use argparse in colvars lib build

from __future__ import print_function

import sys,os,subprocess

sys.path.append('..')

from install_helpers import error,get_cpus

from install_helpers import get_cpus

from argparse import ArgumentParser

parser = ArgumentParser(prog='Install.py',

                        description="LAMMPS library build wrapper script")

# help message

make lib-colvars args="-m mpi"     # build COLVARS lib with default mpi compiler wrapper

"""

# parse args

# set lib from working dir

args = sys.argv[1:]

nargs = len(args)

if nargs == 0: error(help=help)

cwd = os.getcwd()

lib = os.path.basename(cwd)

machine = None

extraflag = False

# parse and process arguments

iarg = 0

while iarg < nargs:

  if args[iarg] == "-m":

    if iarg+2 > len(args): error(help=help)

    machine = args[iarg+1]

    iarg += 2

  elif args[iarg] == "-e":

    if iarg+2 > len(args): error(help=help)

    extraflag = True

    suffix = args[iarg+1]

    iarg += 2

  else: error(help=help)

parser.add_argument("-m", "--machine",

                    help="suffix of a <libname>/Makefile.* or of a src/MAKE/MACHINES/Makefile.* file used for compiling this library")

parser.add_argument("-e", "--extramake",

                    help="set EXTRAMAKE variable in <libname>/Makefile.<machine> to Makefile.lammps.<extramake>")

# set lib from working dir

args = parser.parse_args()

cwd = os.getcwd()

lib = os.path.basename(cwd)

# print help message and exit, if neither build nor path options are given

if not args.machine and not args.extramake:

  parser.print_help()

  sys.exit(help)

machine = args.machine

extraflag = args.extramake != None

suffix = args.extramake

def get_lammps_machine_flags(machine):

  """Parse Makefile.machine from LAMMPS, return dictionary of compiler flags"""

  if not os.path.exists("../../src/MAKE/MACHINES/Makefile.%s" % machine):

    error("Cannot locate src/MAKE/MACHINES/Makefile.%s" % machine)

    sys.exit("Cannot locate src/MAKE/MACHINES/Makefile.%s" % machine)

  lines = open("../../src/MAKE/MACHINES/Makefile.%s" % machine,

               'r').readlines()

  machine_flags = {}

  machine_flags = get_lammps_machine_flags(machine)

  gen_colvars_makefile_machine(machine, machine_flags)

if not os.path.exists("Makefile.%s" % machine):

  error("lib/%s/Makefile.%s does not exist" % (lib,machine))

  sys.exit("lib/%s/Makefile.%s does not exist" % (lib,machine))

# create Makefile.auto as copy of Makefile.machine

# reset EXTRAMAKE if requested

  sys.exit(1)

if os.path.exists("lib%s.a" % lib): print("Build was successful")

else: error("Build of lib/%s/lib%s.a was NOT successful" % (lib,lib))

else: sys.exit("Build of lib/%s/lib%s.a was NOT successful" % (lib,lib))

if not os.path.exists("Makefile.lammps"):

  print("lib/%s/Makefile.lammps was NOT created" % lib)