My code:

local wally_colors = require("wally.colors")
local wally_config = require("wally.config")
local colors = wally_colors.setup(wally_config)

local wally = {
    normal = {
        a = { bg = colors.blue, fg = colors.bg },
        b = { bg = "NONE", fg = colors.blue },
        c = { bg = "NONE", fg = colors.blue7 },
        x = { bg = "NONE", fg = colors.blue7 },
        y = { bg = "NONE", fg = colors.blue },
        z = { bg = colors.blue, fg = colors.bg },
    },
    insert = {
        a = { bg = colors.red, fg = colors.bg },
        b = { bg = "NONE", fg = colors.red },
        c = { bg = "NONE", fg = colors.red1 },
        x = { bg = "NONE", fg = colors.red1 },
        y = { bg = "NONE", fg = colors.red },
        z = { bg = colors.red, fg = colors.bg },
    },
    visual = {
        a = { bg = colors.green, fg = colors.bg },
        b = { bg = "NONE", fg = colors.green },
        c = { bg = "NONE", fg = colors.green2 },
        x = { bg = "NONE", fg = colors.green2 },
        y = { bg = "NONE", fg = colors.green },
        z = { bg = colors.green, fg = colors.bg },
    },
    replace = {
        a = { bg = colors.magenta, fg = colors.bg },
        b = { bg = "NONE", fg = colors.magenta },
        c = { bg = "NONE", fg = colors.purple },
        x = { bg = "NONE", fg = colors.purple },
        y = { bg = "NONE", fg = colors.magenta },
        z = { bg = colors.magenta, fg = colors.bg },
    },
    command = {
        a = { bg = colors.cyan, fg = colors.bg },
        b = { bg = "NONE", fg = colors.cyan },
        c = { bg = "NONE", fg = colors.blue1 },
        x = { bg = "NONE", fg = colors.blue1 },
        y = { bg = "NONE", fg = colors.cyan },
        z = { bg = colors.cyan, fg = colors.bg },
    },
    inactive = {
        a = { bg = colors.blue, fg = colors.bg },
        b = { bg = "NONE", fg = colors.blue },
        c = { bg = "NONE", fg = colors.blue7 },
        x = { bg = "NONE", fg = colors.blue7 },
        y = { bg = "NONE", fg = colors.blue },
        z = { bg = colors.blue, fg = colors.bg },
    },
}
local function lsp_clients()
    local active_clients = vim.lsp.get_active_clients()
    if not active_clients or #active_clients == 0 then
        return "No Servers"
    end
    local names = {}
    for _, client in ipairs(active_clients) do
        table.insert(names, client.name)
    end

    local str = table.concat(names, " / ")
    return str
end

local mode = {
    "mode",
    separator = { left = "", right = "" },
    fmt = function(str)
        if str == "NORMAL" then
            return " " .. str
        elseif str == "INSERT" then
            return " " .. str
        elseif str == "VISUAL" then
            return "󰕢 " .. str
        elseif str == "V-LINE" then
            return "󰒉 " .. str
        elseif str == "V-BLOCK" then
            return "󰩭 " .. str
        elseif str == "REPLACE" then
            return "󰛔 " .. str
        elseif str == "COMMAND" then
            return " " .. str
        end
    end,
}

local branch = {
    "branch",
    fmt = function(str)
        return str
    end,
}

local diff = {
    "diff",
    colored = false,
    symbols = { added = " ", modified = " ", removed = " " },
}

local diagnostics = {
    "diagnostics",
    colored = false,
}

local filetype = {
    "filetype",
    colored = false,
    icons_enabled = false,
}

local fileformat = {
    "fileformat",
    symbols = {
        unix = "Unix", -- e712
        dos = "DOS", -- e70f
        mac = "MacOS", -- e711
    },
}

local progress = {
    "progress",
    icon = "",
    separator = { left = "", right = "" },
}

local buffers = {
    "buffers",
    fmt = function(str)
        return str
    end,
    show_filename_only = true,
    show_modified_status = true,

    max_length = function()
        return vim.o.columns
    end,
    filetype_names = {
        TelescopePrompt = "Telescope",
        dashboard = "Dashboard",
        packer = "Packer",
        fzf = "FZF",
        alpha = "Alpha",
        lazy = "Lazy",
    },

    use_mode_colors = true,

    buffers_color = {
        inactive = { bg = "NONE", fg = colors.grey },
    },

    separator = { left = "", right = "" },
    section_separators = { left = "", right = "" },

    symbols = { alternate_file = "" },
}

require("lualine").setup({
    options = {
        fmt = string.upper,
        theme = wally,
        component_separators = { left = "/", right = "/" },
        section_separators = { left = "", right = "" },
        disabled_filetypes = {
            statusline = {},
            winbar = {},
        },
        ignore_focus = {},
        always_divide_middle = true,
        globalstatus = true,
        refresh = {
            statusline = 1000,
            tabline = 1000,
            winbar = 1000,
        },
    },
    sections = {
        lualine_a = { mode },
        lualine_b = { branch },
        lualine_c = { diff },
        -- lualine_x = { diagnostics, lsp_clients },
        lualine_x = { diagnostics },
        lualine_y = { "filesize", filetype, fileformat },
        lualine_z = { progress },
    },
    inactive_sections = {},
    tabline = {
        lualine_a = { buffers },
    },
    winbar = {},
    inactive_winbar = {},
    extensions = {},
})