#!/usr/bin/env python

import os,shutil, string, re
from distutils.sysconfig import parse_makefile
import sys
import logging, time
import types
sys.path.insert(0, os.path.abspath(os.path.dirname(__file__)))
from cmakegen import Mistakes, stripsplit, AUTODIRS, SKIPDIRS
from cmakegen import defaultdict # collections.defaultdict, with fallback for python-2.4
from gmakegen import *

import inspect
thisscriptdir = os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe())))
sys.path.insert(0,thisscriptdir) 
import testparse
import example_template

class generateExamples(Petsc):
  """
    gmakegen.py has basic structure for finding the files, writing out
      the dependencies, etc.
  """
  def __init__(self,petsc_dir=None, petsc_arch=None, testdir=None, verbose=False, single_ex=False, srcdir=None):
    super(generateExamples, self).__init__(petsc_dir, petsc_arch, verbose)

    self.single_ex=single_ex

    # Set locations to handle movement
    self.inInstallDir=self.getInInstallDir(thisscriptdir)
    if not self.inInstallDir:
      self.arch_dir=os.path.join(self.petsc_dir,self.petsc_arch)
      self.srcdir=os.path.join(self.petsc_dir,'src')
    else:
      # set PETSC_ARCH to install directory to allow script to work in both
      dirlist=thisscriptdir.split(os.path.sep)
      installdir=os.path.sep.join(dirlist[0:len(dirlist)-4])
      self.arch_dir=installdir
      self.srcdir=os.path.join(os.path.dirname(thisscriptdir),'src')

    # Do some initialization
    if testdir:
      # If full path given, then use it, otherwise assume relative to arch_dir
      if testdir.strip().startswith(os.path.sep):
        self.testroot_dir=testdir.strip()
      else:
        self.testroot_dir=os.path.join(self.arch_dir,testdir.strip())
    else:
      self.testroot_dir=os.path.join(self.arch_dir,"tests")

    self.ptNaming=True
    self.verbose=verbose
    # Whether to write out a useful debugging
    self.summarize=True if verbose else False

    # For help in setting the requirements
    self.precision_types="single double __float128 int32".split()
    self.integer_types="int32 int64".split()
    self.languages="fortran cuda cxx".split()    # Always requires C so do not list

    # Things that are not test
    self.buildkeys=testparse.buildkeys

    # Adding a dictionary for storing sources, objects, and tests
    # to make building the dependency tree easier
    self.sources={}
    self.objects={}
    self.tests={}
    for pkg in PKGS:
      self.sources[pkg]={}
      self.objects[pkg]=[]
      self.tests[pkg]={}
      for lang in LANGS:
        self.sources[pkg][lang]={}
        self.sources[pkg][lang]['srcs']=[]
        self.tests[pkg][lang]={}

    if not os.path.isdir(self.testroot_dir): os.makedirs(self.testroot_dir)

    self.indent="   "
    if self.verbose: print('Finishing the constructor')
    return

  def srcrelpath(self,rdir):
    """
    Get relative path to source directory
    """
    return os.path.join('src',os.path.relpath(rdir,self.srcdir))

  def getInInstallDir(self,thisscriptdir):
    """
    When petsc is installed then this file in installed in:
         <PREFIX>/share/petsc/examples/config/gmakegentest.py
    otherwise the path is:
         <PETSC_DIR>/config/gmakegentest.py
    We use this difference to determine if we are in installdir
    """
    dirlist=thisscriptdir.split(os.path.sep)
    if len(dirlist)>4:
      lastfour=os.path.sep.join(dirlist[len(dirlist)-4:])
      if lastfour==os.path.join('share','petsc','examples','config'):
        return True
      else:
        return False
    else:
      return False

  def nameSpace(self,srcfile,srcdir):
    """
    Because the scripts have a non-unique naming, the pretty-printing
    needs to convey the srcdir and srcfile.  There are two ways of doing this.
    """
    if self.ptNaming:
      cdir=srcdir.split('src')[1].lstrip("/").rstrip("/")
      prefix=cdir.replace('/examples/','_').replace("/","_")+"-"
      nameString=prefix+srcfile
    else:
      #nameString=srcdir+": "+srcfile
      nameString=srcfile
    return nameString

  def getLanguage(self,srcfile):
    """
    Based on the source, determine associated language as found in gmakegen.LANGS
    Can we just return srcext[1:\] now?
    """
    langReq=None
    srcext=os.path.splitext(srcfile)[-1]
    if srcext in ".F90".split(): langReq="F90"
    if srcext in ".F".split(): langReq="F"
    if srcext in ".cxx".split(): langReq="cxx"
    if srcext == ".cu": langReq="cu"
    if srcext == ".c": langReq="c"
    #if not langReq: print "ERROR: ", srcext, srcfile
    return langReq

