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|
#!/bin/sh
set -eu
usage() {
cat <<-'EOF'
Usage:
pre [-c COLOR] PREFIX
pre -h
EOF
}
help() {
cat <<-'EOF'
Options:
-c COLOR ANSI color to be used on the prefix text
-h, --help show this message
PREFIX the string to insert at the beginning
Prefix STDIN with PREFIX.
Examples:
Prefix with 'database':
$ ./run-db.sh | pre 'database'
Prefix with yellow 'numbers':
$ seq 10 | pre -c yellow numbers
EOF
}
for flag in "$@"; do
case "$flag" in
--)
break
;;
--help)
usage
help
exit
;;
*)
;;
esac
done
COLOR=''
while getopts 'c:h' flag; do
case "$flag" in
c)
COLOR="$OPTARG"
;;
h)
usage
help
exit
;;
*)
usage >&2
exit 2
;;
esac
done
shift $((OPTIND - 1))
PREFIX="${1:-}"
eval "$(assert-arg -- "$PREFIX" 'PREFIX')"
while read -r line; do
if [ -z "$COLOR" ]; then
printf '%s: %s\n' "$PREFIX" "$line"
else
printf '%s: %s\n' "$(color -c "$COLOR" "$PREFIX")" "$line"
fi
done
|
