I was waiting for a stable version of C++17 ( standard library )
to add some features of fileSystem in C++17 to my program that
wants to iterate through all files in a directory recursively.
I was thinking how could I do for implementing that and add it to
my program.
Now after starting to learn D ( nearby 2 weeks so far ). I can do
it in 6 lines!
void main( string[] args ){
string[] all_file_name = dirEntries( ".", SpanMode.depth, false
)
.filter!( file => !file.name.matchFirst( regex( args[ 1
] ) ).empty() )
.filter!( file => ( args[ 2 ] == "-f" || args[ 2 ] ==
"-d" ? ( args[ 2 ] == "-f" ? !file.isDir : !file.isFile ) : (
!file.isSymlink ) ) )
.map!( file => file.name )
.array;
foreach( string item; all_file_name ) writeln( item );
}
./bin-file '[A-Z]$' -f ---> print all files that are matched
against [A-Z]$
./bin-file '[A-Z]$' -d ---> print all directory that are
matched against [A-Z]$
./bin-file '[A-Z]$' "anything-else" ---> print both files and
directory that are matched against [A-Z]$
I am so happy since after more than one year practicing in C++
and putting a collection more than 2000 examples of C++ on my
github, I was not sure I could do it in 6 lines.
May it is a Spam but I think it is worth it.
