Make Spry a compile-time option

src/blobset.nim

@@ -7,11 +7,12 @@ import ./blobsets, ./blobsets/filestores,
   ./blobsets/httpservers, ./blobsets/httpstores
 
 # Basic Spry
-import spryvm/spryvm
+when defined(spry):
+  import spryvm/spryvm
 
-# Spry extra modules
-import spryvm/sprycore, spryvm/spryextend, spryvm/sprymath, spryvm/spryos, spryvm/spryio,
-  spryvm/spryoo, spryvm/sprystring, spryvm/sprymodules, spryvm/spryreflect, spryvm/sprymemfile,
+  # Spry extra modules
+  import spryvm/sprycore, spryvm/spryextend, spryvm/sprymath, spryvm/spryos, spryvm/spryio,
+    spryvm/spryoo, spryvm/sprystring, spryvm/sprymodules, spryvm/spryreflect, spryvm  /sprymemfile,
     spryvm/spryblock,
     ./blobsets/spryblobs
 
@@ -832,7 +833,8 @@ proc getLine(prompt: string): string =
     stdout.write(prompt)
     result = stdin.readline()
 
-proc spryMain() =
+when defined(spry):
+  proc spryMain() =
     let spry = newInterpreter()
     spry.addCore()
     spry.addExtend()
@@ -917,7 +919,11 @@ when isMainModule:
   of "dump": dumpMain()
   of "ingest": waitFor ingestMain()
   of "server": waitFor serverMain()
-  of "spry": spryMain()
+  of "spry":
+    when defined(spry):
+      spryMain()
+    else:
+      quit "not compiled with Spry interpreter"
   of "check": waitFor checkMain()
   of "replicate": waitFor replicateMain()
   else: quit("no such subcommand " & cmd)