# HG changeset patch
# User Gregory Szorc <gregory.szorc@gmail.com>
# Date 1444087692 25200
# Node ID a3f7e5461dbd7cfd7cbbe960aa23a622afe2afae
# Parent  d69245af4dbe83f546b46575c83a3efb840615aa
util.chunkbuffer: special case reading everything

The new code results in simpler logic within the while loop. It is also
faster since we avoid performing operations on the queue and buf
collections. However, there shouldn't be any super hot loops for this
since the whole point of chunkbuffer is to avoid reading large amounts
of data at once. This does, however, make it easier to optimize
chunkbuffer in a subsequent patch.

diff -r d69245af4dbe -r a3f7e5461dbd mercurial/util.py
--- a/mercurial/util.py	Mon Oct 05 07:13:35 2015 +0200
+++ b/mercurial/util.py	Mon Oct 05 16:28:12 2015 -0700
@@ -1292,10 +1292,13 @@
         Returns less than L bytes if the iterator runs dry.
 
         If size parameter is omitted, read everything"""
+        if l is None:
+            return ''.join(self.iter)
+
         left = l
         buf = []
         queue = self._queue
-        while left is None or left > 0:
+        while left > 0:
             # refill the queue
             if not queue:
                 target = 2**18
@@ -1308,9 +1311,8 @@
                     break
 
             chunk = queue.popleft()
-            if left is not None:
-                left -= len(chunk)
-            if left is not None and left < 0:
+            left -= len(chunk)
+            if left < 0:
                 queue.appendleft(chunk[left:])
                 buf.append(chunk[:left])
             else: