[evince/gnome-2-26] [build] ChangeLog is autogenerated now

[Nickolay V. Shmyrev <nshmyrev src gnome org>]

commit 556ba37ec60959f81f07b18aa570c831e9a9e794
Author: Nickolay V. Shmyrev <nshmyrev yandex ru>
Date:   Tue May 19 00:37:57 2009 +0400

    [build] ChangeLog is autogenerated now
---
 ChangeLog => ChangeLog.pre-git |    0
 Makefile.am                    |   15 +++++++++++++++
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog.pre-git
similarity index 100%
rename from ChangeLog
rename to ChangeLog.pre-git
diff --git a/Makefile.am b/Makefile.am
index ff5bd82..4f233e4 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -49,3 +49,18 @@ DISTCHECK_CONFIGURE_FLAGS = --disable-schemas-install --disable-scrollkeeper --e
 
 # Ignore scrollkeeper issues for now.  @#*$& scrollkeeper
 distuninstallcheck_listfiles = find . -type f -print | grep -v scrollkeeper | grep -v /share/gnome/help/ | grep -v \.omf
+
+ChangeLog:
+	@echo Creating $@
+	@if test -d "$(srcdir)/.git"; then \
+	  (GIT_DIR=$(top_srcdir)/.git ./missing --run git log -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+	      echo Failed to generate ChangeLog, your ChangeLog may be outdated 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
+