Added an unmodified copy of SCons to third_party.

scons-2.0.1/engine/SCons/Tool/tex.py

+"""SCons.Tool.tex
+
+Tool-specific initialization for TeX.
+Generates .dvi files from .tex files
+
+There normally shouldn't be any need to import this module directly.
+It will usually be imported through the generic SCons.Tool.Tool()
+selection method.
+
+"""
+
+#
+# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 The SCons Foundation
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+__revision__ = "src/engine/SCons/Tool/tex.py 5134 2010/08/16 23:02:40 bdeegan"
+
+import os.path
+import re
+import shutil
+import sys
+import platform
+
+import SCons.Action
+import SCons.Node
+import SCons.Node.FS
+import SCons.Util
+import SCons.Scanner.LaTeX
+
+Verbose = False
+
+must_rerun_latex = True
+
+# these are files that just need to be checked for changes and then rerun latex
+check_suffixes = ['.toc', '.lof', '.lot', '.out', '.nav', '.snm']
+
+# these are files that require bibtex or makeindex to be run when they change
+all_suffixes = check_suffixes + ['.bbl', '.idx', '.nlo', '.glo', '.acn']
+
+#
+# regular expressions used to search for Latex features
+# or outputs that require rerunning latex
+#
+# search for all .aux files opened by latex (recorded in the .fls file)
+openout_aux_re = re.compile(r"INPUT *(.*\.aux)")
+
+#printindex_re = re.compile(r"^[^%]*\\printindex", re.MULTILINE)
+#printnomenclature_re = re.compile(r"^[^%]*\\printnomenclature", re.MULTILINE)
+#printglossary_re = re.compile(r"^[^%]*\\printglossary", re.MULTILINE)
+
+# search to find rerun warnings
+warning_rerun_str = '(^LaTeX Warning:.*Rerun)|(^Package \w+ Warning:.*Rerun)'
+warning_rerun_re = re.compile(warning_rerun_str, re.MULTILINE)
+
+# search to find citation rerun warnings
+rerun_citations_str = "^LaTeX Warning:.*\n.*Rerun to get citations correct"
+rerun_citations_re = re.compile(rerun_citations_str, re.MULTILINE)
+
+# search to find undefined references or citations warnings
+undefined_references_str = '(^LaTeX Warning:.*undefined references)|(^Package \w+ Warning:.*undefined citations)'
+undefined_references_re = re.compile(undefined_references_str, re.MULTILINE)
+
+# used by the emitter
+auxfile_re = re.compile(r".", re.MULTILINE)
+tableofcontents_re = re.compile(r"^[^%\n]*\\tableofcontents", re.MULTILINE)
+makeindex_re = re.compile(r"^[^%\n]*\\makeindex", re.MULTILINE)
+bibliography_re = re.compile(r"^[^%\n]*\\bibliography", re.MULTILINE)
+listoffigures_re = re.compile(r"^[^%\n]*\\listoffigures", re.MULTILINE)
+listoftables_re = re.compile(r"^[^%\n]*\\listoftables", re.MULTILINE)
+hyperref_re = re.compile(r"^[^%\n]*\\usepackage.*\{hyperref\}", re.MULTILINE)
+makenomenclature_re = re.compile(r"^[^%\n]*\\makenomenclature", re.MULTILINE)
+makeglossary_re = re.compile(r"^[^%\n]*\\makeglossary", re.MULTILINE)
+makeglossaries_re = re.compile(r"^[^%\n]*\\makeglossaries", re.MULTILINE)
+makeacronyms_re = re.compile(r"^[^%\n]*\\makeglossaries", re.MULTILINE)
+beamer_re = re.compile(r"^[^%\n]*\\documentclass\{beamer\}", re.MULTILINE)
+
+# search to find all files included by Latex
+include_re = re.compile(r'^[^%\n]*\\(?:include|input){([^}]*)}', re.MULTILINE)
+includeOnly_re = re.compile(r'^[^%\n]*\\(?:include){([^}]*)}', re.MULTILINE)
+
+# search to find all graphics files included by Latex
+includegraphics_re = re.compile(r'^[^%\n]*\\(?:includegraphics(?:\[[^\]]+\])?){([^}]*)}', re.MULTILINE)
+
+# search to find all files opened by Latex (recorded in .log file)
+openout_re = re.compile(r"OUTPUT *(.*)")
+
+# list of graphics file extensions for TeX and LaTeX
+TexGraphics   = SCons.Scanner.LaTeX.TexGraphics
+LatexGraphics = SCons.Scanner.LaTeX.LatexGraphics
+
+# An Action sufficient to build any generic tex file.
