dotfiles/sources/nvim/lua/settings/lazy/plugins/nvimtree.lua

local function use_nvim_tree_width(options)
  if type(options) ~= "table" then
    return
  end

  ---@type number
  local offset = options.offset

  ---@type number
  local initial_width = options.initial_width

  local initial_width_type = type(initial_width)

  local on_width_updated = options.on_width_updated

  if type(on_width_updated) ~= "function" then
    on_width_updated = function() end
  end

  if type(offset) ~= "number" then
    offset = 10
  end

  if initial_width_type ~= "number" and initial_width_type ~= "table" then
    initial_width = 30
  end

  ---@type number|table
  local previous_width = initial_width

  if initial_width_type ~= "number" then
    previous_width = 30
  end

  ---@type number|table
  local width = initial_width

  local function get_width()
    return width
  end

  local function increment_width()
    if type(width) == "table" then
      width = previous_width
    end

    local new_width = width + offset

    previous_width = new_width
    width = new_width

    on_width_updated(new_width)
  end

  local function decrement_width()
    if type(width) == "table" then
      width = previous_width
    end

    local new_width = width - offset

    previous_width = new_width
    width = new_width

    on_width_updated(new_width)
  end

  local function dynamic_width()
    width = {}
    on_width_updated(width)
  end

  return get_width, increment_width, decrement_width, dynamic_width
end

return {
  "nvim-tree/nvim-tree.lua",
  dependencies = {
    "nvim-tree/nvim-web-devicons",
  },
  config = function()
    vim.g.loaded_netrw = 1
    vim.g.loaded_netrwPlugin = 1
    vim.opt.termguicolors = true

    local nvimTreeApi = require("nvim-tree.api")

    local get_width, increment_width, decrement_width, dynamic_width = use_nvim_tree_width({
      offset = 5,
      initial_width = 30,
      on_width_updated = function(width)
        vim.cmd.NvimTreeResize(width)
      end
    })

    local function on_nvim_tree_attach(buffer)
      local function opts(desc)
        return { desc = "nvim-tree: " .. desc, buffer = buffer, noremap = true, silent = true, nowait = true }
      end

      -- default mappings
      nvimTreeApi.config.mappings.default_on_attach(buffer)

      -- custom mappings
      vim.keymap.set('n', 'l', nvimTreeApi.node.open.edit, opts('Open file/directory'))
      vim.keymap.set('n', 'h', nvimTreeApi.node.navigate.parent_close, opts('Help'))
    end

    require("nvim-tree").setup({
      on_attach = on_nvim_tree_attach,
      auto_reload_on_write = true,
      sort_by = "case_sensitive",
      filters = {
        dotfiles = false,
      },
      notify = {
        -- Notifies everything from the INFO severity to ERROR
        threshold = vim.log.levels.INFO,
        -- Notifies only the relative path instead of the absolute
        absolute_path = false,
      },
      -- Move to the first letter of each folder/files instead of the beginning of the line
      hijack_cursor = true,
      -- Disable completely netrw, just in case
      disable_netrw = true,
      -- Reload the tree whenever a buffer is opened
      reload_on_bufenter = true,
      -- Allows using vim.ui.select for various operation instead of the defaut implementation
      select_prompts = true,
      view = {
        -- dynamically get the width of the tree
        width = get_width,
        -- Always open the tree on the left side of the screen
        side = "left",
        -- Never display the number line for the tree
        number = false,
      },
      renderer = {
        -- Never add trailing slashes for folders name
        add_trailing = false,
        -- Never group directories in the tree for those that only have one child node
        group_empty = false,
        -- Never highlight any files in a special way
        special_files = {},
        -- Highlight files that have diagnostics
        highlight_diagnostics = true
      },
      update_focused_file = {
        -- Focus the file in the tree whenever it is focused in the editor
        enable = true
      },
      diagnostics = {
        -- Enable diagnostics for the tree
        enable = true,
        -- Show diagnostics for the parent folder of the incriminated file
        show_on_dirs = true
      }
    })

    local whichKey = require("which-key")

    whichKey.add({
      { "<leader>n", group = "NvimTree" },
      { "<leader>nt", function() nvimTreeApi.tree.toggle() end, desc = "Toggle" },
      { "<leader>nf", function() nvimTreeApi.tree.focus() end, desc = "Focus" },
      { "<leader>ne", function() nvimTreeApi.tree.expand_all() end, desc = "Expand All" },
      { "<leader>nc", function() nvimTreeApi.tree.collapse_all() end, desc = "Collapse All" },
      { "<leader>nw", group = "Width" },
      { "<leader>nwi", increment_width, desc = "Increase" },
      { "<leader>nwd", decrement_width, desc = "Decrease" },
      { "<leader>nwa", dynamic_width, desc = "Decrease" },
      { "<leader>nt", function() nvimTreeApi.tree.toggle() end, desc = "Toggle" },
    })
  end,
}