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-rw-r--r--scripts/library/README20
-rw-r--r--scripts/library/parseopts.sh141
2 files changed, 161 insertions, 0 deletions
diff --git a/scripts/library/README b/scripts/library/README
index 1e9c962b..f43873f3 100644
--- a/scripts/library/README
+++ b/scripts/library/README
@@ -13,3 +13,23 @@ A getopt replacement to avoids portability issues, in particular the
lack of long option name support in the default getopt provided by some
platforms.
Usage: parse_option $SHORT_OPTS $LONG_OPTS "$@"
+
+parseopts.sh:
+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.
+
+Reccommended 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)
diff --git a/scripts/library/parseopts.sh b/scripts/library/parseopts.sh
new file mode 100644
index 00000000..11589ce3
--- /dev/null
+++ b/scripts/library/parseopts.sh
@@ -0,0 +1,141 @@
+# getopt-like parser
+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 "@SCRIPTNAME@: $(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 "@SCRIPTNAME@: $(gettext "invalid option") -- '%s'\n" "$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 "@SCRIPTNAME@: $(gettext "option requires an argument") -- '%s'\n" "$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 "@SCRIPTNAME@: $(gettext "option '%s' does not allow an argument")\n" "--$opt" >&2
+ OPTRET=(--)
+ return 1
+ # --longopt
+ else
+ OPTRET+=("--$opt")
+ shift
+ continue 2
+ fi
+ ;;
+ 1)
+ # --longopt=optarg
+ if [[ $optarg ]]; then
+ OPTRET+=("--$opt" "$optarg")
+ shift
+ # --longopt optarg
+ elif [[ $2 ]]; then
+ OPTRET+=("--$opt" "$2" )
+ shift 2
+ # parse failure
+ else
+ printf "@SCRIPTNAME@: $(gettext "option '%s' requires an argument")\n" "--$opt" >&2
+ OPTRET=(--)
+ return 1
+ fi
+ continue 2
+ ;;
+ 254)
+ # ambiguous option -- error was reported for us by longoptmatch()
+ OPTRET=(--)
+ return 1
+ ;;
+ 255)
+ # parse failure
+ printf "@SCRIPTNAME@: $(gettext "invalid option") '--%s'\n" "$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
+}