D is great for small utility programs

Thu, 2013-02-28 20:37 | by Samuel Lampa

Look how little code is needed to read from stdin, and do something with eash line of the output, in the D programming language:

import std.stdio;
 
void main() {
  foreach(line; stdin.byLine()) {
    writeln("Got input line: ", line);
  }
}

Compile the above code with:

dmd dtest.d -of"dtest"

... and pipe some output to the newly created binary:

ls -l | ./dtest

This should make D a perfect language for creating small utility apps for parsing text, that you can pipe to!

Comments

by simendsjo | Tue, 2013-03-05 09:32

Note that D also supports shebang.

#!/usr/bin/rdmd
import std.stdio;
void main() {
// code
}

$ chmod +x dtest.d
$ ./dtest.d
$ ls -l | ./dtest