Annotation of /trunk/SConstruct

import os, commands, platform, distutils.sysconfig, os.path

version = "0.9.6rc0"

#------------------------------------------------------
# OPTIONS
#
# Note that if you set the options via the command line, they will be
# remembered in the file 'options.cache'. It's a feature ;-)

opts = Options(['options.cache', 'config.py'])
#print "PLATFORM = ",platform.system()

# Import the outside environment
env = Environment(ENV=os.environ)
    
if platform.system()=='Windows' and env.has_key('MSVS'):
    print "INCLUDE =",env['ENV']['INCLUDE']
    print "LIB =",env['ENV']['LIB']
    print "LINK =",env['LINK']
    print "LINKCOM =",env['LINKCOM']
    print "AR =",env['AR']
    print "ARCOM =",env['ARCOM']
    #env['AR']='link /lib'
    env.Append(CPPPATH=env['ENV']['INCLUDE'])
    env.Append(LIBPATH=env['ENV']['LIB'])
    env.Append(CPPDEFINES=['_CRT_SECURE_NO_DEPRECATED','_CRT_SECURE_NO_DEPRECATE'])

if platform.system()=="Windows":
    default_tcl_lib = "tcl83"
    default_tk_lib = "tk83"
    default_tktable_lib = "Tktable28"
else:
    default_tcl_lib = "tcl"
    default_tk_lib = "tk"
    default_tktable_lib = "Tktable2.8"
    

# Package linking option
opts.Add(EnumOption(
    'PACKAGE_LINKING'
    , 'Style of linking for external libraries'
    , 'DYNAMIC_PACKAGES'
    , ['DYNAMIC_PACKAGES', 'STATIC_PACKAGES', 'NO_PACKAGES']
))

# You can turn off building of Tcl/Tk interface
opts.Add(BoolOption(
    'WITHOUT_TCLTK'
    ,"Set to True if you don't want to build the original Tcl/Tk GUI."
    , False
))

# You can turn off the building of the Python interface
opts.Add(BoolOption(
    'WITHOUT_PYTHON'
    ,"Set to True if you don't want to build Python wrappers."
    , False
))

# Which solvers will we allow?
opts.Add(ListOption(
    'WITH_SOLVERS'
    ,"List of the solvers you want to build. The default is the minimum that"   
        +" works."
    ,["QRSLV","CMSLV"]
    ,['QRSLV','MPS','SLV','OPTSQP'
        ,'NGSLV','CMSLV','LRSLV','MINOS','CONOPT'
        ,'LSOD','OPTSQP'
     ]
))

# Where will the local copy of the help files be kept?
opts.Add(PackageOption(
    'WITH_LOCAL_HELP'
    , "Directory containing the local copy of the help files (optional)"
    , "no"
))

# Will bintoken support be enabled?
opts.Add(BoolOption(
    'WITH_BINTOKEN'
    ,"Enable bintoken support? This means compiling models as C-code before"
        +" running them, to increase solving speed for large models."
    ,False
))

# What should the default ASCENDLIBRARY path be?
# Note: users can change it by editing their ~/.ascend.ini
opts.Add(
    'DEFAULT_ASCENDLIBRARY'
    ,"Set the default value of the ASCENDLIBRARY -- the location where"
        +" ASCEND will look for models when running ASCEND"
    ,"$INSTALL_DATA/models"
)

# Where is SWIG?
opts.Add(
    'SWIG'
    ,"SWIG location, probably only required for MinGW and MSVC users."
        +" Enter the location as a Windows-style path, for example"
        +" 'c:\\msys\\1.0\\home\\john\\swigwin-1.3.29\\swig.exe'."
)

# Build the test suite?
opts.Add(BoolOption(
    'WITH_CUNIT_TESTS'
    ,"Whether to build the CUnit tests. Default is off. If set to on,"
        +" you must have CUnit installed somewhere that SCons can"
        +" find it, or else use the CUNIT_* options to specify."
    ,False
))

