absolute-vim/lua/absolute/after/incline.lua

local incline = require("incline")
local helpers = require("incline.helpers")
local devicons = require("nvim-web-devicons")

incline.setup({
    window = {
        padding = 0,
        margin = { horizontal = 0 },
    },
    render = function(props)
        local filename = vim.fn.fnamemodify(vim.api.nvim_buf_get_name(props.buf), ":t")
        local ft_icon, ft_color = devicons.get_icon_color(filename)
        local modified = vim.bo[props.buf].modified

        local function get_git_diff()
            local icons = { removed = "", changed = "", added = "" }
            local signs = vim.b[props.buf].gitsigns_status_dict
            local labels = {}
            if signs == nil then
                return labels
            end
            for name, icon in pairs(icons) do
                if tonumber(signs[name]) and signs[name] > 0 then
                    table.insert(labels, { icon .. signs[name] .. " ", group = "Diff" .. name })
                end
            end
            if #labels > 0 then
                table.insert(labels, { "┊ " })
            end
            return labels
        end

        local function get_diagnostic_label()
            local icons = { error = "", warn = "", info = "", hint = "" }
            local label = {}

            for severity, icon in pairs(icons) do
                local n = #vim.diagnostic.get(props.buf, { severity = vim.diagnostic.severity[string.upper(severity)] })
                if n > 0 then
                    table.insert(label, { icon .. n .. " ", group = "DiagnosticSign" .. severity })
                end
            end
            if #label > 0 then
                table.insert(label, { "┊ " })
            end
            return label
        end

        return {
            { get_diagnostic_label() },
            { get_git_diff() },
            ft_icon and { ' ', ft_icon, ' ', guibg = ft_color, guifg = helpers.contrast_color(ft_color) } or '',
            ' ',
            { filename, gui = modified and 'bold,italic' or 'bold' },
            ' ',
            guibg = '#44406e',
        }
    end,
})