Re: [Bug-ed] GNU ed 1.11-rc1 released

[Antonio Diaz Diaz]

Andrew L. Moore wrote:
> Though documented otherwise in the ed man page (ed.1), the intent of 
> the command `zN' is to set the window size to N, which is persistent

Maybe, but 'z' also prints lines. And I would find it pretty strange 
that 'zN' prints anything other than N lines.


> In your current implementation (1.11rc1), on an N line display, only
> N - 2 lines of the buffer are displayed - the top line being the
> previous command.

Ed 1.11-rc1 uses the same 'N' as ed 0.2, but as 0.2 printed 'N+1' lines, 
the final result was to print 'display_height - 1' lines.

Maybe ed could set the initial 'N' to 'display_height - 1' lines. OTOH, 
I like to see the previous command on the top line. It shows that no 
lines have been scrolled out.


> On the other hand, you're in good company: ex(vim) exhibits this 
> (mis)behavior too.  And since the command `z' is explicitly omitted 
> from SUSv4, you pretty much have a free hand to define the behavior 
> as you wish.

I am not trying to define anything. 'zN' printing 'N+1' lines was 
reported as a bug and I agree it is probably a bug.


Martin Guy wrote:
> I don't have the source of the original Berkeley ed any more, but the
> original ex, which extends ed, behaves in the same way as the
> newly-corrected GNU ed, i.e. z10 prints 10 lines.

Thanks. Good to know that printing N lines is probably the "correct" 
behaviour.


Best regards,
Antonio.