[pygtk] Retire hand-written ChangeLog; autocreate from Git history

[Paul Pogonyshev <paulp src gnome org>]

commit 029b2905baec78b370e76e1b2340dc2ee2ddaea1
Author: Paul Pogonyshev <pogonyshev gmx net>
Date:   Tue May 12 23:32:40 2009 +0300

    Retire hand-written ChangeLog; autocreate from Git history
    
    Basically copied over from GLib source tree.
---
 ChangeLog => ChangeLog.pre-2-16 |    2 ++
 Makefile.am                     |   33 +++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/ChangeLog b/ChangeLog.pre-2-16
similarity index 99%
rename from ChangeLog
rename to ChangeLog.pre-2-16
index 90523de..c9d8b30 100644
--- a/ChangeLog
+++ b/ChangeLog.pre-2-16
@@ -1,3 +1,5 @@
+=== ChangeLog discontinued ===
+
 2009-04-06  Brian Cameron <brian cameron sun com> 
 
 	Bug 397544 â?? Numeric is no longer maintained
diff --git a/Makefile.am b/Makefile.am
index 2472727..d2a1635 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -14,6 +14,7 @@ CLEANFILES =
 EXTRA_DIST = 					\
 	ChangeLog.pre-2-0			\
 	ChangeLog.pre-2-6			\
+	ChangeLog.pre-2-16			\
 	config.h.win32 				\
 	MANIFEST.in 				\
 	MAPPING 				\
@@ -29,6 +30,9 @@ EXTRA_DIST = 					\
 	m4/jhflags.m4				\
 	m4/python.m4
 
+BUILT_EXTRA_DIST = 		\
+	ChangeLog
+
 INCLUDES = 				\
 	$(PYTHON_INCLUDES) 		\
 	$(PYGOBJECT_CFLAGS)		\
@@ -139,6 +143,35 @@ doc-dist:
 	rm -fr pygtk
 
 
+distclean-local:
+	if test $(srcdir) = .; then :; else \
+	    rm -f $(BUILT_EXTRA_DIST); \
+	fi
+
+dist-hook: $(BUILT_EXTRA_DIST)
+	files='$(BUILT_EXTRA_DIST)'; \
+	for f in $$files; do \
+	  if test -f $$f; then d=.; else d=$(srcdir); fi; \
+	  rm -f $(distdir)/$$f && cp $$d/$$f $(distdir) || exit 1; done
+
+
+.PHONY: ChangeLog
+
+ChangeLog:
+	@echo Creating $@
+	@if test -d "$(srcdir)/.git"; then \
+	  (GIT_DIR=$(top_srcdir)/.git ./missing --run git log PYGTK_2_15_0^^.. --stat) | 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+	      echo Failed to generate ChangeLog, your ChangeLog may be outdated 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
+
+
 all: $(pkgpyexec_LTLIBRARIES:.la=.so)
 clean-local:
 	rm -f $(pkgpyexec_LTLIBRARIES:.la=.so)