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#!/bin/bash
# Copyright 2019 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
short_usage() {
echo 'Usage: sor SNIPPET...'
}
help() {
short_usage
cat <<EOF
For each line from standard input, evaluate the specified SNIPPETs under Bash
with the line as the argument. Print the line if any snippet exits with
status 0.
-0, --null separate input and output filenames by null
--help display this help and exit
EOF
}
ask_for_help() {
echo "Try 'sor --help' for more information."
}
read_filename() {
local null_terminate="$1"
local target_var="$2"
if [ "$null_terminate" = "true" ]; then
IFS= read -r -d '' "$target_var"
else
read "$target_var"
fi
}
print_filename() {
local null_terminate="$1"
local filename="$2"
if [ "$null_terminate" = "true" ]; then
printf '%s\0' "$filename"
else
echo "$filename"
fi
}
if ! temp=$(getopt -s bash -n sor -o '0' -l null,help -- "$@"); then
ask_for_help >&2
exit 1
fi
eval set -- "$temp"
unset temp
null_terminate="false"
while true; do
case "$1" in
--help)
help
exit 0
;;
-0|--null)
shift
null_terminate="true"
;;
--)
shift
break
;;
*)
echo >&2 'Internal error; please report.'
exit 1
;;
esac
done
while read_filename "$null_terminate" file; do
for test in "$@"; do
if eval "$test \"$file\""; then
print_filename "$null_terminate" "$file"
continue 2
fi
done
done
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