# Where are the CUnit includes?
opts.Add(PackageOption(
    'CUNIT_CPPPATH'
    ,"Where are your CUnit include files?"
    ,'off'
))

# Where are the CUnit libraries?
opts.Add(PackageOption(
    'CUNIT_LIBPATH'
    ,"Where are your CUnit libraries?"
    ,'off'
))

# Where are the Tcl includes?
opts.Add(PackageOption(
    'TCL_CPPPATH'
    ,"Where are your Tcl include files?"
    ,"disable"
))

# Where are the Tcl libs?
opts.Add(PackageOption(
    'TCL_LIBPATH'
    ,"Where are your Tcl libraries?"
    ,'off'
))

# What is the name of the Tcl lib?
opts.Add(
    'TCL_LIB'
    ,"Name of Tcl lib (eg 'tcl' or 'tcl83')"
    ,default_tcl_lib
)

# Where are the Tk includes?
opts.Add(PackageOption(
    'TK_CPPPATH'
    ,"Where are your Tk include files?"
    ,'$TCL_CPPPATH'
))

# Where are the Tk libs?
opts.Add(PackageOption(
    'TK_LIBPATH'
    ,"Where are your Tk libraries?"
    ,'$TCL_LIBPATH'
))

# What is the name of the Tk lib?
opts.Add(
    'TK_LIB'
    ,"Name of Tk lib (eg 'tk' or 'tk83')"
    ,default_tk_lib
)   

# Static linking to TkTable

opts.Add(BoolOption(
    'STATIC_TKTABLE'
    ,'Use static linking to TkTable or not'
    ,False
))

opts.Add(
    'TKTABLE_LIBPATH'
    ,'Location of TkTable static library'
    ,'$TCL_LIBPATH/Tktable2.8'
)

opts.Add(
    'TKTABLE_LIB'
    ,'Name of TkTable static library (excluding suffix/prefix, eg libtktable2.8.so -> tktable2.8)'
    ,default_tktable_lib
)

opts.Add(
    'INSTALL_PREFIX'
    ,'Root location for installed files'
    ,'/usr/local'
)

opts.Add(
    'INSTALL_BIN'
    ,'Location to put binaries during installation'
    ,"$INSTALL_PREFIX/bin"
)

opts.Add(
    'INSTALL_LIB'
    ,'Location to put binaries during installation'
    ,"$INSTALL_PREFIX/lib"
)

opts.Add(
    'INSTALL_DATA'
    ,'Location to put data files during installation'
    ,"$INSTALL_PREFIX/share"
)

opts.Add(
    'INSTALL_INCLUDE'
    ,'Location to put header files during installation'
    ,"$INSTALL_PREFIX/include"
)

if platform.system()=="Windows":
    default_install_assets = "glade/"
    icon_extension = '.png'
else:
    default_install_assets = "$INSTALL_DATA/ascend/glade/"
    icon_extension = '.svg'

opts.Add(
    'PYGTK_ASSETS'
    ,'Default location for Glade assets (placed in pygtk/interface/config.py)'
    ,default_install_assets
)

opts.Add(
    'INSTALL_ROOT'
    ,'For use by RPM only: location of %{buildroot} during rpmbuild'
    ,""
)

if platform.system()=="Windows":
    opts.Add(BoolOption(
        'WITH_INSTALLER'
        ,'Build the Windows Installer (setup program) using NSIS'
        ,False
    ))

# TODO: OTHER OPTIONS?
# TODO: flags for optimisation
# TODO: turning on/off bintoken functionality
# TODO: Where will the 'Makefile.bt' file be installed?

opts.Update(env)
opts.Save('options.cache',env)

Help(opts.GenerateHelpText(env))

with_tcltk_gui = (env['WITHOUT_TCLTK']==False)
without_tcltk_reason = "disabled by options/config.py"

with_python = (env['WITHOUT_PYTHON']==False)
without_python_reason = "disabled by options/config.py"

with_cunit_tests = env['WITH_CUNIT_TESTS']
without_cunit_reason = "not requested"

