sl0ppty: saving the config reloads it

The reload existed but you had to ask for it, which is the wrong shape for the
thing it is mostly used for: changing a colour and looking at the result. The
server now watches the config and re-reads it when it changes.

It watches the config's *directory* and filters by name, rather than watching
the file. Editors overwhelmingly save by writing a temporary file and renaming
it over the target, which swaps the inode out from under a watch on the file
itself — it fires once and then never again, which is worse than not watching
at all because it looks like it works. The test writes in place *and* renames
over, because only the second one would have caught that.

Reloading goes through the same call the command does, so it keeps the
fail-open behaviour: a file that does not parse leaves the running config alone
and says so in a toast. That matters more here than it did for the command,
because a file caught halfway through a save is a normal thing for a watcher to
see rather than an operator mistake — and there is a test for it, and for the
recovery once the file is valid again.

Turning it off is a command-line flag rather than a setting, because a setting
would be circular: you would have to reload the config to stop it reloading the
config. --no-reload only stops the *watching*; asking explicitly still works,
which is the distinction the flag name is trying to make.

The test is a live one because inotify lives in the server's poll loop and the
headless driver has no server. It polls for the colour it expects rather than
sleeping a guess, so the passing cases cost milliseconds; the two cases that
assert nothing happened are the only ones that wait, because proving a negative
has to.

1 files changed, 2 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index acfcf48..45b6841 100644
--- a/Makefile
+++ b/Makefile
@@ -93,6 +93,8 @@ test-live: $(BIN) ## the checks that need a real tty (slow)
 	python3 tests/live_input.py
 	@echo
 	python3 tests/test_session.py
+	@echo
+	python3 tests/live_reload.py
 
 test-all: test test-live ## everything