Add ci pipeline to PR: Compile under esp-idf new build sytem

.github/workflows/ci.yml

@@ -208,6 +208,17 @@ jobs:
       - name: Build
         run: extras/ci/platformio.sh ${{ matrix.board }}
 
+  espidf:
+    name: ESP-IDF
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: install ESP-IDF
+        run: source extras/ci/espidf/install.sh
+      - name: build examples
+        run: source extras/ci/espidf.sh
+
   particle:
     name: Particle
     needs: gcc

extras/ci/espidf.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+###############
+# BUILD
+###############
+
+(
+cd extras/ci/espidf || exit
+
+# set env variables
+. ./esp-idf/export.sh
+
+(
+  # build all examples
+  for EXAMPLE in ./components/ArduinoJson/examples/*/*.ino; do
+    cp $EXAMPLE main/main.cpp
+    idf.py build || exit
+  done   
+)
+)
+

extras/ci/espidf/CMakeLists.txt

@@ -0,0 +1,6 @@
+# The following lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(hello-world)

extras/ci/espidf/README.md

@@ -0,0 +1,2 @@
+# ESP-IDF Continuous Integration Pipeline - Project Template
+

extras/ci/espidf/install.sh

@@ -0,0 +1,75 @@
+#!/bin/sh
+
+###############
+# INSTALLATION
+###############
+
+# change into root template directory
+cd extras/ci/espidf || exit
+
+echo "installing esp-idf..."
+if [ ! -d "esp-idf" ] ; then
+  git clone https://github.com/espressif/esp-idf.git
+fi
+(
+  cd esp-idf || exit
+  git checkout 1d7068e4b
+  git submodule update --init --recursive
+  ./install.sh
+)
+
+echo "esp-idf installed"
+
+if [ ! -d "components" ] ; then
+    mkdir -p components
+fi
+
+echo "installing arduino-esp32"
+(
+  cd components || exit
+  if [ ! -d "arduino" ] ; then
+    git clone https://github.com/espressif/arduino-esp32.git arduino
+  fi
+  (
+    cd arduino || exit
+    git checkout master #21947eb
+    git submodule update --init --recursive
+  )
+)
+echo "arduino-esp32 installed"
+
+echo "installing ArduinoJson"
+(
+  cd components || exit
+  if [ ! -d "ArduinoJson" ] ; then
+    git clone https://github.com/qt1/ArduinoJson.git 
+    # TODO: must be switched (after PR merge) to: https://github.com/bblanchon/ArduinoJson.git
+  fi
+  (
+    cd ArduinoJson || exit
+    git checkout master
+    git submodule update --init --recursive
+  )
+)
+echo "ArduinoJson installed"
+
+echo "installing Ethernet"
+(
+  cd components || exit
+  if [ ! -d "Ethernet" ] ; then
+    git clone https://github.com/andreaskuster/Ethernet.git
+    # TODO: must be switched to (after PR merge): https://github.com/arduino-libraries/Ethernet.git
+  fi
+  (
+    cd Ethernet || exit
+    git checkout master
+    git submodule update --init --recursive
+  )
+)
+echo "Ethernet installed"
+
+# set env variables
+. ./esp-idf/export.sh
+
+cd ../../..
+

extras/ci/espidf/main/CMakeLists.txt

@@ -0,0 +1,5 @@
+idf_component_register(SRCS "main.cpp"
+                       INCLUDE_DIRS "")
+
+# required to break possible dependency cycle                       
+set_property(TARGET ${COMPONENT_LIB} APPEND PROPERTY LINK_INTERFACE_MULTIPLICITY 3)

extras/ci/espidf/main/component.mk

@@ -0,0 +1,4 @@
+#
+# "main" pseudo-component makefile.
+#
+# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)