ropty, does not work with the standard programs, but you can echo into it

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 113 insertions, 0 deletions

diff --git a/src/plugins/ropty.py b/src/plugins/ropty.py
new file mode 100644
index 0000000..09e4a23
--- /dev/null
+++ b/src/plugins/ropty.py
@@ -0,0 +1,113 @@
+# -*- python -*-
+'''
+xpybar – xmobar replacement written in python
+Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+'''
+import os
+import threading
+
+from plugins.linereader import LineReader
+
+
+class ROPTY(LineReader):
+    '''
+    Read-only PTY for viewing of wall, write and talk messages
+    
+    @variable  on_update:()→void  Called when a new line is available
+    @variable  master:int         The file descriptor of the PTY master
+    @variable  slave:int          The file descriptor of the PTY slave
+    '''
+    
+    
+    def __init__(self, on_update = None):
+        '''
+        Constructor
+        
+        @param  on_update:()→void  Called when a new line is available
+        '''
+        def noop():
+            pass
+        self.on_update = noop if on_update is None else on_update
+        (self.master, self.slave) = os.openpty()
+        self.__reader = LineReader(self.master)
+        self.__condition = threading.Condition()
+        self.__queue = []
+        def background():
+            try:
+                while True:
+                    got = self.__reader.next()
+                    if got is None:
+                        return
+                    self.__condition.acquire()
+                    try:
+                        self.__queue.append(got)
+                    finally:
+                        self.__condition.release()
+                    self.on_update()
+            except:
+                return
+        self.__thread = threading.Thread(target = background)
+        self.__thread.setDaemon(True)
+        self.__thread.start()
+    
+    
+    def close(self):
+        '''
+        Close the PTY
+        '''
+        os.close(self.slave)
+        os.close(self.master)
+    
+    
+    def size(self):
+        '''
+        Return the number of available lines
+        
+        @return  :int  The number of available lines
+        '''
+        self.__condition.acquire()
+        try:
+            return len(self.__queue)
+        finally:
+            self.__condition.release()
+    
+    
+    def __len__(self):
+        '''
+        Return the number of available lines
+        
+        @return  :int  The number of available lines
+        '''
+        return self.size()
+    
+    
+    def next(self):
+        '''
+        Return and unqueue the next available line
+        
+        @return  :str  The next available line, `None` if there
+                       are no more lines currently available
+        '''
+        self.__condition.acquire()
+        try:
+            if len(self.__queue) == 0:
+                return None
+            rc = self.__queue[0]
+            self.__queue[:] = self.__queue[1:]
+        finally:
+            self.__condition.release()
+        return rc
+