# Taken and adapted from https://github.com/riscv/riscv-isa-manual/blob/main/Makefile
# vim: noexpandtab:tabstop=4:shiftwidth=4

DOCS := central-execution-engine-spec

DOCKER_IMG := asciidoctor/docker-asciidoctor:latest 

ENV := LANG=C.utf8

OPTIONS := -D build \
           --trace \
           --failure-level=ERROR

REQUIRES := --require=asciidoctor-diagram

DOCKER_IS_ROOTLESS = \
    $(shell ! ps ux | grep -v grep | grep dockerd-rootless >/dev/null ; echo $$?)
ifneq "$(DOCKER_IS_ROOTLESS)" "1"
    # Rooted Docker requires this flag so that the files it creates are
    # owned by the current user instead of root. Rootless docker does not
    # require it, and Podman doesn't either since it is always rootless.
    DOCKER_USER_ARG := --user $(shell id -u)
    SUDO_PREFIX := sudo
endif

DOCKER_CMD = \
$(SUDO_PREFIX) docker run --rm \
    -v $(PWD)/$@.workdir:/build \
    -w /build \
	$(DOCKER_USER_ARG) \
    $(DOCKER_IMG) \
    /bin/sh -c

WORKDIR_SETUP = \
    rm -rf $@.workdir && \
    mkdir -p $@.workdir && \
    cp -r src $@.workdir

WORKDIR_TEARDOWN = \
    mv $@.workdir/$@ $@ && \
    rm -rf $@.workdir

SRC_DIR   := src
BUILD_DIR := build

ALL_SRC  := $(shell find $(SRC_DIR) -type f -name '*.adoc' -print)
DOCS_PDF := $(addprefix $(BUILD_DIR)/, $(addsuffix .pdf, $(DOCS)))

.PHONY: all build docker-pull-latest clean

all: build-pdf

build-pdf: $(DOCS_PDF)

$(BUILD_DIR)/%.pdf: $(SRC_DIR)/%.adoc $(ALL_SRC)
	$(WORKDIR_SETUP)
	$(DOCKER_CMD) '$(ENV) asciidoctor-pdf $(OPTIONS) $(REQUIRES) $<'
	$(WORKDIR_TEARDOWN)

docker-pull-latest:
	$(SUDO_PREFIX) docker pull $(DOCKER_IMG)

clean:
	@echo "Cleaning up generated files..."
	rm -rf $(BUILD_DIR)
	@echo "Cleanup completed."