add {load,unset}_PKGBUILD to conf.sh, use it.

There are a bunch of caveats to loading a PKGBUILD file.  This way it is
all done correctly in one place.

unset_PKGBUILD unsets any functions and variables that are normally set in
a PKGBUILD.  The list is far more complete than any existing
implementation.

load_PKGBUILD loads the file given, or "./PKGBUILD" if none is given.  But
first it calls unset_PKGBUILD and then sets CARCH.

1 files changed, 34 insertions, 0 deletions

diff --git a/src/lib/conf.sh b/src/lib/conf.sh
index f6ae91d..2dc5b70 100644
--- a/src/lib/conf.sh
+++ b/src/lib/conf.sh
@@ -150,3 +150,37 @@ set_conf_makepkg() {
 	done
 	return 1
 }
+
+# PKGBUILD (not configuration, per se) #########################################
+
+unset_PKGBUILD() {
+	# This routine is based primarily off of the PKGBUILD(5) man-page,
+	# version 4.1.2, dated 2013-06-18.
+
+	# From the "OPTIONS AND DIRECTIVES" section (in order of mention)
+	unset -v pkgname pkgver
+	unset -f pkgver
+	unset -v pkgrel pkgdesc epoch url license install changelog source
+	unset -v noextract md5sums sha{1,256,384,512}sums groups arch backup
+	unset -v depends makedepends checkdepends optdepends conflicts provides
+	unset -v replaces options
+
+	# From the "PACKAGING FUNCTIONS" section (in order of mention)
+	unset -f package prepare build check
+
+	# From the "PACKAGE SPLITTING" section
+	unset -f $(declare -f|sed -n 's/^\(package_\S*\) ()\s*$/\1/p')
+	unset -v pkgbase
+
+	# These are used by the `librefetch` program
+	unset -v mksource mknoextract mkmd5sums mksha{1,256,384,512}sums
+	unset -v mkdepends
+	unset -f mksource
+}
+
+load_PKGBUILD() {
+	local file=${1:-./PKGBUILD}
+	unset_PKGBUILD
+	CARCH="$(get_conf_makepkg CARCH "`uname -m`")"
+	. "$file"
+}