When trying to use completion for mpv binaries specified with some shell
glob, e.g. ~/dev/mpv/build/mpv, the current code doesn't substitute the
homedir prefix into the path name, resulting in runtime errors about
the file '~/dev/mpv/build/mpv' not being found.
The simple fixed is to use $~var instead of $var whenever expanding the
filename, which performs the same globbing that would otherwise be
performed when executing the command.
The generate_xxx() helpers, once defined, would appear as
user-visible functions; this would lead to unexpected and
confusing completion suggestions for gene<tab> after having
once run mpv in that shell.
This PR adds the prefix '_mpv_' to all completion functions
as a convention to make them less user-visible and less likely
to collide with other packages.
\s and \S aren't actually part of the spec, but it seems glibc supports
them anyway so I didn't notice when originally testing. This fixes the
script on Apple's libc and probably others that adhere more closely to
the spec.
The most direct replacement for \s would have been [[:space:]], but we
only expect to see spaces and tabs, so might as well just do that. Also
could have used [[:blank:]], which is basically a locale-aware version
of [ \t], but mpv isn't going to output anything but ASCII spaces and
tabs, so let's avoid unnecessary complexity and stick with the ASCII
literals.
It was supposed to be optional already, but I misunderstood how the
re_match_pcre option worked. If it's set, it will try to use PCRE
matching whether it's available or not (and blow up if it's not). So,
first try to load the module it'll use, and only set the option if that
works.
Fixes#7240.
The completion function itself now parses --list-options on the first
tab press and caches the results. This does mean a slight delay on that
first tab press, but it will only do this if the argument being
completed looks like an option (i.e. starts with "-"), so there is never
a delay when just completing a file name. I've also put some effort into
making it reasonably fast; on my machine it's consistently under 100 ms,
more than half of which is mpv itself.
Installation of zsh completion is now done unconditionally because it's
nothing more than copying a file. If you really don't want it installed,
set zshdir to empty: `./waf configure --zshdir= ...`
Improvements in functionality compared to the old script:
* Produces the right results for mpv binaries other than the one it was
installed with (like a dev build for testing changes).
* Does not require running mpv at build time, so it won't cause
problems with cross compilation.
* Handles aliases.
* Slightly nicer handling of options that take comma-separated values
and/or sub-options: A space is now inserted at the end instead of a
comma, allowing you to immediately start typing the next argument,
but typing a comma will still remove the automatically added space,
and = and : will now do that too, so you can immediately add a
sub-option.
* More general/flexible handling of values for options that print their
possible values with --option=help. The code as is could handle quite
a few more options (*scale, demuxers, decoders, ...), but nobody
wants to maintain that list here so we'll just stick with what the
old completion script already did.
