Add tweak-cpu-usage script.

This limits CPU usage of firefox and vencord to avoid unnecessary excess CPU heat.

home/dotfiles/config/systemd/user/tweak-cpu-usage.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=Tweak CPU usage
+
+[Service]
+Type=simple
+ExecStart=%h/.local/bin/tweak-cpu-usage
+Restart=on-failure
+
+[Install]
+WantedBy=default.target

home/dotfiles/local/bin/tweak-cpu-usage

@@ -0,0 +1,36 @@
+#!/bin/bash
+set -e
+set -u
+
+cores=$(nproc)
+
+limits=(
+  # process_name:limit%
+  firefox:$(( 50 * cores ))
+  vesktop:$(( 20 * cores ))
+)
+
+# check for cpulimit command
+if ! command -v cpulimit 2>/dev/null >/dev/null; then
+  echo "ERROR: need cpulimit command" >&2
+  exit 1
+fi
+
+limit_process() {
+  local process_name="$1"
+  local limit_percentage="${2%%.}"
+
+  cpulimit -i -e "$process_name" -l "$limit_percentage"
+}
+
+limit_processes() {
+  local pids
+  pids=()
+  for limit in "${limits[@]}"; do
+    IFS=: read process_name limit_percentage <<<"$limit"
+    limit_process "$process_name" "$limit_percentage" & pids+=($!) 
+  done
+  wait "${pids[@]}"
+}
+
+limit_processes

install.sh

@@ -61,3 +61,9 @@ install_files "/etc" etc
 if command -v fc-cache >/dev/null 2>&1; then
 	fc-cache -f
 fi
+
+if command -v systemctl >/dev/null 2>&1; then
+	systemctl --user daemon-reload
+	systemctl --user enable tweak-cpu-usage
+	systemctl --user restart tweak-cpu-usage
+fi