+TeXAction = None
+
+# An action to build a latex file.  This action might be needed more
+# than once if we are dealing with labels and bibtex.
+LaTeXAction = None
+
+# An action to run BibTeX on a file.
+BibTeXAction = None
+
+# An action to run MakeIndex on a file.
+MakeIndexAction = None
+
+# An action to run MakeIndex (for nomencl) on a file.
+MakeNclAction = None
+
+# An action to run MakeIndex (for glossary) on a file.
+MakeGlossaryAction = None
+
+# An action to run MakeIndex (for acronyms) on a file.
+MakeAcronymsAction = None
+
+# Used as a return value of modify_env_var if the variable is not set.
+_null = SCons.Scanner.LaTeX._null
+
+modify_env_var = SCons.Scanner.LaTeX.modify_env_var
+
+def check_file_error_message(utility, filename='log'):
+    msg = '%s returned an error, check the %s file\n' % (utility, filename)
+    sys.stdout.write(msg)
+
+def FindFile(name,suffixes,paths,env,requireExt=False):
+    if requireExt:
+        name,ext = SCons.Util.splitext(name)
+        # if the user gave an extension use it.
+        if ext:
+            name = name + ext
+    if Verbose:
+        print " searching for '%s' with extensions: " % name,suffixes
+
+    for path in paths:
+        testName = os.path.join(path,name)
+        if Verbose:
+            print " look for '%s'" % testName
+        if os.path.exists(testName):
+            if Verbose:
+                print " found '%s'" % testName
+            return env.fs.File(testName)
+        else:
+            name_ext = SCons.Util.splitext(testName)[1]
+            if name_ext:
+                continue
+
+            # if no suffix try adding those passed in
+            for suffix in suffixes:
+                testNameExt = testName + suffix
+                if Verbose:
+                    print " look for '%s'" % testNameExt
+
+                if os.path.exists(testNameExt):
+                    if Verbose:
+                        print " found '%s'" % testNameExt
+                    return env.fs.File(testNameExt)
+    if Verbose:
+        print " did not find '%s'" % name
+    return None
+
+def InternalLaTeXAuxAction(XXXLaTeXAction, target = None, source= None, env=None):
+    """A builder for LaTeX files that checks the output in the aux file
+    and decides how many times to use LaTeXAction, and BibTeXAction."""
+
+    global must_rerun_latex
+
+    # This routine is called with two actions. In this file for DVI builds
+    # with LaTeXAction and from the pdflatex.py with PDFLaTeXAction
+    # set this up now for the case where the user requests a different extension
+    # for the target filename
+    if (XXXLaTeXAction == LaTeXAction):
+       callerSuffix = ".dvi"
+    else:
+       callerSuffix = env['PDFSUFFIX']
+
+    basename = SCons.Util.splitext(str(source[0]))[0]
+    basedir = os.path.split(str(source[0]))[0]
+    basefile = os.path.split(str(basename))[1]
+    abspath = os.path.abspath(basedir)
+
+    targetext = os.path.splitext(str(target[0]))[1]
+    targetdir = os.path.split(str(target[0]))[0]
+
+    saved_env = {}
+    for var in SCons.Scanner.LaTeX.LaTeX.env_variables:
+        saved_env[var] = modify_env_var(env, var, abspath)
+
+    # Create base file names with the target directory since the auxiliary files
+    # will be made there.   That's because the *COM variables have the cd
+    # command in the prolog. We check
+    # for the existence of files before opening them--even ones like the
+    # aux file that TeX always creates--to make it possible to write tests
+    # with stubs that don't necessarily generate all of the same files.
+
+    targetbase = os.path.join(targetdir, basefile)
+
+    # if there is a \makeindex there will be a .idx and thus
+    # we have to run makeindex at least once to keep the build
+    # happy even if there is no index.
