Added USERLIB with prepend and set.

Added a q shortcut to quote
get-doc and set-doc no longer conditionally evaluate args
Fixed bug in let, documented potential performance improvements
upped default history to 5k lines

snippets/userlib.rls

@@ -0,0 +1,30 @@
+;; relish: versatile lisp shell
+;; Copyright (C) 2021 Aidan Hahn
+;;
+;; This program is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+;;
+;; USERLIB
+;; This file contains a plethora of useful features that are not shipped in the STL
+
+(def prepend
+'takes a list and appends an element to the back of it.
+ returns prepended list'
+  (elem list)
+  (reverse (append (reverse list) elem)))
+
+(def set
+'sets an existing variable without touching its docstring'
+  (var val)
+  (let ((doc (get-doc var)))
+    (def (eval var) doc val)))