From 682e237df7e8b22f820d14a4adee58e6e2f84268 Mon Sep 17 00:00:00 2001
From: Gabriel Schneider <gbrls@0x4200.cafe>
Date: Fri, 11 Sep 2026 12:38:56 -0300
Subject: trunk: resume before the Reload experiment

Empty marker on the last pre-Reload change. Keep the Reload experiment on reload (3801914), its first change on reload-start (200a1fc), and the unfinished performance investigation on reload-perf-wip.
---
 src/fs.zig | 51 +++++++++++++++++++++++++++++++++------------------
 1 file changed, 33 insertions(+), 18 deletions(-)

(limited to 'src/fs.zig')

diff --git a/src/fs.zig b/src/fs.zig
index 50b56f76..63d2ed3a 100644
--- a/src/fs.zig
+++ b/src/fs.zig
@@ -2911,6 +2911,36 @@ fn writeCtl(p: *Pardes, req: Req, serial: u32) Reply {
     return .{ .tag = req.tag, .written = @intCast(req.data.len) };
 }
 
+/// Change a buffer's absolute name without writing or renaming a disk file.
+/// Tag editing preserves user commands; the 9P name operation resets its tail.
+pub fn nameBuffer(p: *Pardes, id: usize, full: []const u8, preserve_tag: bool) !void {
+    const pane = p.panes[id] orelse return error.NoPane;
+    const f = fileOf(pane) orelse return error.NotFile;
+    if (!std.fs.path.isAbsolute(full) or full.len == 0 or full.len >= 4096)
+        return error.InvalidName;
+    for (full) |c| if (c < ' ') return error.InvalidName;
+    if (std.mem.eql(u8, f.path, full)) return;
+    const copy = try p.gpa.dupe(u8, full);
+    p.gpa.free(f.path);
+    f.path = copy;
+    if (panes.Output.fileTraits(f.output).saves) {
+        f.output = null;
+        pane.clearCwd();
+        if (!preserve_tag) {
+            pane.tag_init = false;
+            pane.tag_tail_len = 0;
+        }
+        f.saved_revision = f.revision -% 1;
+        f.watch_after_save = localPath(full) != null;
+    }
+    if (f.highlights.len > 0) p.tree_sitter_gpa.free(f.highlights);
+    f.highlights = &.{};
+    f.highlight_start = 0;
+    f.syntax_dirty = true;
+    p.invalidateLookHover(id);
+    p.emit(.{ .watch = .{ .pane = @intCast(id), .on = false } });
+}
+
 fn ctlVerb(p: *Pardes, id: usize, line: []const u8, apply: bool, dirty: *bool) u16 {
     const pane = p.panes[id] orelse return E.INVAL;
     const pf = &p.fs.panes[id];
@@ -2935,23 +2965,7 @@ fn ctlVerb(p: *Pardes, id: usize, line: []const u8, apply: bool, dirty: *bool) u
         if (std.mem.eql(u8, f.path, full)) return 0;
         if (panes.Output.fileTraits(f.output).saves) dirty.* = true;
         if (!apply) return 0;
-        const copy = p.gpa.dupe(u8, full) catch return E.NOMEM;
-        p.gpa.free(f.path);
-        f.path = copy;
-        if (panes.Output.fileTraits(f.output).saves) {
-            f.output = null;
-            pane.clearCwd();
-            pane.tag_init = false;
-            pane.tag_tail_len = 0;
-            f.saved_revision = f.revision -% 1;
-            f.watch_after_save = localPath(full) != null;
-        }
-        if (f.highlights.len > 0) p.tree_sitter_gpa.free(f.highlights);
-        f.highlights = &.{};
-        f.highlight_start = 0;
-        f.syntax_dirty = true;
-        p.invalidateLookHover(id);
-        p.emit(.{ .watch = .{ .pane = @intCast(id), .on = false } });
+        nameBuffer(p, id, full, false) catch return E.NOMEM;
         return 0;
     }
     for (refused_verbs) |w| if (verbIs(line, w)) return E.INVAL;
@@ -3711,7 +3725,8 @@ test "index prints winctlprint's five fields then the tag" {
     @memcpy(got[0..a.bytes.len], a.bytes);
     const line = got[0..a.bytes.len];
 
-    const tag = tagOf(p, pane);
+    const tag = try gpa.dupe(u8, tagOf(p, pane));
+    defer gpa.free(tag);
     var want: std.ArrayList(u8) = .empty;
     defer want.deinit(gpa);
     try want.print(gpa, "{d:>11} {d:>11} {d:>11} {d:>11} {d:>11} {s}\n", .{
-- 
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