lemonbar: Some progress with screen

.i3/lemonbar/i3_lemonbar_launcher.py

@@ -110,7 +110,7 @@ def clean_up():
     nice_delete(config.fifo_file_executor)
     nice_term(p_conky_slow)
     nice_term(p_conky_fast)
-    nice_term(common.p_screen)
+    common.stuff_screen('kill')
     if i3_ws_obj is not None:
         i3_ws_obj.quit()
     sys.exit(0)
@@ -192,20 +192,26 @@ def strip_ansi_unicode(s):
     return strip_unicode
 
 def user_screen():
-    # Attach to screen session, creating if needed, in UTF-8 mode
-    common.p_screen = subprocess.Popen(common.screen_args # TODO lemonbar_user
-                ,stdin=subprocess.PIPE, stdout=subprocess.PIPE, text=True)
-    for line in common.p_screen.stdout:
-    #try:
-        common.logger.debug('Screen read line {}'.format(line.strip('\n')))
+    # Create screen session, in UTF-8 mode, logging to fifo
+    create_new_fifo(config.fifo_screen_log)
+    subprocess.Popen(common.screen_args) # TODO lemonbar_user
+    with open(config.fifo_screen_log, 'r', buffering=1) as screen_read:
+        while True:
+            try:
+                line = screen_read.readline()
+                if not line:
+                    break
+                common.logger.debug('Screen read line {}'.format(line.strip('\n')))
     #    with open(config.fifo_file_status, 'w') as fifo:
     #        clean_line = strip_ansi_unicode(line)
     #        if (not clean_line.startswith('[bluetooth]')
     #                and not clean_line.startswith('[CHG]')
     #                and not clean_line.isspace()):
     #            fifo.write('RESP [bluetoothctl] ' + clean_line)
-    #except:
-    #    raise
+            except:
+                raise
+
+    nice_delete(config.fifo_screen_log)
 
 class i3_thread:
     """ Helper class to start and stop threads"""