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#!/usr/bin/env Rscript
# Copyright 2012-2013 Trevor L Davis <trevor.l.davis@gmail.com>
# Copyright 2008 Allen Day
#
# This file is free software: you may copy, redistribute 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 file 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, see <http://www.gnu.org/licenses/>.
suppressPackageStartupMessages(library("argparse"))
# create parser object
parser <- ArgumentParser()
# specify our desired options
# by default ArgumentParser will add an help option
parser$add_argument(
"-v",
"--verbose",
action = "store_true",
default = TRUE,
help = "Print extra output [default]"
)
parser$add_argument(
"-q",
"--quietly",
action = "store_false",
dest = "verbose",
help = "Print little output"
)
parser$add_argument(
"-c",
"--count",
type = "integer",
default = 5,
help = "Number of random normals to generate [default %(default)s]",
metavar = "number"
)
parser$add_argument(
"--generator",
default = "rnorm",
help = "Function to generate random deviates [default \"%(default)s\"]"
)
parser$add_argument(
"--mean",
default = 0,
type = "double",
help = "Mean if generator == \"rnorm\" [default %(default)s]"
)
parser$add_argument(
"--sd",
default = 1,
type = "double",
metavar = "standard deviation",
help = "Standard deviation if generator == \"rnorm\" [default %(default)s]"
)
# get command line options, if help option encountered print help and exit,
# otherwise if options not found on command line then set defaults,
args <- parser$parse_args()
# print some progress messages to stderr if "quietly" wasn't requested
if (args$verbose) {
write("writing some verbose output to standard error...\n", stderr())
}
# do some operations based on user input
if (args$generator == "rnorm") {
cat(paste(rnorm(args$count, mean = args$mean, sd = args$sd), collapse = "\n"))
} else {
cat(paste(do.call(args$generator, list(args$count)), collapse = "\n"))
}
cat("\n")
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