PYTESTS = $(wildcard test/test_*.py)
IMAGE = yadm/testbed:2020-12-29

.PHONY: all
all:
	@$(MAKE) usage | less

# Display usage for all make targets
.PHONY: usage
usage:
	@echo
	@echo 'make TARGET [option=value, ...]'
	@echo
	@echo 'TESTING'
	@echo
	@echo '  make test [testargs=ARGS]'
	@echo '    - Run all tests. "testargs" can specify a single string of arguments'
	@echo '      for py.test.'
	@echo
	@echo '  make <testfile>.py [testargs=ARGS]'
	@echo '    - Run tests from a specific test file. "testargs" can specify a'
	@echo '      single string of arguments for py.test.'
	@echo
	@echo '  make testhost [version=VERSION]'
	@echo '    - Create an ephemeral container for doing adhoc yadm testing. The'
	@echo '      HEAD revision of yadm will be used unless "version" is'
	@echo '      specified. "version" can be set to any commit, branch, tag, etc.'
	@echo '      The targeted "version" will be retrieved from the repo, and'
	@echo '      linked into the container as a local volume.'
	@echo
	@echo '  make scripthost [version=VERSION]'
	@echo '    - Create an ephemeral container for demonstrating a bug. After'
	@echo '      exiting the shell, a log of the commands used to illustrate the'
	@echo '      problem will be written to the file "script.txt". This file can'
	@echo '      be useful to developers to make a repeatable test for the'
	@echo '      problem.'
	@echo
	@echo 'LINTING'
	@echo
	@echo '  make testenv'
	@echo '    - Create a python virtual environment with the same dependencies'
	@echo "      used by yadm's testbed environment. Creating and activating"
	@echo '      this environment might be useful if your editor does real time'
	@echo '      linting of python files. After creating the virtual environment,'
	@echo '      you can activate it by typing:'
	@echo
	@echo '          source testenv/bin/activate'
	@echo
	@echo 'MANPAGES'
	@echo
	@echo '  make man'
	@echo '    - View yadm.1 as a standard man page.'
	@echo
	@echo '  make man-wide'
	@echo '    - View yadm.1 as a man page, using all columns of your display.'
	@echo
	@echo '  make man-ps'
	@echo '    - Create a postscript version of the man page.'
	@echo
	@echo 'FILE GENERATION'
	@echo
	@echo '  make yadm.md'
	@echo '    - Generate the markdown version of the man page (for viewing on'
	@echo '      the web).'
	@echo
	@echo '  make contrib'
	@echo '    - Generate the CONTRIBUTORS file, from the repo history.'
	@echo
	@echo 'INSTALLATION'
	@echo
	@echo '  make install PREFIX=<prefix>'
	@echo '    - Install yadm, manpage, etc. to <prefix>'
	@echo
	@echo 'UTILITIES'
	@echo
	@echo '  make sync-clock'
	@echo '    - Reset the hardware clock for the docker hypervisor host. This'
	@echo '      can be useful for docker engine hosts which are not'
	@echo '      Linux-based.'
	@echo

# Make it possible to run make specifying a py.test test file
.PHONY: $(PYTESTS)
$(PYTESTS):
	@$(MAKE) test testargs="-k $@ $(testargs)"
%.py:
	@$(MAKE) test testargs="-k $@ $(testargs)"

# Run all tests with additional testargs
.PHONY: test
test:
	@if [ -f /.yadmtestbed ]; then \
		cd /yadm && \
		py.test -v $(testargs); \
	else \
		$(MAKE) -s require-docker && \
		docker run \
			--rm -t$(shell test -t 0 && echo i) \
			-v "$(CURDIR):/yadm:ro" \
			$(IMAGE) \
			make test testargs="$(testargs)"; \
	fi

.PHONY: .testyadm
.testyadm: version ?= HEAD
.testyadm:
	@echo "Using yadm version=\"$(version)\""
	@if [ "$(version)" = "local" ]; then \
		cp -f yadm $@; \
	else \
		git show $(version):yadm > $@; \
	fi
	@chmod a+x $@

.PHONY: testhost
testhost: require-docker .testyadm
	@echo "Starting testhost"
	@docker run \
		-w /root \
		--hostname testhost \
		--rm -it \
		-v "$(CURDIR)/.testyadm:/bin/yadm:ro" \
		$(IMAGE) \
		bash -l

.PHONY: scripthost
scripthost: require-docker .testyadm
	@echo "Starting scripthost \(recording script\)"
	@printf '' > script.gz
	@docker run \
		-w /root \
		--hostname scripthost \
		--rm -it \
		-v "$(CURDIR)/script.gz:/script.gz:rw" \
		-v "$(CURDIR)/.testyadm:/bin/yadm:ro" \
		$(IMAGE) \
		bash -c "script /tmp/script -q -c 'bash -l'; gzip < /tmp/script > /script.gz"
	@echo
	@echo "Script saved to $(CURDIR)/script.gz"


.PHONY: testenv
testenv:
	@echo 'Creating a local virtual environment in "testenv/"'
	@echo
	python3 -m venv --clear testenv
	testenv/bin/pip3 install --upgrade pip setuptools
	testenv/bin/pip3 install --upgrade -r test/requirements.txt;
	@for v in $$(sed -rn -e 's:.*/yadm-([0-9.]+)$$:\1:p' test/Dockerfile); do \
		git show $$v:yadm > testenv/bin/yadm-$$v; \
		chmod +x testenv/bin/yadm-$$v; \
	done
	@echo
	@echo 'To activate this test environment type:'
	@echo '  source testenv/bin/activate'

.PHONY: image
image:
	@docker build -f test/Dockerfile . -t "$(IMAGE)"


.PHONY: man
man:
	@groff -man -Tascii ./yadm.1 | less

.PHONY: man-wide
man-wide:
	@man ./yadm.1

.PHONY: man-ps
man-ps:
	@groff -man -Tps ./yadm.1 > yadm.ps

yadm.md: yadm.1
	@groff -man -Tascii ./yadm.1 | col -bx | sed 's/^[A-Z]/## &/g' | sed '/yadm(1)/d' > yadm.md

.PHONY: contrib
contrib: SHELL = /bin/bash
contrib:
	@echo -e "CONTRIBUTORS\n" > CONTRIBUTORS
	@IFS=$$'\n'; for author in $$(git shortlog -ns master gh-pages develop dev-pages | cut -f2); do \
		git log master gh-pages develop dev-pages \
			--author="$$author" --format=tformat: --numstat | \
			awk "{sum += \$$1 + \$$2} END {print sum \"\t\" \"$$author\"}"; \
	done | sort -nr | cut -f2 >> CONTRIBUTORS

.PHONY: install
install:
	@[ -n "$(PREFIX)" ] || { echo "PREFIX is not set"; exit 1; }
	@{\
		set -e                                               ;\
		bin="$(PREFIX)/bin"                                  ;\
		doc="$(PREFIX)/share/doc/yadm"                       ;\
		man="$(PREFIX)/share/man/man1"                       ;\
		install -d "$$bin" "$$doc" "$$man"                   ;\
		install -m 0755 yadm "$$bin"                         ;\
		install -m 0644 yadm.1 "$$man"                       ;\
		install -m 0644 CHANGES CONTRIBUTORS LICENSE "$$doc" ;\
		cp -r contrib "$$doc"                                ;\
	}

.PHONY: sync-clock
sync-clock:
	docker run --rm --privileged alpine hwclock -s

.PHONY: require-docker
require-docker:
	@if ! command -v "docker" > /dev/null 2>&1; then \
		echo "Sorry, this make target requires docker to be installed."; \
		false; \
	fi