Command Line Interface and Options

This chapter describes how Options classes that are derived from OEOptions can be configured with command line inputs passed in through argv.

The OEConfigureOpts function is a convenience function that takes an OEOptions derivative options class and the command line arguments argv, parses the command line arguments, and configures the option parameters with command line inputs. A OEInterface is generated internally from the OEOptions, which performs the command lines parsing.

Note that this only applies to Options classes that are derived from the OEOptions. There are a handful of Options classes that still does not derive from OEOptions, and hence cannot be configured with command line inputs directly. Command Line Interface Definitions is an alternative way to work with command line interfaces for such cases.

In addition to the convenience function OEConfigureOpts, two additional general purpose Options classes, OESimpleAppOptions, and OERefInputAppOptions, are provided that extends any other options classes to include necessary input/output parameters that are generally required to create an application.

See also

• OEConfigureOpts function

• OEOptions class

• OESimpleAppOptions class

• OERefInputAppOptions class

Application with Input, output, and Options

The following example shows how to use the OESimpleAppOptions class to extend an Options class with an additional input and output file.

The specific example is taken from OEDocking, and uses the the OEMakeReceptor function to make a receptor in a design unit. In this example, the OEMakeReceptorOptions is extended with an input and output.

Listing 1: Application with input, output, and options (Making Receptor)

#!/usr/bin/env python
# (C) 2022 Cadence Design Systems, Inc. (Cadence) 
# All rights reserved.
# TERMS FOR USE OF SAMPLE CODE The software below ("Sample Code") is
# provided to current licensees or subscribers of Cadence products or
# SaaS offerings (each a "Customer").
# Customer is hereby permitted to use, copy, and modify the Sample Code,
# subject to these terms. Cadence claims no rights to Customer's
# modifications. Modification of Sample Code is at Customer's sole and
# exclusive risk. Sample Code may require Customer to have a then
# current license or subscription to the applicable Cadence offering.
# THE SAMPLE CODE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED.  OPENEYE DISCLAIMS ALL WARRANTIES, INCLUDING, BUT
# NOT LIMITED TO, WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. In no event shall Cadence be
# liable for any damages or liability in connection with the Sample Code
# or its use.

import sys

from openeye import oechem
from openeye import oedocking


def main(argv=[__name__]):
    recOpts = oedocking.OEMakeReceptorOptions()
    opts = oechem.OESimpleAppOptions(recOpts, "MakeReceptor", oechem.OEFileStringType_DU, oechem.OEFileStringType_DU)
    if oechem.OEConfigureOpts(opts, argv, False) == oechem.OEOptsConfigureStatus_Help:
        return 0
    recOpts.UpdateValues(opts)

    ifs = oechem.oeifstream()
    if not ifs.open(opts.GetInFile()):
        oechem.OEThrow.Fatal("Unable to open %s for reading" % opts.GetInFile())

    ofs = oechem.oeofstream()
    if not ofs.open(opts.GetOutFile()):
        oechem.OEThrow.Fatal("Unable to open %s for writing" % opts.GetOutFile())

    du = oechem.OEDesignUnit()
    while oechem.OEReadDesignUnit(ifs, du):
        if oedocking.OEMakeReceptor(du, recOpts):
            oechem.OEWriteDesignUnit(ofs, du)
        else:
            oechem.OEThrow.Warning("%s: %s" % (du.GetTitle(), "Failed to make receptor"))
    return 0


if __name__ == "__main__":
    sys.exit(main(sys.argv))

Download code

MakeReceptor.py

Application with Reference system, Input, output, and Options

Besides an input and output, some applications require an additional reference system input. The OERefInputAppOptions class can be used to extend an options class with three additional parameters, an input, output, and a reference system.

The following code example is taken from OEDocking, and uses the OEDock object to perform docking. In this example, the OEDockOptions is extended with an input, output, and a receptor (i.e., the reference system).

Listing 2: Application with input, reference, output, and options (Docking Molecules)

#!/usr/bin/env python
# (C) 2022 Cadence Design Systems, Inc. (Cadence) 
# All rights reserved.
# TERMS FOR USE OF SAMPLE CODE The software below ("Sample Code") is
# provided to current licensees or subscribers of Cadence products or
# SaaS offerings (each a "Customer").
# Customer is hereby permitted to use, copy, and modify the Sample Code,
# subject to these terms. Cadence claims no rights to Customer's
# modifications. Modification of Sample Code is at Customer's sole and
# exclusive risk. Sample Code may require Customer to have a then
# current license or subscription to the applicable Cadence offering.
# THE SAMPLE CODE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED.  OPENEYE DISCLAIMS ALL WARRANTIES, INCLUDING, BUT
# NOT LIMITED TO, WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. In no event shall Cadence be
# liable for any damages or liability in connection with the Sample Code
# or its use.

