# where to install
PREFIX ?= /usr/local
libdir := $(PREFIX)/lib
includedir := $(PREFIX)/include
bindir := $(PREFIX)/bin
mandir := $(PREFIX)/man/man1

objects := osl.o util.o rbtree.o sha1.o
fsck_objects := fsck.o osl.o util.o rbtree.o sha1.o oslfsck.lsg.o
deps := $(sort $(objects:.o=.d) $(fsck_objects:.o=.d))
headers := osl.h
executables := oslfsck
man_pages := oslfsck.1

INSTALL := install
ifeq "$(origin CC)" "default"
        CC := cc
endif
MKDIR := mkdir -p
RM := rm -f
LN := ln
LD := ld
OBJCOPY := objcopy

# libosl's versioning consists of three numbers. Let's call them x, y and z.
x := 0
y := 1
z := 3
VERSION := $(x).$(y).$(z)

OSL_CPPFLAGS += -DOSL_VERSION='"$(VERSION)"'

OSL_CFLAGS += -Wno-sign-compare -g -Wunused -Wundef -W
OSL_CFLAGS += -Wredundant-decls
OSL_CFLAGS += -Os
OSL_CFLAGS += -Wall
OSL_CFLAGS += -Wuninitialized
OSL_CFLAGS += -Wchar-subscripts
OSL_CFLAGS += -Wformat-security
OSL_CFLAGS += -Werror-implicit-function-declaration
OSL_CFLAGS += -Wmissing-format-attribute
OSL_CFLAGS += -Wunused-macros
OSL_CFLAGS += -Wbad-function-cast
OSL_CFLAGS += -fPIC
OSL_CFLAGS += -fvisibility=hidden

OSL_LDFLAGS += -Wl,-soname,$(soname)
OSL_LDFLAGS += -Wl,-z,defs
OSL_LDFLAGS += --shared

# On ELf-based systems, the following conventions apply (see dhweeler's
# Program Library HOWTO):
#
# The soname has the prefix ``lib'', the name of the library, the
# phrase ``.so'', followed by a period and a version number that is
# incremented whenever the interface changes.
libname := osl
soname := lib$(libname).so.$(x)

# The real name adds to the soname a period, a minor number, another
# period, and the release number.
realname := $(soname).$(y).$(z)

# In addition, there's the name that the compiler uses when requesting
# a library, (I'll call it the ``linker name''), which is simply the
# soname without any version number.
linkername := lib$(libname).so

all: $(realname) $(executables) $(man_pages) $(headers)
shared: $(realname)

ifeq ($(findstring clean, $(MAKECMDGOALS)),)
-include $(deps)
endif

# List osl.h in the prerequisites to make sure we generate it before attempting
# to run the compiler. This matters only when the .d file does not exist.
%.o: %.c osl.h Makefile errtab.h
	$(CC) $(OSL_CPPFLAGS) $(CPPFLAGS) \
		-c -MMD -MF $(*F).d -MT $@ \
		$(OSL_CFLAGS) $(CFLAGS) $<

fsck.o: oslfsck.lsg.h
oslfsck: $(fsck_objects)
	$(CC) -o $@ $(fsck_objects) $(LDFLAGS) -llopsub

%.lsg.c: %.suite
	lopsubgen --gen-c < $<

%.lsg.h: %.suite
	lopsubgen --gen-header < $<

%.1: %.suite
	lopsubgen --gen-man=$@ < $<

$(realname): $(objects)
	$(CC) $(OSL_LDFLAGS) $(LDFLAGS) -o $@ $(objects)

errtab.h: errlist
	sed -e 's/^\([A-Z_]*\)\s*\(.*\)/OSL_ERROR(E_OSL_\1, \2)/g' $< > $@

osl.h: osl.h.in errlist Makefile
	echo '#ifndef _OSL_H' > $@
	echo '#define _OSL_H' >> $@
	cat osl.h.in >> $@
	echo '/** public error codes of the osl library. */' >> $@
	sed -e 's/\([A-Z_]*\)	.*/	E_OSL_\1/' \
		-e '1s/^/enum osl_errors {/1' \
		-e '1s/$$/=1/1' \
		-e '$$!s/$$/,/g' \
		-e '$$s/$$/};/1' errlist >> $@
	echo '#endif /* _OSL_H */' >> $@
clean:
	rm -f *.o $(realname) osl.h errtab.h oslfsck *.lsg.* *.d

distclean: clean
	rm -f web/index.html web/oslfsck.1.html web/osl.png
	rm -rf web/doxygen

install-bin: $(executables)
	$(MKDIR) $(bindir)
	$(INSTALL) -m 755 $(executables) $(bindir)

install-man: $(man_pages)
	$(MKDIR) $(mandir)
	$(INSTALL) -m 644 $(man_pages) $(mandir)

install-lib: $(realname) $(headers)
	$(MKDIR) $(libdir) $(includedir)
	$(RM) $(libdir)/$(linkername)
	$(LN) -s $(soname) $(libdir)/$(linkername)
	$(INSTALL) -m 755 $(realname) $(libdir)
	$(INSTALL) -m 644 $(headers) $(includedir)

install: all install-bin install-man install-lib
www: web/index.html web/osl.png web/doxygen/index.html

.PHONY: all shared clean install install-bin install-man install-lib www

web/osl.png: web/osl.pdf Makefile
	convert -scale 200x200 $< $@

web/index.html: oslfsck.1 web/index.html.in INSTALL README
	sed -e '/@README@/,$$d' web/index.html.in > $@
	markdown < README >> $@
	sed -e '1,/@README@/d' -e '/@INSTALL@/,$$d' web/index.html.in >> $@
	markdown < INSTALL >> $@
	sed -e '1,/@INSTALL@/d' -e '/@MAN_PAGE@/,$$d' web/index.html.in >> $@
	groff -m man -Thtml -P -l oslfsck.1 | sed -e '1,/^<body>/d; /^<\/body>/,$$d' >> $@
	sed -e '1,/@MAN_PAGE@/d' web/index.html.in >> $@

web/doxygen/index.html: $(wildcard *.c *.h) web/Doxyfile web/header.html \
		web/footer.html
	doxygen web/Doxyfile