# Use tab to indent recipe lines, spaces to indent other lines, otherwise
# GNU make may get unhappy.

CC ?= gcc

PREFIX ?= /usr
BINDIR ?= $(PREFIX)/bin
MANDIR ?= $(PREFIX)/share/man/man1
APPDIR ?= $(PREFIX)/share/applications
ICODIR ?= $(PREFIX)/share/icons/hicolor/

PACKAGES = x11 xcomposite xfixes xdamage xrender xext xrandr
LIBS = -lm -lrt
INCS =

OBJS = compton.o config.o

# === Configuration flags ===
CFG = -std=c11 -D_GNU_SOURCE -Wall -Wextra -Wno-unused-parameter

ifeq "$(CC)" "clang"
  CFG += -Wconditional-uninitialized
endif

# ==== Xinerama ====
# Enables support for --xinerama-shadow-crop
ifeq "$(NO_XINERAMA)" ""
  CFG += -DCONFIG_XINERAMA
  PACKAGES += xinerama
endif

# ==== libconfig ====
# Enables configuration file parsing support
ifeq "$(NO_LIBCONFIG)" ""
  CFG += -DCONFIG_LIBCONFIG
  PACKAGES += libconfig
  OBJS += config_libconfig.o

  # libconfig-1.3* does not define LIBCONFIG_VER* macros, so we use
  # pkg-config to determine its version here
  LIBCONFIG_VER = $(shell pkg-config --atleast-version=1.4 libconfig; echo $$?)
  ifeq ($LIBCONFIG_VER, 1)
    $(error "Your libconfig is too old, at least 1.4 is required")
  endif
endif

# ==== PCRE regular expression ====
# Enables support for PCRE regular expression pattern in window conditions
ifeq "$(NO_REGEX_PCRE)" ""
  CFG += -DCONFIG_REGEX_PCRE
  LIBS += $(shell pcre-config --libs)
  INCS += $(shell pcre-config --cflags)
  # Enables JIT support in libpcre
  ifeq "$(NO_REGEX_PCRE_JIT)" ""
    CFG += -DCONFIG_REGEX_PCRE_JIT
  endif
endif

# ==== DRM VSync ====
# Enables support for "drm" VSync method
ifeq "$(NO_VSYNC_DRM)" ""
  INCS += $(shell pkg-config --cflags libdrm)
  CFG += -DCONFIG_VSYNC_DRM
endif

# ==== OpenGL ====
# Enables support for GLX backend, OpenGL VSync methods, etc.
ifneq "$(NO_VSYNC_OPENGL)" ""
  NO_OPENGL=$(NO_VSYNC_OPENGL)
endif
ifeq "$(NO_OPENGL)" ""
  CFG += -DCONFIG_OPENGL
  # -lGL must precede some other libraries, or it segfaults on FreeBSD (#74)
  LIBS := -lGL $(LIBS)
  OBJS += opengl.o
endif

# ==== D-Bus ====
# Enables support for --dbus (D-Bus remote control)
ifeq "$(NO_DBUS)" ""
  CFG += -DCONFIG_DBUS
  PACKAGES += dbus-1
  OBJS += dbus.o
endif

# ==== X Sync ====
# Enables support for --xrender-sync-fence
ifeq "$(NO_XSYNC)" ""
  CFG += -DCONFIG_XSYNC
endif

OBJS += c2.o

# ==== X resource checker ====
# Enable X resource leakage checking (Pixmap only, presently)
ifneq "$(ENABLE_XRESCHECK)" ""
  CFG += -DDEBUG_XRC
  OBJS += xrescheck.o
endif

# === Version string ===
COMPTON_VERSION ?= git-$(shell git describe --always --dirty)-$(shell git log -1 --date=short --pretty=format:%cd)
CFG += -DCOMPTON_VERSION="\"$(COMPTON_VERSION)\""

