A +Pager keeps its program's colours: the session parses what /pager is written after its directory with ghostty-vt, SGR becomes spans drawn over the plain text, every other escape is dropped, and PagerColor off pages it plain

1 files changed, 14 insertions, 0 deletions

diff --git a/test/selfmount.py b/test/selfmount.py
index ddfb77dc..57dfffa8 100644
--- a/test/selfmount.py
+++ b/test/selfmount.py
@@ -182,6 +182,20 @@ def run(binary):
             log = client.read('/log').decode()
             check(log.count('over 1 MiB') == 1 and 'unknown control message' not in log and 'after-long' in log,
                   'a 1.1 MiB line is refused once, its tail never a line, the next line runs')
+            # `pardes -` by hand through the mount: the directory, then a
+            # program's output, escapes and all, on one open of /pager; the
+            # +Pager reads back the plain text.
+            got = run(f"{{ pwd; printf '\\033[31mred\\033[m\\n'; }} > {mount}/pager\n".encode())
+            rows = [row.rsplit(maxsplit=1)[0].split(maxsplit=3) for row in client.read('/index').decode().splitlines()]
+            paged = [row[0] for row in rows if len(row) == 4 and row[3].endswith('/+Pager')]
+            check(got == '0' and len(paged) == 1, f'a +Pager made through the mount ({got!r}, {paged!r})')
+            if paged:
+                # The text goes in at the open's close, and a mount's close
+                # (FUSE's release) comes after close(2) has returned.
+                deadline = time.monotonic() + 5
+                while (said := client.read(f'/pane/{paged[0]}/body')) != b'red\n' and time.monotonic() < deadline:
+                    time.sleep(.05)
+                check(said == b'red\n', f'its body is the plain text ({said!r})')
             # Forty event reads held through the mount, a follower each, and
             # the mount still answers the rest: 9ns keeps workers past what
             # the editor holds (128), so `cat layout` is not queued behind