@@ -56,6 +56,9 @@ enum string_list_type
    STRING_LIST_RECORD_DRIVERS,
    STRING_LIST_MIDI_DRIVERS,
    STRING_LIST_SUPPORTED_CORES_PATHS,
+#ifdef HAVE_LAKKA
+   STRING_LIST_TIMEZONES,
+#endif
    STRING_LIST_SUPPORTED_CORES_NAMES
 };
 

menu/cbs/menu_cbs_get_value.c

@@ -1572,6 +1572,9 @@ static int menu_cbs_init_bind_get_string_representation_compare_label(
          case MENU_ENUM_LABEL_BLUETOOTH_DRIVER:
          case MENU_ENUM_LABEL_WIFI_DRIVER:
          case MENU_ENUM_LABEL_MENU_DRIVER:
+#ifdef HAVE_LAKKA
+         case MENU_ENUM_LABEL_TIMEZONE:
+#endif
             BIND_ACTION_GET_VALUE(cbs, menu_action_setting_disp_set_label);
             break;
          case MENU_ENUM_LABEL_CONNECT_BLUETOOTH:

menu/cbs/menu_cbs_sublabel.c

@@ -227,6 +227,7 @@ DEFAULT_SUBLABEL_MACRO(action_bind_sublabel_ssh_enable,                    MENU_
 DEFAULT_SUBLABEL_MACRO(action_bind_sublabel_samba_enable,                  MENU_ENUM_SUBLABEL_SAMBA_ENABLE )
 DEFAULT_SUBLABEL_MACRO(action_bind_sublabel_bluetooth_enable,              MENU_ENUM_SUBLABEL_BLUETOOTH_ENABLE )
 DEFAULT_SUBLABEL_MACRO(action_bind_sublabel_localap_enable,                MENU_ENUM_SUBLABEL_LOCALAP_ENABLE )
+DEFAULT_SUBLABEL_MACRO(action_bind_sublabel_timezone,                      MENU_ENUM_SUBLABEL_TIMEZONE)
 #endif
 DEFAULT_SUBLABEL_MACRO(action_bind_sublabel_user_language,                 MENU_ENUM_SUBLABEL_USER_LANGUAGE)
 DEFAULT_SUBLABEL_MACRO(action_bind_sublabel_max_swapchain_images,          MENU_ENUM_SUBLABEL_VIDEO_MAX_SWAPCHAIN_IMAGES )
@@ -3907,6 +3908,9 @@ int menu_cbs_init_bind_sublabel(menu_file_list_cbs_t *cbs,
          case MENU_ENUM_LABEL_LOCALAP_ENABLE:
             BIND_ACTION_SUBLABEL(cbs, action_bind_sublabel_localap_enable);
             break;
+         case MENU_ENUM_LABEL_TIMEZONE:
+            BIND_ACTION_SUBLABEL(cbs, action_bind_sublabel_timezone);
+            break;
 #endif
          case MENU_ENUM_LABEL_USER_LANGUAGE:
             BIND_ACTION_SUBLABEL(cbs, action_bind_sublabel_user_language);

menu/menu_displaylist.c

@@ -7704,6 +7704,7 @@ unsigned menu_displaylist_build_list(
                {MENU_ENUM_LABEL_SAMBA_ENABLE,                                          PARSE_ONLY_BOOL},
                {MENU_ENUM_LABEL_BLUETOOTH_ENABLE,                                      PARSE_ONLY_BOOL},
                {MENU_ENUM_LABEL_LOCALAP_ENABLE,                                        PARSE_ONLY_BOOL},
+               {MENU_ENUM_LABEL_TIMEZONE,                                              PARSE_ONLY_STRING_OPTIONS},
             };
 
             for (i = 0; i < ARRAY_SIZE(build_list); i++)

