mirror of
https://github.com/moparisthebest/pacman
synced 2024-12-22 15:58:50 -05:00
60d2588192
Fun fact about bash: the below is valid and will only ever print 'a'!
fn() {
continue 2
}
for x in {1..5}; do
for y in {a..e}; do
echo "$y"
fn
done
done
Signed-off-by: Dave Reisner <dreisner@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>
138 lines
3.1 KiB
Bash
138 lines
3.1 KiB
Bash
# getopt-like parser
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parseopts() {
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local opt= optarg= i= shortopts=$1
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local -a longopts=() unused_argv=()
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shift
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while [[ $1 && $1 != '--' ]]; do
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longopts+=("$1")
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shift
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done
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shift
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longoptmatch() {
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local o longmatch=()
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for o in "${longopts[@]}"; do
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if [[ ${o%:} = "$1" ]]; then
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longmatch=("$o")
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break
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fi
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[[ ${o%:} = "$1"* ]] && longmatch+=("$o")
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done
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case ${#longmatch[*]} in
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1)
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# success, override with opt and return arg req (0 == none, 1 == required)
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opt=${longmatch%:}
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if [[ $longmatch = *: ]]; then
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return 1
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else
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return 0
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fi ;;
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0)
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# fail, no match found
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return 255 ;;
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*)
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# fail, ambiguous match
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printf "@SCRIPTNAME@: $(gettext "option '%s' is ambiguous; possibilities:")" "--$1"
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printf " '%s'" "${longmatch[@]%:}"
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printf '\n'
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return 254 ;;
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esac >&2
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}
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while (( $# )); do
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case $1 in
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--) # explicit end of options
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shift
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break
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;;
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-[!-]*) # short option
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for (( i = 1; i < ${#1}; i++ )); do
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opt=${1:i:1}
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# option doesn't exist
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if [[ $shortopts != *$opt* ]]; then
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printf "@SCRIPTNAME@: $(gettext "invalid option") -- '%s'\n" "$opt" >&2
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OPTRET=(--)
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return 1
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fi
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OPTRET+=("-$opt")
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# option requires optarg
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if [[ $shortopts = *$opt:* ]]; then
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# if we're not at the end of the option chunk, the rest is the optarg
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if (( i < ${#1} - 1 )); then
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OPTRET+=("${1:i+1}")
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break
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# if we're at the end, grab the the next positional, if it exists
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elif (( i == ${#1} - 1 )) && [[ $2 ]]; then
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OPTRET+=("$2")
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shift
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break
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# parse failure
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else
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printf "@SCRIPTNAME@: $(gettext "option requires an argument") -- '%s'\n" "$opt" >&2
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OPTRET=(--)
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return 1
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fi
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fi
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done
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;;
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--?*=*|--?*) # long option
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IFS='=' read -r opt optarg <<< "${1#--}"
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longoptmatch "$opt"
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case $? in
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0)
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# parse failure
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if [[ $optarg ]]; then
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printf "@SCRIPTNAME@: $(gettext "option '%s' does not allow an argument")\n" "--$opt" >&2
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OPTRET=(--)
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return 1
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# --longopt
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else
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OPTRET+=("--$opt")
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fi
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;;
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1)
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# --longopt=optarg
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if [[ $optarg ]]; then
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OPTRET+=("--$opt" "$optarg")
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# --longopt optarg
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elif [[ $2 ]]; then
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OPTRET+=("--$opt" "$2" )
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shift
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# parse failure
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else
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printf "@SCRIPTNAME@: $(gettext "option '%s' requires an argument")\n" "--$opt" >&2
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OPTRET=(--)
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return 1
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fi
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;;
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254)
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# ambiguous option -- error was reported for us by longoptmatch()
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OPTRET=(--)
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return 1
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;;
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255)
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# parse failure
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printf "@SCRIPTNAME@: $(gettext "invalid option") '--%s'\n" "$opt" >&2
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OPTRET=(--)
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return 1
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;;
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esac
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;;
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*) # non-option arg encountered, add it as a parameter
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unused_argv+=("$1")
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;;
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esac
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shift
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done
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# add end-of-opt terminator and any leftover positional parameters
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OPTRET+=('--' "${unused_argv[@]}" "$@")
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unset longoptmatch
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return 0
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}
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