DIRECTORY.entries

[Larry Rix]

Once we have a {DIRECTORY} object with 'entries', how do we determine which entries are subfolder directories and which are files easily and quickly?

[Gachoud Philippe]

Hi Larry,

personally I used DIRECTORY_ITERATOR which process_directory implementation holds differences between files and directories, I redefined this method to separate directories and files

Hope it helps

On Mon, Feb 24, 2020 at 5:50 PM Larry Rix <lar...@moonshotsoftware.com> wrote:

Once we have a {DIRECTORY} object with 'entries', how do we determine which entries are subfolder directories and which are files easily and quickly?

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[Finnian Reilly]

personally I used DIRECTORY_ITERATOR which process_directory implementation holds differences between files and directories, I redefined this method to separate directories and files

Slow method

I like to use EL_DIRECTORY (inherits DIRECTORY and accessible via EL_SHARED  DIRECTORY) which offers the following possibilities

	directories: EL_ARRAYED_LIST [EL_DIR_PATH]

	directories_with_extension (extension: READABLE_STRING_GENERAL): EL_ARRAYED_LIST [EL_DIR_PATH]

	entries: EL_ARRAYED_LIST [EL_PATH]

	entries_with_extension (extension: READABLE_STRING_GENERAL): EL_ARRAYED_LIST [EL_PATH]

	files: EL_SORTABLE_ARRAYED_LIST [EL_FILE_PATH]

	files_with_extension (extension: READABLE_STRING_GENERAL): like files

	recursive_directories: like directories

	recursive_files: like files

	recursive_files_with_extension (extension: READABLE_STRING_GENERAL): like files

Fast method

For recursive listings I also use EL_OS_ROUTINES_I accessible via EL_MODULE_OS which offers

	directory_list (a_dir_path: EL_DIR_PATH): like Find_directories_cmd.path_list

	file_list (a_dir_path: EL_DIR_PATH; a_file_pattern: READABLE_STRING_GENERAL): EL_FILE_PATH_LIST

Benchmarks

Despite the fact that the latter routines have to read the results from disk, they are still approximately 30% faster than the former routines because they make use of the native Linux/Windows commands find/dir respectively. These OS commands are highly optimized.

Benchmark to read C files from W_code directory (approx 4.2 K files)

SELECTED: Compare finding files with extension
Benchmark: list_w_code_c_files
Getting average time: el_directory (of 10 runs)
Getting average time: el_os_routines_i (of 10 runs)

Average execution times (in ascending order)
el_os_routines_i : 651.500 millisecs
el_directory     : +53%

-- Finnian