Flesh out time module

components/display/display.c

@@ -7,7 +7,7 @@
 
 #include "display_driver.h"
 #include "fatal.h"
-#include "time.h"
+#include "time_manager.h"
 
 #include "esp_log.h"
 #include "esp_timer.h"
@@ -57,7 +57,7 @@ static void show_time(unsigned hour, unsigned minute)
 static void update_time(void *arg)
 {
 	(void)arg;
-	const Time time = time_get();
+	const Time time = get_time();
 	show_time(time.hour, time.minute);
 }
 

components/time/CMakeLists.txt

@@ -1,5 +1,5 @@
 idf_component_register(
-  SRCS "time.c"
+  SRCS "time_manager.c"
   INCLUDE_DIRS "."
-  REQUIRES
+  REQUIRES config
 )

components/time/time.c

@@ -1,15 +0,0 @@
-/*
- * SPDX-License-Identifier: AGPL-3.0-only
- * Copyright (c) Camden Dixie O'Brien
- */
-
-#include "time.h"
-
-void time_init(void)
-{
-}
-
-Time time_get(void)
-{
-	return (Time){ .hour = 13, .minute = 37 };
-}

components/time/time_manager.c

@@ -0,0 +1,33 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) Camden Dixie O'Brien
+ */
+
+#include "time_manager.h"
+
+#include "config.h"
+
+#include <time.h>
+
+static void handle_timezone_update(const char *timezone)
+{
+	setenv("TZ", timezone, 1);
+	tzset();
+}
+
+void time_manager_init(void)
+{
+	char timezone[CONFIG_MAX_VALUE_SIZE];
+	(void)config_get_timezone(timezone, CONFIG_MAX_VALUE_SIZE);
+	handle_timezone_update(timezone);
+
+	config_add_timezone_callback(&handle_timezone_update);
+}
+
+Time get_time(void)
+{
+	const time_t now = time(NULL);
+	struct tm timeinfo;
+	(void)localtime_r(&now, &timeinfo);
+	return (Time) { .hour = timeinfo.tm_hour, .minute = timeinfo.tm_min };
+}

components/time/time_manager.h

@@ -3,8 +3,8 @@
  * Copyright (c) Camden Dixie O'Brien
  */
 
-#ifndef TIME_H
+#ifndef TIME_MANAGER_H
-#define TIME_H
+#define TIME_MANAGER_H
 
 typedef struct {
 	unsigned hour;
@@ -14,11 +14,11 @@ typedef struct {
 /**
  * Initialize the time module.
  */
-void time_init(void);
+void time_manager_init(void);
 
 /**
  * Get the current time.
  */
-Time time_get(void);
+Time get_time(void);
 
 #endif