#print "SOLVERS:",env['WITH_SOLVERS']
#print "WITH_BINTOKEN:",env['WITH_BINTOKEN']
#print "DEFAULT_ASCENDLIBRARY:",env['DEFAULT_ASCENDLIBRARY']

subst_dict = {
    '@WEBHELPROOT@':'http://pye.dyndns.org/ascend/manual/'
    , '@GLADE_FILE@':'ascend.glade'
    , '@DEFAULT_ASCENDLIBRARY@':env['DEFAULT_ASCENDLIBRARY']
    , '@ICON_EXTENSION@':icon_extension
    , '@HELP_ROOT@':''
    , '@INSTALL_DATA@':env['INSTALL_DATA']
    , '@INSTALL_BIN@':env['INSTALL_BIN']
    , '@INSTALL_INCLUDE@':env['INSTALL_INCLUDE']
    , '@PYGTK_ASSETS@':env['PYGTK_ASSETS']
    , '@VERSION@':version
}

if env['WITH_LOCAL_HELP']:
    print "WITH_LOCAL_HELP:",env['WITH_LOCAL_HELP']
    subst_dict['@HELP_ROOT@']=env['WITH_LOCAL_HELP']

can_install = True
if platform.system()=='Windows':
    can_install = False

env['CAN_INSTALL']=can_install

env.Append(SUBST_DICT=subst_dict)

#------------------------------------------------------
# SPECIAL CONFIGURATION TESTS

need_fortran = False

#----------------
# SWIG

import os,re

def get_swig_version(env):
    cmd = env['SWIG']+' -version'
    (cin,coutcerr) = os.popen4(cmd)
    output = coutcerr.read()
    
    restr = "SWIG\\s+Version\\s+(?P<maj>[0-9]+)\\.(?P<min>[0-9]+)\\.(?P<pat>[0-9]+)\\s*$"
    expr = re.compile(restr,re.M);
    m = expr.search(output);
    if not m:
        return None
    maj = int(m.group('maj'))
    min = int(m.group('min'))
    pat = int(m.group('pat'))

    return (maj,min,pat)
    

def CheckSwigVersion(context):
    
    try:
        context.Message("Checking version of SWIG... ")
        maj,min,pat = get_swig_version(context.env)
    except:
        context.Result("Failed to detect version, or failed to run SWIG")
        return 0;
    
    if maj == 1 and (
            min > 3
            or (min == 3 and pat >= 24)
        ):
        context.Result("ok, %d.%d.%d" % (maj,min,pat))
        return 1;
    else:
        context.Result("too old, %d.%d.%d" % (maj,min,pat))
        return 0;

#----------------
# General purpose library-and-header test

class KeepContext:
    def __init__(self,context,varprefix):
        self.keep = {}
        for k in ['LIBS','LIBPATH','CPPPATH']:
            if context.env.has_key(k):
                self.keep[k] = context.env[k]
            else:
                self.keep[k] = None
        
        libpath_add = []
        if context.env.has_key(varprefix+'_LIBPATH'):
            libpath_add = [env[varprefix+'_LIBPATH']]
            #print "Adding '"+str(libpath_add)+"' to lib path"

        cpppath_add = []
        if context.env.has_key(varprefix+'_CPPPATH'):
            cpppath_add = [env[varprefix+'_CPPPATH']]
            #print "Adding '"+str(cpppath_add)+"' to cpp path"

        libs_add = []
        if context.env.has_key(varprefix+'_LIB'):
            libs_add = [env[varprefix+'_LIB']]
            #print "Adding '"+str(libs_add)+"' to libs" 

        context.env.Append(
            LIBPATH = libpath_add
            , CPPPATH = cpppath_add
            , LIBS = libs_add
        )

    def restore(self,context):
        #print "RESTORING CONTEXT"
        #print self.keep
        #print "..."
        for k in self.keep:
            if self.keep[k]==None:
                #print "Clearing "+str(k)
                del context.env[k];
            else:
                #print "Restoring "+str(k)+" to '"+self.keep[k]+"'"             
                context.env[k]=self.keep[k];

def CheckExtLib(context,libname,text,ext='.c',varprefix=None):
    """This method will check for variables LIBNAME_LIBPATH
    and LIBNAME_CPPPATH and try to compile and link the 
    file with the provided text, linking with the 
    library libname."""

