neovim-config/lua/data/autocmd.lua

---@module "data.autocmd"
--- This module defines the autocommands for the Neovim configuration.
--          ╭─────────────────────────────────────────────────────────╮
--          │                        Autocommands                     │
--          ╰─────────────────────────────────────────────────────────╯
local M = {}

local augroup = vim.api.nvim_create_augroup
local autocmd = vim.api.nvim_create_autocmd

M.cpp_picker = function()
  augroup('cpp_picker', { clear = true })
  -- C++ Picker
  autocmd('FileType', {
    group = 'cpp_picker',
    pattern = { 'cpp', 'c', 'h', 'hpp' },
    callback = function()
      require('data.func').add_keymap(require('data.keys').cpp_picker)
    end,
  })
end

M.minifiles = {
  --- Function to dynamically resize the preview window
  dynamic_resize = function()
    local function update_width_preview()
      local multiplier = 0.25
      if vim.g.minifiles_width ~= nil then
        multiplier = vim.g.minifiles_width
      end
      if package.loaded['mini.files'] then
        -- Obtain the existing config
        local config = require('mini.files').config
        -- Update the width_preview based on the current window size
        if multiplier > 1 then
          -- If the multiplier is greater than 1, use as the preview width
          config.windows.width_preview = multiplier
        else
          -- Otherwise, use the current window width multiplied by the multiplier
          config.windows.width_preview = math.floor(vim.o.columns * multiplier)
        end
        -- Apply the updated config
        require('mini.files').setup(config)
      end
    end

    -- Flag to determine if mini.files is currently in use
    local is_mini_files_active = false

    -- Autocommand group to handle dynamic resizing
    augroup('MiniFilesDynamicWidth', { clear = true })

    -- Handle mini.files open event to set the flag
    autocmd('User', {
      group = 'MiniFilesDynamicWidth',
      pattern = 'MiniFilesExplorerOpen',
      callback = function()
        is_mini_files_active = true
      end,
    })

    -- Handle mini.files close event to reset the flag and update the preview width
    autocmd('User', {
      group = 'MiniFilesDynamicWidth',
      pattern = 'MiniFilesExplorerClose',
      callback = function()
        is_mini_files_active = false
        update_width_preview()
      end,
    })

    -- Handle window resize event
    autocmd('VimResized', {
      group = 'MiniFilesDynamicWidth',
      callback = function()
        if is_mini_files_active then
          -- Defer the update until mini.files closes
          autocmd('User', {
            group = 'MiniFilesDynamicWidth',
            pattern = 'MiniFilesExplorerClose',
            callback = update_width_preview,
            once = true, -- Ensure this runs only once
          })
        else
          -- If mini.files is not active, update immediately
          update_width_preview()
        end
      end,
    })
  end,
}

-- Create an autogroup for the TermInsertMode autocmds
local TermInsertMode = augroup('TermInsertMode', { clear = true })

-- Start terminal in insert mode
autocmd({ 'TermOpen' }, {
  group = TermInsertMode,
  pattern = { '*' },
  callback = function()
    if vim.opt.buftype:get() == 'terminal' then
      -- if filetype does not contain 'dashboard'
      if not string.find(vim.opt.filetype:get(), 'dashboard') then
        -- If window is editable
        if vim.opt.modifiable:get() then
          vim.cmd(':startinsert')
        end
      end
    end
  end,
})

-- When entering a terminal buffer auto switch to insert mode
-- I could use TermEnter event but it does not work when switching between window splits
autocmd({ 'BufEnter' }, {
  group = TermInsertMode,
  pattern = { '*' },
  callback = function()
    if vim.opt.buftype:get() == 'terminal' then
      -- if filetype does not contain 'dashboard'
      if not string.find(vim.opt.filetype:get(), 'dashboard') then
        -- If window is editable
        if vim.opt.modifiable:get() then
          vim.cmd(':startinsert')
        end
      end
    end
  end,
})

-- Update OSC7 in fish shell
local function update_osc7()
  local cwd = vim.fn.getcwd()
  local uri = 'file://' .. vim.fn.hostname() .. cwd
  io.stdout:write('\27]7;' .. uri .. '\27\\')
end

-- Save CWD where we can access it
local function save_cwd()
  local cwd = vim.fn.getcwd()
  local file = io.open(os.getenv('HOME') .. '/.nvim_last_dir', 'w')
  if file then
    file:write(cwd)
    file:close()
  end
end

-- Update OSC7 and file on directory change
autocmd('DirChanged', {
  callback = function()
    save_cwd()
    update_osc7()
  end,
})

-- Save on exit
autocmd('VimLeavePre', {
  callback = save_cwd,
})

-- Send OSC 7 on startup
update_osc7()

-- Save CWD on startup
save_cwd()

return M