  def _getLoopVars(self,inDict,testname, isSubtest=False):
    """
    Given: 'args: -bs {{1 2 3 4 5}} -pc_type {{cholesky sor}} -ksp_monitor'
    Return: 
      inDict['args']: -ksp_monitor
      inDict['subargs']: -bs ${bs} -pc_type ${pc_type}
      loopVars['subargs']['varlist']=['bs' 'pc_type']   # Don't worry about OrderedDict
      loopVars['subargs']['bs']=[["bs"],["1 2 3 4 5"]]
      loopVars['subargs']['pc_type']=[["pc_type"],["cholesky sor"]]
    subst should be passed in instead of inDict
    """
    loopVars={}; newargs=""
    lkeys=inDict.keys()
    lsuffix='_'
    from testparse import parseLoopArgs
    for key in lkeys:
      if type(inDict[key])!=types.StringType: continue
      keystr = str(inDict[key])
      akey=('subargs' if key=='args' else key)  # what to assign
      if akey not in inDict: inDict[akey]=''
      varlist=[]
      for varset in re.split('-(?=[a-zA-Z])',keystr):
        if not varset.strip(): continue
        if '{{' in varset:
          keyvar,lvars,ftype=parseLoopArgs(varset)
          if akey not in loopVars: loopVars[akey]={}
          varlist.append(keyvar)
          loopVars[akey][keyvar]=[keyvar,lvars]
          if akey=='nsize':
            inDict[akey] = '${' + keyvar + '}'
            lsuffix+=akey+'-'+inDict[akey]+'_'
          else:
            inDict[akey] += ' -'+keyvar+' ${' + keyvar + '}'
            lsuffix+=keyvar+'-${' + keyvar + '}_'
        else:
          if key=='args': newargs+=" -"+varset.strip()
        if varlist: loopVars[akey]['varlist']=varlist

      
    # For subtests, args are always substituted in (not top level)
    if isSubtest:
      inDict['subargs']+=" "+newargs.strip()
      inDict['args']=''
      if 'label_suffix' in inDict:
        inDict['label_suffix']+=lsuffix.rstrip('_')
      else:
        inDict['label_suffix']=lsuffix.rstrip('_')
    else:
      if loopVars.keys(): 
        inDict['args']=newargs.strip()
        inDict['label_suffix']=lsuffix.rstrip('_')
    if loopVars.keys():
      return loopVars
    else:
      return None

  def getArgLabel(self,testDict):
    """
    In all of the arguments in the test dictionary, create a simple
    string for searching within the makefile system.  For simplicity in
    search, remove "-", for strings, etc.
    Also, concatenate the arg commands
    For now, ignore nsize -- seems hard to search for anyway
    """
    # Collect all of the args associated with a test
    argStr=("" if 'args' not in testDict else testDict['args'])
    if 'subtests' in testDict:
      for stest in testDict["subtests"]:
         sd=testDict[stest]
         argStr=argStr+("" if 'args' not in sd else sd['args'])

    # Now go through and cleanup
    argStr=re.sub('{{(.*?)}}',"",argStr)
    argStr=re.sub('-'," ",argStr)
    for digit in string.digits: argStr=re.sub(digit," ",argStr)
    argStr=re.sub("\.","",argStr)
    argStr=re.sub(",","",argStr)
    argStr=re.sub('\+',' ',argStr)
    argStr=re.sub(' +',' ',argStr)  # Remove repeated white space
    return argStr.strip()

  def addToSources(self,exfile,root,srcDict):
    """
      Put into data structure that allows easy generation of makefile
    """
    rpath=self.srcrelpath(root)
    pkg=rpath.split(os.path.sep)[1]
    relpfile=os.path.join(rpath,exfile)
    lang=self.getLanguage(exfile)
    if not lang: return
    self.sources[pkg][lang]['srcs'].append(relpfile)
    if 'depends' in srcDict:
      depSrc=srcDict['depends']
      depObj=os.path.splitext(depSrc)[0]+".o"
      self.sources[pkg][lang][relpfile]=os.path.join(rpath,depObj)

