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Diffstat (limited to 'scripts/libmakepkg/util/parseopts.sh.in')
| -rw-r--r-- | scripts/libmakepkg/util/parseopts.sh.in | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/scripts/libmakepkg/util/parseopts.sh.in b/scripts/libmakepkg/util/parseopts.sh.in new file mode 100644 index 00000000..802275e5 --- /dev/null +++ b/scripts/libmakepkg/util/parseopts.sh.in @@ -0,0 +1,173 @@ +#!/bin/bash +# +# parseopts.sh - getopt_long-like parser +# +# Copyright (c) 2012-2016 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/>. +# +# A getopt_long-like parser which portably supports longopts and +# shortopts with some GNU extensions. It does not allow for options +# with optional arguments. For both short and long opts, options +# requiring an argument should be suffixed with a colon. After the +# first argument containing the short opts, any number of valid long +# opts may be be passed. The end of the options delimiter must then be +# added, followed by the user arguments to the calling program. +# +# Recommended Usage: +# OPT_SHORT='fb:z' +# OPT_LONG=('foo' 'bar:' 'baz') +# if ! parseopts "$OPT_SHORT" "${OPT_LONG[@]}" -- "$@"; then +# exit 1 +# fi +# set -- "${OPTRET[@]}" +# Returns: +# 0: parse success +# 1: parse failure (error message supplied) +parseopts() { + local opt= optarg= i= shortopts=$1 + local -a longopts=() unused_argv=() + + shift + while [[ $1 && $1 != '--' ]]; do + longopts+=("$1") + shift + done + shift + + longoptmatch() { + local o longmatch=() + for o in "${longopts[@]}"; do + if [[ ${o%:} = "$1" ]]; then + longmatch=("$o") + break + fi + [[ ${o%:} = "$1"* ]] && longmatch+=("$o") + done + + case ${#longmatch[*]} in + 1) + # success, override with opt and return arg req (0 == none, 1 == required) + opt=${longmatch%:} + if [[ $longmatch = *: ]]; then + return 1 + else + return 0 + fi ;; + 0) + # fail, no match found + return 255 ;; + *) + # fail, ambiguous match + printf "${0##*/}: $(gettext "option '%s' is ambiguous; possibilities:")" "--$1" + printf " '%s'" "${longmatch[@]%:}" + printf '\n' + return 254 ;; + esac >&2 + } + + while (( $# )); do + case $1 in + --) # explicit end of options + shift + break + ;; + -[!-]*) # short option + for (( i = 1; i < ${#1}; i++ )); do + opt=${1:i:1} + + # option doesn't exist + if [[ $shortopts != *$opt* ]]; then + printf "${0##*/}: $(gettext "invalid option") -- '%s'\n" "$opt" >&2 + OPTRET=(--) + return 1 + fi + + OPTRET+=("-$opt") + # option requires optarg + if [[ $shortopts = *$opt:* ]]; then + # if we're not at the end of the option chunk, the rest is the optarg + if (( i < ${#1} - 1 )); then + OPTRET+=("${1:i+1}") + break + # if we're at the end, grab the the next positional, if it exists + elif (( i == ${#1} - 1 )) && [[ $2 ]]; then + OPTRET+=("$2") + shift + break + # parse failure + else + printf "${0##*/}: $(gettext "option requires an argument") -- '%s'\n" "$opt" >&2 + OPTRET=(--) + return 1 + fi + fi + done + ;; + --?*=*|--?*) # long option + IFS='=' read -r opt optarg <<< "${1#--}" + longoptmatch "$opt" + case $? in + 0) + # parse failure + if [[ $optarg ]]; then + printf "${0##*/}: $(gettext "option '%s' does not allow an argument")\n" "--$opt" >&2 + OPTRET=(--) + return 1 + # --longopt + else + OPTRET+=("--$opt") + fi + ;; + 1) + # --longopt=optarg + if [[ $optarg ]]; then + OPTRET+=("--$opt" "$optarg") + # --longopt optarg + elif [[ $2 ]]; then + OPTRET+=("--$opt" "$2" ) + shift + # parse failure + else + printf "${0##*/}: $(gettext "option '%s' requires an argument")\n" "--$opt" >&2 + OPTRET=(--) + return 1 + fi + ;; + 254) + # ambiguous option -- error was reported for us by longoptmatch() + OPTRET=(--) + return 1 + ;; + 255) + # parse failure + printf "${0##*/}: $(gettext "invalid option") '--%s'\n" "$opt" >&2 + OPTRET=(--) + return 1 + ;; + esac + ;; + *) # non-option arg encountered, add it as a parameter + unused_argv+=("$1") + ;; + esac + shift + done + + # add end-of-opt terminator and any leftover positional parameters + OPTRET+=('--' "${unused_argv[@]}" "$@") + unset longoptmatch + + return 0 +} |