# Directories.
FROM ?= content
TO   ?= build/local
WITH ?= assets

# Content from external repositories.
EXTERNAL ?=

# Deployment.
DEPLOY_URL ?= "https://giucal.it/makesite"
DEPLOY_DIR ?= build/public
DEPLOY_PREFIX ?=
DEPLOY_BRANCH ?= $(shell basename $(DEPLOY_DIR))

# Base URL.
# This is set to $(DEPLOY_URL) when building.
BASE_URL ?= "$(HOST):$(PORT)"

# Sources

# Markdown sources.
MARKDOWN_INDICES = $(shell find -L $(FROM) -type f -name 'index.md')
MARKDOWN_READMES = $(shell find -L $(FROM) -type f -iname 'README.md')
MARKDOWN_REGULAR = $(shell find -L $(FROM) -type f -name '*.md' \
						   -not -name 'index.md' \
						   -not -iname 'README.md')

# Assets.
ATTACHMENTS = $(shell find -L $(FROM) -type f -not -name '*.md' -not -name '.*')
SITE_ASSETS = $(shell find -L $(WITH) -type f -not -name '.*')

# Targets

# Files to copy over.
VERBATIM  = $(patsubst $(FROM)/%,$(TO)/%,$(ATTACHMENTS))
VERBATIM += $(patsubst $(WITH)/%,$(TO)/%,$(SITE_ASSETS))

# HTML pages.
PAGES  = $(patsubst $(FROM)/%.md,$(TO)/%.html,$(MARKDOWN_INDICES))
PAGES += $(patsubst $(FROM)/%/README.md,$(TO)/%/index.html,$(MARKDOWN_READMES))
PAGES += $(patsubst $(FROM)/%.md,$(TO)/%/index.html,$(MARKDOWN_REGULAR))

# Recipes

all: draft

# Build targets incrementally.
draft: $(PAGES) $(VERBATIM)

# Preview the site.
preview: draft serve

# Deploy the site to the remote branch $(DEPLOY_BRANCH).
deploy: final commit push

# Prepare the deployable version of the site in $(DEPLOY_DIR).
final: clean-deploy-directory
	# Building deployable version...
	BASE_URL=$(DEPLOY_URL) TO=$(DEPLOY_DIR)/$(DEPLOY_PREFIX) make

# Prepare the deployable version of the site in $(DEPLOY_DIR)
# taking advantage of Make's incremental-compilation capabilities.
final-incrementally:
	# Build deployable version incrementally...
	BASE_URL=$(DEPLOY_URL) TO=$(DEPLOY_DIR)/$(DEPLOY_PREFIX) make

commit:
	# Committing changes to the branch $(DEPLOY_BRANCH)...
	cd $(DEPLOY_DIR) && \
	git add --all && \
	git commit -m "Refresh" || true

push:
	# Pushing changes to the remote branch $(DEPLOY_BRANCH)...
	git push origin $(DEPLOY_BRANCH)

pull:
	# Pulling changes from external content repositories...
	git submodule update --remote --rebase -- $(EXTERNAL)
	# Committing changes (if any)...
	git commit -m 'Update external content' -- $(EXTERNAL) || true

init:
	# Creating missing directories...
	mkdir -p $(FROM) $(TO) $(WITH)
	# Setting things up for deployment...
	bin/setup-deploy $(DEPLOY_BRANCH) $(DEPLOY_DIR)
	# Telling git to ignore the build directory...
	bin/ignore $(TO)

clean:
	# Cleaning $(TO)...
	rm -rf -- $(TO)

clean-deploy-directory:
	# Cleaning $(DEPLOY_DIR)...
	git worktree remove --force $(DEPLOY_DIR)
	git worktree add --no-checkout $(DEPLOY_DIR) $(DEPLOY_BRANCH)

# Local server.
PORT ?= 8080
HOST ?= "http://localhost"
SERVE ?= bin/server $(PORT) $(TO)

serve:
	# Serving $(TO) on port $(PORT)...
	$(SERVE)

# Rules

# Copy an asset as-is.
$(TO)/%: $(WITH)/%
	@ mkdir -p $(@D)
	cp $< $@

$(TO)/%: $(FROM)/%
	@ mkdir -p $(@D)
	cp $< $@

# Markdown

MARKDOWN_DEPS = templates/html.html \
                templates/header.html \
                templates/footer.html \
                bin/markdown \
                bin/title

# Render a regular Markdown node.
$(TO)/%/index.html: $(FROM)/%.md $(MARKDOWN_DEPS)
	@ mkdir -p $(@D)
	bin/markdown $< $@

# Render a Markdown leaf (index.md).
$(TO)/%.html: $(FROM)/%.md $(MARKDOWN_DEPS)
	@ mkdir -p $(@D)
	bin/markdown $< $@
# Special case for READMEs (README.md -> index.md -> index.html).
$(TO)/%/index.html: $(FROM)/%/README.md $(MARKDOWN_DEPS)
	@ mkdir -p $(@D)
	bin/markdown $< $@