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#1 Preliminaries
#2 If operating system is unknown (mostly, unix) don't look for binaries
#3 Read the gran toc
#4 Keep the wanted version
#5 Find date gaps (download vs wanted) and minimize
#6 return date
get.gran.binary.date <- function(pkg_vrs , date) {
#1 Preliminaries
os <- get.os()
date <- as.Date(date)
#2 If operating system is unknown (mostly, unix) don't look for binaries
if (os=='uknown') {
return(as.Date('1970-01-01'))
}
#3 Read the gran toc
gran.toc <- .pkgenv[["gran.toc"]]
#4 Keep the wanted version
#Extension
if (os=='windows') ext='zip'
if (os!="windows") ext='tgz'
#file.wanted
file.wanted = paste0(pkg_vrs,".",ext)
#Subset
gran.toc.sub = gran.toc[gran.toc$file == file.wanted,]
#If no date, early return
if (nrow(gran.toc.sub)==0) return(as.Date('1970-01-01'))
#5 Find date gaps (download vs wanted) and minimize
# diff <- gran.toc.sub$download.date - date
diff <- abs(difftime(gran.toc.sub$download.date,date))
#Minimizing one
k <- which.min(diff)
#6 Return it
return(gran.toc.sub$download.date[k])
}
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