make python package and build up class model

src/fenrir-package/screen/linux.py

@@ -0,0 +1,58 @@
+#!/bin/python
+
+import difflib
+import textwrap
+import time
+
+#import fenrir.utils.debug
+class screenManager():
+    def __init__(self, device='/dev/vcsa'):
+        self.vcsaDevice = device
+
+    def analyzeScreen(self, runtime):
+        # read screen
+        currTTY = open('/sys/devices/virtual/tty/tty0/active','r')
+        runtime['newTTY'] = currTTY.read()[3:-1]
+        currTTY.close() 
+        
+        try:
+            vcsa = open(self.vcsaDevice + runtime['newTTY'] ,'rb',0)
+            runtime['newContentBytes'] = vcsa.read()
+            vcsa.close()
+        except:
+            return runtime
+
+        # get metadata like cursor or screensize
+        runtime['lines'] = int( runtime['newContentBytes'][0])
+        runtime['columns'] = int( runtime['newContentBytes'][1])
+        runtime['newCursor']['x'] = int( runtime['newContentBytes'][2])
+        runtime['newCursor']['y'] = int( runtime['newContentBytes'][3])
+
+        # analyze content
+        runtime['newContentText'] = str(runtime['newContentBytes'][4:][::2].decode('cp1252').encode('utf-8'))[2:]
+        runtime['newContentAttrib'] = runtime['newContentBytes'][5:][::2]
+        runtime['newContentText'] = '\n'.join(textwrap.wrap(runtime['newContentText'], runtime['columns']))[:-2]
+        
+        if runtime['newTTY'] != runtime['oldTTY']:
+            runtime['oldContentBytes'] = b''
+            runtime['oldContentAttrib'] = b''
+            runtime['oldContentText'] = ''
+            runtime['oldCursor']['x'] = 0
+            runtime['oldCursor']['y'] = 0
+
+        # changes on the screen
+        if runtime['oldContentBytes'] != runtime['newContentBytes']:
+            if ((len(runtime['delta']) < 4) or runtime['oldTTY'] != runtime['newTTY']):
+                runtime['speechDriver'].cancel()
+            diff = difflib.ndiff(runtime['oldContentText'], runtime['newContentText'])
+            runtime['delta'] = ''.join(x[2:] for x in diff if x.startswith('+ '))
+            runtime['speechDriver'].speak(runtime['delta'])
+
+            # set new "old" values
+            runtime['oldContentBytes'] = runtime['newContentBytes']
+            runtime['oldContentText'] = runtime['newContentText']
+            runtime['oldContentTextAttrib'] = runtime['newContentAttrib']
+            runtime['oldCursor']['x'] = runtime['newCursor']['x']
+            runtime['oldCursor']['y'] = runtime['newCursor']['y']
+            runtime['oldTTY'] = runtime['newTTY']
+        return runtime