Fixes completion of files with spaces and adds file type identifier

[JanValiska]

Related issue: #55

[haorenW1025]

I've found a weird issue though, sometimes the return type will be m and it will cause error. I can reproduce this using path completion and type /usr/bin/.

[haorenW1025]

Maybe use a metatable to prevent from getting nil value? Something like this

local fileTypesMap = setmetatable({
    ['f'] = "(file)",
    ['d'] = "(dir)",
    ['c'] = "(char)",
    ['l'] = "(link)",
    ['b'] = "(block)",
    ['p'] = "(pipe)",
    ['s'] = "(socket)"
}, {__index = function() 
    return ''
  end
})

[JanValiska]

Using suggested metatable solved the issue but even that i will get two empty words in complete_items list. I will look at it later.

[haorenW1025]

I did notice there is some weird stuff in completion list in that case, and when I'm using find /usr/bin/ -mindepth 1 -maxdepth 1 -printf '%y' in the terminal all things are l or f..., pretty weird.
Or an alternative is simply skipping the weird stuff out, they should be meaningless anyway.

  for _, val in ipairs(M.items) do
    if fileTypesMap[val.t] then goto continue end
    local score = score_func(prefix, val.name)
    if score < #prefix/3 or #prefix == 0 then
      table.insert(complete_items, {
        word = val.name,
        kind = 'Path ' .. fileTypesMap[val.t],
        score = score,
        icase = 1,
        dup = 1,
        empty = 1,
      })
    end
    ::continue::
  end

[JanValiska]

I rewrote directory listing using uv fs_scandir function. It is working better now. And it should also work on another platforms(win?). But there is still little problem with completion of items with spaces.

Try create this directory structure mkdir -p "dir_one/dir two/" and touch "dir_one/dir two/file", then start completing dir_one/ and try to reach file. It still doesn't work.

[haorenW1025]

Hmm I make some test and I think the cause is this line

  local textMatch = vim.fn.match(line_to_cursor, '\\f*$')

I use the vim built-in matching function to match the file name structure, but it can't recognize file name with spaces. Maybe we have to rewrite this.

[haorenW1025]

I think I'll merged this first since using fs_scandir is definitely a better choice. After that I'll rewrite bunch of stuff(since the code was not clear at all) to get this working with white spaces in path name. Will notify you when I finish in the issues. Thanks a lot for the contribute still:)