SYNOPSIS

     use File::Create::Layout qw(create_files_using_layout);
    
     my $res = create_files_using_layout(layout => <<'EOL');
     file1.txt
     file2(0600)
     file3.txt(0644) "content":"hello, world\n"
     dir1/
       file1
       file2
       file3
    
     dir2/(root,bin,0600)
       # some comment
       file1
       dir3/
         anotherfile.txt "content":"secret"
       file2
     EOL

DESCRIPTION

    EARLY DEVELOPMENT. MORE OPTIONS WILL BE AVAILABLE (E.G. DRY-RUN,
    CHECKING A LAYOUT AGAINST FILESYSTEM, VARIOUS ERROR HANDLING OPTIONS).

    OWNERSHIP SETTING NOT YET IMPLEMENTED.

LAYOUT SPECIFICATION

    Layout is a text document containing one or more files. Each line is
    either a file/directory specification, or a blank line, or a comment.
    Comment starts with zero or more whitespaces, a # (hash) character, and
    zero or more non-newline characters as the comment's content.

    The simplest specification line contains just the name of the file or
    directory. To specify a directory, you need to end with / (slash):

     # a file
     foo.txt
    
     # a directory
     bar/
    
     # another directory
     baz.txt/

    To specify filename containing special characters, like #, you can
    quote the file using double quotes:

     "#tmpname#"
     "filename containing \"quotes\""

    To be exact, the string will be parsed as a JSON string.

    Permission and ownership. Immediately after the filename or directory
    name, you can specify permission mode, as well as ownership (owner
    user/group):

     # specify permission mode, both are identical
     file.txt(0600)
     file2.txt(600)
    
     # specify owner as well as user+group
     dir1/(ujang,admin.0700)

    Symlink. To create a symlink, add -> (arrow) with the symlink target.
    Symlink target can be a quoted JSON string if you want to express
    whitespace or other special characters:

     symlink1 -> ../target
     symlink2 -> "/home/ujang/My Documents"

    File content. An unquoted JSON hash (object) can be added in the end,
    separated by a whitespace, e.g. to specify file content (and other
    extra stuffs in the future). By unquoted, it means that the enclosing
    curly braces { .. } is not written:

     file.txt "content":"This is line 1\nThis is line 2\n"
     file2.txt(0660)  "content":"secret"

    Putting files/directories in a subdirectory. Indentation (only spaces,
    tabs are not allowed) is used for this:

     dir1/
       file1-inside-dir1
       file2-inside-dir1
       dir2/
         file3-inside-dir2
         file4-inside-dir2
       another-file-inside-dir1
     file5-in-top-level
     file6