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Re: "lein repl" malfunctions in Emacs (24.3.1) subprocess?

From: Eli Zaretskii
Subject: Re: "lein repl" malfunctions in Emacs (24.3.1) subprocess?
Date: Tue, 14 Apr 2015 05:38:09 +0300

> Date: Mon, 13 Apr 2015 14:23:47 -0700 (PDT)
> From: address@hidden
> I'm trying to use Emacs as my dev environment for Clojure programming under 
> Windows 8.1. When I open a subprocess (via M-x shell) I get a command prompt 
> as expected. I can then run "lein test" and my unit tests are run as expected 
> -- with output to the shell buffer as expected.
> If, however, I enter "lein repl" then the REPL starts as expected, but is non 
> responsive. For example, if I enter (+ 1 2) at the user=> prompt (followed by 
> Enter) I get no response at all.  The input isn't echoed (as expected) and no 
> output at all appears.
> Note that "lein repl" runs fine at a normal command prompt (or within a 
> subprocess buffer in Epsilon (an Emacs clone.)) This problem occurs on 3 
> different machines.
> This has worked for me in the past so obviously something has broken, but I 
> haven't a clue what it might be or how to troubleshoot.

Likely a buffering issue.  Emacs on Windows runs subprocesses via a
pipe, and many programs then buffer their stdout fully, unlike line
buffering they use when run from a shell prompt.

If "lein repl", whatever that is, has an option to control buffering,
or there's a variable you can set or command you can issue to that
effect inside "lein repl", they will likely fix the problem.

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