Re: mom and custom page sizes

[Deri]

On Friday, 14 October 2022 17:12:42 BST Marcus Brownlow wrote:
> Hi all,
> 
> I'm new to groff and am having some trouble understanding how custom page
> sizes work. I'm using the mom macro and pdfmom 1.22.4 on the linux command
> line.
> 
> My simple document (below) works fine with default settings (US letter, 1"
> margins); with .PAPER A4 (A4 paper as expected); but has the following
> problems when .PAGE is used:
> 
> 1. Paper size defaults to US Letter
> 2. Line length seems to obey the custom paper width
> 3. Page specifications are ignored in the vertical dimension in favor of US
> Letter height
> 
> I do not understand this behavior at all. I've been a LaTeX user for many
> years and wonder if I'm just approaching groff/mom with the wrong headspace
> and set of assumptions about how it should work.
> 
> Thanks for your help.
> 
> --
> In this example, I am expecting a custom page size of 15cm x 15cm with 1cm
> margins, but the PDF shows US Letter paper, correct line length but US
> Letter page height instead of 15cm.
> 
> .TITLE "This is a title"
> .AUTHOR "I am the author"
> .DOCTYPE DEFAULT
> .COPYSTYLE  FINAL
> .PRINTSTYLE TYPESET
> .PT_SIZE 14
> .PAGE 15c 15c 1c 1c 1c 1c
> .START
> Adduser addgroup agetty alias anacron apropos apt apt-get, wc grep head
> hostname comm bc chown, tee clear mv rmdir xargs lsusb. Chown date bzip ln
> shutdown ifconfig grep uname rdiff-backup history, gzip  atq vim arch
> dmidecode groups iostat adduser, nmap mkdir df ionice youtube-dl cat kill
> locate. Find locate bzip hwinfo sudo cp wall who hwclock, nproc adduser
> nice bc yes rm scp whereis, killall ls whatis addgroup xargs df
> hostnamectl. Iostat apropos dmidecode nano top touch lshw vi more pidof
> killall ln, history adduser grep wall hostname gunzip apt-get shutdown head
> ifconfig man, vim dir free df atq echo wc zip su alias. Man shutdown zip
> killall su yes hwinfo agetty groups cal, mv ls ping mkdir which gzip sleep
> youtube-dl tr hostname, iostat nmap w factor reboot top ifconfig cat. Mv
> free man cp rename tr bzip zdiff gunzip rm, nano watch sleep clear w users
> du ln, groups sort eject top rdiff-backup anacron env uptime. Cat factor
> grep anacron head tree cal pstree, nc time env clear hostnamectl ps exit,
> agetty login adduser dd bzip shutdown.
> 
> $ pdfmom example.mom > example-custom-15x15.pdf

If you set DOCTYPE SLIDES you will find the pdf is the correct size, but you 
lose the author/title section. The reason is because in the macro DEFAULTS 
which is called from START sets the papersize for gropdf to LETTER, or the 
value set by .PAPER, for any DOCTYPE except SLIDES.

Cheers

Deri