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# $NetBSD: find-prefix.mk,v 1.7 2008/02/10 10:30:58 rillig Exp $
#
# This is a "subroutine" that can be included to find the installation
# prefix of an installed package.
#
# Parameters:
#
# FIND_PREFIX
# A list of <VARNAME>=<pattern> pairs, where
#
# * <pattern> is a package wildcard pattern (see pkg_info(8)),
# * <VARNAME> is the variable that will be set to the
# installation prefix for the package.
#
# Returns:
#
# <VARNAME>
# The prefix of the corresponding package, or ${LOCALBASE}
# if the package is not installed.
#
# Example:
#
# FIND_PREFIX:= M4DIR=gm4
# .include "../../mk/find-prefix.mk"
# # ${M4DIR} now contains the installation prefix for the "gm4" package.
#

.for i in ${FIND_PREFIX}
. for varname in ${i:C/=.*$//}
. for pattern in ${i:C/^[^=]*=//}
. if !defined(${varname})

# XXX: Is this *_DEFAULT variable really necessary? The default value
# can be easily embedded in the shell code. What if VARNAME is set to
# PKG_APACHE, for example?
#
${varname}_DEFAULT?= ${LOCALBASE}
_${varname}_cmd= \
${PKG_INFO} -qp ${pattern:Q} 2>/dev/null | \
{ read cmd arg; \
case "$$arg" in \
"") ${ECHO} ${${varname}_DEFAULT:Q} ;; \
*) ${ECHO} "$$arg" ;; \
esac; }
${varname}= ${_${varname}_cmd:sh}
. endif
MAKEVARS+= ${varname}
. endfor
. endfor
.endfor
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