path: root/lua/user/mods.lua

local M = {}

--- Shorten Function Names
local fn = vim.fn
function M.executable(name)
  if fn.executable(name) > 0 then
    return true
  end

  return false
end

--------------------------------------------------

--- Check whether a feature exists in Nvim
--- @feat: string
---   the feature name, like `nvim-0.7` or `unix`.
--- return: bool
M.has = function(feat)
  if fn.has(feat) == 1 then
    return true
  end

  return false
end

--------------------------------------------------

-- Format on save
local format_augroup = vim.api.nvim_create_augroup('LspFormatting', {})
require('null-ls').setup({
  -- you can reuse a shared lspconfig on_attach callback here
  on_attach = function(client, bufnr)
    if client.supports_method('textDocument/formatting') then
      vim.api.nvim_clear_autocmds({ group = format_augroup, buffer = bufnr })
      vim.api.nvim_create_autocmd('BufWritePre', {
        group = format_augroup,
        buffer = bufnr,
        callback = function()
          -- on 0.8, you should use vim.lsp.buf.format({ bufnr = bufnr }) instead
          --vim.lsp.buf.formatting_seq_sync()
          vim.lsp.buf.format({ bufnr = bufnr })
        end,
      })
    end
  end,
})

vim.cmd([[autocmd BufWritePre <buffer> lua vim.lsp.buf.format()]])
--vim.cmd [[autocmd BufWritePre * lua vim.lsp.buf.format()]]

--------------------------------------------------

---Determine if a value of any type is empty
---@param item any
---@return boolean?
function M.empty(item)
  if not item then
    return true
  end
  local item_type = type(item)
  if item_type == 'string' then
    return item == ''
  end
  if item_type == 'number' then
    return item <= 0
  end
  if item_type == 'table' then
    return vim.tbl_isempty(item)
  end
  return item ~= nil
end

--------------------------------------------------

--- Create a dir if it does not exist
function M.may_create_dir(dir)
  local res = fn.isdirectory(dir)

  if res == 0 then
    fn.mkdir(dir, 'p')
  end
end

--------------------------------------------------

--- Toggle cmp completion
vim.g.cmp_toggle_flag = false -- initialize
local normal_buftype = function()
  return vim.api.nvim_buf_get_option(0, 'buftype') ~= 'prompt'
end
M.toggle_completion = function()
  local ok, cmp = pcall(require, 'cmp')
  if ok then
    local next_cmp_toggle_flag = not vim.g.cmp_toggle_flag
    if next_cmp_toggle_flag then
      print('completion on')
    else
      print('completion off')
    end
    cmp.setup({
      enabled = function()
        vim.g.cmp_toggle_flag = next_cmp_toggle_flag
        if next_cmp_toggle_flag then
          return normal_buftype
        else
          return next_cmp_toggle_flag
        end
      end,
    })
  else
    print('completion not available')
  end
end

--------------------------------------------------

--- Make sure using latest neovim version
function M.get_nvim_version()
  local actual_ver = vim.version()

  local nvim_ver_str = string.format('%d.%d.%d', actual_ver.major, actual_ver.minor, actual_ver.patch)
  return nvim_ver_str
end

function M.add_pack(name)
  local status, error = pcall(vim.cmd, 'packadd ' .. name)

  return status
end

--------------------------------------------------

-- Define a global function to retrieve LSP clients based on Neovim version
function M.get_lsp_clients(bufnr)
  local mods = require('user.mods')
  --local expected_ver = '0.10.0'
  local nvim_ver = mods.get_nvim_version()

  local version_major, version_minor = string.match(nvim_ver, '(%d+)%.(%d+)')
  version_major = tonumber(version_major)
  version_minor = tonumber(version_minor)

  if version_major > 0 or (version_major == 0 and version_minor >= 10) then
    return vim.lsp.get_clients({ buffer = bufnr })
  else
    return vim.lsp.buf_get_clients()
  end
end

--------------------------------------------------

--- Toggle autopairs on/off (requires "windwp/nvim-autopairs")
function M.Toggle_autopairs()
  local ok, autopairs = pcall(require, 'nvim-autopairs')
  if ok then
    if autopairs.state.disabled then
      autopairs.enable()
      print('autopairs on')
    else
      autopairs.disable()
      print('autopairs off')
    end
  else
    print('autopairs not available')
  end
end

