Add support for regular Arduino libs in "IDF-component" mode

Author: me-no-dev

project_include.cmake

@@ -0,0 +1,66 @@
+function(add_arduino_libraries libs_dir)
+    # Construct the absolute path for libs_dir relative to the CMake project root
+    set(libs_dir_abs "${CMAKE_SOURCE_DIR}/${libs_dir}")
+    
+    # Verify if libs_dir_abs is a valid directory
+    if(NOT IS_DIRECTORY "${libs_dir_abs}")
+        message(FATAL_ERROR "The specified libs_dir (${libs_dir_abs}) is not a valid directory.")
+        return()  # Stop processing if the directory is invalid
+    endif()
+
+    idf_component_get_property(arduino_esp32_lib arduino COMPONENT_LIB)
+    
+    # Loop through each folder in the libs_dir
+    file(GLOB children RELATIVE ${libs_dir_abs} ${libs_dir_abs}/*)
+    foreach(child ${children})
+        if(IS_DIRECTORY "${libs_dir_abs}/${child}")
+            # Check for library.properties and src directory
+            if(EXISTS "${libs_dir_abs}/${child}/library.properties" AND IS_DIRECTORY "${libs_dir_abs}/${child}/src")
+                message(STATUS "Processing ${child} in ${libs_dir_abs}")
+                # Read the library.properties file to check for ldflags and precompiled
+                file(STRINGS "${libs_dir_abs}/${child}/library.properties" properties)
+                set(found_precompiled FALSE)
+                foreach(property ${properties})
+                    # Process LD_FLAGS
+                    string(FIND "${property}" "ldflags=" ldflags_pos)
+                    if(NOT ${ldflags_pos} EQUAL -1)
+                        string(REPLACE "ldflags=" "" ldflags_value ${property})
+                        set_property(DIRECTORY APPEND PROPERTY LINK_FLAGS "${ldflags_value}")
+                        message(STATUS "Added linker flags from ${child}: ${ldflags_value}")
+                    endif()
+                    
+                    # Process precompiled libraries
+                    string(FIND "${property}" "precompiled=" precompiled_pos)
+                    if(NOT ${precompiled_pos} EQUAL -1)
+                        string(REPLACE "precompiled=" "" precompiled_value ${property})
+                        set(found_precompiled TRUE)
+                        if(precompiled_value STREQUAL "true" OR precompiled_value STREQUAL "full")
+                            file(GLOB lib_files "${libs_dir_abs}/${child}/src/${IDF_TARGET}/lib*.a")
+                            foreach(lib_file ${lib_files})
+                                target_link_libraries(${arduino_esp32_lib} INTERFACE ${lib_file})
+                                message(STATUS "Linked precompiled library for ${child}: ${lib_file}")
+                            endforeach()
+                        endif()
+                        if(precompiled_value STREQUAL "true")
+                            aux_source_directory("${libs_dir_abs}/${child}/src" src_files)
+                            target_sources(${arduino_esp32_lib} INTERFACE ${src_files})
+                            message(STATUS "Added source files for ${child}")
+                        endif()
+                    endif()
+                endforeach()
+                
+                # If no precompiled property found, add all sources
+                if(NOT found_precompiled)
+                    aux_source_directory("${libs_dir_abs}/${child}/src" src_files)
+                    target_sources(${arduino_esp32_lib} INTERFACE ${src_files})
+                    message(STATUS "Added all source files from ${child} as no precompiled property was specified.")
+                endif()
+
+                target_include_directories(${arduino_esp32_lib} INTERFACE "${libs_dir_abs}/${child}/src")
+                message(STATUS "Added include directory for ${child}")
+            else()
+                message(WARNING "Skipped ${child}: library.properties missing or src directory not found")
+            endif()
+        endif()
+    endforeach()
+endfunction()