Return Golang bools from Objective-C functions that return BOOL.

Move nswrap command to cmd/nswrap.

cmd/nswrap/main.go

@@ -168,8 +168,15 @@ func Start() (err error) {
 		// If clang fails it still prints out the AST, so we have to run it
 		// again to get the real error.
 		//errBody, _ := exec.Command("clang", cargs...).CombinedOutput()
-
+		var txt string
-		panic("clang failed: " + err.Error() + ":\n\n")
+		switch x := err.(type) {
+		case *exec.ExitError:
+			txt = string(x.Stderr)
+		default:
+			txt = err.Error()
+		}
+		fmt.Printf("clang failed:\n%s\n", txt)
+		os.Exit(-1)
 	}
 
 	lines := readAST(astPP)

types/convert.go

@@ -350,7 +350,12 @@ func GoToC(name string, pnames []string, rtype *Type, ptypes []*Type) string {
 		if IsGoInterface(rtgt) {
 			rtgt = "*Id"
 		}
+		if rtgt == "BOOL" {
+			ret.WriteString("return (")
+			rtgt = "bool"
+		} else {
 			ret.WriteString("return (" + rtgt + ")(")
+		}
 		if rtype.IsPointer() {
 			ret.WriteString("unsafe.Pointer(")
 		}
@@ -382,6 +387,9 @@ func GoToC(name string, pnames []string, rtype *Type, ptypes []*Type) string {
 			ret.WriteString(")")
 		}
 	}
+	if rt == "BOOL" {
+		ret.WriteString(" != 0")
+	}
 	return ret.String()
 }
 

wrap/main.go

@@ -610,6 +610,9 @@ func (w *Wrapper) _processMethod(m *Method,fun bool) {
 	if types.IsGoInterface(grtype) {
 		grtype = "*Id"
 	}
+	if grtype == "BOOL" { // convert objective-c bools to Go bools
+		grtype = "bool"
+	}
 	if gname == grtype { // avoid name conflicts between methods and types
 		gname = "Get" + gname
 	}