#!/usr/bin/env python3

#%module
#% description: Adds the values of two rasters (A + B)
#% keyword: raster
#% keyword: algebra
#% keyword: sum
#%end
#%option G_OPT_R_INPUT
#% key: araster
#% description: Name of input raster A in an expression A + B
#%end
#%option G_OPT_R_INPUT
#% key: braster
#% description: Name of input raster B in an expression A + B
#%end
#%option G_OPT_R_OUTPUT
#%end


import grass.script as gs


def main():
    options, flags = gs.parser()
    araster = options['araster']
    braster = options['braster']
    output = options['output']

    gs.mapcalc('{r} = {a} + {b}'.format(r=output, a=araster, b=braster))

    return 0


if __name__ == "__main__":
    main()