# This Makefile generates the manual pages from the markdown README.mds. It depends
# on https://github.com/mmarkdown/mmark to be installed. Generally we want this to be
# updated before doing a release. The Debian package, for instance, looks at these pages
# and will install them on your system.

MMARK_VERSION:=2.2.4
PLUGINS:=$(wildcard plugin/*/README.md)
READMES:=$(subst plugin/,,$(PLUGINS))
READMES:=$(subst /README.md,,$(READMES))
PLUGINS:=$(subst plugin/,coredns-,$(PLUGINS))
PLUGINS:=$(subst /README.md,(7),$(PLUGINS))

all: mmark man/coredns.1 man/corefile.5 plugins

GO           ?= go
GOHOSTOS     ?= $(shell $(GO) env GOHOSTOS)
GOHOSTARCH   ?= $(shell $(GO) env GOHOSTARCH)
GO_BUILD_PLATFORM ?= $(GOHOSTOS)_$(GOHOSTARCH)

FIRST_GOPATH := $(firstword $(subst :, ,$(shell $(GO) env GOPATH)))
MMARK_BIN    := $(FIRST_GOPATH)/bin/mmark
MMARK        := $(FIRST_GOPATH)/bin/mmark -man

MMARK_URL := https://github.com/mmarkdown/mmark/releases/download/v$(MMARK_VERSION)/mmark_$(MMARK_VERSION)_$(GO_BUILD_PLATFORM).tgz

.PHONY: mmark
mmark: $(MMARK_BIN)

$(MMARK_BIN):
	$(eval MMARK_TMP := $(shell mktemp -d))
	curl -s -L $(MMARK_URL) | tar -xvzf - -C $(MMARK_TMP)
	mkdir -p $(FIRST_GOPATH)/bin
	cp $(MMARK_TMP)/mmark $(FIRST_GOPATH)/bin/mmark
	rm -r $(MMARK_TMP)

man/coredns.1: coredns.1.md
	@/bin/echo -e '%%%\n title = "coredns 1"\n' \
		'area = "CoreDNS"\n workgroup = "CoreDNS"\n%%%\n\n' > $@.header
	@cat $@.header $< > $@.md && rm $@.header
	@sed -i -e "s/@@PLUGINS@@/$(PLUGINS)/" $@.md
	$(MMARK) $@.md > $@ && rm $@.md

man/corefile.5: corefile.5.md
	@/bin/echo -e '%%%\n title = "corefile 5"\n' \
		'area = "CoreDNS"\n workgroup = "CoreDNS"\n%%%\n\n' > $@.header
	@cat $@.header $< > $@.md && rm $@.header
	$(MMARK) $@.md > $@ && rm $@.md

.PHONY: plugins
plugins:
	for README in $(READMES); do \
	    $(MAKE) -f Makefile.doc man/coredns-$$README.7; \
	done

man/coredns-%.7: plugin/%/README.md
	@/bin/echo -e "%%%\n title = \"`basename $@ | sed s\/\.7\/\/` 7\"\n" \
		'area = "CoreDNS"\n workgroup = "CoreDNS Plugins"\n%%%\n\n' > $@.header
	@cat $@.header $< > $@.md && rm $@.header
	@sed -i '/^# .*/d' $@.md
	$(MMARK) $@.md > $@ && rm $@.md

PHONY: clean
clean:
	rm -f man/*