term: get_terminal_size() for js_node, term.clear() for all js backen…

…ds (#12189)

vlib/term/term.js.v

@@ -1,8 +1,23 @@
 module term
 
+#const $tty = require('tty');
 // get_terminal_size returns a number of colums and rows of terminal window.
 pub fn get_terminal_size() (int, int) {
-	// TODO Find a way to get proper width & height of the terminal
-	// on a Javascript environment
-	return default_columns_size, default_rows_size
+	$if js_node {
+		colums := 0
+		rows := 0
+		#let sizes = $tty.WriteStream(1).getWindowSize();
+		#colums.val = sizes[0];
+		#rows.val = sizes[1];
+
+		return colums, rows
+	} $else {
+		return default_columns_size, default_rows_size
+	}
+}
+
+// clear clears current terminal screen.
+pub fn clear() {
+	print('\x1b[2J')
+	print('\x1b[H')
 }

vlib/v/gen/js/auto_str_methods.v

@@ -264,24 +264,24 @@ fn (mut g JsGen) gen_str_for_multi_return(info ast.MultiReturn, styp string, str
 		arg_str_fn_name := g.get_str_fn(typ)
 
 		if should_use_indent_func(sym.kind) && !sym_has_str_method {
-			fn_builder.writeln('\tstrings__Builder_write_string(sb, ${arg_str_fn_name}(a.arg$i));')
+			fn_builder.writeln('\tstrings__Builder_write_string(sb, ${arg_str_fn_name}(a[$i]));')
 		} else if sym.kind in [.f32, .f64] {
 			if sym.kind == .f32 {
-				tmp_val := str_intp_g32('a.arg$i')
+				tmp_val := str_intp_g32('a[$i]')
 				fn_builder.writeln('\tstrings__Builder_write_string(sb, $tmp_val);')
 			} else {
-				tmp_val := str_intp_g64('a.arg$i')
+				tmp_val := str_intp_g64('a[$i]')
 				fn_builder.writeln('\tstrings__Builder_write_string(sb, $tmp_val);')
 			}
 		} else if sym.kind == .string {
-			tmp_str := str_intp_sq('a.arg$i')
+			tmp_str := str_intp_sq('a[$i]')
 			fn_builder.writeln('\tstrings__Builder_write_string(sb, $tmp_str);')
 		} else if sym.kind == .function {
 			fn_builder.writeln('\tstrings__Builder_write_string(sb, ${arg_str_fn_name}());')
 		} else {
 			deref, deref_label := deref_kind(str_method_expects_ptr, is_arg_ptr, typ)
 			fn_builder.writeln('\t\tstrings__Builder_write_string(sb, new string("$deref_label"));')
-			fn_builder.writeln('\tstrings__Builder_write_string(sb, ${arg_str_fn_name}( $deref a.arg$i));')
+			fn_builder.writeln('\tstrings__Builder_write_string(sb, ${arg_str_fn_name}( $deref a[$i]));')
 		}
 		if i != info.types.len - 1 {
 			fn_builder.writeln('\tstrings__Builder_write_string(sb, new string(", "));')