add anything?, minor refactors

src/builtins.zig

@@ -102,6 +102,7 @@ pub fn defineAll(machine: *DtMachine) !void {
     try machine.define("rev", "reverse a quote or string", .{ .builtin = rev });
     try machine.define("quote", "quote a value", .{ .builtin = quoteVal });
     try machine.define("quote-all", "quote all current context", .{ .builtin = quoteAll });
+    try machine.define("anything?", "true if any value at all precedes", .{ .builtin = @"anything?" });
     try machine.define("concat", "concatenate two quotes. Values are coerced into quotes. (For String concatenation, see join)", .{ .builtin = concat });
     try machine.define("push", "move an item into a quote", .{ .builtin = push });
     try machine.define("pop", "move the last item of a quote to top of stack", .{ .builtin = pop });
@@ -436,7 +437,10 @@ pub fn norm(dt: *DtMachine) !void {
 pub fn dotS(dt: *DtMachine) !void {
     try stdout.print("[ ", .{});
 
-    var top = dt.nest.first orelse return;
+    var top = dt.nest.first orelse {
+        try stdout.print("]", .{});
+        return;
+    };
 
     for (top.data.items) |val| {
         try val.print(dt.alloc);
@@ -1210,6 +1214,11 @@ pub fn quoteAll(dt: *DtMachine) !void {
     try dt.quoteContext();
 }
 
+pub fn @"anything?"(dt: *DtMachine) !void {
+    const top = dt.nest.first orelse return Error.ContextStackUnderflow;
+    try dt.push(.{ .bool = top.data.items.len != 0 });
+}
+
 pub fn concat(dt: *DtMachine) !void {
     const vals = try dt.popN(2);
 

src/main.zig

@@ -58,6 +58,7 @@ fn handlePipedStdoutOnly(dt: *DtMachine) !void {
 fn readEvalPrintLoop(dt: *DtMachine) !void {
     dt.handleCmd("run-args") catch |e| return doneOrDie(dt, e);
 
+    // TODO: Can this catch be done in the stdlib? Other people need to catch errors too!
     while (true) dt.handleCmd("main-repl") catch |e| switch (e) {
         error.EndOfStream => {
             try stderr.print("\n", .{});

src/stdlib.dt

@@ -11,12 +11,12 @@
 [ p nl ] \pl def
 [ p ] \print def
 [ pl ] \println def
-[ \pl map drop ] \pls def
+[ \pl each ] \pls def
 
 [ ep enl ] \epl def
 [ ep ] \eprint def
 [ epl ] \eprintln def
-[ \epl map drop ] \epls def
+[ \epl each ] \epls def
 
 [ .s ] \status def