    # In gmakefile, ${TESTDIR} var specifies the object compilation
    testsdir=self.srcrelpath(root)+"/"
    objfile="${TESTDIR}/"+testsdir+os.path.splitext(exfile)[0]+".o"
    self.objects[pkg].append(objfile)
    return

  def addToTests(self,test,root,exfile,execname,testDict):
    """
      Put into data structure that allows easy generation of makefile
      Organized by languages to allow testing of languages
    """
    rpath=self.srcrelpath(root)
    pkg=rpath.split("/")[1]
    #nmtest=self.nameSpace(test,root)
    nmtest=os.path.join(rpath,test)
    lang=self.getLanguage(exfile)
    if not lang: return
    self.tests[pkg][lang][nmtest]={}
    self.tests[pkg][lang][nmtest]['exfile']=os.path.join(rpath,exfile)
    self.tests[pkg][lang][nmtest]['exec']=execname
    self.tests[pkg][lang][nmtest]['argLabel']=self.getArgLabel(testDict)
    return

  def getExecname(self,exfile,root):
    """
      Generate bash script using template found next to this file.  
      This file is read in at constructor time to avoid file I/O
    """
    rpath=self.srcrelpath(root)
    if self.single_ex:
      execname=rpath.split("/")[1]+"-ex"
    else:
      execname=os.path.splitext(exfile)[0]
    return execname

  def getSubstVars(self,testDict,rpath,testname):
    """
      Create a dictionary with all of the variables that get substituted
      into the template commands found in example_template.py
    """
    subst={}

    # Handle defaults of testparse.acceptedkeys (e.g., ignores subtests)
    if 'nsize' not in testDict: testDict['nsize']=1
    if 'timeoutfactor' not in testDict: testDict['timeoutfactor']="1"
    for ak in testparse.acceptedkeys: 
      if ak=='test': continue
      subst[ak]=(testDict[ak] if ak in testDict else '')

    # Now do other variables
    subst['execname']=testDict['execname']
    if 'filter' in testDict:
      subst['filter']="'"+testDict['filter']+"'"   # Quotes are tricky - overwrite

    # Others
    subst['subargs']=''  # Default.  For variables override
    subst['srcdir']=os.path.join(os.path.dirname(self.srcdir),rpath)
    subst['label_suffix']=''
    subst['comments']="\n#".join(subst['comments'].split("\n"))
    if subst['comments']: subst['comments']="#"+subst['comments']
    subst['exec']="../"+subst['execname']
    subst['testroot']=self.testroot_dir
    subst['testname']=testname
    dp = self.conf.get('DATAFILESPATH','')
    subst['datafilespath_line'] = 'DATAFILESPATH=${DATAFILESPATH:-"'+dp+'"}'

    # This is used to label some matrices
    subst['petsc_index_size']=str(self.conf['PETSC_INDEX_SIZE'])
    subst['petsc_scalar_size']=str(self.conf['PETSC_SCALAR_SIZE'])

    # These can have for loops and are treated separately later
    subst['nsize']=str(subst['nsize'])

    #Conf vars
    if self.petsc_arch.find('valgrind')>=0:
      subst['mpiexec']='petsc_mpiexec_valgrind ' + self.conf['MPIEXEC']
    else:
      subst['mpiexec']=self.conf['MPIEXEC']
    subst['petsc_dir']=self.petsc_dir # not self.conf['PETSC_DIR'] as this could be windows path
    subst['petsc_arch']=self.petsc_arch
    if not self.inInstallDir:
      subst['CONFIG_DIR']=os.path.join(self.petsc_dir,'config')
      subst['PETSC_BINDIR']=os.path.join(self.petsc_dir,'bin')
    else:
      subst['CONFIG_DIR']=os.path.join(os.path.dirname(self.srcdir),'config')
      subst['PETSC_BINDIR']=os.path.join(self.petsc_dir,self.petsc_arch,'bin')
    subst['diff']=self.conf['DIFF']
    subst['rm']=self.conf['RM']
    subst['grep']=self.conf['GREP']
    subst['petsc_lib_dir']=self.conf['PETSC_LIB_DIR']
    subst['wpetsc_dir']=self.conf['wPETSC_DIR']

    # Output file is special because of subtests override
    defroot=(re.sub("run","",testname) if testname.startswith("run") else testname)
    if not "_" in defroot: defroot=defroot+"_1"
    subst['defroot']=defroot
    subst['label']=self.nameSpace(defroot,subst['srcdir'])
    subst['redirect_file']=defroot+".tmp"
    if 'output_file' not in testDict: 
      subst['output_file']="output/"+defroot+".out"
    # Add in the full path here.
    subst['output_file']=os.path.join(subst['srcdir'],subst['output_file'])
    if not os.path.isfile(os.path.join(self.petsc_dir,subst['output_file'])):
      if not subst['TODO']:
        print "Warning: "+subst['output_file']+" not found."
    # Worry about alt files here -- see
    #   src/snes/examples/tutorials/output/ex22*.out
    altlist=[subst['output_file']]
    for i in range(1,3):
      altroot=defroot+"_alt"
      if i==2: altroot=altroot+"_2"
      af="output/"+altroot+".out"
      srcaf=os.path.join(subst['srcdir'],af)
      fullaf=os.path.join(self.petsc_dir,srcaf)
      if os.path.isfile(fullaf): altlist.append(srcaf)
    if len(altlist)>1: subst['altfiles']=altlist
    #if len(altlist)>1: print "Found alt files: ",altlist

