diff --git a/bindings/codemp_client.cpython-38-darwin.so.REMOVED.git-id b/bindings/codemp_client.cpython-38-darwin.so.REMOVED.git-id
index d43fe94..59ed00c 100644
--- a/bindings/codemp_client.cpython-38-darwin.so.REMOVED.git-id
+++ b/bindings/codemp_client.cpython-38-darwin.so.REMOVED.git-id
@@ -1 +1 @@
-8114809f135d7ea9f88d0a45a9de8fc93fdbd9ff
\ No newline at end of file
+a4493ce329ed791cd4bd17b102efdde3ca4acd8f
\ No newline at end of file
diff --git a/plugin.py b/plugin.py
index b6c6561..8683dab 100644
--- a/plugin.py
+++ b/plugin.py
@@ -14,6 +14,21 @@ _cursor_controller = None
 _buffer_controller = None
 _setting_key = "codemp_buffer"
 
+_regions_colors = [
+	"region.redish",
+	"region.orangeish",
+	"region.yellowish",
+	"region.greenish",
+	"region.cyanish",
+	"region.bluish",
+	"region.purplish",
+	"region.pinkish"
+]
+
+def status_log(msg):
+	sublime.status_message("[codemp] {}".format(msg))
+	print("[codemp] {}".format(msg))
+
 def store_task(name = None):
 	def store_named_task(task):
 		global _tasks
@@ -22,154 +37,6 @@ def store_task(name = None):
 
 	return store_named_task
 
-def plugin_loaded():
-	global _client
-	_client = CodempClient()
-	sublime_asyncio.acquire() # instantiate and start a global event loop.
-
-class CodempClientViewEventListener(sublime_plugin.ViewEventListener):
-	@classmethod
-	def is_applicable(cls, settings):
-		return "codemp_buffer" in settings
-
-	def on_selection_modified_async(self):
-		global _cursor_controller
-		if _cursor_controller:
-			sublime_asyncio.dispatch(send_selection(self.view))
-
-	def on_close(self):
-		self.view.settings()["codemp_buffer"] = False
-
-class CodempClientTextChangeListener(sublime_plugin.TextChangeListener):
-	@classmethod
-	def is_applicable(cls, buffer):
-		for view in buffer.views():
-			if "codemp_buffer" in view.settings():
-				return True
-		return False
-
-	def on_text_changed(self, changes):
-		global _buffer_controller
-		if _buffer_controller:
-			for change in changes:
-				sublime_asyncio.dispatch(apply_changes(change))
-
-async def apply_changes(change):
-	global _buffer_controller
-
-	text = change.str
-	skip = change.a.pt
-	if change.len_utf8 == 0: # we are inserting new text.
-		tail = len(_buffer_controller.get_content()) - skip
-	else: # we are changing an existing region of text of length len_utf8
-		tail = len(_buffer_controller.get_content()) - skip - change.len_utf8
-
-	tail_skip = len(_buffer_controller.get_content()) - tail
-	print("[buff change]", skip, text, tail_skip)
-	await _buffer_controller.apply(skip, text, tail)
-
-async def make_connection(server_host):
-	global _client
-
-	if _client.ready:
-		sublime.message_dialog("A connection already exists.")
-		return
-
-	sublime.status_message("[codemp] Connecting to {}".format(server_host))
-	print("[codemp] Connecting to {}".format(server_host))
-	await _client.connect(server_host)
-
-	id = await _client.get_id()
-	sublime.status_message("[codemp] Connected with client ID: {}".format(id))
-	print("[codemp] Connected with client ID: ", id)
-
-async def move_cursor(usr, caller, path, start, end):
-	print(usr, caller, start, end)
-
-async def sync_buffer(caller, start, end, txt):
-	print("[buffer]", caller, start, end, txt)
-
-async def share_buffer(buffer):
-	global _client
-	global _cursor_controller
-	global _buffer_controller
-
-	if not _client.ready:
-		sublime.error_message("No connected client.")
-		return
-
-	sublime.status_message("[codemp] Sharing buffer {}".format(buffer))
-	print("[codemp] Sharing buffer {}".format(buffer))
-
-	view = get_matching_view(buffer)
-	contents = get_contents(view)
-	created = await _client.create(view.file_name(), contents)
-	if not created:
-		sublime.error_message("Could not share buffer.")
-		return
-
-	_buffer_controller = await _client.attach(buffer)
-	_buffer_controller.callback(sync_buffer, _client.id)
-	
-	_cursor_controller = await _client.listen()
-	_cursor_controller.callback(move_cursor, _client.id)
-
-	if not _cursor_controller:
-		sublime.error_message("Could not subsribe a listener.")
-		return
-	if not _buffer_controller:
-		sublime.error_message("Could not attach to the buffer.")
-		return
-
-	sublime.status_message("[codemp] Listening")
-	print("[codemp] Listening")
-
-	view.settings()["codemp_buffer"] = True
-
-async def join_buffer(window, buffer):
-	global _client
-	global _cursor_controller
-	global _buffer_controller
-
-	if not _client.ready:
-		sublime.error_message("No connected client.")
-		return
-
-	view = get_matching_view(buffer)
-
-	sublime.status_message("[codemp] Joining buffer {}".format(buffer))
-	print("[codemp] Joining buffer {}".format(buffer))
-
-	_buffer_controller = await _client.attach(buffer)
-	content = _buffer_controller.get_content()
-	view.run_command("codemp_replace_view", {"content": content})
-
-	_cursor_controller = await _client.listen()
-	_cursor_controller.callback(move_cursor)
-	
-
-	if not _cursor_controller:
-		sublime.error_message("Could not subsribe a listener.")
-		return
-	if not _buffer_controller:
-		sublime.error_message("Could not attach to the buffer.")
-		return
-
-	sublime.status_message("[codemp] Listening")
-	print("[codemp] Listening")
-
-	view.settings()["codemp_buffer"] = True
-
-async def send_selection(view):
-	global _cursor_controller
-
-	path = view.file_name()
-	region = view.sel()[0] # TODO: only the last placed cursor/selection.
-	start = view.rowcol(region.begin()) #only counts UTF8 chars
-	end = view.rowcol(region.end())
-	
-	await _cursor_controller.send(path, start, end)
-
 def get_contents(view):
 	r = sublime.Region(0, view.size())
 	return view.substr(r)
@@ -180,25 +47,225 @@ def get_matching_view(path):
 			if view.file_name() == path:
 				return view
 
