With BSD man, "PAGER=vim man man | cat" hangs because
[man](https://cgit.freebsd.org/src/tree/usr.bin/man/man.sh) wrongly
calls the pager even though stdout is not a terminal.
This hang manifests in places where we call apropos in a subshell,
such as in "complete -Ccar".
Let's work around this I guess. This should really be fixed upstream
because it's a problem in every app that wants to display man pages
but doesn't emulate a complete terminal.
Weirdly, the Apple derivative of man.sh uses WHATISPAGER instead
of MANPAGER.
Closes#10820
When `manpath` prints a symlink to a directory, `/usr/libexec/makewhatis`
ignores the entire directory:
```
$ /usr/libexec/makewhatis -o /tmp/whatis \
(/usr/bin/manpath | string split :)
makewhatis: /Users/wiggles/.nix-profile/share/man: Not a directory
```
This means that the built-in `man` completions will not index any commands in
these directories.
If we pass the directories to `readlink -f` first, `makewhatis` correctly
indexes the `man` pages.
```
$ /usr/libexec/makewhatis -o /tmp/whatis \
(/usr/bin/manpath | string split : | xargs readlink -f)
```
The 'str' variable was apparently mistakenly removed by 49c5f96470.
Re-add it, and regex-escape it as well.
Allow completing on apropos <TAB> instaed of requiring an initial char.
Use __fish_apropos instead of apropos.
New regex to hopefully work on more platforms.
Explicitly use ^ instead of adding it at __fish_apropos
This can be used to print the modification time, like `stat` with some
options.
The reason is that `stat` has caused us a number of portability
headaches:
1. It's not available everywhere by default
2. The versions are quite different
For instance, with GNU stat it's `stat -c '%Y'`, with macOS it's `stat
-f %m`.
So now checking a cache file can be done just with builtins.
* Hide whatis database building from the user
It's really an internal detail, but shows up in prompts that display how many
background jobs are running.
By disowning it keeps running but won't show up in `jobs` or get killed if the user
exits the shell.
* Update __fish_apropos.fish
Because MacOS' apropos is bad and doesn't support the `--` option
separator, this apparently spews errors.
Because the argument _can't_ start with a `-` (because we add a `^`),
we can just remove it.
Fixes#7965.
Because macOS' `apropos` is just using grep, and we only need
a prefix match for __fish_describe_command, we can shave off
some ok total execution time here.
No longer uses the __fish_apropos hack on every version of macOS.
Juat Catalina+.
The whatis database generated and replaced daily is 2 megabytes on
my computer, and in ~/.cache on a home dir might wind up on a net
mount or something annoying. or, definitely it's backed up by default.
It's wiser to throw that junk in with other cache files on the system
aka DARWIN_USER_CACHE_DIR, and only use the XDG directory if
someone specifically configured that.
Mainly, this just means at least it won't automatically get backed
up by Time Machine and stuff every day, which is no big deal but
y'know...
Rearranged stuff a little to not shell out every time.
This actually *worked* in my tests which confuses me.
It really shouldn't, `apropos -foo` will complain about "-o" not being
a valid option.
It should be `apropos -- -foo`.
Now, of course there are awful apropos implementations, so let's see
if someone complains
In the new __fish_apropos, makewhatis is run explicitly to generate the
whatis database. However this can be a little slow. Run it in the
background, after the apropos call completes so as to avoid a weird
race.
This means that descriptions may not be available the first time the
user invokes it, but that's better than appearing to hang for a while.
override MANPATH used by apropos with local whatis database and update it once a day
get rid of xargs
Created __fish_apropos and fixed __fish_complete_man to use that as well
moved macos apropos comment
