Makefile

.ONESHELL:
SHELL = bash
.SHELLFLAGS = -eo pipefail -c

.DEFAULT: all
.PHONY: all bump-% clean config dist-clean fetch-thirdparty helpers lint re setup serve script

BUILD_DIR  ?= build
BUILD_INFO := $(BUILD_DIR)/meson-info/intro-buildoptions.json

CONFIG ?= config.ini

define which
$(eval p:=$(and $1,$(shell which $(firstword $1))))$(and $p,$p $(wordlist 2,$(words $1),$1))
endef

define find_program
$(strip $(or $(call $1),\
	$(call which,$2),\
	$(call which,$3),\
	$(call which,$4),\
	$(call which,$5),\
	$(error Program '$2' not found or not executable)))
endef

define config
[binaries]
ar     = '$(call find_program,EMAR,emar)'
c      = ['$(call find_program,CCACHE,ccache,sccache,env)', '$(call find_program,EMCC,emcc)']
ranlib = '$(call find_program,EMRANLIB,emranlib)'
strip  = '$(call find_program,EMSTRIP,emstrip)'

[project options]
# Image formats.
gif  = $(or $(GIF),true)
webp = $(or $(WEBP),true)
# Output options.
wasm = $(or $(WASM),true)

[libwebp:project options]
disable-stats = true
libwebpdecoder = 'enabled'
libwebpdemux = 'enabled'
near-lossless = false
reduce-csp = true
reduce-size = true

# vim: ft=cfg
endef

define newline


endef

# Programs.
MESON ?= meson

all: script

clean:
	rm --force --recursive $(BUILD_DIR)

config: $(CONFIG)

dist-clean:
	-rm --force --recursive $(wildcard config.ini config-*.ini build/ build-*/ $(patsubst %.wrap,%*/,$(wildcard subprojects/*.wrap)))

fetch-thirdparty:
	$(MESON) subprojects download --num-processes 3

re: clean
	@$(MAKE) --no-print-directory all

setup: $(BUILD_INFO)

$(BUILD_INFO): $(CONFIG)
	$(strip $(MESON) setup --auto-features=disabled --cross-file=$(CONFIG) $(if $(wildcard $(BUILD_INFO)),--wipe) $(BUILD_DIR))

helpers lint script serve: $(BUILD_INFO)
	$(MESON) compile -C $(BUILD_DIR) -v $@

$(CONFIG): Makefile
	cat >$@ <<'EOF'
	$(config)
	EOF

# Helpers for bumping requirements.

CURL = curl --location --silent

bump-emsdk:
	@image="$$(
	  $(CURL) 'https://registry.hub.docker.com/v2/repositories/emscripten/emsdk/tags' |
	  jq -r '
	    (.results[] | select(.name == "latest").digest) as $$digest |
	    .results[] | select(.digest == $$digest) | select(.name != "latest") |
	    .name + "@" + $$digest
	  '
	)"
	echo "bump emsdk to $${image%%@*}"
	sed -i -e "s/^EMSDK_VERSION ?= .*/EMSDK_VERSION ?= $$image/" Makefile

bump-esbuild:
	@package='$(@:bump-%=%)'
	version="$$({ npm outdated --json || true; } | jq -r ".$$package.latest")"
	echo "bump esbuild to $$version"
	npm install --package-lock-only --save-exact "$$package@$$version"

bump-meson bump-ninja:
	@package='$(@:bump-%=%)'
	version="$$(
	  $(CURL) "https://pypi.python.org/pypi/$$package/json" |
	  jq -r '.info.version'
	)"
	hashes="$$(
	  $(CURL) "https://pypi.python.org/pypi/$$package/$$version/json" |
	  jq -j '.urls | sort[].digests.sha256 | " --hash=sha256:" + .'
	)"
	echo "bump $$package to $$version"
	sed -i -e "s/^$$package==.*/$$package==$$version$$hashes/" requirements.txt

# Containers support.

EMSDK_VERSION ?= 3.1.71@sha256:9922c93314b63a1d9ceba2e76f03737f1f9cc4b7350341211e2d3555633ffdd5

.PHONY: container-build container-config

container-build:
	mkdir -p $(BUILD_ROOT)
	cp package.json package-lock.json $(BUILD_ROOT)/
	npm config set prefix='~/.local/' update-notifier=false
	npm ci --prefix $(BUILD_ROOT) --no-audit
	python3 -m venv $(BUILD_ROOT)/venv --system-site-packages --without-pip
	$(abspath $(BUILD_ROOT)/venv/bin/python) -m pip install --no-warn-script-location --requirement requirements.txt
	env PATH="$(abspath $(BUILD_ROOT)/node_modules/esbuild/bin):$(abspath $(BUILD_ROOT)/venv/bin):$$PATH" $(MAKE) all

container-config: config

define container_rules
$1        ?= $2
$1_BUILD  ?= build-$2
$1_CONFIG ?= config-$2.ini
.PHONY: $(patsubst %,$2-%,build clean config)
$2-build $2-config:
	$$(strip $$(call find_program,$1,$2) run --mount type=bind,source='$$(CURDIR),target=/src' \
		--interactive --rm --tty $3 '$4emscripten/emsdk$$(EMSDK_VERSION:%=:%)' \
		env MAKEFLAGS='$$(filter-out --jobserver-%,$$(MAKEFLAGS))' \
		make BUILD_ROOT='$$($1_BUILD)' BUILD_DIR='$$($1_BUILD)/build' CONFIG='$$($1_CONFIG)' \
		-C /src $$(@:$2-%=container-%) \
	)
$2-clean:
	rm --force --recursive '$$($1_BUILD)' '$$($1_CONFIG)'
endef

# For completion.
docker-build docker-config docker-clean podman-config podman-build podman-clean:

$(eval $(call container_rules,DOCKER,docker,--user "$$$$UID:$$$$GID",))
$(eval $(call container_rules,PODMAN,podman,,docker.io/))