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|
#!/bin/bash
#
# parseopts.sh - getopt_long-like parser
#
# Copyright (c) 2012-2019 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. For both short and long opts,
# options requiring an argument should be suffixed with a colon, and
# options with optional arguments should be suffixed with a question
# mark. 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.
#
# Options with optional arguments will be returned as "--longopt=optarg"
# for longopts, or "-o=optarg" for shortopts. This isn't actually a valid
# way to pass an optional argument with a shortopt on the command line,
# but is done by parseopts to enable the caller script to split the option
# and its optarg easily.
#
# Recommended Usage:
# OPT_SHORT='fb:zq?'
# OPT_LONG=('foo' 'bar:' 'baz' 'qux?')
# 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 ${#longmatch[*]} in
1)
# success, override with opt and return arg req (0 == none, 1 == required, 2 == optional)
opt=${longmatch%[:?]}
case $longmatch in
*:) return 1 ;;
*\?) return 2 ;;
*) return 0 ;;
esac
;;
0)
# fail, no match found
return 255 ;;
*)
# fail, ambiguous match
printf "${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}
case $shortopts in
# option requires optarg
*$opt:*)
# if we're not at the end of the option chunk, the rest is the optarg
if (( i < ${#1} - 1 )); then
OPTRET+=("-$opt" "${1:i+1}")
break
# if we're at the end, grab the the next positional, if it exists
elif (( i == ${#1} - 1 && $# > 1 )); then
OPTRET+=("-$opt" "$2")
shift
break
# parse failure
else
printf "${0##*/}: $(gettext "option requires an argument") -- '%s'\n" "$opt" >&2
OPTRET=(--)
return 1
fi
;;
# option's optarg is optional
*$opt\?*)
# if we're not at the end of the option chunk, the rest is the optarg
if (( i < ${#1} - 1 )); then
OPTRET+=("-$opt=${1:i+1}")
break
# option has no optarg
else
OPTRET+=("-$opt")
fi
;;
# option has no optarg
*$opt*)
OPTRET+=("-$opt")
;;
# option doesn't exist
*)
printf "${0##*/}: $(gettext "invalid option") -- '%s'\n" "$opt" >&2
OPTRET=(--)
return 1
;;
esac
done
;;
--?*=*|--?*) # long option
IFS='=' read -r opt optarg <<< "${1#--}"
longoptmatch "$opt"
case $? in
0)
# parse failure
if [[ $1 = *=* ]]; then
printf "${0##*/}: $(gettext "option '%s' does not allow an argument")\n" "--$opt" >&2
OPTRET=(--)
return 1
# --longopt
else
OPTRET+=("--$opt")
fi
;;
1)
# --longopt=optarg
if [[ $1 = *=* ]]; then
OPTRET+=("--$opt" "$optarg")
# --longopt optarg
elif (( $# > 1 )); then
OPTRET+=("--$opt" "$2" )
shift
# parse failure
else
printf "${0##*/}: $(gettext "option '%s' requires an argument")\n" "--$opt" >&2
OPTRET=(--)
return 1
fi
;;
2)
# --longopt=optarg
if [[ $1 = *=* ]]; then
OPTRET+=("--$opt=$optarg")
# --longopt
else
OPTRET+=("--$opt")
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
}
|
