add rfc822_date_to_git()

this function converts a date in RFC822 format to a string
'seconds_since_epoch tz' that can be used for eg. GIT_AUTHOR_DATE.

1 files changed, 17 insertions, 0 deletions

diff --git a/gbp/git_utils.py b/gbp/git_utils.py
index 72abdd95..af55c207 100644
--- a/gbp/git_utils.py
+++ b/gbp/git_utils.py
@@ -6,6 +6,8 @@
 import subprocess
 import os.path
 from command_wrappers import (GitAdd, GitRm, copy_from)
+import dateutil.parser
+import calendar
 
 class GitRepositoryError(Exception):
     """Exception thrown by GitRepository"""
@@ -135,4 +137,19 @@ def replace_source_tree(repo, src_dir, filters, verbose=False):
             GitRm(verbose=verbose)(files)
         return not repo.is_clean()[0]
 
+
+def rfc822_date_to_git(rfc822_date):
+    """Parse a date in RFC822 format, and convert to a 'seconds tz' string.
+    >>> rfc822_date_to_git('Thu, 1 Jan 1970 00:00:01 +0000')
+    '1 +0000'
+    >>> rfc822_date_to_git('Thu, 20 Mar 2008 01:12:57 -0700')
+    '1206000777 -0700'
+    >>> rfc822_date_to_git('Sat, 5 Apr 2008 17:01:32 +0200')
+    '1207407692 +0200'
+    """
+    d = dateutil.parser.parse(rfc822_date)
+    seconds = calendar.timegm(d.utctimetuple())
+    tz = d.strftime("%z")
+    return '%d %s' % (seconds, tz)
+
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