### -*-makefile-*-

###--------------------------------------------------------------------------
### User-serviceable parts.

## Source directory.
srcdir			:= $(dir $(lastword $(MAKEFILE_LIST)))

## Installation directories.
prefix			 = /usr/local
exec_prefix		 = ${prefix}
bindir			 = ${exec_prefix}/bin
datadir			 = ${prefix}/share
mandir			 = ${datadir}/man
man1dir			 = ${mandir}/man1

## User configuration.
-include config.mk

###--------------------------------------------------------------------------
### Machinery.

## Preliminaries.
all:
clean::
.PHONY: all clean
.SECONDEXPANSION:

force:
.PHONY: force

VPATH			 = $(srcdir)

## Layout.
INSTDIRS		 =

INSTDIRS		+= bin
bin_FILES		 =
bin_INSTCMD		 = install -t$(bindir) -m755

INSTDIRS		+= man1
man1_FILES		 =
man1_INSTCMD		 = install -t$(man1dir) -m644

## Version number.
VERSION			:= $(shell git describe --always --abbrev=4 --dirty=+)
-include version-stamp.mk
ifneq ($(VERSION),$(OLD_VERSION))
  FORCE_VERSION		 = force
else
  FORCE_VERSION		 =
endif
version-stamp.mk: $(FORCE_VERSION)
	echo "OLD_VERSION = $(VERSION)" >$@.new && mv $@.new $@
clean::; rm version-stamp.mk

## The main program.
bin_FILES		+= dkim-keys
dkim-keys: dkim-keys.in version-stamp.mk
	sed 's/@VERSION@/$(VERSION)/g' $< >$@.new && \
		chmod +x $@.new && mv $@.new $@

## The manual.
man1_FILES		+= dkim-keys.1
dkim-keys.1: dkim-keys.in version-stamp.mk
	pod2man -s1 -dkim-keys -r"$(VERSION)" \
			 -c"distorted.org.uk utilities" \
			$< >$@.new && \
		mv $@.new $@

## Building.
TARGETS			 = $(foreach d,$(INSTDIRS), $($d_FILES))
all: $(TARGETS)
clean::; rm -f $(TARGETS)

## Installation.
%/:; install -d $@

INSTALLS		 = $(addprefix install/, $(INSTDIRS))
install: $(INSTALLS)
$(INSTALLS): install/%: $$($$*_FILES) | $$($$*dir)/
	$($*_INSTCMD) $+

UNINSTALLS		 = $(addprefix uninstall/, $(INSTDIRS))
uninstall: $(UNINSTALLS)
$(UNINSTALLS): uninstall/%:
	rm -f $(addprefix $($*dir)/,$($*_FILES))
.PHONY: install $(INSTALLS) uninstall $(UNINSTALLS)