Add ability to write on map

Todo:
 - make ChunkDiffs contain deletions
 - inserting a " " counts as deletion on chunk level
 - allow for more unicode characters! ^^ (only harmless ones though - no newline or control characters etc.)

chunks.py

@@ -1,12 +1,59 @@
 import threading
+import time
+from utils import CHUNK_WIDTH, CHUNK_HEIGHT
 
 class ChunkDiff():
 	"""
 	Represents differences between two chunks (changes to be made to a chunk).
 	Can be used to transform a chunk into another chunk.
+	
+	Todo: Implement delete diff
 	"""
 	
-	pass
+	@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 = {}
+	
+	@classmethod
+	def from_dict(cls, d):
+		diff = cls()
+		diff._chars = d
+		return diff
+		#self._chars = d.copy()
+	
+	def copy(self):
+		return ChunkDiff.from_dict(self.to_dict().copy())
+	
+	def combine(self, diff):
+		newdiff = self.copy()
+		newdiff.apply(diff)
+		return newdiff
+	
+	def to_dict(self):
+		return self._chars
+		#return self._chars.copy()
+	
+	def set(self, x, y, character):
+		self._chars[x+y*CHUNK_WIDTH] = character
+	
+	def delete(self, x, y):
+		del self._chars[x+y*CHUNK_WIDTH]
+	
+	def apply(self, diff):
+		for i, c in diff._chars.items():
+			self._chars[i] = c
+	
+	def lines(self):
+		d = self._chars
+		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)]
+	
 
 class Chunk():
 	"""
@@ -17,7 +64,35 @@ class Chunk():
 	 - from accumulated changes
 	"""
 	
-	pass
+	def __init__(self):
+		self._content = ChunkDiff()
+		self._modifications = ChunkDiff()
+		
+		self.touch()
+	
+	def set(self, x, y, character):
+		self._modifications.set(x, y, character)
+	
+	def delete(self, x, y):
+		self._modifications.delete(x, y)
+	
+	def commit_changes(self):
+		self._content.apply(self._modifications)
+		self._modifications = ChunkDiff()
+	
+	def drop_changes(self):
+		self._modifications = ChunkDiff()
+	
+	def get_changes(self):
+		return self._modifications
+	
+	def touch(self):
+		self.last_modified = time.time()
+	
+	def draw_to(self, x, y, window):
+		for line in self._content.combine(self._modifications).lines():
+			window.addstr(y, x, line)
+			y += 1
 
 class ChunkPool():
 	"""
@@ -27,6 +102,7 @@ class ChunkPool():
 	"""
 	
 	def __init__(self):
+		self._chunks = {}
 		self._lock = threading.RLock()
 	
 	def __enter__(self):
@@ -36,8 +112,17 @@ class ChunkPool():
 	def __exit__(self, type, value, tb):
 		self._lock.release()
 	
-	def load_list(self, coords):
+	def create(self, pos):
-		pass
+		self._chunks[pos] = Chunk()
+		return self._chunks[pos]
 	
-	def get(self, x, y):
+	def load(self, pos):
-		pass
+		if not pos in self._chunks:
+			self.create(pos)
+	
+	def load_list(self, coords):
+		for pos in coords:
+			self.load(pos)
+	
+	def get(self, pos):
+		return self._chunks.get(pos)

client.py

@@ -1,4 +1,5 @@
 import curses
+import string
 import sys
 import threading
 from maps import Map
@@ -60,6 +61,9 @@ class Client():
 			elif i == "kDN5":  self.map_.scroll(0, 10)
 			elif i == "kLFT5": self.map_.scroll(-20, 0)
 			elif i == "kRIT5": self.map_.scroll(20, 0)
+			# edit world
+			elif i in string.digits + string.ascii_letters + string.punctuation + " ":
+				self.map_.write(i)
 			
 			else: sys.stdout.write(repr(i) + "\n")
 	

maps.py

@@ -43,7 +43,7 @@ class Map():
 		with self.chunkpool as pool:
 			for x in range(chunkx(self.width) + 2):      # +2, not +1, or there will be empty gaps
 				for y in range(chunky(self.height) + 2): # in the bottom and right borders
-					chunk = pool.get(x+chunkx(self.worldx), y+chunky(self.worldy))
+					chunk = pool.get(Position(x+chunkx(self.worldx), y+chunky(self.worldy)))
 					if chunk:
 						chunk.draw_to(x*CHUNK_WIDTH, y*CHUNK_HEIGHT, self._pad)
 					else:
@@ -97,14 +97,22 @@ class Map():
 	
 	def write(self, char):
 		with self.chunkpool as pool:
-			chunk = pool.get(chunkx(self.cursorx), chunky(self.cursory))
+			chunk = pool.get(Position(chunkx(self.cursorx), chunky(self.cursory)))
 			if not chunk:
-				chunk = pool.create(chunkx(self.cursorx), chunky(self.cursory))
+				chunk = pool.create(Position(chunkx(self.cursorx), chunky(self.cursory)))
 			
-			chunk.setch(inchunkx(self.cursorx), inchunky(self.cursory), char)
+			chunk.set(inchunkx(self.cursorx), inchunky(self.cursory), char)
 		
 		self.move_cursor(1, 0)
 	
+	def delete(self):
+		with self.chunkpool as pool:
+			chunk = pool.get(Position(chunkx(self.cursorx-1), chunky(self.cursory)))
+			if chunk:
+				chunk.delete(inchunkx(self.cursorx-1), inchunky(self.cursory), char)
+			
+		self.move_cursor(-1, 0)
+	
 	def move_cursor(self, dx, dy):
 		self.cursorx += dx
 		self.cursory += dy