How I handle envvars

.bash_profile

[[ -f "$HOME/.profile" ]] && source "$HOME/.profile"
[[ $- == *i* && -f "$HOME/.bashrc" ]] && source "$HOME/.bashrc"

.bashrc

[[ -f "/etc/bashrc" ]] && source "/etc/bashrc"

.profile

set -a
eval "$(systemctl --user show-environment)"
set +a

00-envvars-kde.sh

#!/usr/bin/env sh
# This is in ~/.config/plasma-workspace/env/00-envvars.sh

# Exports all variables in ~/.config/environment.d/*.conf
set -a
eval "$(systemctl --user show-environment)"
set +a

00-envvars.fish

# This is in ~/.config/fish/conf.d/00-envvars.fish
systemctl_show_environment | source

systemctl_show_environment.fish

# This is in ~/.config/fish/functions/systemctl_show_environment.fish
function systemctl_show_environment -d "Formats output of `systemctl --user show-environment` for sourcing from fish"
	systemctl --user show-environment \
	| sed \
		# Skip read-only variables
		-e '/^_=/d; /^PWD=/d; /^SHLVL=/d' \
		# Add `set -x ` to the beginning of the line
		-e '/^XDG_\(DATA\|CONFIG\)_DIRS/ ! s/^/set -x /' \
		# Add `set --path -x ` to the beginning of the line for XDG_(DATA|CONFIG)_DIRS
		-e '/^XDG_\(DATA\|CONFIG\)_DIRS/ s/^/set --path -x /' \
		# Replace first = with a space
		-e 's/=\(.*\)/ "\1"/' \
		# Turn `$'(...)'` into `(...)`
		-e 's/"\$\(\'.*\'\)"$/\1/' \
		# Turn `:` to ` `, but not in DBUS_SESSION_BUS_ADDRESS or DISPLAY or SKIM_DEFAULT_OPTIONS
		-e '/\(DBUS_SESSION_BUS_ADDRESS\|DISPLAY\|SKIM_DEFAULT_OPTIONS\)/ ! s/:/" "/g'
end