Recent keeps only files on disk, and its cap never drops an open one

A renamed scratch never saved and a /virtual/ pane were recorded as recent files, and at 200 the oldest entry went even when that file was open. Opens, renames and closes now record a path only when it is a file on this host, and the cap drops the oldest closed entry. A name with a newline is not written to the kept list, where it would read back as two.

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

1 files changed, 10 insertions, 0 deletions

diff --git a/src/exec.zig b/src/exec.zig
index 0e9fb6d7..fdb9bdb7 100644
--- a/src/exec.zig
+++ b/src/exec.zig
@@ -395,6 +395,16 @@ pub fn isDirectory(path: []const u8) bool {
     return stat.kind == .directory;
 }
 
+/// Whether `path` is a plain file on this host, the turn out while it asks.
+pub fn isFile(path: []const u8) bool {
+    var buf: [4096]u8 = undefined;
+    const z = std.fmt.bufPrintSentinel(&buf, "{s}", .{path}, 0) catch return false;
+    pardes.turn.yield();
+    defer pardes.turn.back();
+    const stat = std.Io.Dir.cwd().statFile(std.Io.Threaded.global_single_threaded.io(), z, .{}) catch return false;
+    return stat.kind == .file;
+}
+
 /// With `BootShell replace`, a doc landing in `col` closes a lone pristine
 /// shell there, the boot's placeholder, and absorbVWeight hands its space to
 /// the doc. With `keep`, the default, the shell stays like any other pane.