Edit's w to a file changed on disk since read is refused once, as Save is (w again to overwrite), the rest of an X/'/w written and the refused named; Edit filters get a pane command's environment ($PARDES_MOUNT, $PARDES_9P, $PARDES_PID, $winid); an Edit with no commands runs beside one whose commands run unless it touches a file that one changes, refused busy (EBUSY) as is a second Edit with commands

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

1 files changed, 14 insertions, 0 deletions

diff --git a/src/host_io.zig b/src/host_io.zig
index ee503061..7314affc 100644
--- a/src/host_io.zig
+++ b/src/host_io.zig
@@ -1469,6 +1469,20 @@ test "the child environment replaces the launcher's terminal identity exactly on
 
 extern "c" fn unsetenv(name: [*:0]const u8) c_int;
 
+/// The environment a pane's command is given (exportPaneEnv, `$winid`,
+/// ChildEnv), as `NAME=value` lines in `arena`, for a command that is not a
+/// pane's: an Edit's filters, run from pane `serial`.
+pub fn commandEnv(arena: std.mem.Allocator, serial: u32, adopts: bool) ![]const []const u8 {
+    ninep_io.exportSessionEnv(serial, adopts);
+    exportWinid(serial);
+    var slots: ChildEnv.Slots = undefined;
+    const envp = ChildEnv.build(&slots, .command) orelse return error.EnvironmentTooLarge;
+    var out: std.ArrayList([]const u8) = .empty;
+    var i: usize = 0;
+    while (envp[i]) |entry| : (i += 1) try out.append(arena, try arena.dupe(u8, std.mem.span(entry)));
+    return out.items;
+}
+
 fn exportWinid(serial: u32) void {
     var buf: [16]u8 = undefined;
     if (serial != 0) if (std.fmt.bufPrintSentinel(&buf, "{d}", .{serial}, 0)) |text| {