cmake: allow source_group to preserve file-system tree (for MSVS)

cmake/OpenCVUtils.cmake

@@ -1,3 +1,22 @@
+# Debugging function
+function(ocv_cmake_dump_vars)
+  cmake_parse_arguments(DUMP "" "TOFILE" "" ${ARGN})
+  set(regex "${DUMP_UNPARSED_ARGUMENTS}")
+  get_cmake_property(_variableNames VARIABLES)
+  set(VARS "")
+  foreach(_variableName ${_variableNames})
+    if(_variableName MATCHES "${regex}")
+      set(VARS "${VARS}${_variableName}=${${_variableName}}\n")
+    endif()
+  endforeach()
+  if(DUMP_TOFILE)
+    file(WRITE ${CMAKE_BINARY_DIR}/${DUMP_TOFILE} "${VARS}")
+  else()
+    message(AUTHOR_WARNING "${VARS}")
+  endif()
+endfunction()
+
+
 # Search packages for host system instead of packages for target system
 # in case of cross compilation thess macro should be defined by toolchain file
 if(NOT COMMAND find_host_package)
@@ -601,7 +620,35 @@ endmacro()
 ################################################################################################
 # short command to setup source group
 function(ocv_source_group group)
-  cmake_parse_arguments(OCV_SOURCE_GROUP "" "" "GLOB" ${ARGN})
-  file(GLOB srcs ${OCV_SOURCE_GROUP_GLOB})
-  source_group(${group} FILES ${srcs})
+  cmake_parse_arguments(SG "" "DIRBASE" "GLOB;GLOB_RECURSE;FILES" ${ARGN})
+  set(files "")
+  if(SG_FILES)
+    list(APPEND files ${SG_FILES})
+  endif()
+  if(SG_GLOB)
+    file(GLOB srcs ${SG_GLOB})
+    list(APPEND files ${srcs})
+  endif()
+  if(SG_GLOB_RECURSE)
+    file(GLOB_RECURSE srcs ${SG_GLOB_RECURSE})
+    list(APPEND files ${srcs})
+  endif()
+  if(SG_DIRBASE)
+    foreach(f ${files})
+      file(RELATIVE_PATH fpart "${SG_DIRBASE}" "${f}")
+      if(fpart MATCHES "^\\.\\.")
+        message(AUTHOR_WARNING "Can't detect subpath for source_group command: Group=${group} FILE=${f} DIRBASE=${SG_DIRBASE}")
+        set(fpart "")
+      else()
+        get_filename_component(fpart "${fpart}" PATH)
+        if(fpart)
+          set(fpart "/${fpart}") # add '/'
+          string(REPLACE "/" "\\" fpart "${fpart}")
+        endif()
+      endif()
+      source_group("${group}${fpart}" FILES ${f})
+    endforeach()
+  else()
+    source_group(${group} FILES ${files})
+  endif()
 endfunction()