BUG: add gettext module for working with GNU gettext (#4081)

Alex

Modules/FindGettext.cmake

@@ -0,0 +1,65 @@
+# - Find GNU gettext tools
+# This module looks for the GNU gettext tools. This module defines the 
+# following values:
+#  GETTEXT_MSGMERGE_EXECUTABLE: the full path to the msgmerge tool.
+#  GETTEXT_MSGFMT_EXECUTABLE: the full path to the msgfmt tool.
+#  GETTEXT_FOUND: True if gettext has been found.
+#
+# Additionally it provides the following macros:
+# GETTEXT_CREATE_TRANSLATIONS ( outputFile [ALL] file1 ... fileN )
+#    This will create a target "translations" which will convert the 
+#    given input po files into the binary output mo file. If the 
+#    ALL option is used, the translations will also be created when
+#    building the default target.
+
+
+
+FIND_PROGRAM(GETTEXT_MSGMERGE_EXECUTABLE msgmerge)
+
+FIND_PROGRAM(GETTEXT_MSGFMT_EXECUTABLE msgfmt)
+
+MACRO(GETTEXT_CREATE_TRANSLATIONS _potFile _firstPoFile)
+
+   SET(_gmoFiles)
+   GET_FILENAME_COMPONENT(_potBasename ${_potFile} NAME_WE)
+   GET_FILENAME_COMPONENT(_absPotFile ${_potFile} ABSOLUTE)
+
+   SET(_addToAll)
+   IF(${_firstPoFile} STREQUAL "ALL")
+      SET(_addToAll "ALL")
+      SET(_firstPoFile)
+   ENDIF(${_firstPoFile} STREQUAL "ALL")
+
+   FOREACH (_currentPoFile ${ARGN})
+      GET_FILENAME_COMPONENT(_absFile ${_currentPoFile} ABSOLUTE)
+      GET_FILENAME_COMPONENT(_abs_PATH ${_absFile} PATH)
+      GET_FILENAME_COMPONENT(_lang ${_absFile} NAME_WE)
+      SET(_gmoFile ${CMAKE_CURRENT_BINARY_DIR}/${_lang}.gmo)
+
+      ADD_CUSTOM_COMMAND( 
+         OUTPUT ${_gmoFile} 
+         COMMAND ${GETTEXT_MSGMERGE_EXECUTABLE} --quiet --update --backup=none -s ${_absFile} ${_absPotFile}
+         COMMAND ${GETTEXT_MSGFMT_EXECUTABLE} -o ${_gmoFile} ${_absFile}
+         DEPENDS ${_absPotFile} ${_absFile} 
+      )
+
+      INSTALL(FILES ${_gmoFile} DESTINATION share/locale/${_lang}/LC_MESSAGES RENAME ${_potBaseName}.mo) 
+      SET(_gmoFiles ${_gmoFiles} ${_gmoFile})
+
+   ENDFOREACH (_currentPoFile )
+
+   ADD_CUSTOM_TARGET(translations ${_addToAll} DEPENDS ${_gmoFiles})
+
+ENDMACRO(GETTEXT_CREATE_TRANSLATIONS )
+
+IF (GETTEXT_MSGMERGE_EXECUTABLE AND GETTEXT_MSGFMT_EXECUTABLE )
+   SET(GETTEXT_FOUND TRUE)
+ELSE (GETTEXT_MSGMERGE_EXECUTABLE AND GETTEXT_MSGFMT_EXECUTABLE )
+   SET(GETTEXT_FOUND FALSE)
+   IF (GetText_REQUIRED)
+      MESSAGE(FATAL_ERROR "GetText not found")
+   ENDIF (GetText_REQUIRED)
+ENDIF (GETTEXT_MSGMERGE_EXECUTABLE AND GETTEXT_MSGFMT_EXECUTABLE )
+
+
+