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#!/bin/bash
# Similar to getopt, but only extracts recognized switches and leaves all other arguments in place.
#
# Example Usage:
# new_args=$(extract_switches.sh -cpu-only -gpu-only -- "$@")
# eval set -- ${new_args}
# while true; do
# case "$1" in
# -cpu-only) CPU_ONLY=true; shift;;
# -gpu-only) GPU_ONLY=true; shift;;
# --) shift; break;;
# *) echo "Unknown argument: $1"; exit 1;;
# esac
# done
#
# This leaves all unrecognized arguments in $@ for later parsing.
# Parse switches
switches=()
for arg in "$@"; do
case "$arg" in
--help | -h)
cat <<-EOF | cut -c 5-
Usage: extract_switches.sh <switch> [<switch> ...] -- <argv>
Sorts any recognized switches in argv to the front and returns the result.
Unrecognized switches are left in place.
Example Usage:
new_args=\$(extract_switches.sh -cpu-only -gpu-only
eval set -- \${new_args}
while true; do
case "\$1" in
-cpu-only) CPU_ONLY=true; shift;;
-gpu-only) GPU_ONLY=true; shift;;
--) shift; break;;
*) echo "Unknown argument: \$1"; exit 1;;
esac
done
EOF
exit
;;
--)
shift
break
;;
*)
switches+=("$arg")
shift
;;
esac
done
found_switches=()
other_args=()
for arg in "$@"; do
for switch in "${switches[@]}"; do
if [ "$arg" = "$switch" ]; then
found_switches+=("$arg")
continue 2
fi
done
other_args+=("$arg")
done
echo "${found_switches[@]} -- ${other_args[@]}"
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