bin/n-times: Add working utility

1 files changed, 73 insertions, 0 deletions

diff --git a/bin/n-times b/bin/n-times
new file mode 100755
index 0000000..4fa8b96
--- /dev/null
+++ b/bin/n-times
@@ -0,0 +1,73 @@
+#!/bin/sh
+set -eu
+
+usage() {
+	cat <<-'EOF'
+		Usage:
+		  n-times COUNT -- COMMAND...
+		  n-times -h
+	EOF
+}
+
+help() {
+	cat <<-'EOF'
+
+		Options:
+		  -h, --help    show this message
+
+		  COUNT         the number of times for COMMAND to be executed
+
+
+		Examples:
+
+		  Print 123 5 times:
+
+		    $ n-times 5 echo 123
+	EOF
+}
+
+
+for flag in "$@"; do
+	case "$flag" in
+		--)
+			break
+			;;
+		--help)
+			usage
+			help
+			exit
+			;;
+		*)
+			;;
+	esac
+done
+
+while getopts 'h' flag; do
+	case "$flag" in
+		h)
+			usage
+			help
+			exit
+			;;
+		*)
+			usage >&2
+			exit 2
+			;;
+	esac
+done
+shift $((OPTIND - 1))
+
+
+COUNT="${1:-}"
+shift
+
+eval "$(assert-arg "$COUNT" 'COUNT')"
+
+
+while true; do
+	if [ "$COUNT" = 0 ]; then
+		break
+	fi
+	COUNT=$((COUNT - 1))
+	"$@"
+done