    context.Message( 'Checking for '+libname+'... ' )
    
    if varprefix==None:
        varprefix = libname.upper()
    
    keep = KeepContext(context,varprefix)

    if not context.env.has_key(varprefix+'_LIB'):
        # if varprefix_LIB were in env, KeepContext would 
        # have appended it already
        context.env.Append(LIBS=libname)

    is_ok = context.TryLink(text,ext)
    
#   print "Link success? ",(is_ok != 0)

    keep.restore(context)

#   print "Restored CPPPATH="+str(context.env['CPPPATH'])
#   print "Restored LIBS="+libname
#   print "Restored LIBPATH="+str(context.env['LIBPATH'])

    context.Result(is_ok)
    return is_ok

#----------------
# CUnit test

cunit_test_text = """
#include <CUnit/CUnit.h>
int maxi(int i1, int i2){
    return (i1 > i2) ? i1 : i2;
}

void test_maxi(void){
    CU_ASSERT(maxi(0,2) == 2);
    CU_ASSERT(maxi(0,-2) == 0);
    CU_ASSERT(maxi(2,2) == 2);

}
int main(void){
/*  CU_initialize_registry() */
    return 0;
}
"""

def CheckCUnit(context):
    return CheckExtLib(context,'cunit',cunit_test_text)

#----------------
# Tcl test

tcl_check_text = r"""
#include <tcl.h>
#include <stdio.h>
int main(void){
    printf("%s",TCL_PATCH_LEVEL);
    return 0;
}
"""

def CheckTcl(context):
    return CheckExtLib(context,'tcl',tcl_check_text)

def CheckTclVersion(context):
    keep = KeepContext(context,'TCL')
    context.Message("Checking Tcl version... ")
    (is_ok,output) = context.TryRun(tcl_check_text,'.c')
    keep.restore(context)
    if not is_ok:
        context.Result("failed to run check")
        return 0

    major,minor,patch = tuple(int(i) for i in output.split("."))
    if major != 8 or minor > 3:
        context.Result(output+" (bad version)")
        # bad version
        return 0
        
    # good version
    context.Result(output+" (good)")
    return 1

#----------------
# Tk test

tk_check_text = r"""
#include <tk.h>
#include <stdio.h>
int main(void){
    printf("%s",TK_PATCH_LEVEL);
    return 0;
}
"""
def CheckTk(context):
    return CheckExtLib(context,'tk',tcl_check_text)


def CheckTkVersion(context):
    keep = KeepContext(context,'TK')
    context.Message("Checking Tk version... ")
    (is_ok,output) = context.TryRun(tk_check_text,'.c')
    keep.restore(context)
    if not is_ok:
        context.Result("failed to run check")
        return 0
    context.Result(output)

    major,minor,patch = tuple(int(i) for i in output.split("."))
    if major != 8 or minor > 3:
        # bad version
        return 0
        
    # good version
    return 1
    
#------------------------------------------------------
# CONFIGURATION

conf = Configure(env
    , custom_tests = { 
        'CheckSwigVersion' : CheckSwigVersion
        , 'CheckCUnit' : CheckCUnit
        , 'CheckTcl' : CheckTcl
        , 'CheckTclVersion' : CheckTclVersion
        , 'CheckTk' : CheckTk
        , 'CheckTkVersion' : CheckTkVersion
#       , 'CheckIsNan' : CheckIsNan
#       , 'CheckCppUnitConfig' : CheckCppUnitConfig
    } 
#   , config_h = "config.h"
)


# Math library

#if not conf.CheckFunc('sinh') and not conf.CheckLibWithHeader(['m','c','libc'], 'math.h', 'C'):
#   print 'Did not find math library, exiting!'
#   Exit(1)

