local shfmt = function()
  local indent = 0 -- Assume tabs initially.
  if vim.o.expandtab then
    local shiftwidth = vim.opt.shiftwidth:get()
    if shiftwidth == 0 then
      indent = vim.o.tabstop
    else
      indent = shiftwidth
    end
  end

  return {
    exe = "shfmt",
    -- stylua: ignore start
    args = {
      "--indent", indent,   -- 0 for tabs, >0 for number of spaces.
      "--keep-padding",     -- Keep column alignment paddings.
    },
    -- stylua: ignore end
    stdin = true,
  }
end

return {
  "mhartington/formatter.nvim",

  cmd = {
    "Format",
    "FormatLock",
    "FormatWrite",
    "FormatWriteLock",
  },

  keys = function()
    local icon = require("util.icons").ui.Format
    return {
      {
        "<leader>F",
        require("util.autoformat").toggle,
        desc = icon .. " Toggle auto [F]ormat on write",
      },
      {
        "<leader>=",
        "<cmd>Format<cr>",
        desc = icon .. " format file",
      },
      {
        "<c-f>",
        "<cmd>Format<cr>",
        mode = "i",
        desc = icon .. " [f]ormat file",
      },
    }
  end,

  opts = function()
    local builtin = require("formatter.filetypes")
    return {
      filetype = {
        -- stylua: ignore start
        c        = { builtin.c.clangformat },
        cmake    = { builtin.cmake.cmakeformat },
        cpp      = { builtin.cpp.clangformat },
        cs       = { builtin.cs.clangformat },
        json     = { builtin.cs.prettier },
        lua      = { builtin.lua.stylua },
        markdown = { builtin.markdown.prettier },
        python   = {}, -- TODO: pick one
        sh       = { shfmt() },
        zsh      = { builtin.zsh.beautysh },
        -- stylua: ignore end
      },
    }
  end,
}