mk/find-prefix.mk

   1 # $NetBSD: find-prefix.mk,v 1.6 2008/02/10 10:12:13 rillig Exp $
   2 #
   3 # This is a "subroutine" that can be included to find the installation
   4 # prefix of an installed package.
   5 #
   6 # Parameters:
   7 #
   8 # FIND_PREFIX
   9 #       A list of <VARNAME>=<pattern> pairs, where
  10 #
  11 #       * <pattern> is a package wildcard pattern (see pkg_info(8)),
  12 #       * <VARNAME> is the variable that will be set to the
  13 #         installation prefix for the package.
  14 #
  15 # Returns:
  16 #
  17 # <VARNAME>
  18 #       The prefix of the corresponding package, or ${LOCALBASE}
  19 #       if the package is not installed.
  20 #
  21 # Example:
  22 #
  23 # FIND_PREFIX:= M4DIR=gm4
  24 # .include "../../mk/find-prefix.mk"
  25 # # ${M4DIR} now contains the installation prefix for the "gm4" package.
  26 #
  27
  28 .for i in ${FIND_PREFIX}
  29 .  for varname in ${i:C/=.*$//}
  30 .    for pattern in ${i:C/^[^=]*=//}
  31 .      if !defined(${varname})
  32
  33 # XXX: Is this *_DEFAULT variable really necessary? The default value
  34 # can be easily embedded in the shell code. What if VARNAME is set to
  35 # PKG_APACHE, for example?
  36 #
  37 ${varname}_DEFAULT?=    ${LOCALBASE}
  38 _${varname}_cmd=                \
  39         ${PKG_INFO} -qp ${pattern:Q} 2>/dev/null |                      \
  40         { read cmd arg;                                                 \
  41           case "$$arg" in                                               \
  42           "")   ${ECHO} ${${varname}_DEFAULT:Q} ;;                      \
  43           *)    ${ECHO} "$$arg" ;;                                      \
  44           esac; }
  45 ${varname}=             ${_${varname}_cmd:sh}
  46 .      endif
  47 MAKEVARS+=      ${varname}
  48 .    endfor
  49 .  endfor
  50 .endfor