+    # Same for glossaries and nomenclature
+    src_content = source[0].get_text_contents()
+    run_makeindex = makeindex_re.search(src_content) and not os.path.exists(targetbase + '.idx')
+    run_nomenclature = makenomenclature_re.search(src_content) and not os.path.exists(targetbase + '.nlo')
+    run_glossary = makeglossary_re.search(src_content) and not os.path.exists(targetbase + '.glo')
+    run_glossaries = makeglossaries_re.search(src_content) and not os.path.exists(targetbase + '.glo')
+    run_acronyms = makeacronyms_re.search(src_content) and not os.path.exists(targetbase + '.acn')
+
+    saved_hashes = {}
+    suffix_nodes = {}
+
+    for suffix in all_suffixes:
+        theNode = env.fs.File(targetbase + suffix)
+        suffix_nodes[suffix] = theNode
+        saved_hashes[suffix] = theNode.get_csig()
+
+    if Verbose:
+        print "hashes: ",saved_hashes
+
+    must_rerun_latex = True
+
+    #
+    # routine to update MD5 hash and compare
+    #
+    def check_MD5(filenode, suffix):
+        global must_rerun_latex
+        # two calls to clear old csig
+        filenode.clear_memoized_values()
+        filenode.ninfo = filenode.new_ninfo()
+        new_md5 = filenode.get_csig()
+
+        if saved_hashes[suffix] == new_md5:
+            if Verbose:
+                print "file %s not changed" % (targetbase+suffix)
+            return False        # unchanged
+        saved_hashes[suffix] = new_md5
+        must_rerun_latex = True
+        if Verbose:
+            print "file %s changed, rerunning Latex, new hash = " % (targetbase+suffix), new_md5
+        return True     # changed
+
+    # generate the file name that latex will generate
+    resultfilename = targetbase + callerSuffix
+
+    count = 0
+
+    while (must_rerun_latex and count < int(env.subst('$LATEXRETRIES'))) :
+        result = XXXLaTeXAction(target, source, env)
+        if result != 0:
+            return result
+
+        count = count + 1
+
+        must_rerun_latex = False
+        # Decide if various things need to be run, or run again.
+
+        # Read the log file to find warnings/errors
+        logfilename = targetbase + '.log'
+        logContent = ''
+        if os.path.exists(logfilename):
+            logContent = open(logfilename, "rb").read()
+
+
+        # Read the fls file to find all .aux files
+        flsfilename = targetbase + '.fls'
+        flsContent = ''
+        auxfiles = []
+        if os.path.exists(flsfilename):
+            flsContent = open(flsfilename, "rb").read()
+            auxfiles = openout_aux_re.findall(flsContent)
+        if Verbose:
+            print "auxfiles ",auxfiles
+
+        # Now decide if bibtex will need to be run.
+        # The information that bibtex reads from the .aux file is
+        # pass-independent. If we find (below) that the .bbl file is unchanged,
+        # then the last latex saw a correct bibliography.
+        # Therefore only do this on the first pass
+        if count == 1:
+            for auxfilename in auxfiles:
+                target_aux = os.path.join(targetdir, auxfilename)
+                if os.path.exists(target_aux):
+                    content = open(target_aux, "rb").read()
+                    if content.find("bibdata") != -1:
+                        if Verbose:
+                            print "Need to run bibtex"
+                        bibfile = env.fs.File(targetbase)
+                        result = BibTeXAction(bibfile, bibfile, env)
+                        if result != 0:
+                            check_file_error_message(env['BIBTEX'], 'blg')
+                            return result
+                        must_rerun_latex = check_MD5(suffix_nodes['.bbl'],'.bbl')
+                        break
+
+        # Now decide if latex will need to be run again due to index.
+        if check_MD5(suffix_nodes['.idx'],'.idx') or (count == 1 and run_makeindex):
+            # We must run makeindex
+            if Verbose:
+                print "Need to run makeindex"
+            idxfile = suffix_nodes['.idx']
+            result = MakeIndexAction(idxfile, idxfile, env)
+            if result != 0:
+                check_file_error_message(env['MAKEINDEX'], 'ilg')
+                return result
+
+        # TO-DO: need to add a way for the user to extend this list for whatever
+        # auxiliary files they create in other (or their own) packages
+        # Harder is case is where an action needs to be called -- that should be rare (I hope?)
