Nothing
swd <- function(x) UseMethod("swd")
swd.NULL <- function(x) {
if (!exists("WD_0", DIRS))
DIRS$WD_0 <- getwd()
message(getwd())
}
swd.character <- function(x) {
if (identical(wd.index <- DIRS$WD_INDEX, 0L) && !exists("WD_0", DIRS))
DIRS$WD_0 <- getwd()
for (dir.name in x)
setwd(dir.name)
message(new.wd <- getwd())
old.wd <- DIRS[[sprintf("WD_%i", wd.index)]]
if (!identical(old.wd, new.wd)) {
wd.index <- DIRS$WD_INDEX <- wd.index + 1L
DIRS[[sprintf("WD_%i", wd.index)]] <- new.wd
}
invisible(NULL)
}
swd.numeric <- function(x) {
if (L(x <- as.integer(x)) > 0L) {
y <- getwd()
for (i in seq.int(1L, x))
y <- dirname(y)
} else {
wd.index <- DIRS$WD_INDEX + x
y <- DIRS[[sprintf("WD_%i", wd.index)]]
}
swd.character(y)
}
listwd <- function(x) UseMethod("listwd")
listwd.NULL <- function(x) {
listwd.numeric(10)
}
listwd.numeric <- function(x) {
if (!exists("WD_0", DIRS))
DIRS$WD_0 <- getwd()
y <- -seq.int(pmin(L(x <- as.integer(x)) - 1L, DIRS$WD_INDEX), 0L)
x <- unlist(mget(sprintf("WD_%i", DIRS$WD_INDEX + y), DIRS))
message(paste(sprintf("% 3i", y), x, collapse = "\n"))
invisible(x)
}
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