Move down one line when enter is pressed, use ESC to quit

chunks.py

@@ -10,13 +10,6 @@ class ChunkDiff():
 	Todo: Implement delete diff
 	"""
 	
-	@classmethod
-	def combine(cls, diff_a, diff_b):
-		diff = cls()
-		diff.apply(diff_a)
-		diff.apply(diff_b)
-		return diff
-	
 	def __init__(self):
 		self._chars = {}
 	
@@ -27,6 +20,12 @@ class ChunkDiff():
 		return diff
 		#self._chars = d.copy()
 	
+	@classmethod
+	def from_string(cls, s):
+		diff = cls()
+		#for c in string
+		pass
+	
 	def copy(self):
 		return ChunkDiff.from_dict(self.to_dict().copy())
 	
@@ -40,12 +39,14 @@ class ChunkDiff():
 		#return self._chars.copy()
 	
 	def set(self, x, y, character):
-		self._chars[x+y*CHUNK_WIDTH] = character
+		pos = x+y*CHUNK_WIDTH
+		self._chars[pos] = character
 	
 	def delete(self, x, y):
-		pos = x + y*CHUNK_WIDTH
-		if pos in self._chars:
-			del self._chars[x+y*CHUNK_WIDTH]
+		self.set(x, y, " ")
+	
+	def clear_deletions(self):
+		self._chars = {i: v for i, v in self._chars.items() if v != " "}
 	
 	def apply(self, diff):
 		for i, c in diff._chars.items():
@@ -56,6 +57,9 @@ class ChunkDiff():
 		s = "".join(d.get(i, " ") for i in range(CHUNK_WIDTH*CHUNK_HEIGHT))
 		return [s[i:i+CHUNK_WIDTH] for i in range(0, CHUNK_WIDTH*CHUNK_HEIGHT, CHUNK_WIDTH)]
 	
+	def empty(self):
+		return bool(self._chars)
+	
 
 class Chunk():
 	"""
@@ -74,13 +78,17 @@ class Chunk():
 	
 	def set(self, x, y, character):
 		self._modifications.set(x, y, character)
+		self.touch()
 	
 	def delete(self, x, y):
 		self._modifications.delete(x, y)
+		self.touch()
 	
 	def commit_changes(self):
 		self._content.apply(self._modifications)
+		self._content.clear_deletions()
 		self._modifications = ChunkDiff()
+		self.touch()
 	
 	def drop_changes(self):
 		self._modifications = ChunkDiff()
@@ -96,6 +104,12 @@ class Chunk():
 			window.addstr(y, x, line)
 			y += 1
 	
+	def modified(self):
+		return not self._modifications.empty()
+	
+	def empty(self):
+		return self._content.empty() and self._modifications.empty()
+
 class ChunkPool():
 	"""
 	Is a collection of chunks.

client.py

@@ -44,8 +44,8 @@ class Client():
 		while True:
 			i = scr.getkey()
 			
-			if   i == "q": self.stop()
-			elif i == "r": self.map_.redraw()
+			if   i == "\x1b": self.stop()
+			#elif i == "r": self.map_.redraw()
 			# normal cursor movement
 			elif i == "KEY_UP":     self.map_.move_cursor(0, -1)
 			elif i == "KEY_DOWN":   self.map_.move_cursor(0, 1)
@@ -65,6 +65,7 @@ class Client():
 			elif i in string.digits + string.ascii_letters + string.punctuation + " ":
 				self.map_.write(i)
 			elif i == "\x7f": self.map_.delete()
+			elif i == "\n":   self.map_.newline()
 			
 			else: sys.stdout.write(repr(i) + "\n")
 	

maps.py

@@ -20,6 +20,8 @@ class Map():
 		self.worldy = 0
 		self.cursorx = self.cursorpadding
 		self.cursory = self.cursorpadding
+		self.lastcurx = self.cursorx
+		self.lastcury = self.cursory
 		
 		self.chunkpool = chunkpool
 		self.drawevent = drawevent
@@ -106,7 +108,7 @@ class Map():
 			
 			chunk.set(inchunkx(self.cursorx), inchunky(self.cursory), char)
 		
-		self.move_cursor(1, 0)
+		self.move_cursor(1, 0, False)
 	
 	def delete(self):
 		with self.chunkpool as pool:
@@ -114,11 +116,18 @@ class Map():
 			if chunk:
 				chunk.delete(inchunkx(self.cursorx-1), inchunky(self.cursory))
 			
-		self.move_cursor(-1, 0)
+		self.move_cursor(-1, 0, False)
 	
-	def move_cursor(self, dx, dy):
-		self.cursorx += dx
-		self.cursory += dy
+	def newline(self):
+		self.set_cursor(self.lastcurx, self.lastcury+1)
+	
+	def set_cursor(self, x, y, explicit=True):
+		self.cursorx = x
+		self.cursory = y
+		
+		if explicit:
+			self.lastcurx = self.cursorx
+			self.lastcury = self.cursory
 		
 		self.worldx = min(
 			self.cursorx - self.cursorpadding,
@@ -138,13 +147,16 @@ class Map():
 		
 		self.load_visible()
 		
+	
+	def move_cursor(self, dx, dy, explicit=True):
+		self.set_cursor(self.cursorx+dx, self.cursory+dy, explicit)
+	
 	def scroll(self, dx, dy):
 		self.worldx += dx
 		self.worldy += dy
 		
 		# new scrolling code: The cursor stays on the same screen position while scrolling
-		self.cursorx += dx
-		self.cursory += dy
+		self.move_cursor(dx, dy)
 		
 		# old scrolling code: The cursor would stay on the same world coordinates while scrolling,
 		# and only if it was at the edge of the screen, it would get carried with the window.
@@ -164,7 +176,7 @@ class Map():
 			#)
 		#)
 		
-		self.load_visible()
+		#self.load_visible()
 	
 
 class ChunkMap():