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#!/bin/sh
# Prepend arguments from a file to the given arguments for a command
self=apf
# Require at least two arguments
if [ "$#" -lt 2 ] ; then
printf >&2 '%s: Need an arguments file and a command\n' "$self"
exit 2
fi
# First argument is the file containing the null-delimited arguments
argf=$1 cmd=$2
shift 2
# If the file exists, we'll read it. If it doesn't, this is not an error (think
# personal config files like ~/.vimrc)
if [ -f "$argf" ] ; then
# Create a temporary directory with name in $td, and handle POSIX-ish traps to
# remove it when the script exits.
td=
cleanup() {
[ -n "$td" ] && rm -fr -- "$td"
if [ "$1" != EXIT ] ; then
trap - "$1"
kill "-$1" "$$"
fi
}
for sig in EXIT HUP INT TERM ; do
# shellcheck disable=SC2064
trap "cleanup $sig" "$sig"
done
td=$(mktd "$self") || exit
# Write the arguments in reverse to a temporary file
revf=$td/revf
sed '1!G;$!{h;d}' "$argf" > "$revf" || exit
# Stack up all the arguments from the file. Skip blank lines and comments.
# An empty file is also fine.
while IFS= read -r arg ; do
case $arg in
'#'*) continue ;;
*[![:space:]]*) ;;
*) continue ;;
esac
set -- "$arg" "$@"
done < "$revf"
# We can remove the temporary stuff now, which allows us to exec safely
cleanup ''
fi
# Run the command with the changed arguments
exec "$cmd" "$@"
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