[rcore] Add filtering folders to LoadDirectoryFilesEx()/`ScanDirect…

…oryFiles()` (#4302)

* Add filtering folders in ScanDirectoryFiles and ScanDirectoryFilesRecursively

Add define FILTER_FOLDER for that purpose
Fix folder names matching filter being added to result

* Move FILTER_FOLDER define to internals of rcore and document option in comment

src/raylib.h

@@ -1126,7 +1126,7 @@ RLAPI bool ChangeDirectory(const char *dir); // Change work
 RLAPI bool IsPathFile(const char *path); // Check if a given path is a file or a directory
 RLAPI bool IsFileNameValid(const char *fileName); // Check if fileName is valid for the platform/OS
 RLAPI FilePathList LoadDirectoryFiles(const char *dirPath); // Load directory filepaths
-RLAPI FilePathList LoadDirectoryFilesEx(const char *basePath, const char *filter, bool scanSubdirs); // Load directory filepaths with extension filtering and recursive directory scan
+RLAPI FilePathList LoadDirectoryFilesEx(const char *basePath, const char *filter, bool scanSubdirs); // Load directory filepaths with extension filtering and recursive directory scan. Use "/DIR" in the filter string to include directories in the result
 RLAPI void UnloadDirectoryFiles(FilePathList files); // Unload filepaths
 RLAPI bool IsFileDropped(void); // Check if a file has been dropped into window
 RLAPI FilePathList LoadDroppedFiles(void); // Load dropped filepaths

src/rcore.c

@@ -251,6 +251,10 @@ unsigned int __stdcall timeEndPeriod(unsigned int uPeriod);
  #define MAX_AUTOMATION_EVENTS 16384 // Maximum number of automation events to record
 #endif
 
+#ifndef FILTER_FOLDER
+ #define FILTER_FOLDER "/DIR" // Filter string used in ScanDirectoryFiles, ScanDirectoryFilesRecursively and LoadDirectoryFilesEx to include directories in the result array
+#endif
+
 // Flags operation macros
 #define FLAG_SET(n, f) ((n) |= (f))
 #define FLAG_CLEAR(n, f) ((n) &= ~(f))
@@ -3339,10 +3343,21 @@ static void ScanDirectoryFiles(const char *basePath, FilePathList *files, const
 
  if (filter != NULL)
  {
- if (IsFileExtension(path, filter))
+ if (IsPathFile(path))
  {
- strcpy(files->paths[files->count], path);
- files->count++;
+ if (IsFileExtension(path, filter))
+ {
+ strcpy(files->paths[files->count], path);
+ files->count++;
+ }
+ }
+ else
+ {
+ if (TextFindIndex(filter, FILTER_FOLDER) >= 0)
+ {
+ strcpy(files->paths[files->count], path);
+ files->count++;
+ }
  }
  }
  else
@@ -3402,7 +3417,22 @@ static void ScanDirectoryFilesRecursively(const char *basePath, FilePathList *fi
  break;
  }
  }
- else ScanDirectoryFilesRecursively(path, files, filter);
+ else 
+ {
+ if (filter != NULL && TextFindIndex(filter, FILTER_FOLDER) >= 0)
+ {
+ strcpy(files->paths[files->count], path);
+ files->count++;
+ }
+
+ if (files->count >= files->capacity)
+ {
+ TRACELOG(LOG_WARNING, "FILEIO: Maximum filepath scan capacity reached (%i files)", files->capacity);
+ break;
+ }
+
+ ScanDirectoryFilesRecursively(path, files, filter);
+ }
  }
  }