Start Emacs daemon as a systemd service

systemd/.config/systemd/user/emacs.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Emacs: the extensible, self-documenting text editor
+After=save-environment-variables@emacs.service
+Requires=save-environment-variables@emacs.service
+
+[Service]
+Type=forking
+ExecStart=/usr/bin/emacs --daemon
+ExecStop=/usr/bin/emacsclient --eval "(kill-emacs)"
+Restart=always
+
+[Install]
+WantedBy=default.target

systemd/.config/systemd/user/save-environment-variables@.service

@@ -0,0 +1,9 @@
+[Unit]
+Description=Save specific environment variables
+
+[Service]
+Type=oneshot
+ExecStart=/home/chelys/usr/bin/save-environment-variables %h/.config/systemd/user/%i.service.d/env.conf PATH XDG_CONFIG_HOME XDG_DATA_HOME
+
+[Install]
+WantedBy=default.target

systemd/usr/bin/save-environment-variables

@@ -0,0 +1,18 @@
+#!/usr/bin/env zsh
+
+output=$1
+shift
+
+source $HOME/.profile
+
+# Make sure the output directory exists.
+[[ -d "$(dirname $output)" ]] || mkdir -p "$(dirname $output)"
+
+echo "[Service]" > "$output"
+
+# Write down all the environment variables.
+for env in $@; do
+    echo "Environment=\"${env}=${(P)env}\""
+done >> "$output"
+
+systemctl --user daemon-reload