Msplit.py

#!/usr/bin/env python
'''Splits file into slices along the last dimension
Usage:

sfsplit inp=file.rsf outdir=[file_split.rsf] nthick=[1]

Parameter nthick gives the maximum thickness of a slice. The last slice may
be thinner.'''

# Copyright (C) 2009 Ioan Vlad
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

import os, sys, math

try: # Give precedence to local version
    import ivlad, m8rex
except: # Use distributed version
    import rsf.user.ivlad as ivlad
    import rsf.user.m8rex as m8rex

################################################################################

def main(par):

    verb = par.bool('verb', False)

    inp = par.string('inp') # ifile.rsf

    out_basenm = os.path.basename(inp).rstrip(ivlad.ext) + '_split'

    outdir = par.string('outdir',(out_basenm+ivlad.ext)) # Default is ifile_split.rsf

    nthick = par.int('nthick', 1) # slice thickness

    ivlad.chk_param_limit(nthick, 'nthick', 1, '>')

    lastdim = str(ivlad.ndims(inp))

    n = int(ivlad.getout('sfget',['parform=n','n'+lastdim], inp))
    ivlad.chk_param_limit(nthick, 'nthick', n, '<')

    if not os.path.isdir(outdir):
        os.mkdir(outdir)

    # Slices will be called 01.rsf, etc. Avoid datapath aliasing:
    dpath = 'datapath=$DATAPATH/' + out_basenm + '_'

    nslices_whole = int(math.floor(n/nthick))

    f = 0

    for i in range(nslices_whole):

        i_str = ivlad.add_zeros(i,nslices_whole)
        i_slc = os.path.join(outdir, i_str + '_stdout' + ivlad.ext)

        cmd = '<%s sfwindow f%s=%d ' % (inp, lastdim,f)
        cmd += 'n%s=%d %s > %s' % (lastdim, nthick, dpath, i_slc)
        ivlad.exe(cmd, verb)

        f += nthick

    ist = n - nslices_whole * nthick # Incomplete Slice Thickness

    if ist > 0:
        i_str = ivlad.add_zeros(i+1,nslices_whole)
        i_slc = os.path.join(outdir, i_str + '_stdout' + ivlad.ext)

        cmd = '<%s sfwindow f%s=%d ' % (inp, lastdim, f)
        cmd += 'n%s=%d > %s' % (lastdim, ist, i_slc)
        ivlad.exe(cmd, verb)

    return ivlad.unix_success

##############################################

if __name__ == '__main__':
    ivlad.run(main, ['inp'])