# This module handles the use (or non-use) of the externall
# xmlrpc-c library (including the abyss server) that is needed for 
# moses server functionality

if [ option.get "no-xmlrpc-c" : : "yes" ]
{
  rule xmlrpc ( what ? ) { } # never return anything
}
else
{
  local xmlrpc = [ option.get "with-xmlrpc-c" ] ; 
  if ! $(xmlrpc) # check for environment variable
  {
    local where = [ os.environ "XMLRPC_C_ROOT" ] ;
    if $(where) 
    { 
      option.set "with-xmlrpc-c" : $(where) ; 
      local msg = "setting --with-xmlrpc-c=$(where) via environment " ;
      echo "$(msg) variable XMLRPC_C_ROOT" ;
    }
    xmlrpc = [ option.get "with-xmlrpc-c" ] ; 
  }
  local config ; 
  if ! $(xmlrpc) { config = "xmlrpc-c-config" ; }
  else { config = "$(xmlrpc)/bin/xmlrpc-c-config" ; }

  # check if xmlrpc-config can be executed
  xmlrpc-check = [ _shell "$(config) --features 2>/dev/null" : exit-status ] ; 

  if $(xmlrpc-check[2]) = 0 # yes it can
  { 
    # is the abyss server is available ?
    if [ MATCH "(abyss-server)" : $(xmlrpc-check[1]) ] 
    {
      # Yes, abyss server is available. Is it the right xmlrpc-c version ?
      # Note: Version 1.25.29 does not work. 
      xmlrpc-check = [ _shell "$(config) --version 2>/dev/null" : exit-status ] ; 
      xmlrpc-c-version = $(xmlrpc-check[1]) ; 
      if [ MATCH "(1.25.29)" : $(xmlrpc-c-version) ] 
      {
        echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" ;
	echo "XMLRPC-C: Moses is not compatible with xmlrpc-c version $(xmlrpc-c-version). " ; 
	echo "XMLRPC-C: Use another one or compile without server functionality (--no-xmlrpc-c)." ; 
	echo "XMLRPC-C: Build aborted." ; 
	exit : 1 ;
      }
    }
    else 
    {
      echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" ;
      echo "XMLRPC-C: Found xmlrpc-c but it does not provide the abyss server." ;
      echo "XMLRPC-C: Use another xmlrpc-c installation that provides one " ; 
      echo "XMLRPC-C: or compile without server functionality (--no-xmlrpc-c)." ; 
      exit : 1 ;
    }
    local prefix  = [ shell_or_die "$(config) --prefix" ] ;
    local version = [ shell_or_die "$(config) --version" ] ;
    
    # Check the version is recent enough:
    # If anyone knows a better way to do this, go ahead and fix this.
    minversion = 1.32.0 ;
    local cmd = "perl -e '@a = split(/\\./,@ARGV[0]); @b = split(/\\./,$ARGV[1]); ++$i while $i < $#a && $a[$i] == $b[$i]; die if $a[$i] < $b[$i];'" ;
    local check = [ SHELL "$(cmd) $(version) $(minversion) 2>/dev/null" : exit-status ] ;
    if $(check[2]) = 0 
    {
       echo "XMLRPC-C: USING VERSION $(version) FROM $(prefix)" ;
    } 
    else 
    {
      echo "\nCOMPILATION FAILED! YOUR VERSION OF THE XMLRPC-C LIBRARY IS TOO OLD.\n" ;
      echo "Moses server functionality requires XMLRPC-C version $(minversion) or newer." ;
      echo "The version provided in $(prefix) is $(version). " ;
      echo "Install a suitable version if necessary and provide its location with\n " ;
      echo "   --with-xmlrpc-c=/path/to/correct/version\n" ; 
      echo "You can also use --no-xmlrpc-c to compile without the xmlrpc-c library, " ; 
      echo "in which case Moses will work in batch mode, but can't be run as a server. " ; 
      exit : 1 ;
    }

    # now add stuff to the requirements
    local xmlrpc-cxxflags = [ shell_or_die "$(config) c++2 abyss-server --cflags" ] ;
    requirements += <define>HAVE_XMLRPC_C ;
    requirements += <cxxflags>$(xmlrpc-cxxflags) ;
    
    local libs = [ shell_or_die "$(config) c++2 abyss-server --libs" ] ;
    for local i in [ SPLIT_BY_CHARACTERS $(libs) : " " ] 
    { 
      local libname = [ MATCH "-l(xmlrpc.*)" : $(i) ] ; 
      if $(libname) 
      {   
	external-lib $(libname) : $(prefix)/lib ;
	#      : : <runtime-link>static:<link>static <runtime-link>shared:<link>shared ;
	requirements += <library>$(libname) ;
      }
      local pathname = [ MATCH "-L(.*)" : $(i) ] ; 
      if $(pathname)
      {
	requirements += <library-path>$(pathname) ; 
      }
    }
  
    rule xmlrpc { return yes ; }
  }
  else if [ option.get "with-xmlrpc-c" ] 
  {
    echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" ;
    echo "XMLRPC-C: Could not find $(config). " ;
    echo "Build aborted. " ; 
    echo "Use --no-xmlrpc-c to compile moses without server functionality. " ; 
    exit : 1 ;
  }
  else
  {
    rule xmlrpc ( what ? ) { } # never return anything
  }
  
}