+def rowcol_to_region(view, start, end):
+	a = view.text_point(start[0], start[1])
+	b = view.text_point(end[0], end[1])
+	return sublime.Region(a, b)
+
+def plugin_loaded():
+	global _client
+	_client = CodempClient() # create an empty instance of the codemp client.
+	sublime_asyncio.acquire() # instantiate and start a global asyncio event loop.
+
+def plugin_unloaded():
+	for window in sublime.windows():
+		for view in window.views():
+			if "codemp_buffer" in view.settings():
+				del view.settings()["codemp_buffer"]
+	# disconnect all buffers
+	# stop all callbacks
+	# disconnect the client.
+	print("unloading")
+
+async def connect_command(server_host, session="default"):
+	global _client
+	status_log("Connecting to {}".format(server_host))
+	await _client.connect(server_host)
+	await join_workspace(session)
+
+async def join_workspace(session):
+	global _client
+	global _cursor_controller
+
+	status_log("Joining workspace: {}".format(session))
+	_cursor_controller = await _client.join(session)
+	_cursor_controller.callback(move_cursor)
+
+async def share_buffer_command(buffer):
+	global _client
+	global _cursor_controller
+	global _buffer_controller
+
+	status_log("Sharing buffer {}".format(buffer))
+
+	view = get_matching_view(buffer)
+	contents = get_contents(view)
+
+	try:
+		await _client.create(buffer, contents)
+
+		_buffer_controller = await _client.attach(buffer)
+		_buffer_controller.callback(apply_buffer_change)
+	except Exception as e:
+		sublime.error_message("Could not share buffer: {}".format(e))
+		return
+
+	status_log("Listening")
+	view.set_status("z_codemp_buffer", "[Codemp]")
+	view.settings()["codemp_buffer"] = True
+
+def move_cursor(cursor_event):
+	global _regions_colors
+
+	# TODO: make the matching user/color more solid. now all users have one color cursor.
+	# Maybe make all cursors the same color and only use annotations as a discriminant.
+	view = get_matching_view(cursor_event.buffer)
+	if "codemp_buffer" in view.settings():
+		reg = rowcol_to_region(view, cursor_event.start, cursor_event.end)
+		reg_flags = sublime.RegionFlags.DRAW_EMPTY | sublime.RegionFlags.DRAW_NO_FILL
+
+		view.add_regions("codemp_cursors", [reg], flags = reg_flags, scope=_regions_colors[2], annotations = [cursor_event.user])
+
+def send_cursor(view):
+	global _cursor_controller
+
+	path = view.file_name()
+	region = view.sel()[0] # TODO: only the last placed cursor/selection.
+	start = view.rowcol(region.begin()) #only counts UTF8 chars
+	end = view.rowcol(region.end())
+	
+	_cursor_controller.send(path, start, end)
+
+def send_buffer_change(buffer, changes):
+	global _buffer_controller
+
+	view = buffer.primary_view()
+	start, txt, end = compress_changes(view, changes)
+
+	contlen = len(_buffer_controller.get_content())
+	_buffer_controller.delta(start, txt, min(end, contlen))
+	time.sleep(0.1)
+	print("server buffer: -------")
+	print(_buffer_controller.get_content())
+
+def compress_changes(view, changes):
+	## TODO: doesn't work correctly.
+
+	# Sublime text on_text_changed events, gives a list of changes.
+	# in case of simple insertion or deletion this is fine.
+	# but if we swap a string (select it and add another string in it's place) or have multiple selections
+	# we receive two split text changes, first we add the new string in front of the selection
+	# and then we delete the old selection. e.g: [1234] -> hello is split into: [1234] -> hello[1234] -> hello[]
+	# this fucks over the operations factory algorithm, which panics if reading the operations sequentially,
+	# since the changes refer to the same point in time and are not updated each time.
+
