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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)