[debian] Add util/genchangelog.

Makefile

@@ -20,10 +20,7 @@ deb-dep:
 
 DISTRO = unstable
 deb:
-	if [ -d .hg ]; \
-	then hg tip --template 'wmii-hg ($(VERSION)) $(DISTRO); urgency=low\n\n  * {desc}\n\n -- {author}  {date|rfc822date}\n'; \
-	else awk 'BEGIN{"date"|getline; print "wmii-hg ($(VERSION)) $(DISTRO); urgency=low\n\n  * Upstream build\n\n -- Kris Maglione <jg@suckless.org>  "$$0"\n"}'; \
-	fi >debian/changelog || true
+	$(ROOT)/util/genchangelog wmii-hg $(VERSION) $(DISTRO)
 	dpkg-buildpackage -rfakeroot -b -nc
 	[ -d .hg ] && hg revert debian/changelog || true
 

debian/changelog

@@ -1,4 +1,4 @@
-wmii-hg (hg2728) unstable; urgency=low
+wmii-hg (2728) unstable; urgency=low
 
   * Remove long deprecated special treatment of the '!' tag.
 

util/genchangelog

@@ -0,0 +1,30 @@
+#!/bin/sh
+set -ef
+
+ifs="$(echo)"
+name=$1
+vers=$2
+dist=$3
+desc="Upstream build"
+auth="Kris Maglione <kris@suckless.org>"
+date=$(date +'%a, %d %b %Y %T %z')
+if hg root >/dev/null 2>&1; then
+	t() { hg log -r . --template "{$@}"; }
+	vers=$(t rev)
+	desc=$(t desc)
+	auth=$(t author)
+	date=$(t 'date|rfc822date')
+fi
+
+cat >debian/changelog.new  <<!
+$name ($vers) $dist; urgency=low
+
+  * $desc
+
+ -- $auth  $date
+
+$(cat debian/changelog)
+!
+
+mv debian/changelog.new debian/changelog
+