A command run from a pane gets acme's $winid, the serial of the pane it was run from; one from a column's or the workspace's tag gets none

PARDES_PANE names the command pane itself, so a script a click ran had
no way to address the pane it was run in, as acme's win scripts do with
$winid. The command pane now remembers that pane and its child gets
winid set to it; a header tag's command, which no pane owns, gets winid
unset. PARDES_PANE is unchanged.

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

1 files changed, 18 insertions, 0 deletions

diff --git a/test/fs.py b/test/fs.py
index 0821b117..23647b45 100644
--- a/test/fs.py
+++ b/test/fs.py
@@ -1306,6 +1306,24 @@ def test(binary, quic=False):
         # opened is deleted, as an $EDITOR must; one on a file already open
         # waits on that pane; a session that goes away ends it with 1.
         with session(binary, root, 'wait') as (client, address):
+            # A command run from a pane's tag gets acme's $winid, that pane;
+            # one from the workspace's tag, none.
+            def command_body(node, line):
+                client.write(node, line)
+                serial = int(client.read(node).split()[-1])
+                deadline = time.monotonic() + 10
+                while True:
+                    log = client.read('/log').decode()
+                    ran = log.rfind(f'\nrun {serial} ')
+                    if ran >= 0 and f'\nexit {serial} ' in log[ran:]:
+                        body = client.read(f'/pane/{serial}/body').decode().split('% echo winid')[-1]
+                        client.remove(f'/pane/{serial}')
+                        return body
+                    assert time.monotonic() < deadline, log[-400:]
+                    time.sleep(.05)
+            first_pane = min(int(row.split()[0]) for row in client.read('/index').splitlines())
+            assert f'winid={first_pane}\n' in command_body(f'/pane/{first_pane}/tagexec', b'echo winid=$winid\n')
+            assert 'winid=\n' in command_body('/tagexec', b'echo winid=$winid\n')
             # A second --detach of a name a live session holds: said, exit 1,
             # no Zig error trace.
             second_env = {k: v for k, v in os.environ.items() if not k.startswith('PARDES_')}