Builtins, exec / eval: Builtins can return statuses now, not used at all now though

src/fsh.nim

@@ -242,13 +242,13 @@ proc parseCommand(cmd: string): seq[string] =
       else: newitem.add(c)
 
 # runBuiltin runs a shell builtin
-proc runBuiltin(builtin: string, args: openArray[string]): string =
+proc runBuiltin(builtin: string, args: openArray[string]): (string, int) =
   case builtin:
     of "set":
       if args.len < 2:
         raise newShellCommandException("Not enough arguments provided", "set")
       shellVariables[args[0]] = args[1..^1].join(" ")
-      return ""
+      return ("", 0)
     of "setenv":
       if args.len < 2:
         raise newShellCommandException("Not enough arguments provided", "setenv")
@@ -257,11 +257,11 @@ proc runBuiltin(builtin: string, args: openArray[string]): string =
         putEnv(args[0], args[1..^1].join(":"))
       except OSError as e:
         raise newShellCommandException(e.msg, "setenv")
-      return ""
+      return ("", 0)
     of "echo":
       if args[0] == "-n":
-        return args[1..^1].join(" ")
-      return args.join(" ") & "\p"
+        return (args[1..^1].join(" "), 0)
+      return (args.join(" ") & "\p", 0)
     of "exit":
       if args.len == 0:
         quit(0)
@@ -289,13 +289,14 @@ proc execute(cmd: string): int =
   let strm=cmd.newStringStream
   while not strm.atEnd:
     let parsed = strm.readCommand.parseCommand
-    if parsed == @[]:
+    if parsed == @[] or parsed == @[""]:
       continue
     let progname = parsed[0]
     let args = parsed[1..parsed.high]
     if progname in builtins:
-      stdout.write(runBuiltin(progname, args))
-      result = 0
+      let res=runBuiltin(progname, args)
+      stdout.write(res[0])
+      result=res[1]
       continue
     try:
       let ps = startProcess(progname, args=args, options={poUsePath, poParentStreams})
@@ -310,12 +311,12 @@ proc eval(cmd: string): string =
   let strm=cmd.newStringStream
   while not strm.atEnd():
     let parsed = strm.readCommand.parseCommand
-    if parsed == @[]:
+    if parsed == @[] or parsed == @[""]:
       continue
     let progname=parsed[0]
     let args = parsed[1..parsed.high]
     if progname in builtins:
-      result = runBuiltin(progname, args)
+      result = runBuiltin(progname, args)[0]
       continue
     try:
       let ps = startProcess(progname, args=args, options={poUsePath})