lib/00_version.sh:
	echo "version='`git describe --tag`'" >$@
.PHONY: lib/00_version.sh

# The $(wildcard ...) return value is sorted and duplicates are
# removed from the list of dependencies. I need to mention
# lib/00_version.sh explicitly since it might not yet exist
mapsectorsh: mapsector lib/00_version.sh $(wildcard lib/[0-9][0-9]_*.sh)
	@echo "generating $@"
	@(							\
	    sed -n -e '1p' $<;					\
	    echo "#";						\
	    echo "# $@ automatically generated from";		\
	    for script in $^; do				\
		echo "#         $$script";			\
	    done;						\
	    sed -n -e '2,/^load$$/p' $<;			\
	    for script in $^; do				\
		if [ "$$script" == "$<" ]; then continue; fi;	\
		echo "#### $$script";				\
		echo;						\
		cat $$script;					\
		echo;						\
	    done;						\
	    sed -n -e '/^load$$/,$$p' $<;			\
	) >$@
	@sed -i -e 's/^load$$/####/' -eT -eh -eG -eH -eG -eH -eG -e'y/\n/#/' $@
	@chmod ugo+rx $@

NAME       := mapsector
CLOGDIR    := .git/changelogs
CHANGELOGS := $(shell lasttag=HEAD;								\
                      (git tag -l 'v*'; echo)							\
                          | while read tag; do							\
			      echo $(CLOGDIR)/$${tag}$${tag:+-}$$lasttag; 	\
                              lasttag=$$tag;							\
                          done)

$(CHANGELOGS): %:
	@echo "generating $@"
	@mkdir -p "$(CLOGDIR)"
	@(											\
            version="$@"; version="$${version#$(CLOGDIR)/}";					\
	    from="$${version%-*}"; version="$${version#*-}"; to="$$version";			\
	    if [ "$$from" == "$$to" ]; then from=""; fi;					\
            case "$$version" in									\
            HEAD) version="`git describe --tag --match='v*' | sed -e 's/-/~/' -e 's/-/./g'`";	\
                  release="UNRELEASED" ;;							\
            v*)   version="$${version#v}";							\
                  release="unstable" ;;								\
	    esac;										\
	    echo "$(NAME) ($$version) $$release; urgency=low";					\
	    echo;										\
	    git log --pretty=oneline --abbrev-commit $$from$${from:+..}$$to			\
	        | while read commit description; do						\
	            echo "  * [$$commit] $$description";					\
	    done;										\
	    echo;										\
	    date="`git log --format='%cD' $$to'^!'`";						\
	    author="`git log --format='%an <%ae>' $$to'^!'`";					\
	    echo " -- $$author  $$date";							\
	    echo;										\
	) >$@
.PHONY: $(word 1,$(CHANGELOGS))

debian/changelog: $(CHANGELOGS)
	cat $^ > $@

prepare: lib/00_version.sh debian/changelog
.PHONY: prepare

clean:
	rm -f mapsectorsh
	rm -f debian/changelog
	rm -f lib/00_version.sh
	rm -rf .git/changelogs
.PHONY: clean