[CMake/glib] add support for gobject-introspection

other than a module to find (using pkg-config) gobject-introspection, this adds a macro (gir_add_introspections) to add new introspections in a directory.
its working is much similar (even the variable names used) to the Makefile version provided by gobject-repository itself, with the notable difference of a disabled libtool in the g-ir-scanner invocation.
the only additional step needed is adding two custom targets, compiled by ALL, which have the gir and the typelib files as dependencies, to make them build with the usual `make all'.

2 files changed, 155 insertions, 0 deletions

diff --git a/cmake/modules/FindGObjectIntrospection.cmake b/cmake/modules/FindGObjectIntrospection.cmake
new file mode 100644
index 00000000..2073c3cb
--- /dev/null
+++ b/cmake/modules/FindGObjectIntrospection.cmake
@@ -0,0 +1,61 @@
+# - try to find gobject-introspection
+#
+# Once done this will define
+#
+#  INTROSPECTION_FOUND - system has gobject-introspection
+#  INTROSPECTION_SCANNER - the gobject-introspection scanner, g-ir-scanner
+#  INTROSPECTION_COMPILER - the gobject-introspection compiler, g-ir-compiler
+#  INTROSPECTION_GENERATE - the gobject-introspection generate, g-ir-generate
+#  INTROSPECTION_GIRDIR
+#  INTROSPECTION_TYPELIBDIR
+#  INTROSPECTION_CFLAGS
+#  INTROSPECTION_LIBS
+#
+# Copyright (C) 2010, Pino Toscano, <pino@kde.org>
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+macro(_GIR_GET_PKGCONFIG_VAR _outvar _varname)
+  execute_process(
+    COMMAND ${PKG_CONFIG_EXECUTABLE} --variable=${_varname} gobject-introspection-1.0
+    OUTPUT_VARIABLE _result
+    RESULT_VARIABLE _null
+  )
+
+  if (_null)
+  else()
+    string(REGEX REPLACE "[\r\n]" " " _result "${_result}")
+    string(REGEX REPLACE " +$" ""  _result "${_result}")
+    separate_arguments(_result)
+    set(${_outvar} ${_result} CACHE INTERNAL "")
+  endif()
+endmacro(_GIR_GET_PKGCONFIG_VAR)
+
+find_package(PkgConfig)
+if(PKG_CONFIG_FOUND)
+  if(PACKAGE_FIND_VERSION_COUNT GREATER 0)
+    set(_gir_version_cmp ">=${PACKAGE_FIND_VERSION}")
+  endif()
+  pkg_check_modules(_pc_gir gobject-introspection-1.0${_gir_version_cmp})
+  if(_pc_gir_FOUND)
+    set(INTROSPECTION_FOUND TRUE)
+    _gir_get_pkgconfig_var(INTROSPECTION_SCANNER "g_ir_scanner")
+    _gir_get_pkgconfig_var(INTROSPECTION_COMPILER "g_ir_compiler")
+    _gir_get_pkgconfig_var(INTROSPECTION_GENERATE "g_ir_generate")
+    _gir_get_pkgconfig_var(INTROSPECTION_GIRDIR "girdir")
+    _gir_get_pkgconfig_var(INTROSPECTION_TYPELIBDIR "typelibdir")
+    set(INTROSPECTION_CFLAGS "${_pc_gir_CFLAGS}")
+    set(INTROSPECTION_LIBS "${_pc_gir_LIBS}")
+  endif()
+endif()
+
+mark_as_advanced(
+  INTROSPECTION_SCANNER
+  INTROSPECTION_COMPILER
+  INTROSPECTION_GENERATE
+  INTROSPECTION_GIRDIR
+  INTROSPECTION_TYPELIBDIR
+  INTROSPECTION_CFLAGS
+  INTROSPECTION_LIBS
+)
diff --git a/cmake/modules/GObjectIntrospectionMacros.cmake b/cmake/modules/GObjectIntrospectionMacros.cmake
new file mode 100644
index 00000000..e7d62a39
--- /dev/null
+++ b/cmake/modules/GObjectIntrospectionMacros.cmake
@@ -0,0 +1,94 @@
+# Copyright (C) 2010, Pino Toscano, <pino@kde.org>
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+macro(_gir_list_prefix _outvar _listvar _prefix)
+  set(${_outvar})
+  foreach(_item IN LISTS ${_listvar})
