R/AAA.R

In rgrass: Interface Between 'GRASS' Geographical Information System and 'R'

.GRASS_CACHE <- new.env(FALSE, parent = globalenv())

if (!exists("Sys.setenv", envir = baseenv())) Sys.setenv <- Sys.putenv

.onLoad <- function(lib, pkg) {
  assign(".GRASS_old.GRASS_PAGER", Sys.getenv("GRASS_PAGER"), envir = .GRASS_CACHE)
  Sys.setenv("GRASS_PAGER" = "cat")
  assign(".GRASS_old.GRASS_MESSAGE_FORMAT", Sys.getenv("GRASS_MESSAGE_FORMAT"),
    envir = .GRASS_CACHE
  )
  assign("INIT_USED", FALSE, envir = .GRASS_CACHE)
  assign("remove_GISRC", FALSE, envir = .GRASS_CACHE)

  Sys.setenv("GRASS_MESSAGE_FORMAT" = "text")

  gisrc <- Sys.getenv("GISRC")
  loc <- Sys.getenv("LOCATION_NAME")

  assign("cmdCACHE", list(), envir = .GRASS_CACHE)
  assign("override_encoding", "", envir = .GRASS_CACHE)
  SYS <- ""
  if (.Platform$OS.type == "windows") {
    SYS <- "WinNat"
  } else if (.Platform$OS.type == "unix") {
    SYS <- "unix"
  } else {
    SYS <- "unknown"
  }
  assign("SYS", SYS, envir = .GRASS_CACHE)
  res <- ""
  if (SYS == "WinNat") res <- ".exe"
  assign("addEXE", res, envir = .GRASS_CACHE)
  assign("WN_bat", "", envir = .GRASS_CACHE)

  assign("ignore.stderr", FALSE, envir = .GRASS_CACHE)
  assign("stop_on_no_flags_paras", TRUE, envir = .GRASS_CACHE)
  assign("echoCmd", FALSE, envir = .GRASS_CACHE)
  assign("GV", "", envir = .GRASS_CACHE)
  assign("useIntern", FALSE, envir = .GRASS_CACHE)
  assign("legacyExec", .Platform$OS.type == "windows", envir = .GRASS_CACHE)
  assign("defaultFlags", NULL, envir = .GRASS_CACHE)
  assign("suppressEchoCmdInFunc", TRUE, envir = .GRASS_CACHE)
  assign("R_interface", NULL, envir = .GRASS_CACHE)
}

.onAttach <- function(lib, pkg) {
  gisrc <- Sys.getenv("GISRC")
  loc <- Sys.getenv("LOCATION_NAME")
  if (nchar(gisrc) == 0) {
    gv <- "(GRASS not running)"
  } else {
    gv <- .grassVersion()
    comp <- .compatibleGRASSVersion(gv)
    if (!is.na(comp) && !comp) {
      stop(attr(comp, "message"))
    }
    assign("GV", gv, envir = .GRASS_CACHE)
    if (nchar(loc) == 0) {
      loc <- read.dcf(gisrc)[1, "LOCATION_NAME"]
    }
  }

  Smess <- paste("GRASS GIS interface loaded ",
    "with GRASS version: ", gv, "\n",
    ifelse(nchar(loc) == 0, "", paste("and location: ", loc, "\n", sep = "")),
    sep = ""
  )
  packageStartupMessage(Smess, appendLF = FALSE)
}

.onUnload <- function(lib, pkg) {
  if (get("INIT_USED", envir = .GRASS_CACHE)) {
    if (get("remove_GISRC", envir = .GRASS_CACHE)) {
      gisrc <- Sys.getenv("GISRC")
      if (file.exists(gisrc)) unlink(gisrc)
      Sys.unsetenv("GISRC")
    }
    unlink_.gislock()
    unset.GIS_LOCK()
  }
  Sys.setenv("GRASS_PAGER" = get(".GRASS_old.GRASS_PAGER", envir = .GRASS_CACHE))
  Sys.setenv("GRASS_MESSAGE_FORMAT" = get(".GRASS_old.GRASS_MESSAGE_FORMAT",
    envir = .GRASS_CACHE
  ))
  rm(.GRASS_CACHE)
}