Nothing
## .onLoad <- function(lib, pkg)
## {
## }
##' return 'x' unless it is NULL where you'd use 'orElse'
`%||%` <- function(x, orElse) if(!is.null(x)) x else orElse
## if(!exists("rep_len", mode = "function")) # old R version
## rep_len <- function(x, length.out) rep(x, length.out=length.out)
## For backwards compatibility with earlier versions of R,
## at least until x.y.z if we have Depends: R (>= x.y.z)
if((Rv <- getRversion()) < "4.1.0") {
if(## Namespace not locked yet, but being defensive here:
!environmentIsLocked(Mns <- parent.env(environment()))) {
assign("...names", envir = Mns, inherits = FALSE,
function() eval(quote(names(list(...))), sys.frame(-1L)))
}
if(Rv < "4.0.0") {
deparse1 <- function (expr, collapse = " ", width.cutoff = 500L, ...)
paste(deparse(expr, width.cutoff, ...), collapse = collapse)
if(Rv < "3.5") {
## if(!is.function(.BaseNamespaceEnv$...length)) # ...length() only in R >= 3.5.0
## This substitute is kludgy by using parent.env() -- but it works (sometimes)
## in funEnv() -- see ../R/misc-goodies.R
...length <- function() eval(quote(length(list(...))), envir = parent.frame())
isTRUE <- function(x) is.logical(x) && length(x) == 1L && !is.na(x) && x
isFALSE <- function(x) is.logical(x) && length(x) == 1L && !is.na(x) && !x
}
}## Rv < 4.0.0
}## Rv < 4.1.0
.set.eps_view <- function() {
## This assumes "gv" in your path --- ideally this would be configured!
if(!is.character(getOption("eps_view")) && .Platform $ OS.type == "unix") {
SYS <- function(cmd) system(cmd, intern=TRUE, ignore.stderr=TRUE)
## doesRespond <- function(cmd) length(SYS(cmd)) > 0
doesRespond <- function(cmd) ## should be portable (thanks BDR):
all(system(paste(cmd,"> /dev/null")) != c(1,256)*127)
if(doesRespond("gv -h")) { ## 'gv'
cmd <- "gv -watch -geometry -0+0 -magstep -2 -media BBox -noantialias"
hyphens <-
SYS(paste("gv -h | fgrep watch | head -1",
"| sed 's/watch.*//; s/^[\\s ]*//'"))
if(length(hyphens) && hyphens == "--")
cmd <- sub(" --geometry", " -geometry",
sub(" --magstep ", " --scale=",
sub(" --media ", " --media=",
gsub(" -([a-z])", " --\\1", cmd))))
}
else if (doesRespond("ggv --version")) { ## try 'ggv'
cmd <- "ggv --geometry -0+0"
} else if (doesRespond("evince --version")) { ## try 'evince'
cmd <- "evince" # no geometry options
} else if (doesRespond("kghostview --version")) { ## try 'kghostview'
cmd <- "kghostview --geometry -0+0"
} else {
warning("no valid postscript previewer found; consider setting\n",
" options(\"eps_view\"= \"....\") yourself")
cmd <- "replace_with_postscript_previewer"
}
options("eps_view" = cmd)
}
}
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