+
+        for index in check_suffixes:
+            check_MD5(suffix_nodes[index],index)
+
+        # Now decide if latex will need to be run again due to nomenclature.
+        if check_MD5(suffix_nodes['.nlo'],'.nlo') or (count == 1 and run_nomenclature):
+            # We must run makeindex
+            if Verbose:
+                print "Need to run makeindex for nomenclature"
+            nclfile = suffix_nodes['.nlo']
+            result = MakeNclAction(nclfile, nclfile, env)
+            if result != 0:
+                check_file_error_message('%s (nomenclature)' % env['MAKENCL'],
+                                         'nlg')
+                #return result
+
+        # Now decide if latex will need to be run again due to glossary.
+        if check_MD5(suffix_nodes['.glo'],'.glo') or (count == 1 and run_glossaries) or (count == 1 and run_glossary):
+            # We must run makeindex
+            if Verbose:
+                print "Need to run makeindex for glossary"
+            glofile = suffix_nodes['.glo']
+            result = MakeGlossaryAction(glofile, glofile, env)
+            if result != 0:
+                check_file_error_message('%s (glossary)' % env['MAKEGLOSSARY'],
+                                         'glg')
+                #return result
+
+        # Now decide if latex will need to be run again due to acronyms.
+        if check_MD5(suffix_nodes['.acn'],'.acn') or (count == 1 and run_acronyms):
+            # We must run makeindex
+            if Verbose:
+                print "Need to run makeindex for acronyms"
+            acrfile = suffix_nodes['.acn']
+            result = MakeAcronymsAction(acrfile, acrfile, env)
+            if result != 0:
+                check_file_error_message('%s (acronyms)' % env['MAKEACRONYMS'],
+                                         'alg')
+                return result
+
+        # Now decide if latex needs to be run yet again to resolve warnings.
+        if warning_rerun_re.search(logContent):
+            must_rerun_latex = True
+            if Verbose:
+                print "rerun Latex due to latex or package rerun warning"
+
+        if rerun_citations_re.search(logContent):
+            must_rerun_latex = True
+            if Verbose:
+                print "rerun Latex due to 'Rerun to get citations correct' warning"
+
+        if undefined_references_re.search(logContent):
+            must_rerun_latex = True
+            if Verbose:
+                print "rerun Latex due to undefined references or citations"
+
+        if (count >= int(env.subst('$LATEXRETRIES')) and must_rerun_latex):
+            print "reached max number of retries on Latex ,",int(env.subst('$LATEXRETRIES'))
+# end of while loop
+
+    # rename Latex's output to what the target name is
+    if not (str(target[0]) == resultfilename  and  os.path.exists(resultfilename)):
+        if os.path.exists(resultfilename):
+            print "move %s to %s" % (resultfilename, str(target[0]), )
+            shutil.move(resultfilename,str(target[0]))
+
+    # Original comment (when TEXPICTS was not restored):
+    # The TEXPICTS enviroment variable is needed by a dvi -> pdf step
+    # later on Mac OSX so leave it
+    #
+    # It is also used when searching for pictures (implicit dependencies).
+    # Why not set the variable again in the respective builder instead
+    # of leaving local modifications in the environment? What if multiple
+    # latex builds in different directories need different TEXPICTS?
+    for var in SCons.Scanner.LaTeX.LaTeX.env_variables:
+        if var == 'TEXPICTS':
+            continue
+        if saved_env[var] is _null:
+            try:
+                del env['ENV'][var]
+            except KeyError:
+                pass # was never set
+        else:
+            env['ENV'][var] = saved_env[var]
+
+    return result
+
+def LaTeXAuxAction(target = None, source= None, env=None):
+    result = InternalLaTeXAuxAction( LaTeXAction, target, source, env )
+    return result
+
+LaTeX_re = re.compile("\\\\document(style|class)")
+
+def is_LaTeX(flist,env,abspath):
+    """Scan a file list to decide if it's TeX- or LaTeX-flavored."""
+
+    # We need to scan files that are included in case the
+    # \documentclass command is in them.
