Re: page reference , page foward reference

[Ralph Corderoy]

Hi Marko,

> i realize if i add a cover page , that the page number does not exact
> work, i get a wrong page number.

My new test code.

    $ cat ref.tr
    .nr H1dot 0
    .
    .INITR index
    .
    .COVER
    .TL title
    .AU author
    .COVEND
    .
    .H 1 Introduction
    .SETR intro
    .
    Chapter
    .GETHN epi
    \& on page
    .GETPN epi
    \& is well worth a peruse.
    .
    .H 2 Sub-introduction
    .SETR subintro
    .
    .SK
    .
    .H 1 Epilogue
    .SETR epi
    .
    .GETHN intro s
    Read fine chapter \*s,
    .GETHN subintro s
    including sub-chapter \*s.
    $

I agree the output is wrong.

    $ mmroff -Tascii ref.tr | grep .
                                      author
                                November 21, 2019
                                       - 2 -
           1  Introduction
           Chapter 2 on page 2 is well worth a peruse.
           1.1  Sub-introduction
                                       - 3 -
           2  Epilogue
           Read fine chapter 1, including sub-chapter 1.1.
    $

This is because there are two `current' page numbers being used.
There's troff's number register called `%', and another number register
that mm maintains called `P'.

The default page header uses P.

    .ds pg*header ''- \\nP -''

The COVEND pulls in /usr/share/groff/1.22.4/tmac/mm/ms.cov that resets %
back to 1 so the page after the cover page is page 1.

    .bp 1

SETR uses % when defining the reference.

    .       ds \\*[qrf*name]-pn \\n[%]

This inconsistency seems wrong.  Better heads, and those with more time,
need to take a look.  :-)  I may have worked around it by altering the
start of the code to be

    .nr H1dot 0
  + .nr P -1
    .
    .INITR index

    $ mmroff -Tascii ref.tr | grep .
                                      author
                                November 21, 2019
                                       - 1 -
           1  Introduction
           Chapter 2 on page 2 is well worth a peruse.
           1.1  Sub-introduction
                                       - 2 -
           2  Epilogue
           Read fine chapter 1, including sub-chapter 1.1.
    $

But this shouldn't be needed AFAICS.

-- 
Cheers, Ralph.