# Where is 'isnan'?

if not conf.CheckFunc('isnan'):
    print "Didn't find isnan"
#   Exit(1)

# Tcl/Tk

if conf.CheckTcl():
    if with_tcltk_gui and conf.CheckTclVersion():
        if conf.CheckTk():
            if with_tcltk_gui and not conf.CheckTkVersion():
                without_tcltk_reason = "Require Tk version <= 8.3. See 'scons -h'"
                with_tcltk_gui = False
        else:
            without_tcltk_reason = "Tk not found."
            with_tcltk_gui = False
    else:
        without_tcltk_reason = "Require Tcl <= 8.3 Tcl."
        with_tcltk_gui = False

else:
    without_tcltk_reason = "Tcl not found."
    with_tcltk_gui = False

# Python... obviously we're already running python, so we just need to
# check that we can link to the python library OK:

if platform.system()=="Windows":
    python_lib='python24'
else:
    python_lib='python2.4'

# SWIG version

if platform.system()=="Windows":
    env['ENV']['SWIGFEATURES']='-O'
else:
    env['ENV']['SWIGFEATURES']='-O' 


if not conf.CheckSwigVersion():
    without_python_reason = 'SWIG >= 1.3.24 is required'
    with_python = False

# CUnit

if with_cunit_tests:
    if not conf.CheckCUnit():
        without_cunit_reason = 'CUnit not found'

# BLAS

need_blas=False
if with_tcltk_gui:
    need_blas=True
if need_blas:
    if conf.CheckLib('blas'):
        print "FOUND BLAS"
        with_local_blas = False
        without_local_blas_reason = "Found BLAS installed on system"
    else:
        print "DIDN'T FIND BLAS"
        with_local_blas = True
        need_fortran = True

# FORTRAN

if need_fortran:
    conf.env.Tool('f77')
    detect_fortran = conf.env.Detect(['g77','f77'])
    if detect_fortran:
        # For some reason, g77 doesn't get detected properly on MinGW
        if not env.has_key('F77'):
            conf.env.Replace(F77=detect_fortran)
            conf.env.Replace(F77COM='$F77 $F77FLAGS -c -o $TARGET $SOURCE')
            conf.env.Replace(F77FLAGS='')
            #print "F77:",conf.env['F77']
            #print "F77COM:",conf.env['F77COM']
            #print "F77FLAGS:",conf.env['F77FLAGS']
            fortran_builder = Builder(
                action='$F77COM'
                , suffix='.o'
                , src_suffix='.f'
            )
            conf.env.Append(BUILDERS={'Fortran':fortran_builder})
    else:
        print "FORTRAN-77 required but not found"
        Exit(1)
#else:
#   print "FORTRAN not required"

# TODO: -D_HPUX_SOURCE is needed

# TODO: check size of void*

# TODO: detect if dynamic libraries are possible or not

if platform.system()=="Windows" and env.has_key('MSVS'):
    if not conf.CheckHeader('windows.h') and env['PACKAGE_LINKING']=='DYNAMIC_PACKAGES':
        print "Reverting to STATIC_PACKAGES since windows.h is not available. Probably you "\
            +"need to install the Microsoft Windows Server 2003 Platform SDK, or similar."
        env['PACKAGE_LINKING']='STATIC_PACKAGES'
        
    if with_python and not conf.CheckHeader('basetsd.h'):
        with_python = 0;
        without_python_reason = "Header file 'basetsd.h' not found. Install the MS Platform SDK."

conf.env.Append(CPPDEFINES=env['PACKAGE_LINKING'])

conf.Finish()

env.Append(PYTHON_LIBPATH=[distutils.sysconfig.PREFIX+"/libs"])
env.Append(PYTHON_LIB=[python_lib])
env.Append(PYTHON_CPPPATH=[distutils.sysconfig.get_python_inc()])

