Move Git repository into ~/.usr/.git/

1 files changed, 74 insertions, 0 deletions

diff --git a/bin/clamp b/bin/clamp
new file mode 100755
index 0000000..a40b823
--- /dev/null
+++ b/bin/clamp
@@ -0,0 +1,74 @@
+#!/bin/sh
+set -eu
+
+usage() {
+	cat <<-'EOF'
+		Usage:
+		  clamp NUMBER MIN MAX
+		  clamp -h
+	EOF
+}
+
+help() {
+	cat <<-'EOF'
+
+		Options:
+		  -h, --help    show this message
+
+		Clamp the NUMBER between MIN and MAX.
+	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))
+
+assert_arg() {
+	if [ -z "$1" ]; then
+		printf 'Missing %s\n\n' "$2" >&2
+		usage >&2
+		exit 2
+	fi
+}
+
+NUMBER="${1:-}"
+MIN="${2:-}"
+MAX="${3:-}"
+
+assert_arg "$NUMBER" 'NUMBER'
+assert_arg "$MIN"    'MIN'
+assert_arg "$MAX"    'MAX'
+
+
+if [ "$MIN" -gt "$MAX" ]; then
+	printf 'MIN (%s) is greater then MAX (%s).\n' "$MIN" "$MAX" >&2
+	exit 2
+fi
+
+min -- "$(max -- "$NUMBER" "$MIN")" "$MAX"