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#' Load a specific version of groundhog, as available on a given date
#'
#'@param date character string (yyyy-mm-dd), or date value, with the date which determines the
#'version of groundhog to load
#'@examples
#' \dontrun{
#' #Load groundhog as available on 2021-03-12 (v1.3.2)
#' meta.groundhog("2021-03-12")
#' }
#'
#' @export
meta.groundhog <- function (date)
{
#0 The package is groundhog
pkg='groundhog'
#1) Is date valid?
validate.date(date) #Function defined in utils.R
#2) Make a snowball, which is really just groundhog
snowball <- get.snowball(pkg, date)
#3) Unload the pkg
unloadNamespace('groundhog')
#4) Install it (always from source)
if (snowball[1,]$installed==FALSE) {
ap_source <- get.current.packages("source")
repos <- as.character(getOption("repos"))
snowball$source_url <- ifelse(snowball$pkg_vrs %in% ap_source$pkg_vrs,
paste0(repos , "/src/contrib/" ,snowball$pkg_vrs , ".tar.gz"),
paste0(repos , "/src/contrib/Archive/" ,snowball$pkg , "/" , snowball$pkg_vrs , ".tar.gz"))
dir.create(snowball$installation.path,recursive = TRUE,showWarnings = TRUE)
utils::install.packages(snowball$source_url,repos=NULL, type='source', lib=snowball$installation.path)
}
#5) attach the requested version
suppressPackageStartupMessages ( loadNamespace('groundhog', lib.loc = snowball$installation.path[1]))
suppressPackageStartupMessages ( attachNamespace('groundhog'))
#6) message
vrs <- get.version('groundhog',date)
message2("Now using 'groundhog_" , vrs , "'.")
#7) Warning if version is prior ot 1.4 that meta is no longer available
if (compareVersion(vrs,"1.4.0") <0) {
message1("This version of groundhog does not have the 'meta.groundhog()' function.")
message1("To switch to a different version of groundhog, you will have to restart ")
message1("the R session reload groundhog' \n ",restart.text())
}
}
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