Add script for doing djb2-based term colorization

utils/scripts/hash-colorize.sh

@@ -0,0 +1,41 @@
+#!/bin/sh
+# env
+# Written in 2021 by Lucas
+# CC0 1.0 Universal/Public domain - No rights reserved
+#
+# To the extent possible under law, the author(s) have dedicated all
+# copyright and related and neighboring rights to this software to the
+# public domain worldwide. This software is distributed without any
+# warranty. You should have received a copy of the CC0 Public Domain
+# Dedication along with this software. If not, see
+# <http://creativecommons.org/publicdomain/zero/1.0/>.
+
+djb2()
+{
+	_djb2_s=$1 _djb2_h=${2:-5381}
+	while [ ${#_djb2_s} -gt 0 ]; do
+		_djb2_c=$(printf "%u" "'${_djb2_s%${_djb2_s#?}}")
+		_djb2_s=${_djb2_s#?}
+		_djb2_h=$(( ((($_djb2_h << 5) + $_djb2_h) ^ $_djb2_c) & 65535 ))
+	done
+	printf "%u\n" $_djb2_h
+}
+
+hash_colorize()
+{
+	_h=
+	while :; do
+		_h=$(djb2 "$1" $_h)
+		# removes bias in number selection. Taken from
+		# arc4random_uniform source code.
+		[ $_h -ge 4 ] && break
+	done
+	_h=$(( $_h % 12 ))
+	tput setaf $(( $_h < 6 ? 1 + $_h : 9 + $_h - 6 )) 0 0
+}
+
+for a; do
+	hash_colorize "$a"
+	printf "%s\n" "$a"
+	tput sgr0
+done