R/AAA.R

In rgrass7: Interface Between GRASS 7 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("useGDAL", TRUE, envir=.GRASS_CACHE)
  assign("stop_on_no_flags_paras", TRUE, envir=.GRASS_CACHE)
  assign("plugin", NULL, 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)
}

.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 ( !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)
}