Commmandline arguments and UTF8 error

[Daniel Keep]

Jacob Carlborg wrote:
> On 2010-02-22 15.39, Nils Hensel wrote:
>> Daniel Keep schrieb:
>>> If you look at the real main function in src\phobos\internal\dmain2.d,
>>> you'll see this somewhere around line 109 (I'm using 1.051, but it's
>>> unlikely to be much different in an earlier version):
>>>
>>>> for (size_t i = 0; i<  argc; i++)
>>>> {
>>>>      auto len = strlen(argv[i]);
>>>>      am[i] = argv[i][0 .. len];
>>>> }
>>>>
>>>> args = am[0 .. argc];
>>>>
>>>> result = main(args);
>>>
>>> In other words, Phobos never bothers to actually convert the arguments
>>> to UTF-8.
>>
>> Hmm, I really can't see any benefit. Did Walter ever comment on this
>> matter? Surely, I can't be the only one who is unable to use D for
>> something as mundane as a command line tool that takes file names for
>> arguments?
>>
>>> Tango does (tango\core\rt\compiler\dmd\rt\dmain2.d:238 for a recent-ish
>>> trunk).
>>
>> Actually I was trying to avoid Tango. For one I'm not too fond of the
>> interface [Stdout.format(...).newline just seems awkward und
>> unnecessarily complicated compared to writef(...)].

It *is* more verbose.  It's one of the few things I've never liked about
Tango.

That said, the justification for it is that Stdout.format /
Stdout.formatln is significantly clearer.  Plus, you also get an Stderr
version as well.

>> Also, I use derelict
>> which I don't believe supports Tango yet.

I'm fairly certain it should.  I'm positive I've used them together in
the past.

>> And I liked the
>> out-of-the-box-feeling of Phobos which is supposedly the standard.

That's a bit like not using Boost because there's the C standard library.

Whilst Tango is not a strict superset of Phobos, it generally does more
and does it better.  For example, it actually makes the effort to decode
command line arguments.  :P

> You can use derelict with tango. I can agree you about Stdout.format,
> You can create wrappers like this:
> 
> void writeln (ARGS...) (ARGS args)
> {
>     foreach (arg ; args)
>         Stdout(arg);
> 
>     Stdout().newline;
> }
> 
> void writefln (ARGS...) (char[] str, ARGS args)
> {
>     foreach (arg ; args)
>         Stdout.format(str, arg);
> 
>     Stdout().newline;
> }

Shouldn't that be

void writefln(Args...)(char[] str, Args args)
{
    Stdout.formatln(str, args);
}

Incidentally, you don't need the `()`s before `.newline`.

>> Guess I have to make up my mind if all the extra hassle of installing
>> and learning (and updating) another and utterly different "standard"
>> library outweighs the benefits of developing in D.

Having written projects using both Phobos and Tango (not in the same
project, mind you), I'd say Tango is very much worth the effort.

Just... just don't use the Zip module.  It's complete and utter crap.