Make rofi-powermenu configurable through env vars

Added Environment variables to show/hide the text and icons, as well as
change the individual commands rofi-powermenu uses to affect the system.

.config/rofi/modes/powermenu

@@ -1,34 +1,65 @@
 #!/usr/bin/env sh
 
-#### User Options ###
+#### Environment Variable Options ###
+# Interface options
+# ROFI_POWERMENU_SHOW_ICONS=1
+# ROFI_POWERMENU_SHOW_TEXT=0
+#  Command options
+# ROFI_POWERMENU_SHUTDOWN_CMD=""
+# ROFI_POWERMENU_REBOOT_CMD=""
+# ROFI_POWERMENU_LOCKSCREEN_CMD=""
+# ROFI_POWERMENU_LOGOUT_CMD=""
+# ROFI_POWERMENU_SUSPEND_CMD=""
 
 #### Menu Options ###
+if [ "${ROFI_POWERMENU_SHOW_TEXT:-0}" -eq 0 ] && [ "${ROFI_POWERMENU_SHOW_ICONS:-1}" -eq 0 ]; then
+  echo "You disabled both text and icons for rofi-powermenu, nothing can be shown."
+  exit 1
+elif [ "${ROFI_POWERMENU_SHOW_ICONS:-1}" -eq 1 ]; then
   power_off_btn=""
   reboot_btn=""
   lock_btn=""
   suspend_btn="鈴"
   logout_btn=""
+fi
+if [ "${ROFI_POWERMENU_SHOW_TEXT:-0}" -eq 1 ]; then
+  power_off_btn="${power_off_btn} Shut Down"
+  reboot_btn="${reboot_btn} Restart"
+  lock_btn="${lock_btn} Lock Screen"
+  suspend_btn="${suspend_btn} Suspend"
+  logout_btn="${logout_btn} Log Out"
+fi
 
 # grep -a since it assumes with our nullcodes etc that this is a binary file
 # grep -o to only leave the things we grep for
 case $(echo "$*" | grep -a -o -e "Shutdown" -e "Reboot" -e "Lockscreen" -e "Logout" -e "Suspend") in
 "Shutdown")
+  if [ -n "$ROFI_POWERMENU_SHUTDOWN_CMD" ]; then eval "$ROFI_POWERMENU_SHUTDOWN_CMD"; else
     systemctl poweroff
+  fi
   ;;
 "Reboot")
+  if [ -n "$ROFI_POWERMENU_REBOOT_CMD" ]; then eval "$ROFI_POWERMENU_REBOOT_CMD"; else
     systemctl reboot
+  fi
   ;;
 "Lockscreen")
   # Completely detach from the parent script
   # If in/outputs are not redirected, rofi will wait for the forked process as well.
+  if [ -n "$ROFI_POWERMENU_LOCKSCREEN_CMD" ]; then eval "$ROFI_POWERMENU_LOCKSCREEN_CMD"; else
     lockscreen rofi </dev/null >/dev/null 2>/dev/null &
+  fi
   ;;
 "Logout")
+  if [ -n "$ROFI_POWERMENU_LOGOUT_CMD" ]; then eval "$ROFI_POWERMENU_LOGOUT_CMD"; else
     i3-msg exit
+  fi
   ;;
 "Suspend")
+  if [ -n "$ROFI_POWERMENU_SUSPEND_CMD" ]; then eval "$ROFI_POWERMENU_SUSPEND_CMD"; else
     lockscreen rofi </dev/null >/dev/null 2>/dev/null &
     systemctl suspend
+  fi
   ;;
 esac