+
+    # get path list from both env['TEXINPUTS'] and env['ENV']['TEXINPUTS']
+    savedpath = modify_env_var(env, 'TEXINPUTS', abspath)
+    paths = env['ENV']['TEXINPUTS']
+    if SCons.Util.is_List(paths):
+        pass
+    else:
+        # Split at os.pathsep to convert into absolute path
+        paths = paths.split(os.pathsep)
+
+    # now that we have the path list restore the env
+    if savedpath is _null:
+        try:
+            del env['ENV']['TEXINPUTS']
+        except KeyError:
+            pass # was never set
+    else:
+        env['ENV']['TEXINPUTS'] = savedpath
+    if Verbose:
+        print "is_LaTeX search path ",paths
+        print "files to search :",flist
+
+    # Now that we have the search path and file list, check each one
+    for f in flist:
+        if Verbose:
+            print " checking for Latex source ",str(f)
+
+        content = f.get_text_contents()
+        if LaTeX_re.search(content):
+            if Verbose:
+                print "file %s is a LaTeX file" % str(f)
+            return 1
+        if Verbose:
+            print "file %s is not a LaTeX file" % str(f)
+
+        # now find included files
+        inc_files = [ ]
+        inc_files.extend( include_re.findall(content) )
+        if Verbose:
+            print "files included by '%s': "%str(f),inc_files
+        # inc_files is list of file names as given. need to find them
+        # using TEXINPUTS paths.
+
+        # search the included files
+        for src in inc_files:
+            srcNode = FindFile(src,['.tex','.ltx','.latex'],paths,env,requireExt=False)
+            # make this a list since is_LaTeX takes a list.
+            fileList = [srcNode,]
+            if Verbose:
+                print "FindFile found ",srcNode
+            if srcNode is not None:
+                file_test = is_LaTeX(fileList, env, abspath)
+
+            # return on first file that finds latex is needed.
+            if file_test:
+                return file_test
+
+        if Verbose:
+            print " done scanning ",str(f)
+
+    return 0
+
+def TeXLaTeXFunction(target = None, source= None, env=None):
+    """A builder for TeX and LaTeX that scans the source file to
+    decide the "flavor" of the source and then executes the appropriate
+    program."""
+
+    # find these paths for use in is_LaTeX to search for included files
+    basedir = os.path.split(str(source[0]))[0]
+    abspath = os.path.abspath(basedir)
+
+    if is_LaTeX(source,env,abspath):
+        result = LaTeXAuxAction(target,source,env)
+        if result != 0:
+            check_file_error_message(env['LATEX'])
+    else:
+        result = TeXAction(target,source,env)
+        if result != 0:
+            check_file_error_message(env['TEX'])
+    return result
+
+def TeXLaTeXStrFunction(target = None, source= None, env=None):
+    """A strfunction for TeX and LaTeX that scans the source file to
+    decide the "flavor" of the source and then returns the appropriate
+    command string."""
+    if env.GetOption("no_exec"):
+
+        # find these paths for use in is_LaTeX to search for included files
+        basedir = os.path.split(str(source[0]))[0]
+        abspath = os.path.abspath(basedir)
+
+        if is_LaTeX(source,env,abspath):
+            result = env.subst('$LATEXCOM',0,target,source)+" ..."
+        else:
+            result = env.subst("$TEXCOM",0,target,source)+" ..."
+    else:
+        result = ''
+    return result
+
+def tex_eps_emitter(target, source, env):
+    """An emitter for TeX and LaTeX sources when
+    executing tex or latex. It will accept .ps and .eps
+    graphics files
+    """
+    (target, source) = tex_emitter_core(target, source, env, TexGraphics)
+
+    return (target, source)
+
+def tex_pdf_emitter(target, source, env):
+    """An emitter for TeX and LaTeX sources when
+    executing pdftex or pdflatex. It will accept graphics
+    files of types .pdf, .jpg, .png, .gif, and .tif
+    """
+    (target, source) = tex_emitter_core(target, source, env, LatexGraphics)
+
+    return (target, source)
+
+def ScanFiles(theFile, target, paths, file_tests, file_tests_search, env, graphics_extensions, targetdir, aux_files):
+    """ For theFile (a Node) update any file_tests and search for graphics files
+    then find all included files and call ScanFiles recursively for each of them"""
+
+    content = theFile.get_text_contents()
+    if Verbose:
+        print " scanning ",str(theFile)
+
+    for i in range(len(file_tests_search)):
+        if file_tests[i][0] is None:
+            file_tests[i][0] = file_tests_search[i].search(content)
+
+    incResult = includeOnly_re.search(content)
+    if incResult:
+        aux_files.append(os.path.join(targetdir, incResult.group(1)))
+    if Verbose:
+        print "\include file names : ", aux_files
+    # recursively call this on each of the included files
+    inc_files = [ ]
+    inc_files.extend( include_re.findall(content) )
+    if Verbose:
+        print "files included by '%s': "%str(theFile),inc_files
+    # inc_files is list of file names as given. need to find them
+    # using TEXINPUTS paths.
