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#!/bin/sh
help() { echo "filter - filter input based on given expression to evaluate
USAGE:
filter [OPTION]... <FILTER_EXPRESSION> [FILES]...
OPTIONS:
-i update files with filtered content
-h show this help message
FILTER_EXPRESSION is a contains the command string that will be executed to test
the input line. {} should be used as a placeholder that will be replaced to the
double-quoted string of the input line. If the command evaluates to true, the
line is printed to stdout.
"; }
err() { printf 'filter: %s\n' "$@" >&2; exit 1; }
while getopts 'ih' o; do case "$o" in
i) iflag=1 ;;
h) help; exit ;;
*) err "invalid option -- '$OPTARG'" ;;
esac done
shift $((OPTIND - 1))
[ "$#" -lt 1 ] && help >&2 && exit 1
filter="$1"; shift
evaluate() {
while IFS= read -r line; do
escaped_line="$(printf "%s\n" "$line" | sed "s|\"|\\\\\\\\\"|")"
cmd="$(printf "%s\n" "$filter" | sed "s|{}|\"$escaped_line\"|")"
eval "$cmd" && printf "%s\n" "$line"
done
}
if [ "$iflag" = 1 ]; then
for file in "$@"; do
[ -z "$1" ] && err "option -i requires file argument and none were passed"
tmp="$(mktemp "/tmp/$file.tmp-filter.XXXXXX")"
evaluate < "$file" > "$tmp"
mv "$tmp" "$file"
done
exit
fi
if [ -n "$1" ]; then
evaluate < "$@"
else
evaluate
fi
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