REPL

With no file, --source-language clojure starts a Clojure REPL (clojure> prompt). A form may span lines; completeness is decided by bracket counting over ()[]{} outside strings and comments. Definitions typed at separate prompts see each other, as they would in one file: every buffer declares its top-level def/defn names before it runs, so a later buffer may call what an earlier one defined. An (ns name) or (in-ns 'name) buffer switches the *ns* the ::-keywords below it resolve against, like a file's own ns form. The value echo renders in Clojure notation, readably; a top-level def, defn, defn-, defmacro, defmulti or defonce echoes the var it defined (#'user/twice), and a defonce over a bound var nil. defprotocol echoes its name (P), defrecord and deftype their class name (user.R), declare the last name's var, and a def nested in another form its var as well. In a file a nested def answers the value.

Like the oracle's REPL, *1, *2 and *3 hold the values of the last three inputs (an ns input records nil) and *e the last exception an input threw, which leaves them alone; a refusal while the input is read or lowered is no exception and records nothing. *repl* is true and bound, *file* is "NO_SOURCE_PATH" and *source-path* "NO_SOURCE_FILE".

$ rontolisp --source-language clojure
clojure> (defn twice [x] (* 2 x))
#'user/twice
clojure> (twice 21)
42
clojure> [*1 *2]
[42 #'user/twice]
clojure> (/ 1 0)
Error: Division by zero
clojure> (ex-message *e)
"Division by zero"