[Groff] Fw: problem with pic

[Werner LEMBERG]

I'm forwarding this bug report to the list here; can someone please
test grap with non-GNU pic?

Ted, have you ever tried to run grap with, say, Dwight's dpic?  What
about heirloom's pic implementation?


    Werner
> --- Begin Message ---
>
>
>
> Subject: 
>
> problem with pic
>
>
>
>
> Date: 
>
> Sun, 9 Mar 2008 20:31:14 -0700
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>
>
>
>
> GROFF VERSION:
> various CVS versions since Dec 2006 up to current (1.19.3)
>
> MACHINE:
> x86 PC
>
> OS:
> Scientific Linux 4.2 (same as Redhat RHEL 4.2)
>
> COMPILER:
> gcc 3.4.6
>
> INPUT FILES:
>
> .\"  The next four lines are the pic input
> .PS
> line from 0,0 to 3,3
> line from 1,1 then up 1
> .PE
>
> COMMAND LINE:
>
> pic file-name | groff
>
> DESCRIPTION OF INCORRECT BEHAVIOUR:
>
> The second pic line above draws a line segment to the right
> and then a line segment up instead of just a line segment up.
> It works fine with version 1.19.2
>
> This breaks the grap program!
>
> It seems likely that this is related to the change below
> which is documented as:
>    If a path starts with \fBthen\fP, the first segment
>    is assumed to be into the current direction, using the
>    default length.
> However, in the input above the "then" does not start the path.
>
>    2006-03-21  Werner LEMBERG  
>
>            * src/preproc/pic/pic.y (object_spec THEN): For compatibility with
>            both DWB pic and dpic, make
>
>              right;
>              line then down;
>
>            equal to
>
>              right;
>              line right then down;
>
>            instead of
>
>              right;
>              line 0 then down;
>
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