.onAttach <- function(libname, pkgname) {
## check for presence of an ADMIXTOOLS command on user's PATH and display
## a warning if it's not present
cmds <- c("qp3Pop", "qpDstat", "qpF4ratio", "qpAdm", "qpWave", "qpfstats", "mergeit")
path_check <- all(Sys.which(cmds) != "")
if (!path_check) {
packageStartupMessage(
"ADMIXTOOLS programs required by admixr are not in your $PATH variable.\n",
"At the very least, the following programs should be available:\n ",
paste(cmds, collapse = ", "),
"\nOne way to solve this is to modify the $PATH variable in your ~/.Renviron\n",
"file so that it points to the directory containing the ADMIXTOOLS programs.\n\n",
"Current contents of the $PATH:\n", Sys.getenv("PATH", "\n")
)
}
}
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