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+##
+# Compile vala files to their c equivalents for further processing.
+#
+# The "vala_precompile" function takes care of calling the valac executable on
+# the given source to produce c files which can then be processed further using
+# default cmake functions.
+#
+# The first parameter provided is a variable, which will be filled with a list
+# of c files outputted by the vala compiler. This list can than be used in
+# conjuction with functions like "add_executable" or others to create the
+# neccessary compile rules with CMake.
+#
+# The following sections may be specified afterwards to provide certain options
+# to the vala compiler:
+#
+# SOURCES
+# A list of .vala files to be compiled. Please take care to add every vala
+# file belonging to the currently compiled project or library as Vala will
+# otherwise not be able to resolve all dependencies.
+#
+# PACKAGES
+# A list of vala packages/libraries to be used during the compile cycle. The
+# package names are exactly the same, as they would be passed to the valac
+# "--pkg=" option.
+#
+# OPTIONS
+# A list of optional options to be passed to the valac executable. This can be
+# used to pass "--thread" for example to enable multi-threading support.
+#
+# DEFINITIONS
+# A list of symbols to be used for conditional compilation. They are the same
+# as they would be passed using the valac "--define=" option.
+#
+# CUSTOM_VAPIS
+# A list of custom vapi files to be included for compilation. This can be
+# useful to include freshly created vala libraries without having to install
+# them in the system.
+#
+# GENERATE_VAPI
+# Pass all the needed flags to the compiler to create a vapi for
+# the compiled library. The provided name will be used for this and a
+# <provided_name>.vapi file will be created.
+#
+# GENERATE_HEADER
+# Let the compiler generate a header file for the compiled code. There will
+# be a header file as well as an internal header file being generated called
+# <provided_name>.h and <provided_name>_internal.h
+#
+# The following call is a simple example to the vala_precompile macro showing
+# an example to every of the optional sections:
+#
+# find_package(Vala "0.12" REQUIRED)
+# include(${VALA_USE_FILE})
+#
+# vala_precompile(VALA_C
+# SOURCES
+# source1.vala
+# source2.vala
+# source3.vala
+# PACKAGES
+# gtk+-2.0
+# gio-1.0
+# posix
+# DIRECTORY
+# gen
+# OPTIONS
+# --thread
+# CUSTOM_VAPIS
+# some_vapi.vapi
+# GENERATE_VAPI
+# myvapi
+# GENERATE_HEADER
+# myheader
+# )
+#
+# Most important is the variable VALA_C which will contain all the generated c
+# file names after the call.
+##
+
+##
+# Copyright 2009-2010 Jakob Westhoff. All rights reserved.
+# Copyright 2010-2011 Daniel Pfeifer
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+# this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY JAKOB WESTHOFF ``AS IS'' AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+# EVENT SHALL JAKOB WESTHOFF OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# The views and conclusions contained in the software and documentation are those
+# of the authors and should not be interpreted as representing official policies,
+# either expressed or implied, of Jakob Westhoff
+##
+
+include(CMakeParseArguments)
+
+function(_vala_mkdir_for_file file)
+ get_filename_component(dir "${file}" DIRECTORY)
+ file(MAKE_DIRECTORY "${dir}")
+endfunction()
+
+function(vala_precompile output)
+ cmake_parse_arguments(ARGS "" "DIRECTORY;GENERATE_HEADER;GENERATE_VAPI"
+ "SOURCES;PACKAGES;OPTIONS;DEFINITIONS;CUSTOM_VAPIS;GRESOURCES" ${ARGN})
+
+ if(ARGS_DIRECTORY)
+ get_filename_component(DIRECTORY ${ARGS_DIRECTORY} ABSOLUTE)
+ else(ARGS_DIRECTORY)
+ set(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+ endif(ARGS_DIRECTORY)
+ include_directories(${DIRECTORY})
+
+ set(vala_pkg_opts "")
+ foreach(pkg ${ARGS_PACKAGES})
+ list(APPEND vala_pkg_opts "--pkg=${pkg}")
+ endforeach(pkg ${ARGS_PACKAGES})
+
+ set(vala_define_opts "")
+ foreach(def ${ARGS_DEFINTIONS})
+ list(APPEND vala_define_opts "--define=${def}")
+ endforeach(def ${ARGS_DEFINTIONS})
