Add powerline.segments.i3wm.mode

also make powerline-bar.py redraw on mode change

powerline/bindings/bar/powerline-bar.py

@@ -30,6 +30,7 @@ def render(reschedule=False):
 		write('\n')
 		sys.stdout.flush()
 
+
 if __name__ == '__main__':
 	parser = ArgumentParser(description='Powerline BAR bindings.')
 	parser.add_argument(
@@ -47,11 +48,14 @@ if __name__ == '__main__':
 	if args.i3:
 		try:
 			import i3ipc
-			conn = i3ipc.Connection()
-			conn.on('workspace::focus', lambda conn, evt: render())
-			conn.main()
 		except ImportError:
 			import i3
 			i3.Subscription(lambda evt, data, sub: print(render()), 'workspace')
+		else:
+			conn = i3ipc.Connection()
+			conn.on('workspace::focus', lambda conn, evt: render())
+			conn.on('mode', lambda conn, evt: render())
+			conn.main()
 
-	while True: pass
+	while True:
+		time.sleep(0.5)

powerline/segments/i3wm.py

@@ -1,6 +1,11 @@
 # vim:fileencoding=utf-8:noet
 from __future__ import (unicode_literals, division, absolute_import, print_function)
 
+from threading import Thread
+
+from powerline.segments import Segment, with_docstring
+
+
 conn = None
 try:
     import i3ipc
@@ -36,3 +41,32 @@ def workspaces(pl, strip=0):
 		'contents': w['name'][min(len(w['name']),strip):],
 		'highlight_groups': calcgrp(w)
 	} for w in conn.get_workspaces()]
+
+class ModeSegment(Segment):
+	def startup(self, pl, shutdown_event):
+		self.mode = 'default'
+
+		def callback(conn, e):
+			self.mode = e.change
+
+		conn = i3ipc.Connection()
+		conn.on('mode', callback)
+		self.thread = Thread(target=conn.main)
+		self.thread.daemon = True
+		self.thread.start()
+
+	def __call__(self, pl, default=None):
+		if self.mode == 'default':
+			return default
+		return self.mode
+
+
+mode = with_docstring(ModeSegment(),
+'''Returns the current i3 mode
+
+:param str default:
+	Specifies the name to be displayed instead of "default".
+	By default the segment is left out in the default mode.
+
+Highligh groups used: ``mode``
+''')