    return subst

  def getCmds(self,subst,i):
    """
      Generate bash script using template found next to this file.  
      This file is read in at constructor time to avoid file I/O
    """
    nindnt=i # the start and has to be consistent with below
    cmdindnt=self.indent*nindnt
    cmdLines=""

    # MPI is the default -- but we have a few odd commands
    if not subst['command']:
      cmd=cmdindnt+self._substVars(subst,example_template.mpitest)
    else:
      cmd=cmdindnt+self._substVars(subst,example_template.commandtest)
    cmdLines+=cmd+"\n"+cmdindnt+"res=$?\n\n"

    cmdLines+=cmdindnt+'if test $res = 0; then\n'
    diffindnt=self.indent*(nindnt+1)
    if not subst['filter_output']:
      if 'altfiles' not in subst:
        cmd=diffindnt+self._substVars(subst,example_template.difftest)
      else:
        # Have to do it by hand a bit because of variable number of alt files
        rf=subst['redirect_file']
        cmd=diffindnt+example_template.difftest.split('@')[0]
        for i in range(len(subst['altfiles'])):
          af=subst['altfiles'][i]
          cmd+=af+' '+rf+' > diff-${testname}-'+str(i)+'.out 2> diff-${testname}-'+str(i)+'.out'
          if i!=len(subst['altfiles'])-1:
            cmd+=' || ${diff_exe} '
          else:
            cmd+='" diff-${testname}.out diff-${testname}.out diff-${label}'
            cmd+=subst['label_suffix']+' ""'  # Quotes are painful
    else:
      cmd=diffindnt+self._substVars(subst,example_template.filterdifftest)
    cmdLines+=cmd+"\n"
    cmdLines+=cmdindnt+'else\n'
    cmdLines+=diffindnt+'printf "ok ${label} # SKIP Command failed so no diff\\n"\n'
    cmdLines+=cmdindnt+'fi\n'
    return cmdLines

  def _substVars(self,subst,origStr):
    """
      Substitute variables
    """
    Str=origStr
    for subkey in subst:
      if type(subst[subkey])!=types.StringType: continue
      patt="@"+subkey.upper()+"@"
      Str=re.sub(patt,subst[subkey],Str)
    return Str

  def _writeTodoSkip(self,fh,tors,reasons,footer):
    """
    Write out the TODO and SKIP lines in the file
    The TODO or SKIP variable, tors, should be lower case
    """
    TORS=tors.upper()
    template=eval("example_template."+tors+"line")
    tsStr=re.sub("@"+TORS+"COMMENT@",', '.join(reasons),template)
    tab = ''
    if reasons:
      fh.write('if ! $force; then\n')
      tab = tab + '    '
    if reasons == ["Requires DATAFILESPATH"]:
      # The only reason not to run is DATAFILESPATH, which we check at run-time
      fh.write(tab + 'if test -z "${DATAFILESPATH}"; then\n')
      tab = tab + '    '
    if reasons:
      fh.write(tab+tsStr+"\n" + tab + "total=1; "+tors+"=1\n")
      fh.write(tab+footer+"\n")
      fh.write(tab+"exit\n")
    if reasons == ["Requires DATAFILESPATH"]:
      fh.write('    fi\n')
    if reasons:
      fh.write('fi\n')
    fh.write('\n\n')
    return

  def getLoopVarsHead(self,loopVars,i):
    """
    Generate a nicely indented string with the format loops
    Here is what the data structure looks like
      loopVars['subargs']['varlist']=['bs' 'pc_type']   # Don't worry about OrderedDict
      loopVars['subargs']['bs']=["i","1 2 3 4 5"]
      loopVars['subargs']['pc_type']=["j","cholesky sor"]
    """
    outstr=''; indnt=self.indent
    for key in loopVars:
      for var in loopVars[key]['varlist']:
        varval=loopVars[key][var]
        outstr += indnt * i + "for "+varval[0]+" in "+varval[1]+"; do\n"
        i = i + 1
    return (outstr,i)

