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-rw-r--r--scripts/libmakepkg/util/parseopts.sh.in173
1 files changed, 173 insertions, 0 deletions
diff --git a/scripts/libmakepkg/util/parseopts.sh.in b/scripts/libmakepkg/util/parseopts.sh.in
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+++ b/scripts/libmakepkg/util/parseopts.sh.in
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+#!/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
+}