PLatformIO's external scripts How to use them, middleware functions are a bit problematic

[GPTKEY]

I want to replace the library files under the kernel package with files from the project Lib library. I need to use an external script

I have repeatedly passed xxx.c directly to an external script using env.AddBuildMiddleware(replace_node_with_another, lib_file) and only see AddBuildMiddleware executed once at compile time, is this a bug? The replace_node_with_another() function does not return None.

I've added extra_scripts to the ini file = pre:extra_script.py

I've been testing for a day and I've determined that there is a problem with this way of handling kernel and framework library headers.

[valeros]

Hi @GPTKEY, do you mind sharing your platformio.ini and the code from the extra script here?

[GPTKEY]

[env:bluepill_f103c8]
board = bluepill_f103c8
platform = ststm32
framework = arduino
extra_scripts = pre:extra_script.py
build_flags = -I./lib/uart/
lib_deps = 
    bxparks/AceButton@^1.9.2
    arduino-libraries/ArduinoRS485@^1.0.2
    arduino-libraries/ArduinoModbus@^1.0.7
debug_tool = jlink
upload_protocol = jlink
; platform_packages = framework-arduinoststm32

middleware_functions = [
    "**/uart.c",
    "**/uart.h"
]

for file_path in middleware_functions :
    env.AddBuildMiddleware(replace_node_with_another, file_path)

I tested it many times and finally implemented AddBuildMiddleware() to run successfully. But it didn't work the way I wanted it to when I compiled it later. Because when I replace the header file, it doesn't work. Maybe the header file is not supported, or there are some parameter variations that prevent the header file from being fully replaced.

[valeros]

Unfortunately, only source files can be used with AddBuildMiddleware helper. Not sure if it's applicable in your case, but there is a possible alternative for overriding default packages described here https://docs.platformio.org/en/latest/scripting/examples/override_package_files.html