Errors are said in words, and a refusal names what it takes

A failure read `Del k|j: InvalidArgument`, `Kill: NoSuchCommand`, `ill-formed control message`, or nothing at all. reportError now spells an error's name as words, and the refusals name their accepted forms: pty/ctl lists its verbs, a flag file takes 1 or 0, a setting word takes on or off, Del takes k, j or nothing, Repl takes - or a language. Kill with nothing to stop says so, /focus says pane, a Look that found nothing says no match, and pty/run on a command pane says it is not a shell. A ctl write's failure has room for the Repl list and is cut between words, the Repl word at a character.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/exec.zig b/src/exec.zig
index 12934c3c..584d1b96 100644
--- a/src/exec.zig
+++ b/src/exec.zig
@@ -740,7 +740,11 @@ pub fn applySettingBuiltin(p: *Pardes, setting: config.Runtime.Setting, arg: ?[]
             if (!p.settings.requestFont(matches[0].path, matches[0].name, spec.size_hundredths)) return;
             p.font_request_taken = false;
         },
-        else => _ = p.settings.apply(setting, arg),
+        else => if (!p.settings.apply(setting, arg) and p.announce) {
+            var text: [96]u8 = undefined;
+            const takes = if (setting.action == .toggle) "takes on or off" else "does not take that value";
+            p.reportFailure(p.active, std.fmt.bufPrint(&text, "{s}: {s}", .{ setting.word, takes }) catch takes);
+        },
     }
     if (p.settings.colors != previous_colors) {
         for (p.panes) |slot| {