[Boost-users] [program_options] format_paragraph chops words

From: Soren Soe (soren.soe_at_[hidden])
Date: 2008-08-27 13:35:15

Hi,

I have run into a problem with the program_options library chopping 
words when it formats help messages.  I have created a small code 
fragment that will duplicate the problem:

int main()
{
   std::string p = "\n1234 6789 1234 6789 1234 6789 1234";
   format_description(std::cout, p, 20, 44);
   return 0;
}

Results in this message:

                    1234 6789 1234 6789 123
                    4 6789 1234

In case formatting is not preserved, the 3'rd instance of '1234' is 
chopped into '123' with '4' on the next line.
I think there might be a bug in format_paragraph in the block that is 
supposed to prevent word chopping. Specifically, this piece of code:
             
// is last_space within the second half ot the
// current line
if ((unsigned)distance(last_space, line_end) <
        (line_length - indent) / 2)
{
   line_end = last_space;
}
 
should probably not subtract 'indent' from 'line_length' since this was 
already done at the very beginning of the function.

Thanks,
Soren Soe.

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