[file-roller/gnome-2-26] Auto-generate the ChangeLog at dist time

[Paolo Bacchilega <paobac src gnome org>]

commit dbabc7c8ad5f48d1bc9b380508d8ed5532aec695
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Mon May 18 22:36:54 2009 +0200

    Auto-generate the ChangeLog at dist time
---
 ChangeLog => ChangeLog.pre-2-26 |    0
 Makefile.am                     |   24 ++++++++++++++++++++++++
 2 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog.pre-2-26
similarity index 100%
rename from ChangeLog
rename to ChangeLog.pre-2-26
diff --git a/Makefile.am b/Makefile.am
index 4cc1e56..aee9656 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -20,6 +20,7 @@ distuninstallcheck_listfiles = find . -type f -print | grep -v '^\./var/scrollke
 
 EXTRA_DIST = 			\
 	AUTHORS			\
+	ChangeLog.pre-2-26	\
 	HACKING			\
 	MAINTAINERS		\
 	NEWS			\
@@ -39,3 +40,26 @@ DISTCLEANFILES =                        \
 	intltool-update
 
 DISTCHECK_CONFIGURE_FLAGS = --disable-scrollkeeper
+
+distclean-local:
+	if test $(srdcir) = .; then :; else \
+		rm -f ChangeLog; \
+	fi
+
+dist: ChangeLog
+
+ChangeLog:
+	@echo Creating $@
+	@if test -d $(top_srcdir)/.git; then \
+		(GIT_DIR=$(top_srcdir)/.git $(top_srcdir)/missing --run git log FILE_ROLLER_2_26_1.. --stat -M -C --name-status  --date=short --no-color) | fmt --split-only > $  tmp \
+		 && mv -f $  tmp $@ \
+		 || ($(RM) $  tmp; \
+		     echo Failed to generate ChangeLog, your ChangeLog may be outdated >&2; \
+		     (test -f $@ || echo git-log is required to generate this file >> $@)); \
+	else \
+		test -f $@ || \
+		(echo A git checkout and git-log is required to generate ChangeLog >&2 && \
+		echo A git checkout and git-log is required to generate this file >> $@); \
+	fi
+
+.PHONY: ChangeLog