Hovacui - how to rotate the screen to portrait mode

[m040601]

This issue is about the 'hovacui' tool part of 'pdftoroff' suit.

Thanks again for this tool. Very usefull and very very underrated. Hope it keeps on
getting maintained.

I am on Archlinux,

Name            : pdftoroff
Version         : git-1
Description     : pdf conversion, scaling and viewing by blocks of text
Architecture    : x86_64
URL             : http://github.com/sgerwk/pdftoroff
Licenses        : GPL3
Groups          : None
Provides        : None
Depends On      : poppler-glib  ncurses  libx11
Optional Deps   : None
Required By     : None
Optional For    : None
Conflicts With  : None
Replaces        : None
Installed Size  : 357.90 KiB
Packager        : Unknown Packager
Build Date      : Thu 25 May 2023 12:39:31 PM WEST
Install Date    : Thu 25 May 2023 12:41:01 PM WEST
Install Reason  : Explicitly installed
Install Script  : No
Validated By    : None

I do not use a desktop. I do not boot X or Wayland. I use a framebuffer terminal
fbterm (or fbpad) and tmux.

I like to use my screen rotated, that is portrait mode.

I do this in Archlinux by adding this line to /etc/default/grub,

GRUB_CMDLINE_LINUX="fbcon=rotate:3"

So the "linux console" already shows up in portrait mode.

When I start my fbterm terminal I use this on its fbtermrc config file,

screen-rotate=3
It works wonderfully.

Everything that is just text works perfectly.

I use many framebuffer tools to view images, pdfs, videos. Examples, 'fbpdf',
'fim', 'fbi', 'ffplay' etc. Usually they are not aware that the screen is rotated.

So I have to tell these tools to rotate the framebuffer display also. Most
of them have a "-r" or "--rotate" flag to start the program with the screen rotated.

Or a short key "r" to rotate while using the program.

So you can say for ex. "rotate 90 degrees" or "rotate 180 degrees" (upside down)

I could not find a way to do that with 'hovacui'.

Is it possible ? Could you add this flag to the source code ?

Thanks in advance.