R/AAA.R

In mhahsler/rMSA: Interface for Popular Multiple Sequence Alignment Tools

#######################################################################
# BiostringsTools - Interfaces to several sequence alignment and
# classification tools
# Copyright (C) 2012 Michael Hahsler and Anurag Nagar
#
# 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
# 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.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.


.findExecutable <- function(exe, interactive = TRUE) {
    path <- Sys.which(exe)
    if (all(path == "")) {
        if (interactive) {
            stop("Executable for ", paste(exe, collapse = " or "),
                " not found! Install the needed software (see: https://github.com/mhahsler/rMSA/blob/master/INSTALL)!",
                call. = FALSE
            )
        }
        return(character(0))
    }

    path[which(path != "")[1]]
}