add gpu power usage monitor

scripts/dracula.sh

@@ -145,6 +145,10 @@ main()
       IFS=' ' read -r -a colors <<< $(get_tmux_option "@dracula-gpu-ram-usage-colors" "cyan dark_gray")
       script="#($current_dir/gpu_ram_info.sh)"
 
+    elif [ $plugin = "gpu-power-draw" ]; then
+      IFS=' ' read -r -a colors <<< $(get_tmux_option "@dracula-gpu-power-draw-colors" "green dark_gray")
+      script="#($current_dir/gpu_power.sh)"
+
     elif [ $plugin = "cpu-usage" ]; then
       IFS=' ' read -r -a colors <<< $(get_tmux_option "@dracula-cpu-usage-colors" "orange dark_gray")
       script="#($current_dir/cpu_info.sh)"

scripts/gpu_power.sh

@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+# setting the locale, some users have issues with different locales, this forces the correct one
+export LC_ALL=en_US.UTF-8
+
+current_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+source $current_dir/utils.sh
+
+get_platform()
+{
+  case $(uname -s) in
+    Linux)
+      gpu=$(lspci -v | grep VGA | head -n 1 | awk '{print $5}')
+      echo $gpu
+      ;;
+
+    Darwin)
+      # TODO - Darwin/Mac compatability
+      ;;
+
+    CYGWIN*|MINGW32*|MSYS*|MINGW*)
+      # TODO - windows compatability
+      ;;
+  esac
+}
+
+get_gpu()
+{
+  gpu=$(get_platform)
+  if [[ "$gpu" == NVIDIA ]]; then
+    usage=$(nvidia-smi --query-gpu=power.draw,power.limit --format=csv,no header,nounits | awk '{ draw += $0; max +=$2 } END { printf("%dW/%dW\n", draw, max) }')
+
+  else
+    usage='unknown'
+  fi
+  normalize_percent_len $usage
+}
+
+main()
+{
+  # storing the refresh rate in the variable RATE, default is 5
+  RATE=$(get_tmux_option "@dracula-refresh-rate" 5)
+  gpu_label=$(get_tmux_option "@dracula-gpu-usage-label" "GPU")
+  gpu_usage=$(get_gpu)
+  echo "$gpu_label $gpu_usage"
+  sleep $RATE
+}
+
+# run the main driver
+main