working on pform

ulisp-arm.ino

@@ -10493,6 +10493,7 @@ void setup () {
   initkybd();
 #endif
   pfstring(PSTR("uLisp 4.7b "), pserial); pln(pserial);
+  loadimage(NULL);
 }
 
 // Read/Evaluate/Print loop

ulisp-extensions.ino

@@ -29,17 +29,104 @@ fn_now(object *args, object *env)
 	return cons(hours, cons(minutes, cons(seconds, NULL)));
 }
 
+object *
+fn_lambdap(object *arg, object *env)
+{
+	(void) env;
+
+	if (consp(arg)) {
+		arg = car(arg);
+	}
+
+	if (builtin(arg->name) == LAMBDA) {
+		return tee;
+	}
+
+	return nil;
+}
+
+object *
+sp_pform(object *args, object *env)
+{
+	pfun_t pfun = pserial;
+	object *sym = car(args);
+	object *str = car(cdr(args));
+	object *obj;
+
+	if (!boundp(sym, env)) {
+		error2(PSTR("symbol isn't bound"));
+	}
+
+	if (str == nil) {
+		obj = startstring();
+		pfun = pstr;
+	} else if (!eq(str, tee)) {
+		pfun = pstreamfun(args);
+	}
+
+#if defined(gfxsupport)
+	if (pfun == gfxwrite) ppwidth = GFXPPWIDTH;
+#endif
+
+	pln(pfun);
+
+	object *pair = eval(sym, env);
+	object *var  = car(pair);
+	object *val  = cdr(pair);
+
+	if (consp(val)) {
+		pfstring(PSTR("consp val"), pfun); pln(pfun);
+	}
+
+	if (var->name == LAMBDA) {
+		pfstring(PSTR("var->name == LAMBDA"), pfun); pln(pfun);
+	}
+
+	if (builtin(val->name) == LAMBDA) {
+		pfstring(PSTR("builtin -> LAMBDA"), pfun); pln(pfun);
+	}
+
+	// if (consp(val) && symbolp(car(val)) && builtin(car(val)->name) == LAMBDA) {
+	// 	superprint(cons(bsymbol(DEFUN), cons(var, cdr(val))), 0, pfun);
+	// } else if (consp(val) && car(val)->type == CODE) {
+	// 	superprint(cons(bsymbol(DEFCODE), cons(var, cdr(val))), 0, pfun);
+	// } else if (consp(val) && var->name == LAMBDA) {
+	// 	superprint(cons(bsymbol(DEFUN), cons(sym, val)), 0, pfun);
+	// } else {
+	// 	superprint(cons(bsymbol(DEFVAR), cons(var, cons(quote(val), NULL))), 0, pfun);
+	// }
+
+	pln(pfun);
+	ppwidth = PPWIDTH;
+
+	if (str == nil) {
+		return obj;
+	}
+	return nil;
+}
+
 // Symbol names
-const char stringnow[] PROGMEM = "now";
+const char stringlambdap[] PROGMEM	= "lambdap";
+const char stringnow[] PROGMEM		= "now";
+const char stringpform[] PROGMEM	= "pform";
 
 // Documentation strings
+
+const char doclambdap[] PROGMEM		= "(lambdap x)"
+"Returns t if the form passed in is a lambda.";
+
 const char docnow[] PROGMEM = "(now [hh mm ss])\n"
 "Sets the current time, or with no arguments returns the current time\n"
 "as a list of three integers (hh mm ss).";
 
+const char docpform[] PROGMEM = "(pform form str)\n"
+"Print a form to a stream in a manner suitable for writing to storage.";
+
 // Symbol lookup table
 const tbl_entry_t lookup_table2[] PROGMEM = {
+  { stringlambdap, fn_lambdap, 0211, doclambdap },
   { stringnow, fn_now, 0203, docnow },
+  { stringpform, sp_pform, 0322, docpform },
 };
 
 // Table cross-reference functions