[telegnome] Generate ChangeLog from git history

[Colin Watson <cjwatson src gnome org>]

commit 1fba9ab61538e6198e5019fa8dfd01e835276679
Author: Colin Watson <cjwatson debian org>
Date:   Sun Jan 31 02:01:31 2016 +0000

    Generate ChangeLog from git history

 ChangeLog => ChangeLog-pre-2-0 |    0
 Makefile.am                    |   11 +++++++++++
 2 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog-pre-2-0
similarity index 100%
rename from ChangeLog
rename to ChangeLog-pre-2-0
diff --git a/Makefile.am b/Makefile.am
index 27b4c8d..6eb7357 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -2,6 +2,7 @@ SUBDIRS = data src po pixmaps doc
 
 EXTRA_DIST = $(srcdir)/telegnome.desktop.in \
        BUGS \
+       ChangeLog-pre-2-0 \
        MAINTAINERS \
        gnome-doc-utils.make \
        intltool-extract.in \
@@ -21,3 +22,13 @@ apps_DATA = $(apps_in_files:.desktop.in=.desktop)
 @INTLTOOL_DESKTOP_RULE@
 
 ACLOCAL_AMFLAGS = -I m4
+
+# Build ChangeLog from git history
+ChangeLog:
+       $(AM_V_GEN) if test -d "$(top_srcdir)/.git"; then \
+               GIT_DIR="$(top_srcdir)/.git" git log f9312743cfed0e512e7870a42fcb2a1b376aaf3c.. --stat > $@; \
+       fi
+
+dist: ChangeLog
+
+.PHONY: ChangeLog