scripting: add mp.input.select()

[guidocella]

This allows scripts to make the user choose from a list of entries by typing part of their text and/or by navigating them with keybindings, like dmenu or fzf.

Closes #13964.

This is simple by reusing console.lua's code and even works in the terminal. I'm not sure if we should go with this or implement a more graphical menu. Example usage:

local input = require 'mp.input'
local default_item = 1

mp.add_key_binding('F1', function ()
    local playlist = {}
    for i, entry in ipairs(mp.get_property_native('playlist')) do
        local _, filename = require 'mp.utils'.split_path(entry.filename)
        playlist[i] = filename

        if entry.playing then
            default_item = i
        end
    end

    input.select({
        items = playlist,
        default_item = default_item,
        submit = function (id)
            mp.commandv('playlist-play-index', id - 1)
            input.terminate()
        end,
    })
end)

[na-na-hi]

I personally expect 500+ lines of vendored 3rd-party dependency to do more than just this one thing. For example, --audio-file-auto, --sub-auto, and --cover-art-auto can benefit from the added fuzzy match functions. Since the included files are not intended to be used as a library, some works need to be done, which means we are now responsible to maintain the added code.

[guidocella]

I'm not sure fuzzy matching would help for --sub-auto since that's based on the media filename and not on text typed the user. That repository also has a pure lua version of fzy at https://github.com/swarn/fzy-lua/blob/main/src/fzy_lua.lua whose performance is fine so that can be used instead if preferred.

[na-na-hi]

That repository also has a pure lua version of fzy at https://github.com/swarn/fzy-lua/blob/main/src/fzy_lua.lua whose performance is fine so that can be used instead if preferred.

If the performance is fine then I think it's better than the C version for this purpose. It's in a managed language and a lot less code to deal with.

[github-actions]

Download the artifacts for this pull request:

Windows

• mpv-i686-w64-mingw32
• mpv-x86_64-w64-mingw32

macOS

• mpv-macos-14-arm
• mpv-macos-13-intel
• mpv-macos-12-intel

[kasper93]

Works. Not much to say, nice addition.