gnulib-tool.py: Make option --version work.

* pygnulib/constants.py (__copyright__): Bump copyright year.
* pygnulib/GLInfo.py (GLInfo.authors): Add a comma after the
second-to-last author.
(GLInfo.copyright): Show only the last modification year.
(GLInfo.date): Check whether git and GNU date are available. Use
'git log ChangeLog', not 'git log'. Run 'git log' in the gnulib
directory, not in the current directory. Search for 'Date:' only at the
beginning of a line. As a fallback, look at the first ChangeLog entry.
(GLInfo.version): Check whether git is available. Run git-version-gen in
the gnulib directory, not in the current directory. Replace '-dirty'
with '-modified'. As a fallback, return the empty string.
* gnulib-tool.py (main) [--version]: Add a space before the version.

1 files changed, 4 insertions, 1 deletions

diff --git a/gnulib-tool.py b/gnulib-tool.py
index 1a6bd9e948..c4386133a6 100755
--- a/gnulib-tool.py
+++ b/gnulib-tool.py
@@ -397,8 +397,11 @@ def main():
         print(info.usage())
         sys.exit(0)
     if cmdargs.version != None:
+        version = info.version()
+        if version != '':
+            version = ' ' + version
         message = '''gnulib-tool (%s %s)%s\n%s\n%s\n\nWritten by %s.''' \
-            % (info.package(), info.date(), info.version(), info.copyright(),
+            % (info.package(), info.date(), version, info.copyright(),
                info.license(), info.authors())
         print(message)
         sys.exit(0)