  def getLoopVarsFoot(self,loopVars,i):
    outstr=''; indnt=self.indent
    for key in loopVars:
      for var in loopVars[key]['varlist']:
        i = i - 1
        outstr += indnt * i + "done\n"
    return (outstr,i)

  def genRunScript(self,testname,root,isRun,srcDict):
    """
      Generate bash script using template found next to this file.  
      This file is read in at constructor time to avoid file I/O
    """
    # runscript_dir directory has to be consistent with gmakefile
    testDict=srcDict[testname]
    rpath=self.srcrelpath(root)
    runscript_dir=os.path.join(self.testroot_dir,rpath)
    if not os.path.isdir(runscript_dir): os.makedirs(runscript_dir)
    fh=open(os.path.join(runscript_dir,testname+".sh"),"w")

    # Get variables to go into shell scripts.  last time testDict used
    subst=self.getSubstVars(testDict,rpath,testname)
    loopVars = self._getLoopVars(subst,testname)  # Alters subst as well
    #if '33_' in testname: print subst['subargs']

    #Handle runfiles
    for lfile in subst.get('localrunfiles','').split():
      fullfile=os.path.join(root,lfile)
      shutil.copy(fullfile,runscript_dir)
    # Check subtests for local runfiles
    for stest in subst.get("subtests",[]):
      for lfile in testDict[stest].get('localrunfiles','').split():
        fullfile=os.path.join(root,lfile)
        shutil.copy(fullfile,self.runscript_dir)

    # Now substitute the key variables into the header and footer
    header=self._substVars(subst,example_template.header)
    # The header is done twice to enable @...@ in header
    header=self._substVars(subst,header)
    footer=re.sub('@TESTROOT@',subst['testroot'],example_template.footer)

    # Start writing the file
    fh.write(header+"\n")

    # If there is a TODO or a SKIP then we do it before writing out the
    # rest of the command (which is useful for working on the test)
    # SKIP and TODO can be for the source file or for the runs
    self._writeTodoSkip(fh,'todo',[s for s in [srcDict.get('TODO',''), testDict.get('TODO','')] if s],footer)
    self._writeTodoSkip(fh,'skip',srcDict.get('SKIP',[]) + testDict.get('SKIP',[]),footer)

    j=0  # for indentation 

    if loopVars:
      (loopHead,j) = self.getLoopVarsHead(loopVars,j)
      if (loopHead): fh.write(loopHead+"\n")

    # Subtests are special
    if 'subtests' in testDict:
      substP=subst   # Subtests can inherit args but be careful
      k=0  # for label suffixes
      for stest in testDict["subtests"]:
        subst=substP.copy()
        subst.update(testDict[stest])
        # nsize is special because it is usually overwritten
        if 'nsize' in testDict[stest]:
          fh.write("nsize="+str(testDict[stest]['nsize'])+"\n")
        else:
          fh.write("nsize=1\n")
        subst['label_suffix']='-'+string.ascii_letters[k]; k+=1
        sLoopVars = self._getLoopVars(subst,testname,isSubtest=True)
        #if '10_9' in testname: print sLoopVars
        if sLoopVars: 
          (sLoopHead,j) = self.getLoopVarsHead(sLoopVars,j)
          fh.write(sLoopHead+"\n")
        fh.write(self.getCmds(subst,j)+"\n")
        if sLoopVars: 
          (sLoopFoot,j) = self.getLoopVarsFoot(sLoopVars,j)
          fh.write(sLoopFoot+"\n")
    else:
      fh.write(self.getCmds(subst,j)+"\n")

    if loopVars: 
      (loopFoot,j) = self.getLoopVarsFoot(loopVars,j)
      fh.write(loopFoot+"\n")

    fh.write(footer+"\n")
    os.chmod(os.path.join(runscript_dir,testname+".sh"),0755)
    #if '10_9' in testname: sys.exit()
    return

  def  genScriptsAndInfo(self,exfile,root,srcDict):
    """
    Generate scripts from the source file, determine if built, etc.
     For every test in the exfile with info in the srcDict:
      1. Determine if it needs to be run for this arch
      2. Generate the script
      3. Generate the data needed to write out the makefile in a
         convenient way
     All tests are *always* run, but some may be SKIP'd per the TAP standard
    """
    debug=False
    execname=self.getExecname(exfile,root)
    isBuilt=self._isBuilt(exfile,srcDict)
    for test in srcDict:
      if test in self.buildkeys: continue
      if debug: print self.nameSpace(exfile,root), test
      srcDict[test]['execname']=execname   # Convenience in generating scripts
      isRun=self._isRun(srcDict[test])
      self.genRunScript(test,root,isRun,srcDict)
      srcDict[test]['isrun']=isRun
      self.addToTests(test,root,exfile,execname,srcDict[test])

