+# Wrapper for bash's getopts.
+#
+# Aborts on programming errors such as missing or invalid option string. On
+# success $result contains shell code that can be eval'ed. For each defined
+# option x, the local variable o_x will be created when calling eval "$result".
+# o_x contains true/false for options without an argument or the emtpy string/the
+# given argument, depending on whether this option was contained in the "$@"
+# array.
+#
+# Example:
+# gsu_getopts abc:x:y
+# eval "$result"
+# [[ $ret -lt 0 ]] && return
+#
+# [[ "$o_a" = "true ]] && echo "The -a flag was given"
+# [[ -n "$o_c" ]] && echo "The -c option was given with arg $o_c"
+gsu_getopts()
+{
+ local i c tab=' ' cr='
+'
+
+ gsu_check_arg_count $# 1 1
+ if [[ $ret -lt 0 ]]; then
+ gsu_err_msg
+ exit 1
+ fi
+
+ ret=-$E_GSU_GETOPTS
+ result="invalid optstring $1"
+ if [[ -z "$1" ]] || grep -q '::' <<< "$1" ; then
+ gsu_err_msg
+ exit 1
+ fi
+
+ for ((i=0; i < ${#1}; i++)); do
+ c=${1:$i:1}
+ case "$c" in
+ [a-zA-Z:]);;
+ *)
+ ret=-$E_GSU_GETOPTS
+ result="invalid character $c in optstring"
+ gsu_err_msg
+ exit 1
+ esac
+ done
+ result="local opt"
+ for ((i=0; i < ${#1}; i++)); do
+ c1=${1:$i:1}
+ c2=${1:$(($i + 1)):1}
+ result+=" o_$c1"
+ if [[ "$c2" = ":" ]]; then
+ let i++
+ else
+ result+="=false"
+ fi
+ done
+ result+="
+ OPTIND=1
+ while getopts $1 opt \"\$@\"; do
+ case \"\$opt\" in
+"
+ for ((i=0; i < ${#1}; i++)); do
+ c1=${1:$i:1}
+ c2=${1:$(($i + 1)):1}
+ result+="$tab$tab$c1) o_$c1="
+ if [[ "$c2" = ":" ]]; then
+ result+="\"\$OPTARG\""
+ let i++
+ else
+ result+="true"
+ fi
+ result+=";;$cr"
+ done
+ result+="
+ *)
+ ret=-\$E_GSU_GETOPTS
+ result=\"invalid option given\"
+ return
+ ;;
+ esac
+ done
+ shift \$((\$OPTIND - 1))
+"
+ ret=$GSU_SUCCESS
+}
+export -f gsu_getopts
+