This fixes up the SIGIO notifier in preparation for using it on BSD. It
removes the reliance on the signal's si_code, which is not available in
BSD, and it properly handles the BSD behavior where SIGIO is delivered on
a read even if the read returns EAGAIN.
On WSL1, fcntl(F_SETOWN) will fail and this would report an error.
Suppress this error message since it is not very interesting.
The effect is to disable real-time universal variable propagation.
Introduce a new strategy for notifying other fish processes of universal
variable changes, as a planned replacement for the complex
strategy_named_pipe. The new strategy still uses a named pipe, but instead
of select() on it, it arranges for SIGIO to be delivered when data is
available. If a SIGIO has been seen since the last check, it means the file
needs to be re-read.
Profiling revealed string comparison in variable lookups to be a
significant hotspot. This change causes `make test` to complete ~4.5%
faster per `hyperfine`.
Because an exported universal variable must be exported in all variable
stacks, explicit invalidation is infeasible. Switch the universal variables
to a generation count.
This sets the explicit path to the default one, which should be okay,
since the default path never changes (not even if $XDG_CONFIG_HOME
does).
Then it saves a narrow version of that, which saves most of the time
needed to `sync` in most cases.
Fixes#5905.
This runs build_tools/style.fish, which runs clang-format on C++, fish_indent on fish and (new) black on python.
If anything is wrong with the formatting, we should fix the tools, but automated formatting is worth it.
I believe this was selected to be artificially low for the sake
of it displaying well in prompts. But people should expect to get
the same output as can be gotten from `hostname`.
Fixes#5758
C++11 provides std::min/std::max which we're using all over,
obviating the need for our own templates for this.
util.h now only provides two things: get_time and wcsfilecmp.
This commit removes everything that includes it which doesn't
use either; most because they no longer need mini or maxi from
it but some others were #including it unnecessarily.
This reverts commit 1cb8b2a87b05298b70ab285607f5863942b14f58.
argv[0] has the full path in it for a user when he executes it
out of $PATH. This is really annoying in the title which uses $_.
... rather than hard code it to "fish". This affects
what is found in $_ and improves the errors:
For example, if fish was ran with ./fish, instead of
something like:
fish: Expected 3 surprises, only got 2 surprises
we'll see:
./fish: Expected 3 surprises, only got 2 surprises
like most other shell utilities. It's just a tiny bit
of detail that can avoid confusion.
This is to avoid development versions of fish 3.0 freaking out when the
file format is changed. We now have better support for for future universal
variable formats so it's unlikely we'll have to change the file name again.