menu/menu_setting.c

@@ -7991,6 +7991,24 @@ static void localap_enable_toggle_change_handler(rarch_setting_t *setting)
    driver_wifi_tether_start_stop(*setting->value.target.boolean,
          LAKKA_LOCALAP_PATH);
 }
+
+static void timezone_change_handler(rarch_setting_t *setting)
+{
+   if (!setting)
+      return;
+
+   config_set_timezone(setting->value.target.string);
+
+   RFILE *tzfp = filestream_open(LAKKA_TIMEZONE_PATH,
+                       RETRO_VFS_FILE_ACCESS_WRITE,
+                       RETRO_VFS_FILE_ACCESS_HINT_NONE);
+
+   if (tzfp != NULL)
+   {
+      filestream_printf(tzfp, "TIMEZONE=%s", setting->value.target.string);
+      filestream_close(tzfp);
+   }
+}
 #endif
 
 static bool setting_append_list_input_player_options(
@@ -18539,6 +18557,23 @@ static bool setting_append_list(
                   SD_FLAG_NONE);
             (*list)[list_info->index - 1].change_handler = localap_enable_toggle_change_handler;
 
+            CONFIG_STRING_OPTIONS(
+                  list, list_info,
+                  settings->arrays.timezone,
+                  sizeof(settings->arrays.timezone),
+                  MENU_ENUM_LABEL_TIMEZONE,
+                  MENU_ENUM_LABEL_VALUE_TIMEZONE,
+                  DEFAULT_TIMEZONE,
+                  config_get_all_timezones(),
+                  &group_info,
+                  &subgroup_info,
+                  parent_group,
+                  general_read_handler,
+                  general_write_handler);
+            SETTINGS_DATA_LIST_CURRENT_ADD_FLAGS(list, list_info, SD_FLAG_IS_DRIVER);
+            (*list)[list_info->index - 1].action_ok      = setting_action_ok_mapped_string;
+            (*list)[list_info->index - 1].change_handler = timezone_change_handler;
+
             END_SUB_GROUP(list, list_info, parent_group);
             END_GROUP(list, list_info, parent_group);
 #endif

msg_hash.h

@@ -1826,6 +1826,7 @@ enum msg_hash_enums
    MENU_LABEL(SAMBA_ENABLE),
    MENU_LABEL(BLUETOOTH_ENABLE),
    MENU_LABEL(LOCALAP_ENABLE),
+   MENU_LABEL(TIMEZONE),
 #endif
    MENU_LABEL(NETPLAY_DELAY_FRAMES),
    MENU_LABEL(NETPLAY_PUBLIC_ANNOUNCE),

retroarch.c

@@ -277,6 +277,10 @@
 /* Forward declarations */
 #include "retroarch_fwd_decls.h"
 
+#ifdef HAVE_LAKKA
+#include "lakka.h"
+#endif
+
 /* GLOBAL POINTER GETTERS */
 
 #ifdef HAVE_NETWORKING
@@ -8722,6 +8726,40 @@ struct string_list *string_list_new_special(enum string_list_type type,
             string_list_append(s, opt, attr);
          }
          break;
+#ifdef HAVE_LAKKA
+      case STRING_LIST_TIMEZONES:
+         {
+            const char *opt  = DEFAULT_TIMEZONE;
+            *len            += strlen(opt) + 1;
+            string_list_append(s, opt, attr);
+
+            FILE *zones_file = popen("grep -v ^# /usr/share/zoneinfo/zone.tab | "
+                                     "cut -f3 | "
+                                     "sort", "r");
+
+            if (zones_file != NULL)
+            {
+               char zone_desc[TIMEZONE_LENGTH];
+               while (fgets(zone_desc, TIMEZONE_LENGTH, zones_file))
+               {
+                  size_t zone_desc_len = strlen(zone_desc);
+
+                  if (zone_desc_len > 0)
+                     if (zone_desc[--zone_desc_len] == '\n')
+                        zone_desc[zone_desc_len] = '\0';
+
+                  if (strlen(zone_desc) > 0)
+                  {
+                     const char *opt  = zone_desc;
+                     *len            += strlen(opt) + 1;
+                     string_list_append(s, opt, attr);
+                  }
+               }
+               pclose(zones_file);
+            }
+         }
+         break;
+#endif
       case STRING_LIST_SUPPORTED_CORES_PATHS:
          core_info_get_list(&core_info_list);