[zenity/gnome-2-28] Autogenerate ChangeLog on distcheck

[Lucas Almeida Rocha <lucasr src gnome org>]

commit 294a129b84dcdad906d2d8a2beb2a596b198a77d
Author: Lucas Rocha <lucasr gnome org>
Date:   Mon Aug 10 22:04:24 2009 +0100

    Autogenerate ChangeLog on distcheck

 Makefile.am |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index b224ee5..03accc1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -21,3 +21,17 @@ DISTCLEANFILES =                \
 	gnome-doc-utils.make
 
 DISTCHECK_CONFIGURE_FLAGS = --disable-scrollkeeper
+
+dist-hook:
+	@if test -d "$(srcdir)/.git"; \
+	then \
+		echo Creating ChangeLog && \
+		( cd "$(top_srcdir)" && \
+		  echo '# Generated by Makefile. Do not edit.'; echo; \
+		  $(top_srcdir)/missing --run git log --stat ) > ChangeLog.tmp \
+		&& mv -f ChangeLog.tmp $(top_distdir)/ChangeLog \
+		|| ( rm -f ChangeLog.tmp ; \
+		     echo Failed to generate ChangeLog >&2 ); \
+	else \
+		echo A git clone is required to generate a ChangeLog >&2; \
+	fi