    # This adds to datastructure for building deps
    if isBuilt: self.addToSources(exfile,root,srcDict)
    return

  def _isBuilt(self,exfile,srcDict):
    """
    Determine if this file should be built. 
    """
    # Get the language based on file extension
    srcDict['SKIP'] = []
    lang=self.getLanguage(exfile)
    if (lang=="F" or lang=="F90"): 
      if not self.have_fortran: 
        srcDict["SKIP"].append("Fortran required for this test")
      elif lang=="F90" and 'PETSC_USING_F90FREEFORM' not in self.conf: 
        srcDict["SKIP"].append("Fortran f90freeform required for this test")
    if lang=="cu" and 'PETSC_HAVE_CUDA' not in self.conf: 
      srcDict["SKIP"].append("CUDA required for this test")
    if lang=="cxx" and 'PETSC_HAVE_CXX' not in self.conf: 
      srcDict["SKIP"].append("C++ required for this test")

    # Deprecated source files
    if srcDict.get("TODO"):
      return False

    # isRun can work with srcDict to handle the requires
    if "requires" in srcDict: 
      if srcDict["requires"]: 
        return self._isRun(srcDict)

    return srcDict['SKIP'] == []


  def _isRun(self,testDict):
    """
    Based on the requirements listed in the src file and the petscconf.h
    info, determine whether this test should be run or not.
    """
    indent="  "
    debug=False

    if 'SKIP' not in testDict:
      testDict['SKIP'] = []
    # MPI requirements
    if testDict.get('nsize',1)>1 and 'MPI_IS_MPIUNI' in self.conf:
      if debug: print indent+"Cannot run parallel tests"
      testDict['SKIP'].append("Parallel test with serial build")
 
    # The requirements for the test are the sum of all the run subtests
    if 'subtests' in testDict:
      if 'requires' not in testDict: testDict['requires']=""
      for stest in testDict['subtests']:
        if 'requires' in testDict[stest]:
          testDict['requires']+=" "+testDict[stest]['requires']


    # Now go through all requirements
    if 'requires' in testDict:
      for requirement in testDict['requires'].split():
        requirement=requirement.strip()
        if not requirement: continue
        if debug: print indent+"Requirement: ", requirement
        isNull=False
        if requirement.startswith("!"):
          requirement=requirement[1:]; isNull=True
        # Precision requirement for reals
        if requirement in self.precision_types:
          if self.conf['PETSC_PRECISION']==requirement:
            if isNull:
              testDict['SKIP'].append("not "+requirement+" required")
              continue
            continue  # Success
          elif not isNull:
            testDict['SKIP'].append(requirement+" required")
            continue
        # Precision requirement for ints
        if requirement in self.integer_types:
          if requirement=="int32":
            if self.conf['PETSC_SIZEOF_INT']==4:
              if isNull:
                testDict['SKIP'].append("not int32 required")
                continue
              continue  # Success
            elif not isNull:
              testDict['SKIP'].append("int32 required")
              continue
          if requirement=="int64":
            if self.conf['PETSC_SIZEOF_INT']==8:
              if isNull:
                testDict['SKIP'].append("NOT int64 required")
                continue
              continue  # Success
            elif not isNull:
              testDict['SKIP'].append("int64 required")
              continue
        # Datafilespath
        if requirement=="datafilespath" and not isNull:
          testDict['SKIP'].append("Requires DATAFILESPATH")
          continue
        # Defines -- not sure I have comments matching
        if "define(" in requirement.lower():
          reqdef=requirement.split("(")[1].split(")")[0]
          if reqdef in self.conf:
            if isNull:
              testDict['SKIP'].append("Null requirement not met: "+requirement)
              continue
            continue  # Success
          elif not isNull:
            testDict['SKIP'].append("Required: "+requirement)
            continue

        # Rest should be packages that we can just get from conf
        if requirement == "complex":
          petscconfvar="PETSC_USE_COMPLEX"
        else:
          petscconfvar="PETSC_HAVE_"+requirement.upper()
        if self.conf.get(petscconfvar):
          if isNull:
            testDict['SKIP'].append("Not "+petscconfvar+" requirement not met")
            continue
          continue  # Success
        elif not isNull:
          if debug: print "requirement not found: ", requirement
          testDict['SKIP'].append(petscconfvar+" requirement not met")
          continue

    return testDict['SKIP'] == []

