eclass/glo-utils.eclass

   1 # Copyright 1999-2009 Gentoo Foundation
   2 # Distributed under the terms of the GNU General Public License v2
   3 # $Header: $
   4 #
   5 # This eclass contains various utilities used in the Gentoo Lisp overlay
   6 #
   7 # Public functions:
   8 #
   9 # glo_usev flagname [<if_yes> [<if_no>]]
  10 #   If $(use FLAGNAME) return true, echo IF_YES to standard output,
  11 #   otherwise echo IF_NO. IF_YES defaults to FLAGNAME if not specified
  12 #
  13 # glo_best_flag flag+
  14 #   Echo to stdout the first active USE flag among those supplied as parameters.
  15 #   If none are active, echo the first one
  16 #
  17
  18 glo_usev() {
  19         if [[ $# < 1 || $# > 3 ]]; then
  20                 echo "Usage: ${0} flag [if_yes [if_no]]"
  21                 die "${0}: wrong number of arguments: $#"
  22         fi
  23         local if_yes="${2:-${1}}" if_no="${3}"
  24         if useq ${1} ; then
  25                 printf "%s" "${if_yes}"
  26                 return 0
  27         else
  28                 printf "%s" "${if_no}"
  29                 return 1
  30         fi
  31 }
  32
  33 glo_best_flag() {
  34         if [[ $# < 1 ]]; then
  35                 echo "Usage: ${0} flag+"
  36                 die "${0}: wrong number of arguments: $#"
  37         fi
  38         for flag in $@ ; do
  39                 if use ${flag} ; then
  40                         echo ${flag}
  41                         return
  42                 fi
  43         done
  44         echo ${1}
  45 }