WIP: Automatic version number

debian/changelog

@@ -1,4 +1,4 @@
-btop (1.2.13) UNRELEASED; urgency=low
+btop (1.x.y) UNRELEASED; urgency=low
 
   * Initial release for native upstream builds.
 

debian/rules

@@ -24,6 +24,19 @@ export PREFIX := /usr
 # @TODO: Does not seem to take effect as local include/fmt is found first
 export CXXFLAGS=-I/usr/include/fmt
 
+# Automatic version from sources
+VERSION := $(shell head -n100 src/btop.cpp 2>/dev/null | grep "Version =" | cut -f2 -d"\"")
+
+# This will affect the built .deb package but modifying debian/changelog during
+# build is too late for many tools and e.g. the .changes files will be using the
+# original version
+override_dh_auto_clean:
+	# Too complex, depends on devscripts
+	#dch --force-bad-version --newversion $(VERSION) "Automatic build"
+	# Simple sed on changelog (extra substvars does not seem to have effect)
+	sed "s/1.x.y/$(VERSION)/" -i debian/changelog debian/substvars
+	dh_auto_clean
+
 # From Debhelper 15 onwards this will be automatic, but until then
 # dh_auto_install defaults in a single package build in installing everything to
 # debian/btop which is undesired in this case, as we want to control the files

debian/substvars

@@ -0,0 +1 @@
+source:Version=1.x.y