Add a console with a reboot command

Couldn't just call the component "console" as that conflicted with the
ESP-IDF component, so opted for "console-wrapper".

components/console_wrapper/CMakeLists.txt

@@ -0,0 +1,5 @@
+idf_component_register(
+  SRCS "console.c"
+  INCLUDE_DIRS "."
+  REQUIRES console esp_system
+)

components/console_wrapper/console.c

@@ -0,0 +1,63 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) Camden Dixie O'Brien
+ */
+
+#include "console.h"
+
+#include "esp_console.h"
+#include "esp_log.h"
+#include "esp_system.h"
+
+#define TAG "Console"
+
+static esp_console_repl_t *repl;
+
+static int reboot_command_func(int argc, char **argv)
+{
+	(void)argc;
+	(void)argv;
+	(void)esp_restart();
+	return 0;
+}
+
+void console_init(void)
+{
+	esp_err_t error;
+
+	error = esp_console_register_help_command();
+	if (error != ESP_OK)
+		ESP_LOGE(TAG, "Error registering help command: %04x", error);
+
+	esp_console_repl_config_t repl_config
+	    = ESP_CONSOLE_REPL_CONFIG_DEFAULT();
+	repl_config.prompt = ">";
+	esp_console_dev_uart_config_t uart_config
+	    = ESP_CONSOLE_DEV_UART_CONFIG_DEFAULT();
+	error = esp_console_new_repl_uart(&uart_config, &repl_config, &repl);
+	if (error != ESP_OK) {
+		ESP_LOGE(TAG, "Error initializing console REPL: %04x", error);
+		return;
+	}
+
+	error = esp_console_start_repl(repl);
+	if (error != ESP_OK)
+		ESP_LOGE(TAG, "Error starting console REPL: %04x", error);
+
+	console_register(
+		"reboot", "Reboot the system", "reboot", reboot_command_func);
+}
+
+void console_register(
+    const char *name, const char *help, const char *hint, CommandFunc func)
+{
+	const esp_console_cmd_t command = {
+		.command = name,
+		.help = help,
+		.hint = hint,
+		.func = func,
+	};
+	const esp_err_t error = esp_console_cmd_register(&command);
+	if (error != ESP_OK)
+		ESP_LOGE(TAG, "Error registering command %s: %04x", name, error);
+}

components/console_wrapper/console.h

@@ -0,0 +1,25 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) Camden Dixie O'Brien
+ */
+
+#ifndef CONSOLE_H
+#define CONSOLE_H
+
+typedef int (*CommandFunc)(int argc, char **argv);
+
+/**
+ * Initialize and start the console.
+ */
+void console_init(void);
+
+/**
+ * Register a console command.
+ *
+ * The name, help and hint should all be null-terminated strings. Hint
+ * should list possible arguments.
+ */
+void console_register(
+	const char *name, const char *help, const char *hint, CommandFunc func);
+
+#endif

main/CMakeLists.txt

@@ -1,5 +1,5 @@
 idf_component_register(
   SRCS "main.c"
   INCLUDE_DIRS "."
-  REQUIRES display settings
+  REQUIRES console_wrapper display settings
 )

main/main.c

@@ -3,11 +3,13 @@
  * Copyright (c) Camden Dixie O'Brien
  */
 
+#include "console.h"
 #include "display.h"
 #include "settings.h"
 
 void app_main(void)
 {
+	console_init();
 	settings_init();
 	display_init();
 }