Handle translations with CMakes.

closes #81

src/CMakeLists.txt

@@ -4,6 +4,8 @@ add_subdirectory(CBot)
 # Tools directory is built separately
 add_subdirectory(tools)
 
+add_subdirectory(po)
+
 # Tests
 if(${TESTS})
     add_subdirectory(common/test)

src/po/CMakeLists.txt

@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 2.8)
+
+SET(_potFile colobot.pot)
+
+# TODO: Use a finder
+SET(XGETTEXT_CMD /usr/bin/xgettext)
+
+find_package(Gettext REQUIRED)
+
+ADD_CUSTOM_COMMAND(OUTPUT ${_potFile}
+    COMMAND ${XGETTEXT_CMD} ../app/app.cpp --output=${_potFile}
+    COMMAND ${XGETTEXT_CMD} ../common/restext_strings.c --output=${_potFile} --join-existing --extract-all --no-location
+
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+    COMMENT "Extract translatable messages to ${_potFile}"
+)
+
+ADD_CUSTOM_TARGET(_${potFile} ${_all}
+DEPENDS ${_potFile}
+)
+
+FILE(GLOB _poFiles *.po)
+
+GETTEXT_CREATE_TRANSLATIONS(${_potFile} ALL ${_poFiles})