[PATCH 3 of 3] util: add readfile() & writefile() helper functions

[Dan Villiom Podlaski Christiansen]

# HG changeset patch
# User Dan Villiom Podlaski Christiansen <danchr at gmail.com>
# Date 1304185315 -7200
# Node ID 9eda7d15fdf520c5408963fd70f356b10b01a78b
# Parent  8b489f0fbc996eb5ddf5f0b3b05c5b4b4c2f5665
util: add readfile() & writefile() helper functions

These two functions allow quickly reading or writing a file, without
relying on reference counting to close the file handle afterwards.

diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -771,6 +771,20 @@ def makedirs(name, mode=None):
     makedirs(parent, mode)
     makedirs(name, mode)
 
+def readfile(path, size=-1):
+    fp = open(path)
+    try:
+        return fp.read(size)
+    finally:
+        fp.close()
+
+def writefile(path, mode, text):
+    fp = open(path, mode)
+    try:
+        fp.write(text)
+    finally:
+        fp.close()
+
 class chunkbuffer(object):
     """Allow arbitrary sized chunks of data to be efficiently read from an
     iterator over chunks of arbitrary size."""