ps1test: Add a PS1 tester

ps1test

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+#! /bin/bash
+#
+# ps1test
+# Tests your bash PS1
+# Copyright (C) 2020 Vintage Salt <rehashedsalt@cock.li>
+#
+# Distributed under terms of the MIT license.
+#
+
+main() {
+	. ~/.profile
+	. ~/.bashrc
+	printf "Default:\n"
+	printps1						# Test a default ps1
+	false || printps1					# Test after command failure
+	PWD=~/Documents printps1				# Test in a subdir of ~
+	PWD=/tmp printps1					# Test in a world-writeable dir
+	PWD=/usr/local printps1					# Test in unwriteable dir
+	PWD=/dir/that/doesnt/exist printps1			# Test in dir that doesn't exist
+	printf "\nDefault, different user:\n"
+	USER=notme printps1					# Test as another user
+	printf "\nSame user, different machine:\n"
+	SSH_CLIENT=notme HOSTNAME=notme printps1		# Test over fake SSH
+	printf "\nForeign machine, foreign user:\n"
+	USER=notme SSH_CLIENT=notme HOSTNAME=notme printps1	# Test both of the above
+}
+
+hostname() {
+	# We have this little stub here to intercept calls to hostname
+	echo "$HOSTNAME"
+}
+
+printps1() {
+	# Print the PS1, with some substitutions
+	"$PROMPT_COMMAND" > /dev/null 2>&1
+	PS1="${PS1//\\[/}"
+	PS1="${PS1//\\]/}"
+	PS1="${PS1//\\w/$PWD}"
+	PS1="${PS1//$HOME/\~}"
+	printf "\t$PS1\n"
+}
+
+
+main "$@"
+