code shortening.
code shortening.

pdp10/sbpipe,pdp10/sbpipe,pdp10/sbpipe
# Copyright (c) 2018 Piero Dalle Pezze
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
#
# Object: A script to check whether an R package is installed. Callable from other programming languages using Rscript.


# Return TRUE if the package is installed, FALSE otherwise
#
# :param x: the package name to check
# :return: TRUE if the x is installed.
is_package_installed <- function(x) {
    # no need to be noisy here.
    suppressMessages(suppressWarnings(require(x, character.only=TRUE)))
}

main <- function(args) {
    package <- args[1]
    print(is_package_installed(package))
}


main(commandArgs(TRUE))
# Clean the environment
rm ( list=ls ( ) )

# Copyright (c) 2018 Piero Dalle Pezze
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
#
# Object: A script to check whether an R package is installed. Callable from other programming languages using Rscript.


# Return TRUE if the package is installed, FALSE otherwise
#
# :param x: the package name to check
# :return: TRUE if the x is installed.
is_package_installed <- function(x) {
    # no need to be noisy here.
    if (!suppressMessages(suppressWarnings(require(x, character.only=TRUE)))) {
        FALSE
    } else {
        TRUE
    }
}

main <- function(args) {
    package <- args[1]
    print(is_package_installed(package))
}


main(commandArgs(TRUE))
# Clean the environment
rm ( list=ls ( ) )
