add Lang.reset, open scri_file and write current commands to it

src/lang.zig

@@ -158,6 +158,11 @@ pub const Lang = struct {
         self.keywords.deinit();
     }
 
+    pub fn reset(self: *Lang) void {
+        self.has_error = false;
+        self.line = 0;
+    }
+
     fn fillKeywords(self: *Lang) !void {
         _ = try self.keywords.put("noop", .Noop);
         _ = try self.keywords.put("load", .Load);

src/main.zig

@@ -14,6 +14,12 @@ pub fn doRepl(allocator: *std.mem.Allocator, args_it: var) !void {
 
     const scri_path = try (args_it.next(allocator) orelse @panic("expected scri path"));
 
+    var file = try std.fs.File.openWrite(scri_path);
+    defer file.close();
+
+    var out = file.outStream();
+    var stream = &out.stream;
+
     // the thing here is that 'load :0' would load the scri_path, since we
     // now have a 'repl' argument right before it. to counteract that, the
     // initial repl buffer contains 'load :1' instead.
@@ -41,7 +47,7 @@ pub fn doRepl(allocator: *std.mem.Allocator, args_it: var) !void {
 
         var buffer = try std.Buffer.init(allocator, ""[0..]);
         var line = std.io.readLine(&buffer) catch |err| {
-            if (err == error.EndOfStream) return;
+            if (err == error.EndOfStream) break;
             return err;
         };
 
@@ -51,11 +57,13 @@ pub fn doRepl(allocator: *std.mem.Allocator, args_it: var) !void {
         };
         try cmds.append(cmds_parsed.at(0));
 
+        lang.reset();
+
         // TODO save the line to scri_file? or should we have a special `push`
         // to do so?
 
-        // note this is debug
-        try printer.printList(cmds, stdout);
+        try file.seekTo(0);
+        try printer.printList(cmds, stream);
     }
 }