+
+    for src in inc_files:
+        srcNode = FindFile(src,['.tex','.ltx','.latex'],paths,env,requireExt=False)
+        if srcNode is not None:
+            file_tests = ScanFiles(srcNode, target, paths, file_tests, file_tests_search, env, graphics_extensions, targetdir, aux_files)
+    if Verbose:
+        print " done scanning ",str(theFile)
+    return file_tests
+
+def tex_emitter_core(target, source, env, graphics_extensions):
+    """An emitter for TeX and LaTeX sources.
+    For LaTeX sources we try and find the common created files that
+    are needed on subsequent runs of latex to finish tables of contents,
+    bibliographies, indices, lists of figures, and hyperlink references.
+    """
+    basename = SCons.Util.splitext(str(source[0]))[0]
+    basefile = os.path.split(str(basename))[1]
+    targetdir = os.path.split(str(target[0]))[0]
+    targetbase = os.path.join(targetdir, basefile)
+
+    basedir = os.path.split(str(source[0]))[0]
+    abspath = os.path.abspath(basedir)
+    target[0].attributes.path = abspath
+    
+    #
+    # file names we will make use of in searching the sources and log file
+    #
+    emit_suffixes = ['.aux', '.log', '.ilg', '.blg', '.nls', '.nlg', '.gls', '.glg', '.alg'] + all_suffixes
+    auxfilename = targetbase + '.aux'
+    logfilename = targetbase + '.log'
+    flsfilename = targetbase + '.fls'
+
+    env.SideEffect(auxfilename,target[0])
+    env.SideEffect(logfilename,target[0])
+    env.SideEffect(flsfilename,target[0])
+    if Verbose:
+        print "side effect :",auxfilename,logfilename,flsfilename
+    env.Clean(target[0],auxfilename)
+    env.Clean(target[0],logfilename)
+    env.Clean(target[0],flsfilename)
+
+    content = source[0].get_text_contents()
+
+    idx_exists = os.path.exists(targetbase + '.idx')
+    nlo_exists = os.path.exists(targetbase + '.nlo')
+    glo_exists = os.path.exists(targetbase + '.glo')
+    acr_exists = os.path.exists(targetbase + '.acn')
+
+    # set up list with the regular expressions
+    # we use to find features used
+    file_tests_search = [auxfile_re,
+                         makeindex_re,
+                         bibliography_re,
+                         tableofcontents_re,
+                         listoffigures_re,
+                         listoftables_re,
+                         hyperref_re,
+                         makenomenclature_re,
+                         makeglossary_re,
+                         makeglossaries_re,
+                         makeacronyms_re,
+                         beamer_re ]
+    # set up list with the file suffixes that need emitting
+    # when a feature is found
+    file_tests_suff = [['.aux'],
+                  ['.idx', '.ind', '.ilg'],
+                  ['.bbl', '.blg'],
+                  ['.toc'],
+                  ['.lof'],
+                  ['.lot'],
+                  ['.out'],
+                  ['.nlo', '.nls', '.nlg'],
+                  ['.glo', '.gls', '.glg'],
+                  ['.glo', '.gls', '.glg'],
+                  ['.acn', '.acr', '.alg'],
+                  ['.nav', '.snm', '.out', '.toc'] ]
+    # build the list of lists
+    file_tests = []
+    for i in range(len(file_tests_search)):
+        file_tests.append( [None, file_tests_suff[i]] )
+
+    # TO-DO: need to add a way for the user to extend this list for whatever
+    # auxiliary files they create in other (or their own) packages
+
+    # get path list from both env['TEXINPUTS'] and env['ENV']['TEXINPUTS']
+    savedpath = modify_env_var(env, 'TEXINPUTS', abspath)
+    paths = env['ENV']['TEXINPUTS']
+    if SCons.Util.is_List(paths):
+        pass
+    else:
+        # Split at os.pathsep to convert into absolute path
+        paths = paths.split(os.pathsep)
+
