Builtins: Added a hack so that builtins would behave correctly no matter if they're called from eval or execute

src/fsh.nim

@@ -255,7 +255,8 @@ proc parseCommand(cmd: string): seq[string] =
       else: newitem.add(c)
 
 # runBuiltin runs a shell builtin
-proc runBuiltin(builtin: string, args: openArray[string]): (string, int) =
+# the mode is 0 for eval and 1 for execute
+proc runBuiltin(builtin: string, args: openArray[string], mode = 0): (string, int) =
   case builtin:
     of "set":
       if args.len < 2:
@@ -304,12 +305,19 @@ proc runBuiltin(builtin: string, args: openArray[string]): (string, int) =
         # Check if this is the last item, if so just execute it
         # It's an else branch basically
         if i == args.high:
-          return ("", execute(args[i]))
+          if mode == 0:
+            return (args[i].eval, 0)
+          elif mode == 1:
+            return ("", args[i].execute)
         # Get the exitcode of the current arg (the condition)
         let exitcode = args[i].execute
         if exitcode == 0:
           # if the condition is true
-          return ("", args[i+1].execute)
+          if mode == 0:
+            return (args[i+1].eval, 0)
+          elif mode == 1:
+            return ("", args[i+1].execute)
+          else: raise newException(Exception, "mode must be either 0 or 1")
         else:
           # if the condition is false
           i.inc
@@ -345,10 +353,14 @@ proc runBuiltin(builtin: string, args: openArray[string]): (string, int) =
         let vari = varval_parsed[0]
         let val = varval_parsed[1]
         shellVariables[numframes-1][vari]=val
-      result[0] = args[1].eval
+      if mode == 0:
+        result[0] = args[1].eval
+        result[1] = 0
+      elif mode == 1:
+        result[0]=""
+        result[1]=args[1].execute
       discard shellVariables.pop
       numframes.dec
-      result[1] = 0
     else:
       raise newShellCommandException("No such builtin implemented", builtin)
 
@@ -362,7 +374,7 @@ proc execute(cmd: string): int =
     let progname = parsed[0]
     let args = parsed[1..parsed.high]
     if progname in builtins:
-      let res=runBuiltin(progname, args)
+      let res=runBuiltin(progname, args, 1)
       stdout.write(res[0])
       result=res[1]
       continue
@@ -384,7 +396,7 @@ proc eval(cmd: string): string =
     let progname=parsed[0]
     let args = parsed[1..parsed.high]
     if progname in builtins:
-      result = runBuiltin(progname, args)[0]
+      result = runBuiltin(progname, args, 0)[0]
       continue
     try:
       let ps = startProcess(progname, args=args, options={poUsePath})