What are the worst parts of D?

[ketmar via Digitalmars-d]

On Mon, 06 Oct 2014 13:34:23 +0200
Martin Drašar via Digitalmars-d <digitalmars-d at puremagic.com> wrote:

> Ok, thanks for your answers. If you get your code to publishable
> state, I am sure a lot of people will be interested.
as i can't publish my current version of cmdcon, i decided to write
another one from scratch. it contains alot less of mixin() codegens,
can do everything cmdcon.d can do and has structs/classes already
working. this is the excerpt from testing code:


import cong; // our console module

@ConName("intVar00")
@ConHelp("simple int variable")
@ConDescription("this is just an int variable.\nordinary one, nothing
special.")
__gshared int v0 = 42;

__gshared string v1 = "hi!";

class A {
  int i = 42;
  string s = "hello";
  this () {}
  this (string v) { s = v; }
  int bar () { writeln("BAR: s=", s); return 666; }
  void foo (float[] ff) {}
}

__gshared A a; // yes, this can be null

void foo (int n, string s="hi", double d=0.666) {
  writefln("n=%s; s=[%s]; d=%s", n, s, d);
}

struct S {
  int i = 666;
  string s = "bye";
  int sbar () { writeln("SBAR: s=", s); return 666; }
  void sfoo (float[] ff) {}
}

__gshared S s;
S s1;


void main (string[] args) {
  writeln("known commands:");
  foreach (auto n; conGetKnownNames()) writeln("  ", n);
  writeln("---");

  a = new A();
  conExecute("a bar"); // virtual method call for object instance
  a.s = "first change";
  conExecute("a bar");
  a = new A("second change");
  conExecute("a bar");  // virtual method call for ANOTHER object
  instance

  foreach (auto arg; args[1..$]) {
    try {
      writeln("# ", arg);
      conExecute(arg);
    } catch (Exception e) {
      writeln("***ERROR: ", e.msg);
    }
  }
}

mixin(ConRegisterAll); // register 'em all!

==========

known commands:
  intVar00
  a
  foo
  v1
  s
---
(autoregistration rocks!)

some sample commands and results:

# intVar00
intVar00 42 (Int)
# foo 42
n=42; s=[hi]; d=0.666
# a i
a.i 42 (Int)
# a bar
BAR: s=second change
# s sbar
SBAR: s=bye


by default `mixin(ConRegisterAll);` tries to register all suitable
public symbols. one can use @ConIgnore UDA to ignore symbol and some
other UDAs to change name, add help and so on. alas, there is no way to
get Ddoc info in compile-time (what a pity!).

you can't register pointer objects (i.e. `__gshared int *a` will not
pass). it's doable (class fields are such objects internally), but i
just don't need this.

i also found some bugs in compilers (both dmd and gdc), but aren't
ready to dustmite and report 'em yet. GDC just segfaults now, but DMD
works.

there is also bug in CDGC, which took me a whole day of useless code
motion (i forgot that i'm using DMD built with CDGC ;-).


so the base mechanics is in place, i need to debug some things and
write simple sample with eventloop and telnet.

new code includes only WTFPL'ed parts, so it probably will be WTFPLed
too.


hope to finish this until weekend.
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