+    list(APPEND ${_outvar} ${_prefix}${_item})
+  endforeach()
+endmacro(_gir_list_prefix)
+
+macro(gir_add_introspections introspections_girs)
+
+  set(_gir_girs)
+  set(_gir_typelibs)
+
+  foreach(gir IN LISTS ${introspections_girs})
+
+    set(_gir_name "${gir}")
+
+    ## Transform the gir filename to something which can reference through a variable
+    ## without automake/make complaining, eg Gtk-2.0.gir -> Gtk_2_0_gir
+    string(REPLACE "-" "_" _gir_name "${_gir_name}")
+    string(REPLACE "." "_" _gir_name "${_gir_name}")
+
+    # Namespace and Version is either fetched from the gir filename
+    # or the _NAMESPACE/_VERSION variable combo
+    set(_gir_namespace "${${_gir_name}_NAMESPACE}")
+    if (_gir_namespace STREQUAL "")
+      string(REGEX REPLACE "([^-]+)-.*" "\\1" _gir_namespace "${gir}")
+    endif ()
+    set(_gir_version "${${_gir_name}_VERSION}")
+    if (_gir_version STREQUAL "")
+      string(REGEX REPLACE ".*-([^-]+).gir" "\\1" _gir_version "${gir}")
+    endif ()
+
+    # _PROGRAM is an optional variable which needs it's own --program argument
+    set(_gir_program "${${_gir_name}_PROGRAM}")
+    if (NOT _gir_program STREQUAL "")
+      set(_gir_program "--program=${_gir_program}")
+    endif ()
+
+    # Variables which provides a list of things
+    _gir_list_prefix(_gir_libraries ${_gir_name}_LIBS "--library=")
+    _gir_list_prefix(_gir_packages ${_gir_name}_PACKAGES "--pkg=")
+    _gir_list_prefix(_gir_includes ${_gir_name}_INCLUDES "--include=")
+
+    # Reuse the LIBTOOL variable from by automake if it's set
+    set(_gir_libtool "--no-libtool")
+
+    add_custom_command(
+      COMMAND ${INTROSPECTION_SCANNER}
+              ${INTROSPECTION_SCANNER_ARGS}
+              --namespace=${_gir_namespace}
+              --nsversion=${_gir_version}
+              ${_gir_libtool}
+              ${_gir_program}
+              ${_gir_libraries}
+              ${_gir_packages}
+              ${_gir_includes}
+              ${${_gir_name}_SCANNERFLAGS}
+              ${${_gir_name}_CFLAGS}
+              ${${_gir_name}_FILES}
+              --output ${CMAKE_CURRENT_BINARY_DIR}/${gir}
+      DEPENDS ${${_gir_name}_FILES}
+              ${${_gir_name}_LIBS}
+      OUTPUT ${gir}
+      WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+      VERBATIM
+    )
+    list(APPEND _gir_girs ${CMAKE_CURRENT_BINARY_DIR}/${gir})
+    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${gir} DESTINATION share/gir-1.0)
+
+    string(REPLACE ".gir" ".typelib" _typelib "${gir}")
+    add_custom_command(
+      COMMAND ${INTROSPECTION_COMPILER}
+              ${INTROSPECTION_COMPILER_ARGS}
+              --includedir=.
+              ${CMAKE_CURRENT_BINARY_DIR}/${gir}
+              -o ${CMAKE_CURRENT_BINARY_DIR}/${_typelib}
+      DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${gir}
+      OUTPUT ${_typelib}
+      WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+    )
+    list(APPEND _gir_typelibs ${CMAKE_CURRENT_BINARY_DIR}/${_typelib})
+    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${_typelib} DESTINATION lib${LIB_SUFFIX}/girepository-1.0)
+
+  endforeach()
+
+  add_custom_target(gir-girs ALL DEPENDS ${_gir_girs})
+  add_custom_target(gir-typelibs ALL DEPENDS ${_gir_typelibs})
+
+endmacro(gir_add_introspections)