From 753774c5e91d35ad6f1b20d6a0c5fa33a054c5eb Mon Sep 17 00:00:00 2001
From: "Martin A. Brown" <martin@linux-ip.net>
Date: Fri, 1 Apr 2016 22:19:25 -0700
Subject: [PATCH] compute and generate an MD5SUMS file for each source document

---
 tldp/doctypes/common.py | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/tldp/doctypes/common.py b/tldp/doctypes/common.py
index 73d46e2..bb6fbb1 100644
--- a/tldp/doctypes/common.py
+++ b/tldp/doctypes/common.py
@@ -7,6 +7,7 @@ from __future__ import unicode_literals
 import os
 import sys
 import stat
+import time
 import errno
 import codecs
 import shutil
@@ -140,11 +141,39 @@ class BaseDoctype(object):
             s = '''
 # - - - - - {source.stem} - - - - - -
 
-            cd -- "{output.dirname}"'''
+cd -- "{output.dirname}"'''
             return self.shellscript(s, **kwargs)
         os.chdir(self.output.dirname)
         return True
 
+    def generate_md5sums(self, **kwargs):
+        logger.debug("%s generating MD5SUMS in %s.",
+                     self.output.stem, self.output.dirname)
+        md5file = os.path.join(self.output.dirname, 'MD5SUMS')
+        fileset = sorted(self.source.md5sums.items())
+        if self.config.script:
+            l = list()
+            for fname, hashval in fileset:
+                l.append('# {}  {}'.format(hashval, fname))
+            md5s = '\n'.join(l)
+            s = '''# -- calculating MD5SUMS file
+#
+# md5sum > {} -- {}
+#
+# -- These are the values for sources at timestamp {}
+#
+{}
+#'''
+            s = s.format(md5file,
+                         ' '.join(self.source.statinfo.keys()),
+                         time.strftime('%F-%T', time.gmtime()),
+                         md5s)
+            return self.shellscript(s, **kwargs)
+        with codecs.open(md5file, 'w', encoding='utf-8') as f:
+            for fname, hashval in fileset:
+                print(hashval + '  ' + fname, file=f)
+        return True
+
     def copy_static_resources(self, **kwargs):
         logger.debug("%s copy resources %s.",
                      self.output.stem, self.output.dirname)
@@ -233,6 +262,7 @@ class BaseDoctype(object):
                  'clear_output',
                  'mkdir_output',
                  'chdir_output',
+                 'generate_md5sums',
                  'copy_static_resources',
                  ]