# Tab characters are invisible evil. Use a different prefix in recipes.
.RECIPEPREFIX = >

# The operator ‘!=’ is not negation; it executes a shell script and sets a variable to its output.
STATIC_ADOC_FILES != find source -name '*.adoc'
GENERATED_ADOC_FILES != find source -name '*.adoc0' | sed 's/\.adoc0/-generated.adoc/'
ADOC_FILES = $(STATIC_ADOC_FILES) $(GENERATED_ADOC_FILES)
DATE != date +%F
TIME != date +"%T %Z"

MAIN_ADOC_FILE = source/book.adoc
HTML_FILE = index.html
PDF_FILE = wombats-book-of-nix.pdf
EPUB_FILE = wombats-book-of-nix.epub

ADOC_ATTR_DATE = -a docdate="$(DATE)" -a doctime="$(TIME)"
ADOC_ATTR_AUTHORS = -a authors="Amy de Buitléir"
ADOC_ATTRIBUTES = $(ADOC_ATTR_DATE) $(ADOC_ATTR_AUTHORS)
ADOC_HTML_ATTRIBUTES = -a stylesheet=../themes/html.css -a imagesdir=images
ADOC_PDF_ATTRIBUTES = -a pdf-themesdir=themes -a pdf-theme=pdf -a imagesdir=../images
ADOC_EPUB_ATTRIBUTES = $(ADOC_HTML_ATTRIBUTES)

.PHONY: debug
debug :
> @echo "STATIC_ADOC_FILES=$(STATIC_ADOC_FILES)"
> @echo "GENERATED_ADOC_FILES=$(GENERATED_ADOC_FILES)"
> @echo "ADOC_FILES=$(ADOC_FILES)"

.PHONY: all
all : html pdf

.PHONY: html
html : $(HTML_FILE)

.PHONY: pdf
pdf : $(PDF_FILE)

.PHONY: epub
epub : $(EPUB_FILE)

# Files with the "adoc0" extension contain code that must be executed and included in order to generate asciidoc files.
# My "run-code-inline" script is available at https://github.com/mhwombat/bin/blob/master/run-code-inline.
# We want to treat any paths in commands as relative to the adoc0 file, so we cd to its directory.
# The "dir" and "notdir" functions extract the directory and base filename from a path, respectively.
%-generated.adoc : %.adoc0
> cd $(dir $@); run-code-inline < $(notdir $<) 2>&1 | tee $(notdir $@)
> sed -i 's/\x0d\x1b.\x4b//g' $@
# The last line fixes some weird characters generated by some nix commands

$(HTML_FILE) : $(ADOC_FILES)
> asciidoctor -b html5 -d book $(ADOC_ATTRIBUTES) $(ADOC_HTML_ATTRIBUTES) -o $@ $(MAIN_ADOC_FILE)

$(PDF_FILE) : $(ADOC_FILES)
> asciidoctor-pdf -d book $(ADOC_ATTRIBUTES) $(ADOC_PDF_ATTRIBUTES) -o $@ $(MAIN_ADOC_FILE)

$(EPUB_FILE) : $(ADOC_FILES)
> asciidoctor-epub3 -d book $(ADOC_ATTRIBUTES) $(ADOC_EPUB_ATTRIBUTES) -o $@ $(MAIN_ADOC_FILE)

.PHONY: clean
clean :
> rm -rf $(HTML_FILE) $(PDF_FILE) $(EPUB_FILE)
> find source -name '*-generated.adoc' -delete

.PHONY: spellcheck
spellcheck :
> cat index.html | aspell --lang=en_IE --encoding=utf-8 --add-extra-dicts=./wordlist --mode=html list | sort -u

# dictionary/en_book.rws : wordlist
# > aspell --lang=en create master ./$@ < $<