SRC ?= haskelltut

ODIR ?= .

BIBLIOGRAPHY ?= bibliography
ALLSRC = $(shell find .)

SOELIM_OPTS ?=
SOELIM = soelim $(SOELIM_OPTS)

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

EQN_OPTS ?= -Tpdf
EQN = eqn $(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 ';'
#
GH_INTRO := .b1;.nr DI 0;.DS I;.fam C
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 = ./bin/ghighlight $(GHIGHLIGHT_OPTS)

GRAP_OPTS ?=
GRAP = grap $(GRAP_OPTS)

PIC_OPTS ?= -Tpdf
PIC = pic $(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)
REFER = refer $(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
GROFF_OPTS ?= -ms -t -Tpdf -U -mspdf -mpdfmark -M ./bin -P -e
GROFF = groff $(GROFF_OPTS)

$(SRC).pdf:
	$(SOELIM) < $(SRC).ms |\
		$(PRECONV) |\
		$(EQN) |\
		$(GHIGHLIGHT) |\
		$(GRAP) |\
		$(PIC) |\
		$(REFER) |\
		$(GROFF) > $(ODIR)/$@

# 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 . -name "*.ms" -or -name "*.d" | entr gmake -B $(SRC).pdf