Tech Memorandums

Terminals in 2019

Modern terminals

Most recent terminal emulators have removal of cruft as a goal. Having used the oldest of the modern terminal emulators, rxvt-unicode for almost 10 years, the pain points were:

The last point is unavoidable but to address the first two, I decided to use st combined with mtm for multiplexing.

Pros

Cons

mtm

mtm can be found at https://github.com/deadpixi/mtm. I did not package it for Debian as I kept the install local to my user for testing.

make terminfo-install is required to install the terminfo entries into ~/.terminfo.

st

exec stterm \
     -a \
     -f "Ubuntu Mono derivative Powerline:style=Regular:pixelsize=14:antialias=true" \
     -T $(hostname) \
     -e mtm -t mtm-256color -c x
#    -f "Go Mono:style=Regular:pixelsize=9:antialias=true" \
#    -a 

This is installed as ~/bin/st.sh. i3/sway uses this script to lauch terminals.

Test with,

curl https://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-demo.txt

Sway

Setting up the terminals led me to finally moving to Wayland on the venerable weyl. However, sway is not in Debian yet. At the time of writing 1.1.1-1 was in experimental but 1.2 has been out for a month. I would have to setup a pipeline.

Building

First, you need wlroots:

cd ~/src/debian
git clone https://salsa.debian.org/swaywm-team/wlroots
curl -L https://github.com/swaywm/wlroots/archive/0.7.0.tar.gz -o wlroots_0.7.0.orig.tar.gz
cd wlroots
debuild -uc -us
cd ..
sudo dpkg -i libwlroots3_0.7.0-1_amd64.deb libwlroots-dev_0.7.0-1_amd64.deb

Then you can get sway

cd ~/src/debian
git clone https://salsa.debian.org/swaywm-team/sway
curl -L https://github.com/swaywm/sway/archive/1.2.tar.gz -o sway_1.2.orig.tar.gz
cd sway
debuild -uc -us

Marvel at the compile blazing along (ccache ftw) but seriosuly the text just flies. CPU usage is fine. Now, we hit the first hiccup:

../sway/ipc-json.c:92:9: error: macro "__DATE__" might prevent reproducible builds [-Werror=date-time]
   92 |  sscanf(SWAY_VERSION, "%u.%u.%u", &major, &minor, &patch);
      |         ^~~~~~~~~~~~

Some hacking later, we produce the hack that lets us proceed.

cat debian/patches/0003-Make-reproducible.patch
--- a/meson.build
+++ b/meson.build
@@ -134,7 +134,7 @@ if git.found()
 	git_commit_hash = run_command([git.path(), 'describe', '--always', '--tags'])
 	git_branch = run_command([git.path(), 'rev-parse', '--abbrev-ref', 'HEAD'])
 	if git_commit_hash.returncode() == 0 and git_branch.returncode() == 0
-		version = '"@0@ (" __DATE__ ", branch \'@1@\')"'.format(git_commit_hash.stdout().strip(), git_branch.stdout().strip())
+		version = '"@0@ (branch \'@1@\')"'.format(git_commit_hash.stdout().strip(), git_branch.stdout().strip())
 	endif
 endif
 add_project_arguments('-DSWAY_VERSION=@0@'.format(version), language: 'c')

This is committed to the reproducible branch. Packages are built and installed.

Configuration

cd ~/dotfiles
cp -r i3 sway
cd sway/.config
mv i3 sway

Some light config file editing based on the example config file in /etc/sway/config. Sway does not use /etc/default/keyboard so it is necessary to add a section to config:

input "1:1:AT_Translated_Set_2_keyboard" {
    xkb_model pc105
    xkb_layout us
    xkb_variant ,nodeadkeys
    xkb_options ctrl:nocaps,compose:menu
}

It is also necessary to install xwayland else nothing is displayed. Also remember to chmod u+s /usr/bin/sway.

QT5 supports Wayland.

export QT_QPA_PLATFORM=wayland

Alternatively, add -platform wayland to the command line invocation. However, the quassel-client in sid is not built with wayland support.

Problems and solutions

There does not seem to be any easy way of configuring xmodmap. This is needed to move the PageUp/Down keys.

Avoiding PgUp and and PgDn keys altogether as it interferes with learning the UHK and OSX. Installed Shortkeys to add M-p and M-n for tab navigation.

stterm runs within xwayland and nice fonts look like crap. kitty, from the repo isn’t much better. This appears to be a sway bug.

kitty can be made to look almost as good as rxvt-unicode on X by using decent fonts.

Only applets supporting StatusNotifierItem are shown in swaybar. This lets out wicd and even nm.

Using TUI instead.

Emacs gets some ugly, unstyled scrollbars.

Move Emacs styling back to Xresources.