LDFLAGS ?= -Wl,-O1 -Wl,--as-needed

BUILD_TYPE ?= "Debug"

ifeq "$(BUILD_TYPE)" "Release"
  CFG += -DNDEBUG -O2 -D_FORTIFY_SOURCE=2
else ifeq "$(BUILD_TYPE)" "Debug"
  CFG += -ggdb -Wshadow
endif

ifeq "$(ENABLE_SAN)" "1"
  CFG += -fsanitize=address,undefined
else ifeq "$(ENABLE_SAN)" "thread"
  CFG += -fsanitize=thread
else ifeq "$(ENABLE_SAN)" "memory"
  CFG += -fsanitize=memory
endif

LIBS += $(shell pkg-config --libs $(PACKAGES))
INCS += $(shell pkg-config --cflags $(PACKAGES))

BINS = compton bin/compton-trans
MANPAGES = man/compton.1 man/compton-trans.1
MANPAGES_HTML = $(addsuffix .html,$(MANPAGES))

# === Recipes ===
.DEFAULT_GOAL := compton

src/.clang_complete: Makefile
	@(for i in $(filter-out -O% -DNDEBUG, $(CFG) $(CPPFLAGS) $(INCS)); do echo "$$i"; done) > $@

.deps:
	mkdir -p $@

.deps/%.d: src/%.c | .deps
	@set -e; rm -f $@; \
	  $(CC) -M $(CPPFLAGS) $< > $@.$$$$; \
	  sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \
	  rm -f $@.$$$$
%.o: src/%.c
	$(CC) $(CFG) $(CPPFLAGS) $(INCS) -c src/$*.c -o $@

compton: $(OBJS)
	$(CC) $(CFG) $(CPPFLAGS) $(LDFLAGS) -o $@ $(OBJS) $(LIBS)

man/%.1: man/%.1.asciidoc
	a2x --format manpage $<

man/%.1.html: man/%.1.asciidoc
	asciidoc $<

docs: $(MANPAGES) $(MANPAGES_HTML)

install: $(BINS) docs
	@install -d "$(DESTDIR)$(BINDIR)" "$(DESTDIR)$(MANDIR)" "$(DESTDIR)$(APPDIR)"
	@install -m755 $(BINS) "$(DESTDIR)$(BINDIR)"/
ifneq "$(MANPAGES)" ""
	@install -m644 $(MANPAGES) "$(DESTDIR)$(MANDIR)"/
endif
	@install -d \
		"$(DESTDIR)$(ICODIR)/scalable/apps" \
		"$(DESTDIR)$(ICODIR)/48x48/apps"
	@install -m644 media/compton.svg "$(DESTDIR)$(ICODIR)/scalable/apps"/
	@install -m644 media/icons/48x48/compton.png "$(DESTDIR)$(ICODIR)/48x48/apps"/
	@install -m644 compton.desktop "$(DESTDIR)$(APPDIR)"/
ifneq "$(DOCDIR)" ""
	@install -d "$(DESTDIR)$(DOCDIR)"
	@install -m644 README.md compton.sample.conf "$(DESTDIR)$(DOCDIR)"/
	@install -m755 dbus-examples/cdbus-driver.sh "$(DESTDIR)$(DOCDIR)"/
endif

uninstall:
	@rm -f "$(DESTDIR)$(BINDIR)/compton" "$(DESTDIR)$(BINDIR)/compton-trans"
	@rm -f $(addprefix "$(DESTDIR)$(MANDIR)"/, compton.1 compton-trans.1)
	@rm -f "$(DESTDIR)$(APPDIR)/compton.desktop"
ifneq "$(DOCDIR)" ""
	@rm -f $(addprefix "$(DESTDIR)$(DOCDIR)"/, README.md compton.sample.conf cdbus-driver.sh)
endif

clean:
	@rm -f $(OBJS) compton $(MANPAGES) $(MANPAGES_HTML) .clang_complete
	@rm -rf .deps

version:
	@echo "$(COMPTON_VERSION)"

.PHONY: uninstall clean docs version
include $(addprefix .deps/,$(OBJS:.o=.d))