#------------------------------------------------------
# RECIPE: 'SubstInFile', used in pygtk SConscript

import re
from SCons.Script import *  # the usual scons stuff you get in a SConscript

def TOOL_SUBST(env):
    """Adds SubstInFile builder, which substitutes the keys->values of SUBST_DICT
    from the source to the target.
    The values of SUBST_DICT first have any construction variables expanded
    (its keys are not expanded).
    If a value of SUBST_DICT is a python callable function, it is called and
    the result is expanded as the value.
    If there's more than one source and more than one target, each target gets
    substituted from the corresponding source.
    """
    env.Append(TOOLS = 'SUBST')
    def do_subst_in_file(targetfile, sourcefile, dict):
        """Replace all instances of the keys of dict with their values.
        For example, if dict is {'%VERSION%': '1.2345', '%BASE%': 'MyProg'},
        then all instances of %VERSION% in the file will be replaced with 1.2345 etc.
        """
        try:
            f = open(sourcefile, 'rb')
            contents = f.read()
            f.close()
        except:
            raise SCons.Errors.UserError, "Can't read source file %s"%sourcefile
        for (k,v) in dict.items():
            contents = re.sub(k, v, contents)
        try:
            f = open(targetfile, 'wb')
            f.write(contents)
            f.close()
        except:
            raise SCons.Errors.UserError, "Can't write target file %s"%targetfile
        return 0 # success

    def subst_in_file(target, source, env):
        if not env.has_key('SUBST_DICT'):
            raise SCons.Errors.UserError, "SubstInFile requires SUBST_DICT to be set."
        d = dict(env['SUBST_DICT']) # copy it
        for (k,v) in d.items():
            if callable(v):
                d[k] = env.subst(v())
            elif SCons.Util.is_String(v):
                d[k]=env.subst(v)
            else:
                raise SCons.Errors.UserError, "SubstInFile: key %s: %s must be a string or callable"%(k, repr(v))
        for (t,s) in zip(target, source):
            return do_subst_in_file(str(t), str(s), d)

    def subst_in_file_string(target, source, env):
        """This is what gets printed on the console."""
        return '\n'.join(['Substituting vars from %s into %s'%(str(s), str(t))
                          for (t,s) in zip(target, source)])

    def subst_emitter(target, source, env):
        """Add dependency from substituted SUBST_DICT to target.
        Returns original target, source tuple unchanged.
        """
        d = env['SUBST_DICT'].copy() # copy it
        for (k,v) in d.items():
            if callable(v):
                d[k] = env.subst(v())
            elif SCons.Util.is_String(v):
                d[k]=env.subst(v)
        Depends(target, SCons.Node.Python.Value(d))
        return target, source

    subst_action=SCons.Action.Action(subst_in_file, subst_in_file_string)
    env['BUILDERS']['SubstInFile'] = Builder(action=subst_action, emitter=subst_emitter)

TOOL_SUBST(env)

#------------------------------------------------------
# Recipe for 'CHMOD' ACTION      
     
import SCons     
from SCons.Script.SConscript import SConsEnvironment     
SConsEnvironment.Chmod = SCons.Action.ActionFactory(os.chmod,    
    lambda dest, mode: 'Chmod("%s", 0%o)' % (dest, mode))    
     
def InstallPerm(env, dest, files, perm):     
    obj = env.Install(dest, files)   
    for i in obj:    
        env.AddPostAction(i, env.Chmod(str(i), perm))    
     
SConsEnvironment.InstallPerm = InstallPerm   
     
# define wrappers    
SConsEnvironment.InstallProgram = lambda env, dest, files: InstallPerm(env, dest, files, 0755)   
SConsEnvironment.InstallHeader = lambda env, dest, files: InstallPerm(env, dest, files, 0644)    

#------------------------------------------------------
# NSIS Support for SCons

# Adapted version by John Pye, April 2006.
# from http://www.scons.org/cgi-sys/cgiwrap/scons/moin.cgi/NsisSconsTool
# Written by Mike Elkins, January 2004.

