read

(read) / (read reader) / (read reader eof-error? eof-value) / (read opts reader)

Reads one datum from a reader and leaves the reader right after it, like the oracle's PushbackReader, answering what read-string answers for the same text. The reader is a clojure.java.io/reader (a java.io.PushbackReader over one is that reader), (java.io.PushbackReader. (java.io.StringReader. s)) (a string reader on every backend) or *in*, which (read) reads; a host reader is refused. At the end of input (read reader) signals EOF while reading, while (read reader false v) and (read {:eof v} reader) answer v; an end inside a datum always signals. A fourth argument (recursive?) is accepted and ignored. Runs on every backend (a file needs a --dir preopen on wasm); as a value, zero to four arguments.

(1 2)
:k
:eof

What spit wrote reads back, records included:

$ cat backup.clj
(defrecord Message [sender text])
(spit "/tmp/backup.clj" (list (->Message "ann" "hi")))
(prn (read (java.io.PushbackReader. (clojure.java.io/reader "/tmp/backup.clj"))))
$ rontolisp backup.clj
(#user.Message{:sender "ann", :text "hi"})