"Fix" local PIO build for all examples

What a pity PlatformIO doesn't seem to offer better support for Arduino libs.

Author: marcelstoer

adjust_src_dir.py

@@ -0,0 +1,5 @@
+import os
+
+Import("env")
+env['PROJECT_SRC_DIR'] = env['PROJECT_DIR'] + os.sep + "examples" + os.sep + env["PIOENV"]
+print("Setting the project directory to: {}".format(env['PROJECT_SRC_DIR']))

platformio.ini

@@ -8,15 +8,41 @@
 ; Please visit documentation for the other options and examples
 ; http://docs.platformio.org/page/projectconf.html
 
-[env:d1_mini]
+
+; *********************************************************************************************************************
+; 2021-06-13
+;
+; It is a pity PlatformIO does not support building such Arduino libraries locally out of the box. The current solution
+; evolved out of a discussion at https://community.platformio.org/t/build-an-arduino-library-for-esp8266-locally/10656
+; Occasionally the build fails because PIO somehow gets the dependency tree completely wrong. Running the build again
+; usually fixes it. 
+;
+; The default configuration will build *all* examples but you can easily uncomment the envs you do not need if you are 
+; working on just a single example.
+; *********************************************************************************************************************
+
+[platformio]
+lib_dir = $PROJECT_DIR
+
+[env]
+extra_scripts = pre:adjust_src_dir.py
 platform = espressif8266
 board = d1_mini
 framework = arduino
 upload_speed = 921600
-board_f_cpu = 160000000L
-lib_deps =  JsonStreamingParser,
-            ESP8266_SSD1306
-            simpleDSTadjust
-            DHT sensor library
-            Adafruit Unified Sensor
-            WifiManager@>=0.15.0-beta
+board_build.f_cpu = 160000000L
+lib_deps =  JsonStreamingParser
+            thingpulse/ESP8266 and ESP32 OLED driver for SSD1306 displays@^4.2.0
+
+; comment the ones you do not need
+[env:AerisForecastsDemo]
+[env:AerisObservationDemo]
+[env:AerisSunMoonDemo]
+[env:AstronomyDemo]
+[env:OpenWeatherMapCurrentDemo]
+[env:OpenWeatherMapForecastDemo]
+[env:OpenWeatherMapOneCallDemo]
+[env:PlaneSpotterDemo]
+[env:SunMoonCalcDemo]
+[env:WeatherStationDemo]
+[env:WorldClockDemo]