--------------------------------------------------

--- Make vim-rooter message disappear after making it's changes
--vim.cmd([[
--let timer = timer_start(1000, 'LogTrigger', {})
--func! LogTrigger(timer)
--  silent!
--endfunc
--]])
--
--vim.cmd([[
--function! ConfigureChDir()
--  echo ('')
--endfunction
--" Call after vim-rooter changes the root dir
--autocmd User RooterChDir :sleep! | call LogTrigger(timer) | call ConfigureChDir()
--]])

function M.findFilesInCwd()
  vim.cmd('let g:rooter_manual_only = 1') -- Toggle the rooter plugin
  require('plugins.telescope').findhere()
  vim.defer_fn(function()
    vim.cmd('let g:rooter_manual_only = 0') -- Change back to automatic rooter
  end, 100)
end

--function M.findFilesInCwd()
--  vim.cmd("let g:rooter_manual_only = 1") -- Toggle the rooter plugin
--  require("plugins.telescope").findhere()
--  --vim.cmd("let g:rooter_manual_only = 0") -- Change back to automatic rooter
--end

--------------------------------------------------

-- Toggle the executable permission
function M.Toggle_executable()
  local current_file = vim.fn.expand('%:p')
  local executable = vim.fn.executable(current_file) == 1

  if executable then
    -- File is executable, unset the executable permission
    vim.fn.system('chmod -x ' .. current_file)
    --print(current_file .. ' is no longer executable.')
    print('No longer executable')
  else
    -- File is not executable, set the executable permission
    vim.fn.system('chmod +x ' .. current_file)
    --print(current_file .. ' is now executable.')
    print('Now executable')
  end
end

--------------------------------------------------

-- Set bare dotfiles repository git environment variables dynamically

-- Set git enviornment variables
--function M.Set_git_env_vars()
--  local git_dir_job = vim.fn.jobstart({ "git", "rev-parse", "--git-dir" })
--  local command_status = vim.fn.jobwait({ git_dir_job })[1]
--  if command_status > 0 then
--    vim.env.GIT_DIR = vim.fn.expand("$HOME/.cfg")
--    vim.env.GIT_WORK_TREE = vim.fn.expand("~")
--  else
--    vim.env.GIT_DIR = nil
--    vim.env.GIT_WORK_TREE = nil
--  end
--  -- Launch terminal emulator with Git environment variables set
--  --require("toggleterm").exec(string.format([[%s %s]], os.getenv("SHELL"), "-i"))
--end

------

local prev_cwd = ''

function M.Set_git_env_vars()
  local cwd = vim.fn.getcwd()
  if prev_cwd == '' then
    -- First buffer being opened, set prev_cwd to cwd
    prev_cwd = cwd
  elseif cwd ~= prev_cwd then
    -- Working directory has changed since last buffer was opened
    prev_cwd = cwd
    local git_dir_job = vim.fn.jobstart({ 'git', 'rev-parse', '--git-dir' })
    local command_status = vim.fn.jobwait({ git_dir_job })[1]
    if command_status > 0 then
      vim.env.GIT_DIR = vim.fn.expand('$HOME/.cfg')
      vim.env.GIT_WORK_TREE = vim.fn.expand('~')
    else
      vim.env.GIT_DIR = nil
      vim.env.GIT_WORK_TREE = nil
    end
  end
end

vim.cmd([[augroup my_git_env_vars]])
vim.cmd([[  autocmd!]])
vim.cmd([[  autocmd BufEnter * lua require('user.mods').Set_git_env_vars()]])
vim.cmd([[  autocmd VimEnter * lua require('user.mods').Set_git_env_vars()]])
vim.cmd([[augroup END]])

--------------------------------------------------

--- Update Tmux Status Vi-mode
function M.update_tmux_status()
  local mode = vim.api.nvim_eval('mode()')
  -- Determine the mode name based on the mode value
  local mode_name
  if mode == 'n' then
    mode_name = '-- NORMAL --'
  elseif mode == 'i' or mode == 'ic' then
    mode_name = '-- INSERT --'
  else
    mode_name = '-- NORMAL --' --'-- COMMAND --'
  end

