# -*- mode: makefile-gmake -*-
##
## Netsurf library and feature macros
##

# A macro that conditionaly adds flags to the build when a feature is enabled.
#
# 1: Feature name (ie, NETSURF_USE_BMP -> BMP)
# 2: Parameters to add to CFLAGS
# 3: Parameters to add to LDFLAGS
# 4: Human-readable name for the feature
define feature_enabled
  ifeq ($$(NETSURF_USE_$(1)),YES)
    CFLAGS += $(2)
    CXXFLAGS += $(2)
    LDFLAGS += $(3)
    ifneq ($(MAKECMDGOALS),clean)
      $$(info M.CONFIG: $(4)	enabled       (NETSURF_USE_$(1) := YES))
    endif
  else ifeq ($$(NETSURF_USE_$(1)),NO)
    ifneq ($(MAKECMDGOALS),clean)
      $$(info M.CONFIG: $(4)	disabled      (NETSURF_USE_$(1) := NO))
    endif
  else
    $$(info M.CONFIG: $(4)	error         (NETSURF_USE_$(1) := $$(NETSURF_USE_$(1))))
    $$(error NETSURF_USE_$(1) must be YES or NO)
  endif
endef

# A macro that conditionaly adds flags to the build with a uniform display.
#
# 1: Feature name (ie, NETSURF_USE_BMP -> BMP)
# 2: Human-readable name for the feature
# 3: Parameters to add to CFLAGS when enabled
# 4: Parameters to add to LDFLAGS when enabled
# 5: Parameters to add to CFLAGS when disabled
# 6: Parameters to add to LDFLAGS when disabled
define feature_switch
  ifeq ($$(NETSURF_USE_$(1)),YES)
    CFLAGS += $(3)
    CXXFLAGS += $(3)
    LDFLAGS += $(4)
    ifneq ($(MAKECMDGOALS),clean)
      $$(info M.CONFIG: $(2)	enabled       (NETSURF_USE_$(1) := YES))
    endif
  else ifeq ($$(NETSURF_USE_$(1)),NO)
    CFLAGS += $(5)
    CXXFLAGS += $(5)
    LDFLAGS += $(6)
    ifneq ($(MAKECMDGOALS),clean)
      $$(info M.CONFIG: $(2)	disabled      (NETSURF_USE_$(1) := NO))
    endif
  else
    $$(info M.CONFIG: $(4)	error         (NETSURF_USE_$(1) := $$(NETSURF_USE_$(1))))
    $$(error NETSURF_USE_$(1) must be YES or NO)
  endif
endef

# Extend flags with appropriate values from pkg-config for enabled features
#
# 1: pkg-config required modules for feature
# 2: Human-readable name for the feature
define pkg_config_find_and_add
  ifeq ($$(PKG_CONFIG),)
    $$(error pkg-config is required to auto-detect feature availability)
  endif

  PKG_CONFIG_$(1)_EXISTS := $$(shell $$(PKG_CONFIG) --exists $(1) && echo yes)

  ifeq ($$(PKG_CONFIG_$(1)_EXISTS),yes)
      CFLAGS += $$(shell $$(PKG_CONFIG) --cflags $(1))
      CXXFLAGS += $$(shell $$(PKG_CONFIG) --cflags $(1))
      LDFLAGS += $$(shell $$(PKG_CONFIG) --libs $(1))
      ifneq ($(MAKECMDGOALS),clean)
        $$(info PKG.CNFG: $(2) ($(1))	enabled)
      endif
  else
    ifneq ($(MAKECMDGOALS),clean)
      $$(info PKG.CNFG: $(2) ($(1))	failed)
      $$(error Unable to find library for: $(2) ($(1)))
    endif
  endif
endef

# Extend flags with appropriate values from pkg-config for enabled features
#
# 1: Feature name (ie, NETSURF_USE_RSVG -> RSVG)
# 2: pkg-config required modules for feature
# 3: Human-readable name for the feature
define pkg_config_find_and_add_enabled
  ifeq ($$(PKG_CONFIG),)
    $$(error pkg-config is required to auto-detect feature availability)
  endif

  NETSURF_FEATURE_$(1)_AVAILABLE := $$(shell $$(PKG_CONFIG) --exists $(2) && echo yes)
  NETSURF_FEATURE_$(1)_CFLAGS ?= -DWITH_$(1)

  ifeq ($$(NETSURF_USE_$(1)),YES)
    ifeq ($$(NETSURF_FEATURE_$(1)_AVAILABLE),yes)
      CFLAGS += $$(shell $$(PKG_CONFIG) --cflags $(2)) $$(NETSURF_FEATURE_$(1)_CFLAGS)
      CXXFLAGS += $$(shell $$(PKG_CONFIG) --cflags $(2)) $$(NETSURF_FEATURE_$(1)_CFLAGS)
      LDFLAGS += $$(shell $$(PKG_CONFIG) --libs $(2)) $$(NETSURF_FEATURE_$(1)_LDFLAGS)
      ifneq ($(MAKECMDGOALS),clean)
        $$(info M.CONFIG: $(3) ($(2))	enabled       (NETSURF_USE_$(1) := YES))
      endif
    else
      ifneq ($(MAKECMDGOALS),clean)
        $$(info M.CONFIG: $(3) ($(2))	failed        (NETSURF_USE_$(1) := YES))
        $$(error Unable to find library for: $(3) ($(2)))
      endif
    endif
  else ifeq ($$(NETSURF_USE_$(1)),AUTO)
    ifeq ($$(NETSURF_FEATURE_$(1)_AVAILABLE),yes)
      CFLAGS += $$(shell $$(PKG_CONFIG) --cflags $(2)) $$(NETSURF_FEATURE_$(1)_CFLAGS)
      CXXFLAGS += $$(shell $$(PKG_CONFIG) --cflags $(2)) $$(NETSURF_FEATURE_$(1)_CFLAGS)
      LDFLAGS += $$(shell $$(PKG_CONFIG) --libs $(2)) $$(NETSURF_FEATURE_$(1)_LDFLAGS)
      ifneq ($(MAKECMDGOALS),clean)
        $$(info M.CONFIG: $(3) ($(2))	auto-enabled  (NETSURF_USE_$(1) := AUTO))
	NETSURF_USE_$(1) := YES
      endif
    else
      ifneq ($(MAKECMDGOALS),clean)
        $$(info M.CONFIG: $(3) ($(2))	auto-disabled (NETSURF_USE_$(1) := AUTO))
	NETSURF_USE_$(1) := NO
      endif
    endif
  else ifeq ($$(NETSURF_USE_$(1)),NO)
    ifneq ($(MAKECMDGOALS),clean)
      $$(info M.CONFIG: $(3) ($(2))	disabled      (NETSURF_USE_$(1) := NO))
    endif
  else
    ifneq ($(MAKECMDGOALS),clean)
      $$(info M.CONFIG: $(3) ($(2))	error         (NETSURF_USE_$(1) := $$(NETSURF_USE_$(1))))
      $$(error NETSURF_USE_$(1) must be YES, NO, or AUTO)
    endif
  endif
endef