+
+ set(custom_vapi_arguments "")
+ if(ARGS_CUSTOM_VAPIS)
+ foreach(vapi ${ARGS_CUSTOM_VAPIS})
+ if(${vapi} MATCHES ${CMAKE_SOURCE_DIR} OR ${vapi} MATCHES ${CMAKE_BINARY_DIR})
+ list(APPEND custom_vapi_arguments ${vapi})
+ else (${vapi} MATCHES ${CMAKE_SOURCE_DIR} OR ${vapi} MATCHES ${CMAKE_BINARY_DIR})
+ list(APPEND custom_vapi_arguments ${CMAKE_CURRENT_SOURCE_DIR}/${vapi})
+ endif(${vapi} MATCHES ${CMAKE_SOURCE_DIR} OR ${vapi} MATCHES ${CMAKE_BINARY_DIR})
+ endforeach(vapi ${ARGS_CUSTOM_VAPIS})
+ endif(ARGS_CUSTOM_VAPIS)
+
+ set(gresources_args "")
+ if(ARGS_GRESOURCES)
+ set(gresources_args --gresources "${ARGS_GRESOURCES}")
+ endif(ARGS_GRESOURCES)
+
+ set(in_files "")
+ set(fast_vapi_files "")
+ set(out_files "")
+ set(out_extra_files "")
+
+ set(vapi_arguments "")
+ if(ARGS_GENERATE_VAPI)
+ list(APPEND out_extra_files "${DIRECTORY}/${ARGS_GENERATE_VAPI}.vapi")
+ set(vapi_arguments "--internal-vapi=${ARGS_GENERATE_VAPI}.vapi")
+
+ # Header and internal header is needed to generate internal vapi
+ if (NOT ARGS_GENERATE_HEADER)
+ set(ARGS_GENERATE_HEADER ${ARGS_GENERATE_VAPI})
+ endif(NOT ARGS_GENERATE_HEADER)
+ endif(ARGS_GENERATE_VAPI)
+
+ set(header_arguments "")
+ if(ARGS_GENERATE_HEADER)
+ list(APPEND out_extra_files "${DIRECTORY}/${ARGS_GENERATE_HEADER}.h")
+ list(APPEND out_extra_files "${DIRECTORY}/${ARGS_GENERATE_HEADER}_internal.h")
+ list(APPEND header_arguments "--header=${DIRECTORY}/${ARGS_GENERATE_HEADER}.h")
+ list(APPEND header_arguments "--internal-header=${DIRECTORY}/${ARGS_GENERATE_HEADER}_internal.h")
+ endif(ARGS_GENERATE_HEADER)
+
+ foreach(src ${ARGS_SOURCES} ${ARGS_UNPARSED_ARGUMENTS})
+ set(in_file "${CMAKE_CURRENT_SOURCE_DIR}/${src}")
+ list(APPEND in_files "${in_file}")
+ string(REPLACE ".vala" ".c" src ${src})
+ string(REPLACE ".gs" ".c" src ${src})
+ string(REPLACE ".c" ".vapi" fast_vapi ${src})
+ set(fast_vapi_file "${DIRECTORY}/${fast_vapi}")
+ list(APPEND fast_vapi_files "${fast_vapi_file}")
+ list(APPEND out_files "${DIRECTORY}/${src}")
+
+ _vala_mkdir_for_file("${fast_vapi_file}")
+
+ add_custom_command(OUTPUT ${fast_vapi_file}
+ COMMAND
+ ${VALA_EXECUTABLE}
+ ARGS
+ --fast-vapi ${fast_vapi_file}
+ ${ARGS_OPTIONS}
+ ${in_file}
+ DEPENDS
+ ${in_file}
+ COMMENT
+ "Generating fast VAPI ${fast_vapi}"
+ )
+ endforeach(src ${ARGS_SOURCES} ${ARGS_UNPARSED_ARGUMENTS})
+
+ foreach(src ${ARGS_SOURCES} ${ARGS_UNPARSED_ARGUMENTS})
+ set(in_file "${CMAKE_CURRENT_SOURCE_DIR}/${src}")
+ string(REPLACE ".vala" ".c" c_code ${src})
+ string(REPLACE ".gs" ".c" c_code ${c_code})
+ string(REPLACE ".c" ".vapi" fast_vapi ${c_code})
+ set(my_fast_vapi_file "${DIRECTORY}/${fast_vapi}")
+ set(c_code_file "${DIRECTORY}/${c_code}")
+ set(fast_vapi_flags "")
+ set(fast_vapi_stamp "")
+ foreach(fast_vapi_file ${fast_vapi_files})
+ if(NOT "${fast_vapi_file}" STREQUAL "${my_fast_vapi_file}")
+ list(APPEND fast_vapi_flags --use-fast-vapi "${fast_vapi_file}")
+ list(APPEND fast_vapi_stamp "${fast_vapi_file}")
+ endif()
+ endforeach(fast_vapi_file)
+
+ _vala_mkdir_for_file("${fast_vapi_file}")
+ get_filename_component(dir "${c_code_file}" DIRECTORY)
+
+ add_custom_command(OUTPUT ${c_code_file}
+ COMMAND
+ ${VALA_EXECUTABLE}
+ ARGS
+ "-C"
+ "-d" ${dir}
+ ${vala_pkg_opts}
+ ${vala_define_opts}
+ ${gresources_args}
+ ${ARGS_OPTIONS}
+ ${fast_vapi_flags}
+ ${in_file}
+ ${custom_vapi_arguments}
+ DEPENDS
+ ${fast_vapi_stamp}
+ ${in_file}
+ ${ARGS_CUSTOM_VAPIS}
+ ${ARGS_GRESOURCES}
+ COMMENT
+ "Generating C source ${c_code}"
+ )
+ endforeach(src)
+
+ if(NOT "${out_extra_files}" STREQUAL "")
+ add_custom_command(OUTPUT ${out_extra_files}
+ COMMAND
+ ${VALA_EXECUTABLE}
+ ARGS
+ -C -q --disable-warnings
+ ${header_arguments}
+ ${vapi_arguments}
+ "-b" ${CMAKE_CURRENT_SOURCE_DIR}
+ "-d" ${DIRECTORY}
+ ${vala_pkg_opts}
+ ${vala_define_opts}
+ ${gresources_args}
+ ${ARGS_OPTIONS}
+ ${in_files}
+ ${custom_vapi_arguments}
+ DEPENDS
+ ${in_files}
+ ${ARGS_CUSTOM_VAPIS}
+ ${ARGS_GRESOURCES}
+ COMMENT
+ "Generating VAPI and headers for linking"
+ )
+ endif()
+ set(${output} ${out_files} PARENT_SCOPE)
+endfunction(vala_precompile)