###-*- R -*- Unix Specific ----

.Library <- file.path(R.home(), "library")
.Library.site <- Sys.getenv("R_LIBS_SITE") # This is set in Renviron.
.Library.site <-
    if(.Library.site == "NULL") character() else unlist(strsplit(.Library.site, ":"))
.Library.site <- .Library.site[dir.exists(.Library.site)]

local({
    libs <- Sys.getenv("R_LIBS_USER") # This is set in Renviron.
    libs <- if(libs == "NULL") character() else unlist(strsplit(libs, ":"))
    ## .libPaths filters on existence.
    invisible(.libPaths(c(unlist(strsplit(Sys.getenv("R_LIBS"), ":")),
                          libs)))
})
local({
    popath <- Sys.getenv("R_TRANSLATIONS", "")
    if(!nzchar(popath)) {
        paths <- file.path(.libPaths(), "translations", "DESCRIPTION")
        popath <- dirname(paths[file.exists(paths)][1])
    }
    bindtextdomain("R", popath)
    bindtextdomain("R-base", popath)
    assign(".popath", popath, .BaseNamespaceEnv)
})
local({
## we distinguish between R_PAPERSIZE as set by the user and by configure
papersize <- Sys.getenv("R_PAPERSIZE_USER")
if(!nchar(papersize)) {
    lcpaper <- Sys.getlocale("LC_PAPER") # might be null: OK as nchar is 0
    papersize <- if(nchar(lcpaper))
        if(length(grep("(_US|_CA)", lcpaper))) "letter" else "a4"
    else Sys.getenv("R_PAPERSIZE")
}
options(papersize = papersize,
        printcmd = Sys.getenv("R_PRINTCMD"),
        dvipscmd = Sys.getenv("DVIPS", "dvips"),
        texi2dvi = Sys.getenv("R_TEXI2DVICMD"),
        browser = Sys.getenv("R_BROWSER"),
        pager = file.path(R.home(), "bin", "pager"),
        pdfviewer = Sys.getenv("R_PDFVIEWER"),
        useFancyQuotes = TRUE)
})

## non standard settings for the R.app GUI of the macOS port
if(.Platform$GUI == "AQUA") {
    ## this is set to let RAqua use both X11 device and X11/TclTk
    if (Sys.getenv("DISPLAY") == "")
	Sys.setenv("DISPLAY" = ":0")

    ## this is to allow gfortran compiler to work
    Sys.setenv("PATH" = paste(Sys.getenv("PATH"),":/usr/local/bin",sep = ""))
}## end "Aqua"

## de-dupe the environment on macOS (bug in Yosemite which affects things like PATH)
if (grepl("^darwin", R.version$os)) local({
    ## we have to de-dupe one at a time and re-check since the bug affects how
    ## environment modifications propagate
    while(length(dupes <- names(Sys.getenv())[table(names(Sys.getenv())) > 1])) {
        env <- dupes[1]
        value <- Sys.getenv(env)
        Sys.unsetenv(env)             ## removes the dupes, good
        .Internal(Sys.setenv(env, value)) ## wrapper requries named vector, a pain, hence internal
    }
})

local({
    tests_startup <- Sys.getenv("R_TESTS")
    if(nzchar(tests_startup)) source(tests_startup)
})
