By not manipulating each line or even each file at a time, we can go
back to `string` and piece together a pipeline that will execute
significantly faster than shelling out to `awk` will. This also removes
one of the few dependencies on `awk` in the codebase.
With this change, `__fish_print_hostnames` now finishes ~80% faster than
it used to a few commits back.
Reordering the `getent hosts` and read from `/etc/hosts` combined with
minimizing shelling and job invocations for parsing the output results
in a profiled and benchmarked ~42% decrease in the time it takes to run,
and that's on a machine with a very small hosts list in the first place.
This update also fixes the hadling of IPv6 addresses in the hosts
output, which were previously ignored, and ignores 127.* loopback
addresses in addition to the 0.0.0.0 address (plus adds support for
shorter IPv4 notations).
See for example: https://git-scm.com/docs/git-cherry
git cherry is quite helpful when trying to findout if merges between
branches are complete, when there were cherry-picks in addition to
merges.
Previously, elements already existing in the path variable would keep their position when the path was being constructed from the config files. This caused issues given that $PATH typically already contains "/usr/bin:/bin" when fish initializes within a macOS terminal app. In this case, these would keep their position at the front of the $PATH, even though the system path_helper configs explicitly place them _after_ other paths, like "/usr/local/bin". This would render binaries in "/usr/local/bin" as effectively "invisible" if they also happen to live in "/usr/bin" as well. This is not the intended
This change makes the __fish_macos_set_env config function emulate the macOS standard path_helper behavior more faithfully, with:
1. The path list being constructed *from scratch* based on the paths specified in the config files
2. Any distinct entries in the exist path environment variable being appended to this list
3. And then this list being used to *replace* the existing path environment variable
The result, for a vanilla fish shell on macOS, is that the $PATH is now set to:
/usr/local/bin /usr/local/sbin /usr/bin /bin /usr/sbin /sbin
Where previously it was set to:
/usr/bin /bin /usr/local/bin /usr/sbin /sbin
This new $PATH exactly matches the order of paths specified in `/etc/paths`.
$__fish_git_prompt_use_informative_chars will use the informative
chars without requiring informative mode (which is really frickin'
slow!).
See #5726.
[ci skip]
This previously effectively checked `string split ' '`s return status,
which was false if it didn't split anything. And while that should be
true if getent fails (because it should produce no output), it's also
true if it doesn't print a line with multiple aliases. Which should be
fairly typical.
Instead we use our new-found $pipestatus to check what getent returns,
in the assumption that it'll fail if it doesn't support hosts.
Follow up to 8f7a47547e.
[ci skip]
`getent hosts` is expensive-ish - ~50ms, so we don't want to run it
twice just to figure out it works.
Apparently this works everywhere but CYGWIN and possibly older
OpenBSD, but we don't want to explicitly blacklist those.
[ci skip]