#This tool provides SCons support for the Nullsoft Scriptable Install System
#a windows installer builder available at http://nsis.sourceforge.net/home

#In addition, if you set NSISDEFINES to a dictionary, those variables will be passed
#to NSIS.

import SCons.Builder
import SCons.Util
import SCons.Scanner
import SCons.Sig
import os.path
import glob

def nsis_parse( sources, keyword, multiple ):
  """
  A function that knows how to read a .nsi file and figure
  out what files are referenced, or find the 'OutFile' line.


  sources is a list of nsi files.
  keyword is the command ('File' or 'OutFile') to look for
  multiple is true if you want all the args as a list, false if you
  just want the first one.
  """
  stuff = []
  for s in sources:
    c = s.get_contents()
    for l in c.split('\n'):
      semi = l.find(';')
      if (semi != -1):
        l = l[:semi]
      hash = l.find('#')
      if (hash != -1):
        l = l[:hash]
      # Look for the keyword
      l = l.strip()
      spl = l.split(None,1)
      if len(spl) > 1:
        if spl[0].capitalize() == keyword.capitalize():
          arg = spl[1]
          if arg.startswith('"') and arg.endswith('"'):
            arg = arg[1:-1]
          if multiple:
            stuff += [ arg ]
          else:
            return arg
  return stuff


def nsis_path( filename, nsisdefines, rootdir ):
  """
  Do environment replacement, and prepend with the SCons root dir if
  necessary
  """
  # We can't do variables defined by NSIS itself (like $INSTDIR),
  # only user supplied ones (like ${FOO})
  varPos = filename.find('${')
  while varPos != -1:
    endpos = filename.find('}',varPos)
    assert endpos != -1
    if not nsisdefines.has_key(filename[varPos+2:endpos]):
      raise KeyError ("Could not find %s in NSISDEFINES" % filename[varPos+2:endpos])
    val = nsisdefines[filename[varPos+2:endpos]]
    if type(val) == list:
      if varPos != 0 or endpos+1 != len(filename):
        raise Exception("Can't use lists on variables that aren't complete filenames")
      return val
    filename = filename[0:varPos] + val + filename[endpos+1:]
    varPos = filename.find('${')
  return filename


def nsis_scanner( node, env, path ):
  """
  The scanner that looks through the source .nsi files and finds all lines
  that are the 'File' command, fixes the directories etc, and returns them.
  """
  nodes = node.rfile()
  if not node.exists():
    return []
  nodes = []
  source_dir = node.get_dir()
  for include in nsis_parse([node],'file',1):
    exp = nsis_path(include,env['NSISDEFINES'],source_dir)
    if type(exp) != list:
      exp = [exp]
    for p in exp:
      for filename in glob.glob( os.path.abspath(
        os.path.join(str(source_dir),p))):
          # Why absolute path?  Cause it breaks mysteriously without it :(
          nodes.append(filename)
  return nodes


def nsis_emitter( source, target, env ):
  """
  The emitter changes the target name to match what the command actually will
  output, which is the argument to the OutFile command.
  """
  nsp = nsis_parse(source,'outfile',0)
  if not nsp:
    return (target,source)
  x  = (
    nsis_path(nsp,env['NSISDEFINES'],''),
    source)
  return x

def quoteIfSpaced(text):
  if ' ' in text:
    return '"'+text+'"'
  else:
    return text

def toString(item,env):
  if type(item) == list:
    ret = ''
    for i in item:
      if ret:
        ret += ' '
      val = toString(i,env)
      if ' ' in val:
        val = "'"+val+"'"
      ret += val
    return ret
  else:
    # For convienence, handle #s here
    if str(item).startswith('#'):
      item = env.File(item).get_abspath()
    return str(item)

def runNSIS(source,target,env,for_signature):
  ret = env['NSIS']+" "
  if env.has_key('NSISFLAGS'):
    for flag in env['NSISFLAGS']:
      ret += flag
      ret += ' '
  if env.has_key('NSISDEFINES'):
    for d in env['NSISDEFINES']:
      ret += '/D'+d
      if env['NSISDEFINES'][d]:
        ret +='='+quoteIfSpaced(toString(env['NSISDEFINES'][d],env))
      ret += ' '
  for s in source:
    ret += quoteIfSpaced(str(s))
  return ret

