# Author: Fan, Chun-wei
# Common autotools file for constructing the g-ir-scanner and
# g-ir-compiler command lines for Visual Studio builds.

# This is copied from $(srcroot)/build from the gobject-introspection
# project, which may be included in projects that support both
# Visual Studio builds and introspection.

# * Input variables:
#
#   MSVC_INTROSPECT_GIRS - List of .gir's that should be built
#                          in the NMake Makefiles
#
# * Simple tutorial
#
# Add this to Makefile.am where your library/program is built:
#   (Either YourLib_1_0_gir_MSVC_LIBS or YourLib_1_0_gir_MSVC_PROGRAM
#    is required unless --headers-only is specified in
#    YourLib_1_0_gir__MSVC_SCANNERFLAGS)
#
#   include $(top_srcdir)/build/Makefile.msvc-introspection
#   MSVC_INTROSPECT_GIRS = YourLib-1.0.gir
#   YourLib_1_0_gir_NAMESPACE = YourLib # This is optional
#   YourLib_1_0_gir_VERSION = 1.0 # This is optional
#   YourLib_1_0_gir_MSVC_LIBS = yourlib-1.0
#   YourLib_1_0_gir_MSVC_FILES = $(libyourlib_1_0_SOURCES)
#   YourLib_1_0_gir_MSVC_PROGRAM = YourProgram
#   YourLib_1_0_gir_MSVC_PACKAGES = (Dependent .pc files)
#   YourLib_1_0_gir_MSVC_INCLUDE_GIRS = (Dependent external .gir's)
#   YourLiv_1_0_gir_MSVC_EXPORT_PACKAGES = (Packages exported by this .gir)

# Private functions

## Transform the MSVC project filename (no filename extensions) to something which can reference through a variable
## without automake/make complaining, eg Gtk-2.0 -> Gtk_2_0
_gir_name=$(subst /,_,$(subst -,_,$(subst .,_,$(1))))

# Namespace and Version is either fetched from the gir filename
# or the _NAMESPACE/_VERSION variable combo
_gir_namespace_msvc = $(or $($(_gir_name)_NAMESPACE),$(firstword $(subst -, ,$(notdir $(1)))))
_gir_version_msvc = $(or $($(_gir_name)_VERSION),$(lastword $(subst -, ,$(1:.gir=))))
_typelib_basename_msvc = $(_gir_namespace_msvc)'-'$(_gir_version_msvc)

# _PROGRAM is an optional variable which needs its own --program argument
_gir_program_msvc = $(if $($(_gir_name)_MSVC_PROGRAM),--program=$($(_gir_name)_MSVC_PROGRAM))

# Deduce the sub-folder from $(srcroot) where the sources reside in
_gir_source_path_raw_msvc:=$(subst $(abs_top_srcdir),,$(abs_srcdir))
_gir_source_path_msvc=$(subst /,\\,$(_gir_source_path_raw_msvc))
_gir_source_subdir_int_msvc=$(subst \\\\,\\,\\$(_gir_source_path_msvc)\\)
_gir_source_subdir_msvc=$(subst \\.\\,\\,$(_gir_source_subdir_int_msvc))

_gir_files_raw_msvc=$(subst /,\\,$($(_gir_name)_MSVC_FILES))
_gir_files_msvc=$(subst $(srcdir)\\,,$(subst $(builddir)\\,,$(subst $(top_builddir)\\$(_gir_source_path_msvc)\\,\\,$(_gir_files_raw_msvc))))

# Create a list of items for:
# - Libraries
# - Packages
# - GIRs to include
# - packages to export

_gir_libraries_msvc = $(foreach lib,$($(_gir_name)_MSVC_LIBS),--library=$(lib))
_gir_packages_msvc = $(foreach pkg,$($(_gir_name)_MSVC_PACKAGES),--pkg=$(pkg))
_gir_includes_msvc = $(foreach include,$($(_gir_name)_MSVC_INCLUDE_GIRS),--include=$(include))
_gir_export_packages_msvc = $(foreach pkg,$($(_gir_name)_MSVC_EXPORT_PACKAGES),--pkg-export=$(pkg))

#
# Create NMake Makefile Sections for Building Introspection files
# from autotools files
# $(1) - File Name of the .gir that is to be generated
#

define gir-nmake-builder

# Basic sanity check, to make sure required variables are set
$(if $($(_gir_name)_MSVC_FILES),,$(error Need to define $(_gir_name)_MSVC_FILES))
$(if $(or $(findstring --header-only,$($(_gir_name)_MSVC_SCANNERFLAGS)),
          $($(_gir_name)_MSVC_LIBS),
          $($(_gir_name)_MSVC_PROGRAM)),,
    $(error Need to define $(_gir_name)_MSVC_LIBS or $(_gir_name)_MSVC_PROGRAM))

$(top_builddir)/build/win32/$(_gir_name)_list:
	for F in $(_gir_files_msvc); do \
		case $$$$F in \
		*.c|*.cpp|*.cc|*.cxx|*.h|*.hpp|*.hh|*.hxx) \
			echo '..\..'$(_gir_source_subdir_msvc)$$$$F >>$(top_builddir)/build/win32/$(_gir_name)_list \
			;; \
		esac; \
	done

$(top_builddir)/build/win32/$(1).msvc.introspect:
	-$(RM) $(top_builddir)/build/win32/$(1).msvc.introspect

# Assemble the Command to Run g-ir-scanner
	echo $(1)': '$(_gir_name)'_list '$($(_gir_name)_MSVC_GIR_DEPS)>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	@-echo Generating $$$$@...'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	$$$$(PYTHON) $$$$(G_IR_SCANNER)	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	--verbose -no-libtool	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	--namespace='$(_gir_namespace_msvc)'	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	--nsversion='$(_gir_version_msvc)'	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	'$(_gir_packages_msvc)'	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	'$(_gir_libraries_msvc)'	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	'$(_gir_program_msvc)'	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	--add-include-path=$$$$(G_IR_INCLUDEDIR)	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	'$(_gir_includes_msvc)'	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	'$(_gir_export_packages_msvc)'	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	--cflags-begin	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	'$($(_gir_name)_MSVC_CFLAGS)'	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	--cflags-end	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	'$($(_gir_name)_MSVC_SCANNERFLAGS)'	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	--filelist='$(_gir_name)'_list	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	-o $$$$@'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '' >>$(top_builddir)/build/win32/$(1).msvc.introspect

# Finally Assemble the Command to Compile the generated .gir
	echo '$(_typelib_basename_msvc).typelib: '$(_typelib_basename_msvc)'.gir'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	@-echo Compiling $$$$@...'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	$$$$(G_IR_COMPILER)	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	--includedir=. --debug --verbose	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	'$(1)'	\'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '	-o $$$$@'>>$(top_builddir)/build/win32/$(1).msvc.introspect
	echo '' >>$(top_builddir)/build/win32/$(1).msvc.introspect
endef

$(foreach gir,$(MSVC_INTROSPECT_GIRS),$(eval $(call gir-nmake-builder,$(gir))))