  def genPetscTests_summarize(self,dataDict):
    """
    Required method to state what happened
    """
    if not self.summarize: return
    indent="   "
    print(self.testroot_dir, os.path.realpath(os.curdir))
    fhname=os.path.join(self.testroot_dir,'GenPetscTests_summarize.txt')
    fh=open(fhname,"w")
    #print "See ", fhname
    for root in dataDict:
      relroot=self.srcrelpath(root)
      pkg=relroot.split("/")[1]
      fh.write(relroot+"\n")
      allSrcs=[]
      for lang in LANGS: allSrcs+=self.sources[pkg][lang]['srcs']
      for exfile in dataDict[root]:
        # Basic  information
        rfile=os.path.join(relroot,exfile)
        builtStatus=(" Is built" if rfile in allSrcs else " Is NOT built")
        fh.write(indent+exfile+indent*4+builtStatus+"\n")

        for test in dataDict[root][exfile]:
          if test in self.buildkeys: continue
          line=indent*2+test
          fh.write(line+"\n")
          # Looks nice to have the keys in order
          #for key in dataDict[root][exfile][test]:
          for key in "isrun abstracted nsize args requires script".split():
            if key not in dataDict[root][exfile][test]: continue
            line=indent*3+key+": "+str(dataDict[root][exfile][test][key])
            fh.write(line+"\n")
          fh.write("\n")
        fh.write("\n")
      fh.write("\n")
    #fh.write("\nClass Sources\n"+str(self.sources)+"\n")
    #fh.write("\nClass Tests\n"+str(self.tests)+"\n")
    fh.close()
    return

  def genPetscTests(self,root,dirs,files,dataDict):
    """
     Go through and parse the source files in the directory to generate
     the examples based on the metadata contained in the source files
    """
    debug=False
    # Use examplesAnalyze to get what the makefles think are sources
    #self.examplesAnalyze(root,dirs,files,anlzDict)

    dataDict[root]={}

    for exfile in files:
      #TST: Until we replace files, still leaving the orginals as is
      #if not exfile.startswith("new_"+"ex"): continue
      #if not exfile.startswith("ex"): continue

      # Ignore emacs files
      if exfile.startswith("#") or exfile.startswith(".#"): continue

      # Convenience
      fullex=os.path.join(root,exfile)
      if self.verbose: print('   --> '+fullex)
      dataDict[root].update(testparse.parseTestFile(fullex,0))
      if exfile in dataDict[root]:
        self.genScriptsAndInfo(exfile,root,dataDict[root][exfile])

    return

  def walktree(self,top):
    """
    Walk a directory tree, starting from 'top'
    """
    #print "action", action
    # Goal of action is to fill this dictionary
    dataDict={}
    for root, dirs, files in os.walk(top, topdown=False):
      if not "examples" in root: continue
      if not os.path.isfile(os.path.join(root,"makefile")): continue
      if self.verbose: print(root)
      bname=os.path.basename(root.rstrip("/"))
      self.genPetscTests(root,dirs,files,dataDict)
    # Now summarize this dictionary
    self.genPetscTests_summarize(dataDict)
    return dataDict

  def gen_gnumake(self, fd):
    """
     Overwrite of the method in the base PETSc class 
    """
    def write(stem, srcs):
      for lang in LANGS:
        if srcs[lang]['srcs']:
          fd.write('%(stem)s.%(lang)s := %(srcs)s\n' % dict(stem=stem, lang=lang, srcs=' '.join(srcs[lang]['srcs'])))
    for pkg in PKGS:
        srcs = self.gen_pkg(pkg)
        write('testsrcs-' + pkg, srcs)
        # Handle dependencies
        for lang in LANGS:
            for exfile in srcs[lang]['srcs']:
                if exfile in srcs[lang]:
                    ex='$(TESTDIR)/'+os.path.splitext(exfile)[0]
                    exfo='$(TESTDIR)/'+os.path.splitext(exfile)[0]+'.o'
                    fd.write(exfile+": $(TESTDIR)/"+ srcs[lang][exfile]+'\n')
                    fd.write(ex    +": "+exfo+" $(TESTDIR)/"+srcs[lang][exfile] +'\n')

    return self.gendeps

  def gen_pkg(self, pkg):
    """
     Overwrite of the method in the base PETSc class 
    """
    return self.sources[pkg]

  def write_gnumake(self,dataDict):
    """
     Write out something similar to files from gmakegen.py

     Test depends on script which also depends on source
     file, but since I don't have a good way generating
     acting on a single file (oops) just depend on
     executable which in turn will depend on src file
    """
    # Different options for how to set up the targets
    compileExecsFirst=False

    # Open file
    arch_files = os.path.join(self.arch_dir,'lib','petsc','conf', 'testfiles')
    fd = open(arch_files, 'w')