+	# as a workaround, we compress all changes into a big change, which gives the region in which the change occurred
+	# and the new string, extracted directly from the local buffer already modified.
+	if len(changes) == 1:
+		return (changes[0].a.pt, changes[0].str, changes[0].b.pt)
+
+	return walk_compress_changes(view, changes)
+
+def walk_compress_changes(view, changes):
+	# the bounding region of all text changes.
+	txt_a = float("inf")
+	txt_b = 0
+
+	# the region in the original buffer subjected to the change.
+	reg_a = float("inf")
+	reg_b = 0
+
+	# we keep track of how much the changes move the indexing of the buffer
+	buffer_shift = 0 # left - + right
+
+	for change in changes:
+		# the change in characters that the change would bring
+		# len(str) and .len_utf8 are mutually exclusive
+		# len(str) is when we insert new text at a position
+		# .len_utf8 is the length of the deleted/canceled string in the buffer
+		change_delta = len(change.str) - change.len_utf8
+
+		txt_a = min(txt_a, change.a.pt) # the text region is enlarged to the left
+		# On insertion, change.b.pt == change.a.pt
+		# If we meet a new insertion further than the current window
+		# we expand to the right by that change.
+		# On deletion, change.a.pt == change.b.pt - change.len_utf8
+		# when we delete a selection and it is further than the current window
+		# we enlarge to the right up until the begin of the deleted region.
+		if change.b.pt > txt_b:
+			txt_b = change.b.pt + change_delta
+		else:
+			# otherwise we just shift the window according to the change
+			txt_b += change_delta
+		
+		reg_a = min(reg_a, change.a.pt) # text region enlarged to the left
+		# In this bit, we want to look at the buffer BEFORE the modifications
+		# but we are working on the buffer modified by all previous changes for each loop
+		# we use buffer_shift to keep track of how the buffer shifts around
+		# to map back to the correct index for each change in the unmodified buffer.
+		if change.b.pt + buffer_shift > reg_b:
+			# we only enlarge if we have changes that exceede on the right the current window
+			reg_b = change.b.pt + buffer_shift
+
+		# after using the change delta, we archive it for the next iterations
+		buffer_shift -= change_delta
+
+		# print("\t[buff change]", change.a.pt, change.str, "(", change.len_utf8,")", change.b.pt)
+		# print("[walking txt]", "[", txt_a, txt_b, "]")
+		# print("[walking reg]", "[", reg_a, reg_b, "]")
+
+	txt = view.substr(sublime.Region(txt_a, txt_b))
+	return reg_a, txt, reg_b
+
+def apply_buffer_change(text_change):
+	print("test")
+	print(text_change)
+	print(text_change.start_incl, text_change.end_excl, text_change.content)
+
+
+# Sublime interface
+##############################################################################
+
+class CodempClientViewEventListener(sublime_plugin.ViewEventListener):
+	@classmethod
+	def is_applicable(cls, settings):
+		return "codemp_buffer" in settings
+
+	@classmethod
+	def applies_to_primary_view_only(cls):
+		return True
+
+	def on_selection_modified_async(self):
+		global _cursor_controller
+		if _cursor_controller:
+			send_cursor(self.view)
+
+	def on_close(self):
+		del self.view.settings()["codemp_buffer"]
+
+	def on_activated_async(self):
+		#gain input focus
+		pass
+
+	def on_deactivated_async(self):
+		pass
+
+class CodempClientTextChangeListener(sublime_plugin.TextChangeListener):
+	@classmethod
+	def is_applicable(cls, buffer):
+		if "codemp_buffer" in buffer.primary_view().settings():
+			return True
+		return False
+
+	def on_text_changed_async(self, changes):
+		global _buffer_controller
+		if _buffer_controller:
+			send_buffer_change(self.buffer, changes)
 
