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clojure.core.server/io-prepl returns immediately with read-line

Description

Per https://ask.clojure.org/index.php/11518/clojure-core-server-io-prepl-doesnt-support-read-line

Repro:

λ clj -Srepro -M -r Clojure 1.10.3 user=> (read-line) Hello, world! "Hello, world!" user=> (clojure.core.server/io-prepl) (read-line) {:tag :ret, :val "\"\"", :ns "user", :ms 2, :form "(read-line)"}

Notice how with io-prepl, (read-line) returns immediately without awaiting for user input and returns an empty string.

Calling either clojure.main/skip-if-eol or clojure.main/skip-whitespace after read+string in clojure.core.server/prepl appears to fix the issue, but it is admittedly unclear to me why that is.

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Created January 27, 2022 at 10:33 PM
Updated January 27, 2022 at 10:34 PM

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