An Edit block cut short through exec is an err, not a msg

An exec write does not fail for what its command says, so an a/c/i text
or { group cut short by a write that ended early was only a msg, easy to
miss. Over 9P, that failure (a truncated write, not a command's) is now
logged as an err record naming exec; the pane still says it.

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

1 files changed, 15 insertions, 1 deletions

diff --git a/src/builtins.zig b/src/builtins.zig
index dfd1e84c..6ca216e3 100644
--- a/src/builtins.zig
+++ b/src/builtins.zig
@@ -946,7 +946,21 @@ pub const Edit = struct {
         var why: sam.Why = .{};
         var said: [260]u8 = undefined;
         const res = sam.run(arena, f.content, ninep_pane.dotOf(c.pane), f.path, c.arg orelse "", &why) catch |err| switch (err) {
-            error.Edit => return c.p.reportFailure(c.id, std.fmt.bufPrint(&said, "Edit: {s}", .{why.text()}) catch "Edit: failed"),
+            error.Edit => {
+                const text = std.fmt.bufPrint(&said, "Edit: {s}", .{why.text()}) catch "Edit: failed";
+                // A block cut short (no `.` line, no `}`) that came over
+                // 9P through an exec, whose write does not fail for what
+                // a command says, is still the write's fault: an err.
+                const cut = std.mem.eql(u8, why.text(), "unmatched `{'") or std.mem.startsWith(u8, why.text(), "a, c or i text not ended");
+                if (cut and c.p.fs.serving and !c.p.fs.no_prompt) {
+                    var rec: [300]u8 = undefined;
+                    pardes.ctlfs.events.notePath(c.p, "err", std.fmt.bufPrint(&rec, "{d} exec: {s}", .{ c.pane.serial, text }) catch "- exec: Edit failed");
+                    c.p.fs.unlogged = true;
+                    defer c.p.fs.unlogged = false;
+                    return c.p.reportFailure(c.id, text);
+                }
+                return c.p.reportFailure(c.id, text);
+            },
             error.OutOfMemory => return c.p.reportError(c.id, "Edit", err),
         };
         if (res.undo != 0) {