 # See the proxy command class at the bottom
 class CodempConnectCommand(sublime_plugin.WindowCommand):
 	def run(self, server_host):
-		sublime_asyncio.dispatch(make_connection(server_host))
+		sublime_asyncio.dispatch(connect_command(server_host))
 
 # see proxy command at the bottom
 class CodempShareCommand(sublime_plugin.WindowCommand):
 	def run(self, buffer):
-		sublime_asyncio.dispatch(share_buffer(buffer))
+		sublime_asyncio.dispatch(share_buffer_command(buffer))
 
 # see proxy command at the bottom
-class CodempJoinCommand(sublime_plugin.WindowCommand):
-	def run(self, buffer):
-		sublime_asyncio.dispatch(join_buffer(self.window, buffer))
-
-class CodempPopulateView(sublime_plugin.TextCommand):
-	def run(self, edit, content):
-		self.view.replace(edit, sublime.Region(0, self.view.size()), content)
+# class CodempJoinCommand(sublime_plugin.WindowCommand):
+# 	def run(self, buffer):
+# 		sublime_asyncio.dispatch(join_buffer(self.window, buffer))
 
 class ProxyCodempConnectCommand(sublime_plugin.WindowCommand):
 	# on_window_command, does not trigger when called from the command palette
@@ -227,18 +294,18 @@ class ProxyCodempShareCommand(sublime_plugin.WindowCommand):
 		return 'Share Buffer:'
 
 
-class ProxyCodempJoinCommand(sublime_plugin.WindowCommand):
-	# on_window_command, does not trigger when called from the command palette
-	# See: https://github.com/sublimehq/sublime_text/issues/2234 
-	def run(self, **kwargs):
-		self.window.run_command("codemp_join", kwargs)
+# class ProxyCodempJoinCommand(sublime_plugin.WindowCommand):
+# 	# on_window_command, does not trigger when called from the command palette
+# 	# See: https://github.com/sublimehq/sublime_text/issues/2234 
+# 	def run(self, **kwargs):
+# 		self.window.run_command("codemp_join", kwargs)
 
-	def input(self, args):
-		if 'buffer' not in args:
-			return BufferInputHandler()
+# 	def input(self, args):
+# 		if 'buffer' not in args:
+# 			return BufferInputHandler()
 
