Start swank if the environment variable is set.

Added a swank script for Windows.

script/repl.bat

@@ -7,4 +7,8 @@ for /R ./lib %%a in (*.jar) do (
 set CLASSPATH=!CLASSPATH!"
 set CLASSPATH=%CLASSPATH%;src;test;config;data
 echo CLASSPATH=%CLASSPATH%
-java -Xmx1G -cp %CLASSPATH% jline.ConsoleRunner clojure.main -i script/run.clj -r
+
+@rem jline breaks inferior-lisp.
+if not defined LABREPL_SWANK set JLINE=jline.ConsoleRunner
+
+java -Xmx1G -cp %CLASSPATH% %JLINE% clojure.main -i script/run.clj -r

script/run.clj

@@ -1,3 +1,10 @@
+(when-let [run-swank (System/getenv "LABREPL_SWANK")]
+  (println "Starting swank...")
+  ;; Drop the enclosing double quotes from the environment variable and eval it.
+  (load-string (if (re-find #"^\".*\"$" run-swank)
+                 (->> run-swank (drop 1) (butlast) (apply str))
+                 run-swank)))
+
 (require 'labrepl)
 (set! *print-length* 100)
-(labrepl/-main)
+(labrepl/-main)

script/swank.bat

@@ -0,0 +1,4 @@
+@echo off
+setlocal
+set LABREPL_SWANK="(require 'swank.swank) (swank.swank/start-repl 4005)"
+call %~dp0repl.bat