Add CMake find script for using ctemplate from CMake projects.

This is the FindCtemplate.cmake [email protected] posted
in issue OlafvdSpek#91. I did not change it in any way.

I did use it in a project of mine and it worked well.

contrib/FindCtemplate.cmake

@@ -0,0 +1,71 @@
+# - Try to find the ctemplate
+# Once done this will define
+#
+#  CTEMPLATE_FOUND - system has ctemplate
+#  CTEMPLATE_INCLUDE_DIR - the ctemplate include directory
+#  CTEMPLATE_LIBRARIES - Link this to use ctemplate
+#  CTEMPLATE_COMPILER - CTemplate compiler executable
+#
+#  CTEMPLATE_VARNAMES - Macro that wraps templates in varnames.h
+#     Usage: CTEMPLATE_VARNAMES(header1.h header2.h ${CT_FILES})
+#
+
+# Copyright (c) 2009, Thomas Richard, <[email protected]>
+# Copyright (c) 2012, Siemens <[email protected]>
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+if (CTEMPLATE_INCLUDE_DIR AND CTEMPLATE_LIBRARIES)
+  # in cache already
+  set(CTEMPLATE_FOUND TRUE)
+
+else (CTEMPLATE_INCLUDE_DIR AND CTEMPLATE_LIBRARIES)
+  find_path(CTEMPLATE_INCLUDE_DIR ctemplate/template.h)
+  find_library(CTEMPLATE_LIBRARIES NAMES ctemplate)
+  find_program(CTEMPLATE_COMPILER make_tpl_varnames_h)
+
+  include(FindPackageHandleStandardArgs)
+  FIND_PACKAGE_HANDLE_STANDARD_ARGS(Ctemplate DEFAULT_MSG CTEMPLATE_INCLUDE_DIR CTEMPLATE_LIBRARIES )
+
+endif (CTEMPLATE_INCLUDE_DIR AND CTEMPLATE_LIBRARIES)
+
+
+macro (CTEMPLATE_VARNAMES outfiles)
+
+  foreach (infile ${ARGN})
+    get_filename_component(infile ${infile} ABSOLUTE)
+    CTEMPLATE_MAKE_OUTPUT_file(${infile} varnames.h outfile)
+    add_custom_command(OUTPUT ${outfile}
+                       COMMAND ${CTEMPLATE_COMPILER} -q -f ${outfile} ${infile} 
+                       DEPENDS ${infile} VERBATIM)
+    set(${outfiles} ${${outfiles}} ${outfile})
+  endforeach(infile)
+
+endmacro (CTEMPLATE_VARNAMES outfiles)
+
+# macro used to create the names of output files preserving relative dirs
+macro (CTEMPLATE_MAKE_OUTPUT_file infile ext outfile )
+  string(LENGTH ${CMAKE_CURRENT_BINARY_DIR} _binlength)
+  string(LENGTH ${infile} _infileLength)
+  set(_checkinfile ${CMAKE_CURRENT_SOURCE_DIR})
+  if(_infileLength GREATER _binlength)
+    string(SUBSTRING "${infile}" 0 ${_binlength} _checkinfile)
+    if(_checkinfile STREQUAL "${CMAKE_CURRENT_BINARY_DIR}")
+      file(RELATIVE_PATH rel ${CMAKE_CURRENT_BINARY_DIR} ${infile})
+    else(_checkinfile STREQUAL "${CMAKE_CURRENT_BINARY_DIR}")
+      file(RELATIVE_PATH rel ${CMAKE_CURRENT_SOURCE_DIR} ${infile})
+    endif(_checkinfile STREQUAL "${CMAKE_CURRENT_BINARY_DIR}")
+  else(_infileLength GREATER _binlength)
+    file(RELATIVE_PATH rel ${CMAKE_CURRENT_SOURCE_DIR} ${infile})
+  endif(_infileLength GREATER _binlength)
+  if(WIN32 AND rel MATCHES "^[a-zA-Z]:") # absolute path 
+    string(REGEX REPLACE "^([a-zA-Z]):(.*)$" "\\1_\\2" rel "${rel}")
+  endif(WIN32 AND rel MATCHES "^[a-zA-Z]:") 
+  set(_outfile "${CMAKE_CURRENT_BINARY_DIR}/${rel}")
+  string(REPLACE ".." "__" _outfile ${_outfile})
+  get_filename_component(outpath ${_outfile} PATH)
+  get_filename_component(_outfile ${_outfile} NAME)
+  file(MAKE_DIRECTORY ${outpath})
+  set(${outfile} ${outpath}/${_outfile}.${ext})
+endmacro (CTEMPLATE_MAKE_OUTPUT_file)