add sly io issue post

content/blog/2024-04-13-sly-repl-io-issues.md

@@ -0,0 +1,47 @@
++++
+title = "Issue with SBCL console output in Sly"
+date = 2024-04-13
+[taxonomies]
+tags = ["programming"]
+categories = ["lisp"]
++++
+
+# Inconsistent output in REPL
+
+When doing the examples in the _Practical Common Lisp_ book I had confusing output in the repl when prompting the user for CDs using SBCL.
+
+```
+; Dedicated output stream setup (port 46185)
+; Redirecting all output to this MREPL
+; SLY 1.0.43 (#<MREPL mrepl-1-1>)
+CL-USER> (prompt-for-cd)
+Title: Unplugged
+Eric Clapton 
+8
+y
+```
+
+Apparently a similar issue was first found on MacOSX and later confirmed on Arch.
+
+The suggestion was given to disable passing the output via a socket to have higher performance that via the protocol by adding
+
+```
+(setf slynk:*use-dedicated-output-stream* nil)
+```
+
+Since I rather have something working that it being high performant not-working I followed the suggestion which fixed the issue:
+
+
+```
+CL-USER> (prompt-for-cd)
+Title: Bar 
+Artist: Foo Fighters
+Rating: 8
+Ripped: y
+
+y (y or n) y
+(:TITLE "Bar " :ARTIST "Foo Fighters" :RATING 8 :RIPPED T)
+CL-USER>  
+```
+
+so I can continue with the chapter.