import sys

from openeye import oechem
from openeye import oedocking


def main(argv=[__name__]):
    dockOpts = oedocking.OEDockOptions()
    opts = oechem.OERefInputAppOptions(dockOpts, "DockMolecules", oechem.OEFileStringType_Mol3D,
                                       oechem.OEFileStringType_Mol3D, oechem.OEFileStringType_DU, "-receptor")
    if oechem.OEConfigureOpts(opts, argv, False) == oechem.OEOptsConfigureStatus_Help:
        return 0
    dockOpts.UpdateValues(opts)

    ifs = oechem.oemolistream()
    if not ifs.open(opts.GetInFile()):
        oechem.OEThrow.Fatal("Unable to open %s for reading" % opts.GetInFile())

    rfs = oechem.oeifstream()
    if not rfs.open(opts.GetRefFile()):
        oechem.OEThrow.Fatal("Unable to open %s for reading" % opts.GetRefFile())

    ofs = oechem.oemolostream()
    if not ofs.open(opts.GetOutFile()):
        oechem.OEThrow.Fatal("Unable to open %s for writing" % opts.GetOutFile())

    du = oechem.OEDesignUnit()
    if not oechem.OEReadDesignUnit(rfs, du):
        oechem.OEThrow.Fatal("Failed to read design unit")
    if not du.HasReceptor():
        oechem.OEThrow.Fatal("Design unit %s does not contain a receptor" % du.GetTitle())

    dock = oedocking.OEDock(dockOpts)
    dock.Initialize(du)

    for mcmol in ifs.GetOEMols():
        print("docking", mcmol.GetTitle())
        dockedMol = oechem.OEGraphMol()
        retCode = dock.DockMultiConformerMolecule(dockedMol, mcmol)
        if (retCode != oedocking.OEDockingReturnCode_Success):
            oechem.OEThrow.Fatal("Docking Failed with error code " + oedocking.OEDockingReturnCodeGetName(retCode))

        sdtag = oedocking.OEDockMethodGetName(dockOpts.GetScoreMethod())
        oedocking.OESetSDScore(dockedMol, dock, sdtag)
        dock.AnnotatePose(dockedMol)
        oechem.OEWriteMolecule(ofs, dockedMol)

    return 0


if __name__ == "__main__":
    sys.exit(main(sys.argv))

Download code

DockMolecules.py

Application with Input and output only

Some applications do not have any additional options or parameters, and only require an input and output. The OESimpleAppOptions class has an overload that does not require an OEOptions input argument.

The following code example is taken from OEQuacpac, and uses the OEAssignCharges method to assign charges in an OEDesignUnit. This example only configures an input and output, and does not have any additional parameters to configure.

Listing 3: Application with input and output only (DesignUnit Charges)

#!/usr/bin/env python
# (C) 2022 Cadence Design Systems, Inc. (Cadence) 
# All rights reserved.
# TERMS FOR USE OF SAMPLE CODE The software below ("Sample Code") is
# provided to current licensees or subscribers of Cadence products or
# SaaS offerings (each a "Customer").
# Customer is hereby permitted to use, copy, and modify the Sample Code,
# subject to these terms. Cadence claims no rights to Customer's
# modifications. Modification of Sample Code is at Customer's sole and
# exclusive risk. Sample Code may require Customer to have a then
# current license or subscription to the applicable Cadence offering.
# THE SAMPLE CODE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED.  OPENEYE DISCLAIMS ALL WARRANTIES, INCLUDING, BUT
# NOT LIMITED TO, WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. In no event shall Cadence be
# liable for any damages or liability in connection with the Sample Code
# or its use.

#############################################################################
# This program demonstrates how to apply charges to an OEDesignUnit.
#############################################################################

import sys
from openeye import oechem
from openeye import oequacpac


def main(argv=[__name__]):
    opts = oechem.OESimpleAppOptions("applycharges_du", oechem.OEFileStringType_DU,
                                     oechem.OEFileStringType_DU)
    if oechem.OEConfigureOpts(opts, argv, False) == oechem.OEOptsConfigureStatus_Help:
        return 0

    ifs = oechem.oeifstream()
    if not ifs.open(opts.GetInFile()):
        oechem.OEThrow.Fatal("Unable to open %s for reading" % opts.GetInFile())

    ofs = oechem.oeofstream()
    if not ofs.open(opts.GetOutFile()):
        oechem.OEThrow.Fatal("Unable to open %s for writing" % opts.GetOutFile())

    du = oechem.OEDesignUnit()
    while oechem.OEReadDesignUnit(ifs, du):
        charge_engine = oequacpac.OEDesignUnitCharges()
        if charge_engine.ApplyCharges(du):
            oechem.OEWriteDesignUnit(ofs, du)
        else:
            oechem.OEThrow.Warning("%s: %s" % (du.GetTitle(), "Failed to assign charges"))
    return 0


if __name__ == "__main__":
    sys.exit(main(sys.argv))

Download code

applycharges_oedu.py

Adding custom parameters

Custom parameters can also be added to an application API when a built-in Options class does not contain all required parameters for the application.

