Change font of gnome-shell globally

gnome-shell-set-font.sh

#!/usr/bin/env bash
#
# Author: Elijah Danko (me@elijahdanko.net)
# License: MIT
#
# Change font on Adwaita gnome-shell theme using gresource.
# You can adapt the script to adjust whatever you want.
#
# Tested on archlinux gnome-shell 3.34.2.
# Make sure that `gresource` and `glib-compile-resources` are located in the path.
#
# Usage: bash gnome-shell-set-font.sh <font>

set -euo pipefail

if [[ "$#" -ne 1 ]]; then 1>&2 echo "Font should be specified."; exit 1; fi

# Check requirements.
for cmd in \
    gresource \
    glib-compile-resources;
do
    if [[ ! $(command -v "$cmd") ]]; then
        1>&2 echo "$cmd not found in the path."; exit 1
    fi
done

# Extract gresources.
font_name="$1"
build_dir="$(readlink -f $(dirname "${BASH_SOURCE[0]}"))/build"
gst_path="/usr/share/gnome-shell"
gst="$gst_path/gnome-shell-theme.gresource"
gst_curr="$gst"
if [[ -f "$gst.ORIG" ]]; then gst_curr="$gst.ORIG"; fi
theme_path="$build_dir/org/gnome/shell/theme"

rm -rf "$build_dir"
mkdir -p "$theme_path"

for src in `gresource list $gst_curr`; do
    mkdir -p "$build_dir/$(dirname $src)"
    gresource extract $gst_curr $src > "$build_dir$src"
done

# Add new font.
find "$build_dir" -type f -name "*.css" | xargs sed -i -e "s/font-family:/font-family: $font_name,/g"
all_resources=$(find "$theme_path" -type f -printf "    <file>%P</file>\n")
cat <<EOF > "$theme_path/gnome-shell-theme.gresource.xml"
<?xml version="1.0" encoding="UTF-8"?>
<gresources>
  <gresource prefix="/org/gnome/shell/theme">
$all_resources
  </gresource>
</gresources>
EOF

# Compile and copy back.
pushd "$(pwd)" 1>/dev/null
cd "$theme_path"
glib-compile-resources gnome-shell-theme.gresource.xml
# Backup the original resource.
if [[ ! -f "$gst.ORIG" ]]; then sudo mv "$gst" "$gst.ORIG"; fi
sudo cp "gnome-shell-theme.gresource" "$gst"
popd 1>/dev/null