    # Write out the sources
    gendeps = self.gen_gnumake(fd)

    # Write out the tests and execname targets
    fd.write("\n#Tests and executables\n")    # Delimiter

    for pkg in PKGS:
      # These grab the ones that are built
      for lang in LANGS:
        testdeps=[]
        for ftest in self.tests[pkg][lang]:
          test=os.path.basename(ftest)
          basedir=os.path.dirname(ftest)
          testdeps.append(self.nameSpace(test,basedir))
        fd.write("test-"+pkg+"."+lang+" := "+' '.join(testdeps)+"\n")
        fd.write('test-%s.%s : $(test-%s.%s)\n' % (pkg, lang, pkg, lang))

        # test targets
        for ftest in self.tests[pkg][lang]:
          test=os.path.basename(ftest)
          basedir=os.path.dirname(ftest)
          testdir="${TESTDIR}/"+basedir+"/"
          nmtest=self.nameSpace(test,basedir)
          rundir=os.path.join(testdir,test)
          #print test, nmtest
          script=test+".sh"

          # Deps
          exfile=self.tests[pkg][lang][ftest]['exfile']
          fullex=os.path.join(os.path.dirname(self.srcdir),exfile)
          localexec=self.tests[pkg][lang][ftest]['exec']
          execname=os.path.join(testdir,localexec)
          fullscript=os.path.join(testdir,script)
          tmpfile=os.path.join(testdir,test,test+".tmp")

          # *.counts depends on the script and either executable (will
          # be run) or the example source file (SKIP or TODO)
          if exfile in self.sources[pkg][lang]:
              fd.write('%s.counts : %s %s %s\n'
                  % (os.path.join('$(TESTDIR)/counts', nmtest),
                     fullscript,
                     execname if exfile in self.sources[pkg][lang]['srcs'] else fullex,
                     os.path.join('$(TESTDIR)',self.sources[pkg][lang][exfile]))
                  )
          else:
              fd.write('%s.counts : %s %s\n'
                  % (os.path.join('$(TESTDIR)/counts', nmtest),
                     fullscript,
                     execname if exfile in self.sources[pkg][lang]['srcs'] else fullex)
                  )

          # Now write the args:
          fd.write(nmtest+"_ARGS := '"+self.tests[pkg][lang][ftest]['argLabel']+"'\n")

    fd.close()
    return

  def writeHarness(self,output,dataDict):
    """
     This is set up to write out multiple harness even if only gnumake
     is supported now
    """
    eval("self.write_"+output+"(dataDict)")
    return

def main(petsc_dir=None, petsc_arch=None, output=None, verbose=False, single_ex=False, srcdir=None, testdir=None):
    if output is None:
        output = 'gnumake'

    # Allow petsc_arch to have both petsc_dir and petsc_arch for convenience
    if petsc_arch: 
        if len(petsc_arch.split(os.path.sep))>1:
            petsc_dir,petsc_arch=os.path.split(petsc_arch.rstrip(os.path.sep))

    pEx=generateExamples(petsc_dir=petsc_dir, petsc_arch=petsc_arch,
                         verbose=verbose, single_ex=single_ex, srcdir=srcdir,
                         testdir=testdir)
    dataDict=pEx.walktree(os.path.join(pEx.srcdir))
    pEx.writeHarness(output,dataDict)

if __name__ == '__main__':
    import optparse
    parser = optparse.OptionParser()
    parser.add_option('--verbose', help='Show mismatches between makefiles and the filesystem', action='store_true', default=False)
    parser.add_option('--petsc-arch', help='Set PETSC_ARCH different from environment', default=os.environ.get('PETSC_ARCH'))
    parser.add_option('--srcdir', help='Set location of sources different from PETSC_DIR/src', default=None)
    parser.add_option('--output', help='Location to write output file', default=None)
    parser.add_option('-s', '--single_executable', dest='single_executable', action="store_false", help='Whether there should be single executable per src subdir.  Default is false')
    parser.add_option('-t', '--testdir', dest='testdir',  help='Test directory: PETSC_DIR/PETSC_ARCH/testdir.  Default is "tests"')
    opts, extra_args = parser.parse_args()
    opts, extra_args = parser.parse_args()
    if extra_args:
        import sys
        sys.stderr.write('Unknown arguments: %s\n' % ' '.join(extra_args))
        exit(1)
    main(petsc_arch=opts.petsc_arch, output=opts.output, verbose=opts.verbose,
         single_ex=opts.single_executable, srcdir=opts.srcdir, testdir=opts.testdir)