CMake: Use source_groups to represent the source tree (#1247)

src/cmake/macros/GroupSources.cmake

@@ -0,0 +1,46 @@
+# Copyright (C) 2008-2018 TrinityCore <https://www.trinitycore.org/>
+#
+# This file is free software; as a special exception the author gives
+# unlimited permission to copy and/or distribute it, with or without
+# modifications, as long as this notice is preserved.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+macro(GroupSources dir)
+  # Skip this if WITH_SOURCE_TREE is not set (empty string).
+  if (NOT ${WITH_SOURCE_TREE} STREQUAL "")
+    # Include all header and c files
+    file(GLOB_RECURSE elements RELATIVE ${dir} *.h *.hpp *.c *.cpp *.cc)
+
+    foreach(element ${elements})
+      # Extract filename and directory
+      get_filename_component(element_name ${element} NAME)
+      get_filename_component(element_dir ${element} DIRECTORY)
+
+      if (NOT ${element_dir} STREQUAL "")
+        # If the file is in a subdirectory use it as source group.
+        if (${WITH_SOURCE_TREE} STREQUAL "flat")
+          # Build flat structure by using only the first subdirectory.
+          string(FIND ${element_dir} "/" delemiter_pos)
+          if (NOT ${delemiter_pos} EQUAL -1)
+            string(SUBSTRING ${element_dir} 0 ${delemiter_pos} group_name)
+            source_group("${group_name}" FILES ${dir}/${element})
+          else()
+            # Build hierarchical structure.
+            # File is in root directory.
+            source_group("${element_dir}" FILES ${dir}/${element})
+          endif()
+        else()
+          # Use the full hierarchical structure to build source_groups.
+          string(REPLACE "/" "\\" group_name ${element_dir})
+          source_group("${group_name}" FILES ${dir}/${element})
+        endif()
+      else()
+        # If the file is in the root directory, place it in the root source_group.
+        source_group("\\" FILES ${dir}/${element})
+      endif()
+    endforeach()
+  endif()
+endmacro()