Customize a Neovim bufferline

The popular buffer line plugin nowadays is akinsho/bufferline, but I feel that it is too heavy and not visually appealing. For example, it can integrate with LSP and switch between various tab/buffer modes, but not everyone needs that. Also, the order is fixed. In short, I want to reinvent the wheel: fzdwx/bufline.nvim

To define a tabline in nvim, you can use vim.opt.tabline=xxx. For example, the following code easily implements a buffer line:

function _G.qweqweqwe()
	return "this is my line"
end

-- config
vim.opt.tabline = "%!v:lua.qweqweqwe()"

Then it is easy to think of the following:

Get all buffers
Get information about the corresponding files of the buffers
- For example, the file name
- Display file icon (supported by nvim-tree/nvim-web-devicons)
Support highlighting

I won't go into detail on how to implement it, but if you are interested, you can check out: fzdwx/bufline.nvim. Currently, all content can be customized:

M.folder  -- The input is the number of buffers, and it should return Group: {hl,str}
M.dirName -- The input is the current buffer id, and it should return Group
M.devicon -- The input is the current buffer id, "Sel/NoSel" (whether it is selected), and it should return Group
M.title   -- The input is the current buffer id, "Sel/NoSel" (whether it is selected), and it should return Group
M.modified  -- The input is the current buffer id, and it should return str
M.separator -- It should return Group

-- The following two methods can also be customized, and the user needs to ensure their correctness
M.cell  -- Information for each buffer, the input is the current buffer id and the currently selected buffer id, and it should return a list of groups
M.bufline -- Construct the entire bufline

str is the specific content, and hl is the tag for highlighting. For example, BufLineFolder currently supports:

BufLineTitleSel  
BufLineTitleNoSel  
BufLineFill  
BufLine  
BufLineFolder

These highlighting tags do not have default settings and need to be customized by the user. For example:

vim.cmd([[au ColorScheme * hi BufLineTitleSel gui=none guibg='#282C34' guifg='#5C6370']])

When setting the highlighting, there was a problem where icons with a background color and icons without one would have different sizes. In the end, I had no choice but to make them all have colors, just like the bufferline.

Using in lazy:

{  
    "fzdwx/bufline.nvim",  
    event = "BufEnter",  
    dependencies = {  
        "nvim-tree/nvim-web-devicons",  
    },  
    config = function()  
        local buf = require("bufline")  
        buf.setup({  
            -- Custom separator
            separator = function()  
                return {  
                    str = '',  
                    hl = ""  
                }  
            end  
        })  
    end,  
},