#! /usr/local/bin/ruby

def older(file1, file2)
  if !File.exists(file1) then
    return TRUE
  end
  if !File.exists(file2) then
    return FALSE
  end
  if File.mtime(file1) < File.mtime(file2)
    return TRUE
  end
  return FALSE
end

if !File.exists("./Makefile") ||
  older("./Makefile", "../extmk.rb") ||
  older("./Makefile", "./extconf.rb") then

  LINK = "@CC@ -o conftest @CFLAGS@ @LDFLAGS@ conftest.c %s > /dev/null 2>&1"
  $defs = []

  def have_library(func, lib)
    cfile = open("conftest.c", "w")
    printf cfile, "\
int main() { return 0; }
int t() { %s(); return 0; }
", func
    cfile.close

    begin
      if system(format(LINK, "-l" + lib)) != 0
	return FALSE
      end
    ensure
      system "/bin/rm -f conftest*"
    end

    if $libs
      $libs = $libs + " -l" + lib
    else
      $libs = "-l" + lib
    end
    $defs.push(format("-DHAVE_LIB%s", lib.toupper))
    return TRUE
  end

  def have_func(func)

    cfile = open("conftest.c", "w")
    printf cfile, "\
char %s();
int main() { return 0; }
int t() { %s(); return 0; }
", func, func
    cfile.close

    libs = $libs
    libs = "" if libs == nil

    begin
      if system(format(LINK, libs)) != 0
	return FALSE
      end
    ensure
      system "/bin/rm -f conftest*"
    end
    $defs.push(format("-DHAVE_%s", func.toupper))
    return TRUE

  end

  def create_header()
    if $defs.length > 0
      hfile = open("extconf.h", "w")
      for line in $defs
	line =~ /^-D(.*)/
	printf hfile, "#define %s 1\n", $1
      end
      hfile.close
    end
  end

  def create_makefile(target)
    mfile = open("Makefile", "w")
    printf mfile, "\
SHELL = /bin/sh

#### Start of system configuration section. ####

srcdir = @srcdir@
VPATH = @srcdir@

CC = @CC@

CFLAGS = -I../.. @CCDLFLAGS@ @CFLAGS@ %s
LDDLFLAGS = @LDDLFLAGS@
", $defs.join(" ")

    printf mfile, "\

prefix = @prefix@
binprefix = 
exec_prefix = @exec_prefix@
bindir = $(exec_prefix)/bin
@SET_MAKE@

#### End of system configuration section. ####
"
    printf mfile, "OBJS = "
    if !$objs then
      $objs = Dir["*.c"]
      for f in $objs
	f.sub(/\.c$/, ".o")
      end
    end
    printf mfile, $objs.join(" ")
    printf mfile, "\n"

    printf mfile, "\
TARGET = %s.@DLEXT@

all:		$(TARGET)

clean:;		@rm -f *.o *.so
		@rm -f Makefile extconf.h conftest.*
		@rm -f core ruby *~

realclean:	clean
", target

    if "@DLEXT@" == "so"
      printf mfile, "\
.SUFFIXES: .so $(SUFFIXES)

$(TARGET).so: $(OBJS)
	ld $(LDDLFLAGS) -o $*.so $(OBJS)
"
    elsif !File.exists(target + ".c")
      printf mfile, "\
$(TARGET).o: $(OBJS)
	ld $(LDDLFLAGS) -r $*.o $(OBJS)
"
    end

    if File.exists("depend")
      dfile = open("depend", "r")
      printf mfile, "###\n"
      while line = dfile.gets()
	printf mfile, "%s", line
      end
      dfile.close
    end
    mfile.close
  end

  if File.exists("configure") &&
    (!File.exists("config.status") ||
     File.mtime("config.status") < File.mtime("configure")) then

    system "./configure"

  end

  if File.exists("extconf.rb")
    load "extconf.rb"
  else
    Dir.pwd =~ /[^\/]+$/
    create_makefile($&);
  end

end
system "make all" if File.exists("./Makefile")

#Local variables:
# mode: ruby
#end: