Update README.md for new --module option

README.md

@@ -1,30 +1,41 @@
-# blank_detector
+# Blank Detector Task Controller
 
-A tool to detect blank screen by DPMS and run commands only when the screen is blank.
+A tool for running commands only when the display is blank or locked.
 
 ## Requirement
 
 - Linux
-- DPMS enabled X environment (Please check by 'xset q|grep DPMS')
 - Python 2.7 or 3.x
+- One of these for display status detector
+    - DPMS enabled X environment (Please check by 'xset q|grep DPMS')
+    - 'xscreensaver-command' for xscreensaver status
 
 ## Usage
 
 ```
 $ ./blank_detector.py -h
-usage: blank_detector.py [-h] -d DISPLAY -c COMMAND [-l LOG]
+usage: blank_detector.py [-h] [-d DISPLAY] -c COMMAND
+                         [-m {DpmsDetector,XscreensaverDetector}] [-l LOG]
 
 optional arguments:
   -h, --help            show this help message and exit
   -d DISPLAY, --display DISPLAY
-                        Specify display name in format ':0.0'
+                        For detecting display blank, specify target display
+                        name in format ':0.0' (default is taken from $DISPLAY)
   -c COMMAND, --command COMMAND
                         Set a command to execute
+  -m {DpmsDetector,XscreensaverDetector}, --module {DpmsDetector,XscreensaverDetector}
+                        Select detector module for display status (default:
+                        DpmsDetector)
   -l LOG, --log LOG     Set log file path for logging
 ```
 
 ## Example
 
 ```
-$ ./blank_detector.py -d ':0.0' -c 'command.sh arg1 arg2' -l /path/to/app.log
+$ ./blank_detector.py -d ':0.0' -c 'command.sh arg1 arg2' -m DpmsDetector -l /path/to/app.log
+```
+
+```
+$ ./blank_detector.py -d ':0.0' -c 'command.sh arg1 arg2' -m XscreensaverDetector -l /path/to/app.log
 ```