# Makefile for RISC-V ISA Manuals
#
# This work is licensed under the Creative Commons Attribution-ShareAlike 4.0
# International License. To view a copy of this license, visit
# http://creativecommons.org/licenses/by-sa/4.0/ or send a letter to
# Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
#
# SPDX-License-Identifier: CC-BY-SA-4.0
#
# Description:
# 
# This Makefile is designed to automate the process of building and packaging 
# the documentation for RISC-V ISA Manuals. It supports multiple build targets 
# for generating documentation in various formats (PDF, HTML, EPUB).
#
# Building with a preinstalled docker container is recommended.
# Install by running:
#
#   docker pull riscvintl/riscv-docs-base-container-image:latest
#

DOCS := riscv-privileged riscv-unprivileged

DATE ?= $(shell date +%Y-%m-%d)
DOCKER_IMG := riscvintl/riscv-docs-base-container-image:latest
ifneq ($(SKIP_DOCKER),true)
	DOCKER_CMD := docker run --rm -v ${PWD}:/build -w /build \
	${DOCKER_IMG} \
	/bin/sh -c
	DOCKER_QUOTE := "
endif

SRC_DIR := src
BUILD_DIR := build

DOCS_PDF := $(addprefix $(BUILD_DIR)/, $(addsuffix .pdf, $(DOCS)))
DOCS_HTML := $(addprefix $(BUILD_DIR)/, $(addsuffix .html, $(DOCS)))
DOCS_EPUB := $(addprefix $(BUILD_DIR)/, $(addsuffix .epub, $(DOCS)))

ENV := LANG=C.utf8
XTRA_ADOC_OPTS :=
ASCIIDOCTOR_PDF := $(ENV) asciidoctor-pdf
ASCIIDOCTOR_HTML := $(ENV) asciidoctor
ASCIIDOCTOR_EPUB := $(ENV) asciidoctor-epub3
OPTIONS := --trace \
           -a compress \
           -a mathematical-format=svg \
           -a pdf-fontsdir=docs-resources/fonts \
           -a pdf-theme=docs-resources/themes/riscv-pdf.yml \
           $(XTRA_ADOC_OPTS) \
           -D build \
           --failure-level=ERROR
REQUIRES := --require=asciidoctor-bibtex \
            --require=asciidoctor-diagram \
            --require=asciidoctor-lists \
            --require=asciidoctor-mathematical

.PHONY: all build clean build-container build-no-container build-docs build-pdf build-html build-epub

all: build

build-docs: $(DOCS_PDF) $(DOCS_HTML) $(DOCS_EPUB)
build-pdf: $(DOCS_PDF)
build-html: $(DOCS_HTML)
build-epub: $(DOCS_EPUB)

ALL_SRCS := $(shell git ls-files $(SRC_DIR))

$(BUILD_DIR)/%.pdf: $(SRC_DIR)/%.adoc $(ALL_SRCS)
	$(DOCKER_CMD) $(DOCKER_QUOTE) $(ASCIIDOCTOR_PDF) $(OPTIONS) $(REQUIRES) $< $(DOCKER_QUOTE)

$(BUILD_DIR)/%.html: $(SRC_DIR)/%.adoc $(ALL_SRCS)
	$(DOCKER_CMD) $(DOCKER_QUOTE) $(ASCIIDOCTOR_HTML) $(OPTIONS) $(REQUIRES) $< $(DOCKER_QUOTE)

$(BUILD_DIR)/%.epub: $(SRC_DIR)/%.adoc $(ALL_SRCS)
	$(DOCKER_CMD) $(DOCKER_QUOTE) $(ASCIIDOCTOR_EPUB) $(OPTIONS) $(REQUIRES) $< $(DOCKER_QUOTE)

build:
	@echo "Checking if Docker is available..."
	@if command -v docker >/dev/null 2>&1 ; then \
		echo "Docker is available, building inside Docker container..."; \
		$(MAKE) build-container; \
	else \
		echo "Docker is not available, building without Docker..."; \
		$(MAKE) build-no-container; \
	fi

build-container:
	@echo "Starting build inside Docker container..."
	$(MAKE) build-docs
	@echo "Build completed successfully inside Docker container."

build-no-container:
	@echo "Starting build..."
	$(MAKE) SKIP_DOCKER=true build-docs
	@echo "Build completed successfully."

# Update docker image to latest
docker-pull-latest:
	docker pull ${DOCKER_IMG}

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