+    # now that we have the path list restore the env
+    if savedpath is _null:
+        try:
+            del env['ENV']['TEXINPUTS']
+        except KeyError:
+            pass # was never set
+    else:
+        env['ENV']['TEXINPUTS'] = savedpath
+    if Verbose:
+        print "search path ",paths
+
+    aux_files = []
+    file_tests = ScanFiles(source[0], target, paths, file_tests, file_tests_search, env, graphics_extensions, targetdir, aux_files)
+
+    for (theSearch,suffix_list) in file_tests:
+        if theSearch:
+            for suffix in suffix_list:
+                env.SideEffect(targetbase + suffix,target[0])
+                if Verbose:
+                    print "side effect :",targetbase + suffix
+                env.Clean(target[0],targetbase + suffix)
+
+    for aFile in aux_files:
+        aFile_base = SCons.Util.splitext(aFile)[0]
+        env.SideEffect(aFile_base + '.aux',target[0])
+        if Verbose:
+            print "side effect :",aFile_base + '.aux'
+        env.Clean(target[0],aFile_base + '.aux')
+    # read fls file to get all other files that latex creates and will read on the next pass
+    # remove files from list that we explicitly dealt with above
+    if os.path.exists(flsfilename):
+        content = open(flsfilename, "rb").read()
+        out_files = openout_re.findall(content)
+        myfiles = [auxfilename, logfilename, flsfilename, targetbase+'.dvi',targetbase+'.pdf']
+        for filename in out_files[:]:
+            if filename in myfiles:
+                out_files.remove(filename)
+        env.SideEffect(out_files,target[0])
+        if Verbose:
+            print "side effect :",out_files
+        env.Clean(target[0],out_files)
+
+    return (target, source)
+
+
+TeXLaTeXAction = None
+
+def generate(env):
+    """Add Builders and construction variables for TeX to an Environment."""
+
+    global TeXLaTeXAction
+    if TeXLaTeXAction is None:
+        TeXLaTeXAction = SCons.Action.Action(TeXLaTeXFunction,
+                              strfunction=TeXLaTeXStrFunction)
+
+    env.AppendUnique(LATEXSUFFIXES=SCons.Tool.LaTeXSuffixes)
+
+    generate_common(env)
+
+    import dvi
+    dvi.generate(env)
+
+    bld = env['BUILDERS']['DVI']
+    bld.add_action('.tex', TeXLaTeXAction)
+    bld.add_emitter('.tex', tex_eps_emitter)
+
+def generate_common(env):
+    """Add internal Builders and construction variables for LaTeX to an Environment."""
+
+    # A generic tex file Action, sufficient for all tex files.
+    global TeXAction
+    if TeXAction is None:
+        TeXAction = SCons.Action.Action("$TEXCOM", "$TEXCOMSTR")
+
+    # An Action to build a latex file.  This might be needed more
+    # than once if we are dealing with labels and bibtex.
+    global LaTeXAction
+    if LaTeXAction is None:
+        LaTeXAction = SCons.Action.Action("$LATEXCOM", "$LATEXCOMSTR")
+
+    # Define an action to run BibTeX on a file.
+    global BibTeXAction
+    if BibTeXAction is None:
+        BibTeXAction = SCons.Action.Action("$BIBTEXCOM", "$BIBTEXCOMSTR")
+
+    # Define an action to run MakeIndex on a file.
+    global MakeIndexAction
+    if MakeIndexAction is None:
+        MakeIndexAction = SCons.Action.Action("$MAKEINDEXCOM", "$MAKEINDEXCOMSTR")
+
+    # Define an action to run MakeIndex on a file for nomenclatures.
+    global MakeNclAction
+    if MakeNclAction is None:
+        MakeNclAction = SCons.Action.Action("$MAKENCLCOM", "$MAKENCLCOMSTR")
+
+    # Define an action to run MakeIndex on a file for glossaries.
+    global MakeGlossaryAction
+    if MakeGlossaryAction is None:
+        MakeGlossaryAction = SCons.Action.Action("$MAKEGLOSSARYCOM", "$MAKEGLOSSARYCOMSTR")
+
+    # Define an action to run MakeIndex on a file for acronyms.
