scripts/libmakepkg/util/pkgbuild.sh


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
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
}