The following code example is taken from OEDocking, and uses the OEPosit object to generate pose structures. In this example, the OEPositOptions is extended with an input, output, and receptor (i.e., the reference system). However, the number of poses to generate is not a built-in parameter into the OEPositOptions. This example shows how to add an additional parameter, for the number of poses, to be configured through the command line.

Listing 4: Adding custom parameters (POSIT with Multiple Receptors)

#!/usr/bin/env python
# (C) 2022 Cadence Design Systems, Inc. (Cadence) 
# All rights reserved.
# TERMS FOR USE OF SAMPLE CODE The software below ("Sample Code") is
# provided to current licensees or subscribers of Cadence products or
# SaaS offerings (each a "Customer").
# Customer is hereby permitted to use, copy, and modify the Sample Code,
# subject to these terms. Cadence claims no rights to Customer's
# modifications. Modification of Sample Code is at Customer's sole and
# exclusive risk. Sample Code may require Customer to have a then
# current license or subscription to the applicable Cadence offering.
# THE SAMPLE CODE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED.  OPENEYE DISCLAIMS ALL WARRANTIES, INCLUDING, BUT
# NOT LIMITED TO, WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. In no event shall Cadence be
# liable for any damages or liability in connection with the Sample Code
# or its use.

import sys
from openeye import oechem
from openeye import oedocking


class MyOptions(oedocking.OEPositOptions):
    def __init__(self):
        oedocking.OEPositOptions.__init__(self)
        param1 = oechem.OEUIntParameter("-numPoses", 1)
        param1.AddLegalRange("1", "20")
        param1.SetBrief("Number of poses to generate")
        self._param1 = self.AddParameter(param1)
        pass

    def GetNumPoses(self):
        if self._param1.GetHasValue():
            return int(self._param1.GetStringValue())
        return int(self._param1.GetStringDefault())

def main(argv=[__name__]):
    positOpts = MyOptions()
    opts = oechem.OERefInputAppOptions(positOpts, "PoseMolecules", oechem.OEFileStringType_Mol3D,
                                       oechem.OEFileStringType_DU, oechem.OEFileStringType_DU, "-receptor")
    if oechem.OEConfigureOpts(opts, argv, False) == oechem.OEOptsConfigureStatus_Help:
        return 0
    positOpts.UpdateValues(opts)

    ifs = oechem.oemolistream()
    if not ifs.open(opts.GetInFile()):
        oechem.OEThrow.Fatal("Unable to open %s for reading" % opts.GetInFile())

    rfs = oechem.oeifstream()
    if not rfs.open(opts.GetRefFile()):
        oechem.OEThrow.Fatal("Unable to open %s for reading" % opts.GetRefFile())

    ofs = oechem.oeofstream()
    if not ofs.open(opts.GetOutFile()):
        oechem.OEThrow.Fatal("Unable to open %s for writing" % opts.GetOutFile())

    poser = oedocking.OEPosit(positOpts)
    du = oechem.OEDesignUnit()
    count = 0
    while oechem.OEReadDesignUnit(rfs, du):
        if not du.HasReceptor():
            oechem.OEThrow.Fatal("Design unit %s does not contain a receptor" % du.GetTitle())
        poser.AddReceptor(du)
        count += 1
    if count == 0:
        oechem.OEThrow.Fatal("Receptor input does not contain any design unit")

    oechem.OEThrow.Info("Number of conformers: %d" % positOpts.GetNumPoses())
    oechem.OEThrow.Info("Best Receptor pose flag: %s" % positOpts.GetBestReceptorPoseOnly())
    
    for mcmol in ifs.GetOEMols():
        oechem.OEThrow.Info("posing %s" % mcmol.GetTitle())
        results = oedocking.OEPositResults()
        ret_code = poser.Dock(results, mcmol, positOpts.GetNumPoses())

        if ret_code == oedocking.OEDockingReturnCode_Success:
            for result in results.GetSinglePoseResults():
                posedDU = result.GetDesignUnit()
                posedDU.SetDoubleData(poser.GetName(), result.GetProbability())
                oechem.OEThrow.Info("Receptor used: %s pose probability: %f" % (posedDU.GetTitle(), result.GetProbability()))
                oechem.OEWriteDesignUnit(ofs, posedDU)
        else:
            errMsg = oedocking.OEDockingReturnCodeGetName(ret_code)
            oechem.OEThrow.Warning("%s: %s" % (mcmol.GetTitle(), errMsg))
    return 0

    

if __name__ == "__main__":
    sys.exit(main(sys.argv))

Download code

GenerateMultiplePose.py

Defining new options class

Options classes, derived from OEOptions, can also be defined at the script level, and wrapped with the OESimpleAppOptions or OERefInputAppOptions, to build applications.

