Let: Let works now, somehow. I fixed a bunch of things but this cart is still fundimentaly broken

src/fsh.nim

@@ -19,13 +19,14 @@ for k, v in envPairs():
   envVariables[k]=v
 
 # list of builtin commands
-let builtins: array[6, string] = [
+let builtins: array[7, string] = [
 "set",
 "setenv",
 "echo",
 "exit",
 "if",
 "cd",
+"let",
 ]
 
 # number of frames to be used for builtins like set
@@ -92,8 +93,10 @@ proc readLiteral(strm: Stream): string =
     case c:
       of '{':
         numbraces.inc
+        result.add('{')
       of '}':
         numbraces = numbraces - 1
+        if numbraces != 0: result.add('}')
       of '\\':
         if strm.peekChar notin {'{', '}'}: result.add(strm.readChar)
         result.add(strm.readChar)
@@ -195,7 +198,7 @@ proc readVariable(strm: Stream): string =
 # evalVariable finds a value of a variable
 proc evalVariable(vari: string): string =
   if vari == "$": return "$"
-  for i in shellVariables.high..shellVariables.low:
+  for i in countdown((numframes-1), 0):
     let frame = shellVariables[i]
     if frame.hasKey(vari): return frame[vari]
   if envVariables.hasKey(vari):
@@ -329,6 +332,23 @@ proc runBuiltin(builtin: string, args: openArray[string]): (string, int) =
           return ("", 0)
       except OsError as e:
         raise newShellCommandException("No such directory", "cd")
+    of "let":
+      if args.len < 2:
+        raise newShellCommandException("Not enough arguments provided", "let")
+      shellVariables.add(newStringTable(modeCaseSensitive))
+      numframes.inc
+      let varvals = args[0].parseCommand
+      for varval in varvals:
+        let varval_parsed = varval.parseCommand
+        if varval_parsed.len < 2:
+          raise newShellCommandException("Missingvalue to go with key", "let")
+        let vari = varval_parsed[0]
+        let val = varval_parsed[1]
+        shellVariables[numframes-1][vari]=val
+      result[0] = args[1].eval
+      discard shellVariables.pop
+      numframes.dec
+      result[1] = 0
     else:
       raise newShellCommandException("No such builtin implemented", builtin)