R/zzz.R

In optigrab: Command-Line Parsing for an R World

.onAttach <- function( libname, pkgname ) {

  # suppressWarnings( try( v <- utils::packageVersion(pkgname, libname), silent = TRUE ))
  # version <- if( exists('v') ) paste0("-", v ) else ""

  dt <- read.dcf( system.file("DESCRIPTION", package = pkgname ), "Date" )
  yr <- substr(dt,1,4)
  version <- read.dcf( system.file("DESCRIPTION", package = pkgname ), "Version" )

  if( interactive() )
    packageStartupMessage(
        pkgname
      , "-", version
      , ifelse( ! is.na(dt), paste0(' (',dt,')'), '' )
      , " - Copyright \u00a9 ", ifelse(! is.na(yr), yr, '')
      , " Decision Patterns"
      , domain = NA
    )

  options( optigrab = list( 
       help = list()
     , style = gnu_style
     , options = list() 
     )
  )

}