CMake: use idf_component_register

Documentation for ESP-IDF versions 4.4, 4.5, 5.0 and 5.1 do not contain
any references to register_component(). This seems to be the way how
things where done in ESP-IDF version 3.x.

For some reason this picks up a bunch of components we don't use.
Exclude those. The net result is more lines of CMake code, but if at
some point Espressif drops support for register_component() we are
prepared.

Total sizes before:

Used stat D/IRAM:  180122 bytes ( 165734 remain, 52.1% used)
      .data size:   30524 bytes
      .bss  size:   25760 bytes
      .text size:  122811 bytes
   .vectors size:    1027 bytes
Used Flash size : 2061331 bytes
           .text: 1497211 bytes
         .rodata:  563864 bytes
Total image size: 2215693 bytes (.bin may be padded larger)

Total sizes after:

Total sizes:
Used stat D/IRAM:  180122 bytes ( 165734 remain, 52.1% used)
      .data size:   30524 bytes
      .bss  size:   25760 bytes
      .text size:  122811 bytes
   .vectors size:    1027 bytes
Used Flash size : 2061335 bytes
           .text: 1497215 bytes
         .rodata:  563864 bytes
Total image size: 2215697 bytes (.bin may be padded larger)

CMakeLists.txt

@@ -2,8 +2,6 @@
 # CMakeLists in this exact order for cmake to work correctly
 cmake_minimum_required(VERSION 3.5)
 
-set(COMPONENTS main)
-
 if($ENV{CI})
     message("CI detected, disabling MultiNet support")
 else()
@@ -16,6 +14,39 @@ else()
     add_definitions(-DWILLOW_USER_AGENT="Willow/0.1")
 endif()
 
+set(EXCLUDE_COMPONENTS
+    "adf_utils"
+    "app_trace"
+    "battery_service"
+    "bluetooth_service"
+    "cmock"
+    "coredump_upload_service"
+    "esp_codec_dev"
+    "esp_eth"
+    "esp_event_cast"
+    "esp_gdbstub"
+    "esp_hid"
+    "esp_http_server"
+    "esp_https_ota"
+    "esp_https_server"
+    "esp_local_ctrl"
+    "espcoredump"
+    "idf_test"
+    "ieee802154"
+    "mqtt"
+    "openthread"
+    "ota_service"
+    "perfmon"
+    "playlist"
+    "protobuf-c"
+    "protocomm"
+    "touch_element"
+    "ulp"
+    "unity"
+    "usb"
+    "wifi_provisioning"
+)
+
 include($ENV{ADF_PATH}/CMakeLists.txt)
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 

main/CMakeLists.txt

@@ -1,45 +1,29 @@
-set(COMPONENT_SRCS
-    "audio.c"
-    "config.c"
-    "display.c"
-    "endpoint/hass.c"
-    "endpoint/openhab.c"
-    "endpoint/rest.c"
-    "http.c"
-    "input.c"
-    "log.c"
-    "lv_img_hand_left.c"
-    "network.c"
-    "ota.c"
-    "slvgl.c"
-    "system.c"
-    "tasks.c"
-    "timer.c"
-    "ui.c"
-    "was.c"
-    "main.c"
-)
-set(COMPONENT_ADD_INCLUDEDIRS .)
-set(COMPONENT_PRIV_REQUIRES
-    app_update
-    audio_board
-    audio_hal
-    audio_pipeline
-    audio_recorder
-    audio_sal
-    audio_stream
-    esp_http_client
-    esp_peripherals
-    esp_websocket_client
-    input_key_service
-    spiffs
-)
-
 if(CONFIG_WILLOW_ETHERNET)
-    set(COMPONENT_SRCS ${COMPONENT_SRCS} "net/ethernet.c")
+    set(WILLOW_ETHERNET_SRC_DIRS "net")
 endif()
 
-register_component()
+idf_component_register(
+    SRC_DIRS
+        "."
+        "endpoint"
+        "${WILLOW_ETHERNET_SRC_DIRS}"
+    INCLUDE_DIRS
+        "."
+        "${WILLOW_ETHERNET_SRC_DIRS}"
+    PRIV_REQUIRES
+        app_update
+        audio_board
+        audio_hal
+        audio_pipeline
+        audio_recorder
+        audio_sal
+        audio_stream
+        esp_http_client
+        esp_peripherals
+        esp_websocket_client
+        input_key_service
+        spiffs
+)
 
 spiffs_create_partition_image(user ../spiffs/user FLASH_IN_PROJECT)