Generate a 'latest release' and display (with date) on the homepage.

This makes the project look a little more 'alive'. :)

Makefile

 GIT = git --git-dir=$(GIT_DIR)/.git
 GIT_DIR = diffoscope.git
 
-DATA = _data/contributors.yml
+DATA = _data/contributors.yml _data/releases.yml
 
 all: $(DATA)
 	jekyll build --verbose --trace
@@ -15,5 +15,14 @@ _data/contributors.yml: $(GIT_DIR)
 	$(GIT) authors --list | cut -d '<' -f1 | sort | \
 		grep -v root | grep -v @ | sed -e 's@^@- @' -e 's@[ ]*$$@@' >> $@
 
+_data/releases.yml: $(GIT_DIR)
+	mkdir -p "$(dir $@)"
+	echo "# This file is automatically generated" > $@
+	dpkg-parsechangelog -l $(GIT_DIR)/debian/changelog --format=rfc822 --from=0 | \
+		awk -F': ' ' \
+			$$1 == "Version" { print "\n- version: " $$2 } \
+			$$1 == "Timestamp" { print "  timestamp: " $$2 } \
+			' >> $@
+
 clean:
 	rm -rf $(GIT_DIR) $(DATA) _site

index.md

@@ -7,6 +7,8 @@ title: "diffoscope: in-depth comparison of files, archives, and directories"
 
 <div class="lead">In-depth comparison of files, archives, and directories.</div>
 
+**Latest release**: {{ site.data.releases[0].version }} ({{ site.data.releases[0].timestamp|date: "%d %b %Y"  }})
+
 *diffoscope* will try to get to the bottom of what makes files or directories different. It will recursively unpack archives of many kinds and transform various binary formats into more human readable form to compare them. It can compare two tarballs, ISO images, or PDF just as easily.
 
 ----