# Various one-liners which I'm too lazy to remember.
# Basically a collection of really small shell scripts.

MAKEFLAGS += --no-builtin-rules --no-builtin-variables --warn-undefined-variables
unexport MAKEFLAGS
.DEFAULT_GOAL := all
.DELETE_ON_ERROR:
.SUFFIXES:
SHELL := bash
.SHELLFLAGS := -eu -o pipefail -c

.PHONY: DO
DO:

escape = $(subst ','\'',$(1))

define noexpand
ifeq ($$(origin $(1)),environment)
    $(1) := $$(value $(1))
endif
ifeq ($$(origin $(1)),environment override)
    $(1) := $$(value $(1))
endif
ifeq ($$(origin $(1)),command line)
    override $(1) := $$(value $(1))
endif
endef

PROJECT := cgitize
# Enable buildx support:
export DOCKER_CLI_EXPERIMENTAL := enabled
# Target platforms (used by buildx):
PLATFORMS := linux/amd64,linux/armhf
# In case buildx isn't installed (e.g. on Ubuntu):
BUILDX_VERSION := v0.4.2
# Docker Hub credentials:
DOCKER_USERNAME := egortensin

ifdef DOCKER_PASSWORD
$(eval $(call noexpand,DOCKER_PASSWORD))
endif

.PHONY: all
all: build

.PHONY: login
login:
ifndef DOCKER_PASSWORD
	$(error Please define DOCKER_PASSWORD)
endif
	@echo '$(call escape,$(DOCKER_PASSWORD))' | docker login --username '$(call escape,$(DOCKER_USERNAME))' --password-stdin

.PHONY: build
# Build natively by default.
build: docker/build

.PHONY: clean
clean:
	docker system prune --all --force --volumes

.PHONY: push
# Push multi-arch images by default.
push: buildx/push

.PHONY: check-build
check-build:
ifndef FORCE
	$(warning Going to build natively; consider `docker buildx build` instead)
endif

.PHONY: check-push
check-push:
ifndef FORCE
	$(error Please use `docker buildx build --push` instead)
endif

.PHONY: docker/build
# `docker build` has week support for multiarch repos (you need to use multiple
# Dockerfile's, create a manifest manually, etc.), so it's only here for
# testing purposes, and native builds.
docker/build: check-build
	docker build -t '$(call escape,$(DOCKER_USERNAME))/$(call escape,$(PROJECT))' .

.PHONY: docker/push
# `docker push` would replace the multiarch repo with a single image by default
# (you'd have to create a manifest and push it instead), so it's only here for
# testing purposes.
docker/push: check-push docker/build
	docker push '$(call escape,$(DOCKER_USERNAME))/$(call escape,$(PROJECT))'

# The simple way to build multiarch repos is `docker buildx`.

binfmt_image := docker/binfmt:66f9012c56a8316f9244ffd7622d7c21c1f6f28d

.PHONY: fix-binfmt
fix-binfmt:
	docker run --rm --privileged '$(call escape,$(binfmt_image))'

curl := curl --silent --show-error --location --dump-header - --connect-timeout 20

buildx_url := https://github.com/docker/buildx/releases/download/$(BUILDX_VERSION)/buildx-$(BUILDX_VERSION).linux-amd64

.PHONY: buildx/install
buildx/install:
	mkdir -p -- ~/.docker/cli-plugins/
	$(curl) --output ~/.docker/cli-plugins/docker-buildx -- '$(call escape,$(buildx_url))'
	chmod +x -- ~/.docker/cli-plugins/docker-buildx

.PHONY: buildx/create
buildx/create: fix-binfmt
	docker buildx create --use --name '$(call escape,$(PROJECT))_builder'

.PHONY: buildx/rm
buildx/rm:
	docker buildx rm '$(call escape,$(PROJECT))_builder'

.PHONY: buildx/build
buildx/build:
	docker buildx build -t '$(call escape,$(DOCKER_USERNAME))/$(call escape,$(PROJECT))' --platform '$(call escape,$(PLATFORMS))' --progress plain .

.PHONY: buildx/push
buildx/push:
	docker buildx build -t '$(call escape,$(DOCKER_USERNAME))/$(call escape,$(PROJECT))' --platform '$(call escape,$(PLATFORMS))' --progress plain --push .

venv_dir := .venv

.PHONY: venv
venv:
	rm -rf -- '$(call escape,$(venv_dir))'
	mkdir -p -- '$(call escape,$(venv_dir))'
	python -m venv -- '$(call escape,$(venv_dir))'
	. '$(call escape,$(venv_dir))/bin/activate' && pip install -r requirements.txt

.PHONY: test
test:
	. '$(call escape,$(venv_dir))/bin/activate' && python -m unittest --verbose --buffer