The following code example is taken from OEFF, and optimizes molecule conformations using a force field. In this example, a new Options class is defined to accept command line input for the force field.

Listing 5: Defining Options class (Optimize molecule)

#!/usr/bin/env python
# (C) 2022 Cadence Design Systems, Inc. (Cadence) 
# All rights reserved.
# TERMS FOR USE OF SAMPLE CODE The software below ("Sample Code") is
# provided to current licensees or subscribers of Cadence products or
# SaaS offerings (each a "Customer").
# Customer is hereby permitted to use, copy, and modify the Sample Code,
# subject to these terms. Cadence claims no rights to Customer's
# modifications. Modification of Sample Code is at Customer's sole and
# exclusive risk. Sample Code may require Customer to have a then
# current license or subscription to the applicable Cadence offering.
# THE SAMPLE CODE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED.  OPENEYE DISCLAIMS ALL WARRANTIES, INCLUDING, BUT
# NOT LIMITED TO, WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. In no event shall Cadence be
# liable for any damages or liability in connection with the Sample Code
# or its use.

import sys
from openeye import oechem
from openeye import oeff

# //////////////////////////////////////////////////////////////////////////
# The following example demonstrates how to perform ligand optimization   //
# //////////////////////////////////////////////////////////////////////////


class FFOptions(oechem.OEOptions):
    def __init__(self):
        oechem.OEOptions.__init__(self, "FFOptions")

        ffType = oechem.OEStringParameter("-ff", "parsley")
        ffType.AddLegalValue("parsley")
        ffType.AddLegalValue("mmff94")
        ffType.AddLegalValue("mmff94s")
        ffType.SetBrief("Force field type")
        self._fftype = self.AddParameter(ffType)
        pass

    def CreateCopy(self):
        return self

    def GetFF(self):
        ff = self._fftype.GetStringValue()
        if ff == "":
            ff = self._fftype.GetStringDefault()

        if ff == "mmff94":
            return oeff.OEMMFF()
        elif ff == "mmff94s":
            return oeff.OEMMFF(oeff.OEMMFF94sParams())
        else:
            return oeff.OEParsley()


def main(argv=[__name__]):
    ffOpts = FFOptions()
    opts = oechem.OESimpleAppOptions(ffOpts, "FFOptimize", oechem.OEFileStringType_Mol3D,
                                     oechem.OEFileStringType_Mol3D)
    if oechem.OEConfigureOpts(opts, argv, False) == oechem.OEOptsConfigureStatus_Help:
        return 0
    ffOpts.UpdateValues(opts)

    ifs = oechem.oemolistream()
    if not ifs.open(opts.GetInFile()):
        oechem.OEThrow.Fatal("Unable to open %s for reading" % opts.GetInFile())

    ofs = oechem.oemolostream()
    if not ofs.open(opts.GetOutFile()):
        oechem.OEThrow.Fatal("Unable to open %s for writing" % opts.GetOutFile())

    ff = ffOpts.GetFF()
    for mol in ifs.GetOEMols():
        print("Optimizing", mol.GetTitle())
        if not ff.PrepMol(mol) or not ff.Setup(mol):
            oechem.OEThrow.Warning("Unable to process molecule: title = '%s'" % mol.GetTitle())
            oechem.OEWriteMolecule(ofs, mol)
            continue

        vecCoords = oechem.OEDoubleArray(3*mol.GetMaxAtomIdx())
        for conf in mol.GetConfs():
            oechem.OEThrow.Info("Molecule: %s Conformer: %d" % (mol.GetTitle(), conf.GetIdx()+1))
            conf.GetCoords(vecCoords)

            # Calculate energy
            energy = ff(vecCoords)
            oechem.OEThrow.Info("Initial energy: %0.2f kcal/mol" % energy)

            # Optimize the ligand
            optimizer = oeff.OEBFGSOpt()
            energy = optimizer(ff, vecCoords, vecCoords)
            oechem.OEThrow.Info("Optimized energy: %0.2f kcal/mol" % energy)
            conf.SetCoords(vecCoords)

        oechem.OEWriteMolecule(ofs, mol)

    return 0


if __name__ == "__main__":
    sys.exit(main(sys.argv))

Download code

FFOptimize.py