Views generated by each read stat 0, as acme's do: data, xdata, index, layout, recent and listeners; fs.md says which files have real lengths

A stat of index, layout, recent or listeners built the whole view to
count it, and data and xdata reported the body's length though a read
answers what addr selects. Those now stat 0, as screen and pane/new
already did, and fs.md lists the files whose length is real and says to
read the rest to the end.

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

1 files changed, 6 insertions, 17 deletions

diff --git a/src/ninep/tree.zig b/src/ninep/tree.zig
index c0ace5be..a7f3f2a4 100644
--- a/src/ninep/tree.zig
+++ b/src/ninep/tree.zig
@@ -253,13 +253,6 @@ pub const TopFile = enum(u5) {
 
 pub const root: u64 = @intFromEnum(TopFile.root);
 
-fn recentLen(p: *Pardes) u64 {
-    var buf: [64]u8 = undefined;
-    var counting: std.Io.Writer.Discarding = .init(&buf);
-    pardes.panes.Output.recentText(p, &counting.writer, false) catch return 0;
-    return counting.fullCount();
-}
-
 /// Declaration order is readdir order.
 pub const PaneFile = enum(u5) {
     dir = 0,
@@ -643,23 +636,19 @@ fn attrOf(p: *Pardes, target: Target) ?Reply.Attr {
 
 fn topSize(p: *Pardes, f: TopFile) u64 {
     return switch (f) {
-        // ponytail: /screen has no length until an open renders its frame,
-        // and /pane/new none until an open has a pane to name.
-        .root, .pane, .col, .screen, .new => 0,
-        .layout => cols.layoutLen(p),
+        // Views generated whole by each read have no length, as acme's
+        // generated files have none: /screen until an open renders its
+        // frame, /pane/new until an open has a pane to name, and the index,
+        // layout, recent list and listeners, which a stat would otherwise
+        // have to build to count.
+        .root, .pane, .col, .screen, .new, .layout, .index, .recent, .listeners => 0,
         .tag => cols.headerText(p, null).?.len,
-        .index => pane.indexLen(p),
         .README => fs.help.len,
         .status => ctl.statusLen(p),
         .look, .exec, .tagexec => ctl.resultsLen(p),
         .log => events.logLen(&p.fs.log),
-        .listeners => listeners: {
-            var buf: [screen.listeners_cap]u8 = undefined;
-            break :listeners screen.listenersText(p, &buf).len;
-        },
         .ctl => ctl.rootLen(p),
         .commands => ctl.commandsLen(),
-        .recent => recentLen(p),
         .focus => focus: {
             if (p.header_focus) break :focus 0;
             const pn = p.panes[p.active] orelse break :focus 0;