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#! /usr/bin/env python
# encoding: utf-8
"""
Re-calculate md5 hashes of files only when the file time have changed.
The hashes can also reflect either the file contents (STRONGEST=True) or the
file time and file size.
The performance benefits of this module are usually insignificant.
"""
import os, stat
from waflib import Utils, Build, Node
STRONGEST = True
Build.SAVED_ATTRS.append('hashes_md5_tstamp')
def h_file(self):
filename = self.abspath()
st = os.stat(filename)
cache = self.ctx.hashes_md5_tstamp
if filename in cache and cache[filename][0] == st.st_mtime:
return cache[filename][1]
if STRONGEST:
ret = Utils.h_file(filename)
else:
if stat.S_ISDIR(st[stat.ST_MODE]):
raise IOError('Not a file')
ret = Utils.md5(str((st.st_mtime, st.st_size)).encode()).digest()
cache[filename] = (st.st_mtime, ret)
return ret
h_file.__doc__ = Node.Node.h_file.__doc__
Node.Node.h_file = h_file
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