SRC ?= haskelltut

# Let's allow different implementations to be tested.
BINPIC        ?= pic
BINREFER      ?= refer
BINSOELIM     ?= soelim
BINPRECONV    ?= preconv
BINEQN        ?= eqn
BINGHIGHLIGHT ?= ./bin/ghighlight
BINBUSGRAP    ?= ./bin/busgrap.pl
BINGRAP       ?= grap
BINROFF       ?= groff
export BINPIC BINREFER BINSOELIM BINPRECONV BINEQN BINGHIGHLIGHT BINBUSGRAP BINGRAP BINROFF

ODIR ?= .

BIBLIOGRAPHY ?= bibliography
BIBLIOGRAPHY_PROCESSED ?= /tmp/bib
ALLSRC = $(shell find . -name "*.ms")

SOELIM_OPTS ?=
SOELIM = $(BINSOELIM) $(SOELIM_OPTS)

# Custom script, currently to replace unbreakable spaces by \SP.
CUSTOM_OPTS ?=
CUSTOM ?= ./bin/custom $(CUSTOM_OPTS)

#CUSTOM_BIS_OPTS ?=
#CUSTOM_BIS ?= ./bin/utf8-to-ms.sh $(CUSTOM_BIS_OPTS)

PRECONV_OPTS ?= -e utf-8
PRECONV = $(BINPRECONV) $(PRECONV_OPTS)

EQN_OPTS ?= -Tpdf
EQN = $(BINEQN) $(EQN_OPTS)

# source-highlight stuff
# GH_INTRO: instructions before each source code provided by source-highlight
# GH_OUTRO: ------------ after  ---- ------ ---- -------- -- ----------------
# GH_INTRO/GH_OUTRO: values are separated by ';'
#
CODE_FONT_FAMILY ?= C
GH_INTRO := .b1;.nr DI 0;.DS I;.fam $(CODE_FONT_FAMILY)
GH_OUTRO := .fam;.DE;.b2
#
export GH_INTRO
export GH_OUTRO
#
# SHOPTS: cmd line parameter given to source-highlight
SHOPTS = --outlang-def=.source-highlight_groff-output-definition
export SHOPTS

# ghighlight brings `source-highlight` to troff
GHIGHLIGHT_OPTS ?=
GHIGHLIGHT = $(BINGHIGHLIGHT) $(GHIGHLIGHT_OPTS)

# BUSGRAP brings pie charts to troff
BUSGRAP_OPTS ?=
BUSGRAP = $(BINBUSGRAP) $(BUSGRAP_OPTS)

GRAP_OPTS ?=
GRAP = $(BINGRAP) $(GRAP_OPTS)

PIC_OPTS ?= -Tpdf
PIC = $(BINPIC) $(PIC_OPTS)

# -P      => move ponctuation after reference
# -S      => label and bracket-label options
# -e      => accumulate (use a reference section)
# -p bib  => bibliography file
REFER_OPTS ?= -PS -e -p $(BIBLIOGRAPHY_PROCESSED)
REFER = $(BINREFER) $(REFER_OPTS)

# -k     => iconv conversion (did it ever worked?)
# -ms    => ms macro
# -U     => unsafe (because of PDF inclusion)
# -Tpdf  => output device is PDF
# -mspdf => include PDF (so, images converted in PDF) in the document
# NOTE: a custom troffrc (configuration file) is necessary on OpenBSD
#       to have correctly justified paragraphs. Otherwise, the default
#       configuration removes this possibility, for bullshit reasons. Sad.
# -M dir => path to custom troffrc
# TODO: no change with or without the following options -P -e
#       This has to be inverstigated: how to make PDFs look nice in browsers?
# -P -e  => provide "-e" to gropdf to embed fonts
ROFF_OPTS ?= -ms -t -Tpdf -U -mspdf -mpdfmark -M ./bin -P -e
ROFF = $(BINROFF) $(ROFF_OPTS)

$(BIBLIOGRAPHY_PROCESSED): $(BIBLIOGRAPHY)
	@# Let's process the bibliography file
	@echo "Let's process the bibliography file"
	$(PRECONV) < $(BIBLIOGRAPHY) > $(BIBLIOGRAPHY_PROCESSED)

$(SRC).pdf: $(BIBLIOGRAPHY_PROCESSED)
	sleep 0.1
	$(SOELIM) < $(SRC).ms |\
		$(CUSTOM) |\
		$(BUSGRAP) |\
		$(PRECONV) |\
		$(REFER) |\
		$(EQN) |\
		$(GHIGHLIGHT) |\
		$(GRAP) |\
		$(PIC) |\
		$(PRECONV) |\
		$(ROFF) > $(ODIR)/$@

# Keep options in memory for the recursive 'make' call
export SOELIM_OPTS PRECONV_OPTS EQN_OPTS GHIGHLIGHT_OPTS GRAP_OPTS PIC_OPTS REFER_OPTS
serve:
	find . | entr gmake $(SRC).pdf