libmakepkg: move functions for extracting pkgbuild attributes

Also rename some functions for clarity:
funcgrep -> grep_function
extract_global_var -> extract_global_variable
extract_function_var -> extract_function_variable
pkgbuild_get_attribute -> get_pkgbuild_attribute

Signed-off-by: Allan McRae <allan@archlinux.org>

1 files changed, 111 insertions, 0 deletions

diff --git a/scripts/libmakepkg/util/pkgbuild.sh b/scripts/libmakepkg/util/pkgbuild.sh
new file mode 100644
index 00000000..2e97e4dc
--- /dev/null
+++ b/scripts/libmakepkg/util/pkgbuild.sh
@@ -0,0 +1,111 @@
+#!/bin/bash
+#
+#   pkgbuild.sh - functions to extract information from PKGBUILD files
+#
+#   Copyright (c) 2014-2015 Pacman Development Team <pacman-dev@archlinux.org>
+#
+#   This program is free software; you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation; either version 2 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[ -n "$LIBMAKEPKG_UTIL_PKGBUILD_SH" ] && return
+LIBMAKEPKG_UTIL_PKGBUILD_SH=1
+
+
+have_function() {
+	declare -f "$1" >/dev/null
+}
+
+grep_function() {
+	{ declare -f "$1" || declare -f package; } 2>/dev/null | grep -E "$2"
+}
+
+array_build() {
+	local dest=$1 src=$2 i keys values
+
+	# it's an error to try to copy a value which doesn't exist.
+	declare -p "$2" &>/dev/null || return 1
+
+	# Build an array of the indicies of the source array.
+	eval "keys=(\"\${!$2[@]}\")"
+
+	# Clear the destination array
+	eval "$dest=()"
+
+	# Read values indirectly via their index. This approach gives us support
+	# for associative arrays, sparse arrays, and empty strings as elements.
+	for i in "${keys[@]}"; do
+		values+=("printf -v '$dest[$i]' %s \"\${$src[$i]}\";")
+	done
+
+	eval "${values[*]}"
+}
+
+extract_global_variable() {
+	# $1: variable name
+	# $2: multivalued
+	# $3: name of output var
+
+	local attr=$1 isarray=$2 outputvar=$3 ref
+
+	if (( isarray )); then
+		array_build ref "$attr"
+		[[ ${ref[@]} ]] && array_build "$outputvar" "$attr"
+	else
+		[[ ${!attr} ]] && printf -v "$outputvar" %s "${!attr}"
+	fi
+}
+
+extract_function_variable() {
+	# $1: function name
+	# $2: variable name
+	# $3: multivalued
+	# $4: name of output var
+
+	local funcname=$1 attr=$2 isarray=$3 outputvar=$4 attr_regex= decl= r=1
+
+	if (( isarray )); then
+		printf -v attr_regex '^[[:space:]]* %s\+?=\(' "$2"
+	else
+		printf -v attr_regex '^[[:space:]]* %s\+?=[^(]' "$2"
+	fi
+
+	while read -r; do
+		# strip leading whitespace and any usage of declare
+		decl=${REPLY##*([[:space:]])}
+		eval "${decl/#$attr/$outputvar}"
+
+		# entering this loop at all means we found a match, so notify the caller.
+		r=0
+	done < <(grep_function "$funcname" "$attr_regex")
+
+	return $r
+}
+
+get_pkgbuild_attribute() {
+	# $1: package name
+	# $2: attribute name
+	# $3: multivalued
+	# $4: name of output var
+
+	local pkgname=$1 attrname=$2 isarray=$3 outputvar=$4
+
+	printf -v "$outputvar" %s ''
+
+	if [[ $pkgname ]]; then
+		extract_global_variable "$attrname" "$isarray" "$outputvar"
+		extract_function_variable "package_$pkgname" "$attrname" "$isarray" "$outputvar"
+	else
+		extract_global_variable "$attrname" "$isarray" "$outputvar"
+	fi
+}