-	def input_description(self):
-		return 'Join Buffer:'
+# 	def input_description(self):
+# 		return 'Join Buffer:'
 
 class BufferInputHandler(sublime_plugin.ListInputHandler):
 	def list_items(self):
@@ -253,4 +320,4 @@ class BufferInputHandler(sublime_plugin.ListInputHandler):
 
 class ServerHostInputHandler(sublime_plugin.TextInputHandler):
 	def initial_text(self):
-		return "http://[::1]:50051"
\ No newline at end of file
+		return "http://127.0.0.1:50051"
\ No newline at end of file
diff --git a/src/codemp_client.py b/src/codemp_client.py
index cb8c6ba..a90312f 100644
--- a/src/codemp_client.py
+++ b/src/codemp_client.py
@@ -5,42 +5,37 @@ class CodempClient():
 
 	def __init__(self):
 		self.handle = libcodemp.codemp_init()
-		self.ready = False
 
 	async def connect(self, server_host): # -> None
 		await self.handle.connect(server_host)
-		self.ready = True
 
 	def disconnect(self): # -> None
 		# disconnect all buffers
 		# stop all callbacks
 		self.handle = None
-		self.ready = False
 
 	async def create(self, path, content=None): # -> None
-		if self.ready:
-			return await self.handle.create(path, content)
-		
+			await self.handle.create(path, content)
+	
+	# join a workspace
 	async def join(self, session): # -> CursorController
-		if self.ready:
 			return CursorController(await self.handle.join(session))
 		
 	async def attach(self, path): # -> BufferController
-		if self.ready:
 			return BufferController(await self.handle.attach(path))
 		
 	async def get_cursor(self): # -> CursorController
-		if self.ready:
 			return CursorController(await self.handle.get_cursor())
 
 	async def get_buffer(self, path): # -> BufferController
-		if self.ready:
 			return BufferController(await self.handle.get_buffer())
 
 	async def remove_buffer(self, path): # -> None
-		if self.ready:
 			await self.handle.disconnect_buffer(path)
 
+	async def leave_workspace(self): # -> None
+		pass # todo 
+
 class CursorController():
 	def __init__(self, handle):
 		self.handle = handle
@@ -62,7 +57,7 @@ class CursorController():
 		self.handle.drop_callback()
 
 	def callback(self, coro): # -> None
-		self.handle.callback(coro, id)
+		self.handle.callback(coro)
 
 class BufferController():
 	def __init__(self, handle):
diff --git a/src/lib.rs b/src/lib.rs
index c061156..ebb4edd 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,6 @@
 use std::{sync::Arc, format};
 
-use codemp::{prelude::*};
+use codemp::prelude::*;
 use codemp::errors::Error as CodempError;
 
 use pyo3::{
@@ -58,7 +58,9 @@ impl PyClientHandle {
         let rc = self.0.clone();
 
         pyo3_asyncio::tokio::future_into_py(py, async move {
-            rc.connect(addr.as_str()).await.map_err(PyCodempError::from)?;
+            rc.connect(addr.as_str())
+                .await
+                .map_err(PyCodempError::from)?;
             Ok(())
         })
     }
@@ -89,6 +91,7 @@ impl PyClientHandle {
         })
     }
 
+    // join a workspace
     fn join<'a>(&'a self, py: Python<'a>, session: String) -> PyResult<&'a PyAny> {
         let rc = self.0.clone();
 
@@ -393,12 +396,11 @@ impl PyBufferController {
         Ok(cont)
     }
 
-    // What to do with this send? does it make sense to implement it at all?
+    // TODO: What to do with this send? 
+    // does it make sense to implement it at all for the python side??
+
     // fn send<'a>(&self, py: Python<'a>, skip: usize, text: String, tail: usize) -> PyResult<&'a PyAny>{
-    //     let rc = self.handle.clone();
-    //     pyo3_asyncio::tokio::future_into_py(py, async move {
-    //         Ok(())
-    //     })
+    //     todo!()
     // }
 
     fn try_recv(&self, py: Python<'_>) -> PyResult<PyObject> {
@@ -440,9 +442,16 @@ impl PyBufferController {
 
 #[pyclass]
 struct PyCursorEvent {
+    #[pyo3(get, set)]
     user: String,
+    
+    #[pyo3(get, set)]
     buffer: String,
+    
+    #[pyo3(get, set)]
     start: (i32, i32),
+
+    #[pyo3(get, set)]
     end: (i32, i32)
 }
 
@@ -461,8 +470,13 @@ impl From<CodempCursorEvent> for PyCursorEvent {
 
 #[pyclass]
 struct PyTextChange {
+    #[pyo3(get, set)]
     start_incl: usize,
+    
+    #[pyo3(get, set)]
     end_excl: usize,
+
+    #[pyo3(get, set)]
     content: String
 }