def find_nsis(env):
  """
  Try and figure out if NSIS is installed on this machine, and if so,
  where.
  """
  if SCons.Util.can_read_reg:
    # If we can read the registry, get the NSIS command from it
    try:
      k = SCons.Util.RegOpenKeyEx(SCons.Util.hkey_mod.HKEY_LOCAL_MACHINE,
                                  'SOFTWARE\\NSIS')
      val, tok = SCons.Util.RegQueryValueEx(k,None)
      ret = val + os.path.sep + 'makensis.exe'
      if os.path.exists(ret):
        return '"' + ret + '"'
      else:
        return None
    except:
      pass # Couldn't find the key, just act like we can't read the registry
  # Hope it's on the path
  return env.WhereIs('makensis.exe')

def nsis_exists(env):
  """
  Is NSIS findable on this machine?
  """
  if find_nsis(env) != None:
    return 1
  return 0

env['BUILDERS']['Nsis'] = SCons.Builder.Builder(generator=runNSIS,
                                 src_suffix='.nsi',
                                 emitter=nsis_emitter)

env.Append(SCANNERS = SCons.Scanner.Scanner( function = nsis_scanner,
             skeys = ['.nsi']))

if not env.has_key('NSISDEFINES'):
    env['NSISDEFINES'] = {}
env['NSIS'] = find_nsis(env)

#------------------------------------------------------
# BUILD...

# so that #include <modulename/headername.h> works across all modules...
env.Append(CPPPATH=['#base/generic'])

#-------------
# TCL/TK GUI

if with_tcltk_gui:
    if with_local_blas:
        env.SConscript(['blas/SConscript'],'env')
    else:
        print "Skipping... BLAS won't be build:", without_local_blas_reason

    env.SConscript(['lsod/SConscript'],'env')       

    env.SConscript(['linpack/SConscript'],'env')
    env.SConscript(['tcltk98/generic/interface/SConscript'],'env')
else:
    print "Skipping... Tcl/Tk GUI isn't being built:",without_tcltk_reason

#-------------
# PYTHON INTERFACE

if with_python:
    env.SConscript(['pygtk/interface/SConscript'],'env')
else:
    print "Skipping... Python GUI isn't being built:",without_python_reason

#------------
# BASE/GENERIC SUBDIRECTORIES

dirs = ['general','utilities','compiler','solver','packages']

srcs = []
for d in dirs:
    heresrcs = env.SConscript('base/generic/'+d+'/SConscript','env')
    srcs += heresrcs

#-------------
# LIBASCEND -- all base/generic functionality

libascend = env.SharedLibrary('ascend',srcs)

#-------------
# UNIT TESTS

if with_cunit_tests:
    testdirs = ['general','solver','utilities']
    for testdir in testdirs:
        path = 'base/generic/'+testdir+'/test/'
        env.SConscript([path+'SConscript'],'env')
    env.SConscript(['test/SConscript'],'env')
    env.SConscript(['base/generic/test/SConscript'],'env')
    
    
else:
    print "Skipping... CUnit tests aren't being built:",without_cunit_reason


#------------------------------------------------------
# INSTALLATION

if env.has_key('CAN_INSTALL') and env['CAN_INSTALL']:
    # the models directory only needs to be processed for installation, no other processing required.
    env.SConscript(['models/SConscript'],'env')

    dirs = ['INSTALL_BIN','INSTALL_DATA','INSTALL_LIB']
    install_dirs = [env['INSTALL_ROOT']+env[d] for d in dirs]

    # TODO: add install options
    env.Alias('install',install_dirs)

    env.Install(env['INSTALL_ROOT']+env['INSTALL_LIB'],libascend)

#------------------------------------------------------
# CREATE the SPEC file for generation of RPM packages

if platform.system()=="Linux":
    env.SubstInFile('ascend.spec.in')