+    global MakeAcronymsAction
+    if MakeAcronymsAction is None:
+        MakeAcronymsAction = SCons.Action.Action("$MAKEACRONYMSCOM", "$MAKEACRONYMSCOMSTR")
+
+    CDCOM = 'cd '
+    if platform.system() == 'Windows':
+        # allow cd command to change drives on Windows
+        CDCOM = 'cd /D '
+
+    env['TEX']      = 'tex'
+    env['TEXFLAGS'] = SCons.Util.CLVar('-interaction=nonstopmode -recorder')
+    env['TEXCOM']   = CDCOM + '${TARGET.dir} && $TEX $TEXFLAGS ${SOURCE.file}'
+
+    env['PDFTEX']      = 'pdftex'
+    env['PDFTEXFLAGS'] = SCons.Util.CLVar('-interaction=nonstopmode -recorder')
+    env['PDFTEXCOM']   = CDCOM + '${TARGET.dir} && $PDFTEX $PDFTEXFLAGS ${SOURCE.file}'
+
+    env['LATEX']        = 'latex'
+    env['LATEXFLAGS']   = SCons.Util.CLVar('-interaction=nonstopmode -recorder')
+    env['LATEXCOM']     = CDCOM + '${TARGET.dir} && $LATEX $LATEXFLAGS ${SOURCE.file}'
+    env['LATEXRETRIES'] = 3
+
+    env['PDFLATEX']      = 'pdflatex'
+    env['PDFLATEXFLAGS'] = SCons.Util.CLVar('-interaction=nonstopmode -recorder')
+    env['PDFLATEXCOM']   = CDCOM + '${TARGET.dir} && $PDFLATEX $PDFLATEXFLAGS ${SOURCE.file}'
+
+    env['BIBTEX']      = 'bibtex'
+    env['BIBTEXFLAGS'] = SCons.Util.CLVar('')
+    env['BIBTEXCOM']   = CDCOM + '${TARGET.dir} && $BIBTEX $BIBTEXFLAGS ${SOURCE.filebase}'
+
+    env['MAKEINDEX']      = 'makeindex'
+    env['MAKEINDEXFLAGS'] = SCons.Util.CLVar('')
+    env['MAKEINDEXCOM']   = CDCOM + '${TARGET.dir} && $MAKEINDEX $MAKEINDEXFLAGS ${SOURCE.file}'
+
+    env['MAKEGLOSSARY']      = 'makeindex'
+    env['MAKEGLOSSARYSTYLE'] = '${SOURCE.filebase}.ist'
+    env['MAKEGLOSSARYFLAGS'] = SCons.Util.CLVar('-s ${MAKEGLOSSARYSTYLE} -t ${SOURCE.filebase}.glg')
+    env['MAKEGLOSSARYCOM']   = CDCOM + '${TARGET.dir} && $MAKEGLOSSARY ${SOURCE.filebase}.glo $MAKEGLOSSARYFLAGS -o ${SOURCE.filebase}.gls'
+
+    env['MAKEACRONYMS']      = 'makeindex'
+    env['MAKEACRONYMSSTYLE'] = '${SOURCE.filebase}.ist'
+    env['MAKEACRONYMSFLAGS'] = SCons.Util.CLVar('-s ${MAKEACRONYMSSTYLE} -t ${SOURCE.filebase}.alg')
+    env['MAKEACRONYMSCOM']   = CDCOM + '${TARGET.dir} && $MAKEACRONYMS ${SOURCE.filebase}.acn $MAKEACRONYMSFLAGS -o ${SOURCE.filebase}.acr'
+
+    env['MAKENCL']      = 'makeindex'
+    env['MAKENCLSTYLE'] = 'nomencl.ist'
+    env['MAKENCLFLAGS'] = '-s ${MAKENCLSTYLE} -t ${SOURCE.filebase}.nlg'
+    env['MAKENCLCOM']   = CDCOM + '${TARGET.dir} && $MAKENCL ${SOURCE.filebase}.nlo $MAKENCLFLAGS -o ${SOURCE.filebase}.nls'
+
+def exists(env):
+    return env.Detect('tex')
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: