Re: [Gm2] ProgramArgs problem

[Christoph Schlegel]

Hello Carl,

thank you, of course it does help - the missing call to NextArg must have been 
gone by accident... and I read the snippet more than once but didn't see the 
error. Yes, one up in the list of unterminated loops.

Skipping over your remarks about the toolname itself there is a new problem now 
as the program

  cid:=ProgramArgs.ArgChan();
  WHILE ProgramArgs.IsArgPresent() DO
    TextIO.ReadToken(cid,str);
        STextIO.WriteString(str);
        STextIO.WriteLn;
        ProgramArgs.NextArg();  
  END; (* WHILE *)

now outputs empty lines. Providing one argument I get two empty lines but no 
printed argument. From the number of lines it seems the toolname is the first 
argument.

I think p1 Modula-2 also doesn't skip the toolname 
(http://modula2.awiedemann.de/manual/lib1.html#L1_3_7).

Regards,
Christoph


On Sat, 6 Apr 2013 18:11:39 -0700 (PDT)
Carl Glassberg <address@hidden> wrote:

> Greetings:
> 
> I wonder if you need to call ProgramArgs.NextArg() within the loop, so you 
> can process all the named arguments? A simple mistake, I have by mistake 
> created my share of loops that don't terminate!
> 
> Also, if in Unix-like operating system, the command-line tool-name is always 
> the first argument, don't you need to call ProgramArgs.NextArg() before the
> loop to skip the program name? This depends on the implementation because I 
> know that ADW/Stony Brook m2 already skips over the tool name so you don't 
> call NextArg before the loop.
> 
> Also, I have sample text filters that process named input files in a loop but 
> I only call ProgramArgs.ArgChan() after first checking if there is an 
> argument (after skipping the toolname itself just before the loop.
> 
> See Google Code under the name "m2-text-filters" at
> <http://code.google.com/p/m2-text-filters/> and each filter has its own Wiki 
> page with the source.
> I have not tried these filters using Gm2, only p1 Modula2.
> 
> I don't know if this will help.
> 
> Sincerely
> Carl Glassberg
> ---
> 
> 


-- 
Christoph Schlegel <address@hidden>