  -- Write the mode name to the file
  local file = io.open(os.getenv('HOME') .. '/.vi-mode', 'w')
  file:write(mode_name)
  file:close()
  if nvim_running then
    -- Neovim is running, update the mode file and refresh tmux
    VI_MODE = '' -- Clear VI_MODE to show Neovim mode
    vim.cmd('silent !tmux refresh-client -S')
  end
  ---- Force tmux to update the status
  vim.cmd('silent !tmux refresh-client -S')
end

vim.cmd([[
  augroup TmuxStatus
    autocmd!
    autocmd InsertLeave,InsertEnter * lua require("user.mods").update_tmux_status()
    autocmd VimEnter * lua require("user.mods").update_tmux_status()
    autocmd BufEnter * lua require("user.mods").update_tmux_status()
    autocmd ModeChanged * lua require("user.mods").update_tmux_status()
    autocmd WinEnter,WinLeave * lua require("user.mods").update_tmux_status()
  augroup END
]])

-- Add autocmd for <esc>
-- Add autocmd to check when tmux switches panes/windows
--autocmd InsertLeave,InsertEnter * lua require("user.mods").update_tmux_status()
--autocmd BufEnter * lua require("user.mods").update_tmux_status()
--autocmd WinEnter,WinLeave * lua require("user.mods").update_tmux_status()

--autocmd WinEnter,WinLeave * lua require("user.mods").update_tmux_status()
--autocmd VimResized * lua require("user.mods").update_tmux_status()
--autocmd FocusGained * lua require("user.mods").update_tmux_status()
--autocmd FocusLost * lua require("user.mods").update_tmux_status()
--autocmd CmdwinEnter,CmdwinLeave * lua require("user.mods").update_tmux_status()

--------------------------------------------------

-- function OpenEmulatorList()
-- 	local emulatorsBuffer = vim.api.nvim_create_buf(false, true)
-- 	vim.api.nvim_buf_set_lines(emulatorsBuffer, 0, 0, true, {"Some text"})
-- 	vim.api.nvim_open_win(
-- 		emulatorsBuffer,
-- 		false,
-- 		{
-- 			relative='win', row=3, col=3, width=12, height=3
-- 		}
-- 	)
-- end
--
-- vim.api.nvim_create_user_command('OpenEmulators', OpenEmulatorList, {})

--local api = vim.api
--local fn = vim.fn
--local cmd = vim.cmd
--
--local function bufremove(opts)
--  local target_buf_id = api.nvim_get_current_buf()
--
--  -- Do nothing if buffer is in modified state.
--  if not opts.force and api.nvim_buf_get_option(target_buf_id, 'modified') then
--    return false
--  end
--
--  -- Hide target buffer from all windows.
--  vim.tbl_map(function(win_id)
--    win_id = win_id or 0
--
--    local current_buf_id = api.nvim_win_get_buf(win_id)
--
--    api.nvim_win_call(win_id, function()
--      -- Try using alternate buffer
--      local alt_buf_id = fn.bufnr('#')
--      if alt_buf_id ~= current_buf_id and fn.buflisted(alt_buf_id) == 1 then
--        api.nvim_win_set_buf(win_id, alt_buf_id)
--        return
--      end
--
--      -- Try using previous buffer
--      cmd('bprevious')
--      if current_buf_id ~= api.nvim_win_get_buf(win_id) then
--        return
--      end
--
--      -- Create new listed scratch buffer
--      local new_buf = api.nvim_create_buf(true, true)
--      api.nvim_win_set_buf(win_id, new_buf)
--    end)
--
--    return true
--  end, fn.win_findbuf(target_buf_id))
--
--  cmd(string.format('bdelete%s %d', opts.force and '!' or '', target_buf_id))
--end
--
---- Assign bufremove to a global variable
--_G.bufremove = bufremove

--vim.cmd([[
--  augroup NvimTreeDelete
--    autocmd!
--    autocmd FileType NvimTree lua require('user.mods').enew_on_delete()
--  augroup END
--]])
--
--function M.enew_on_delete()
--  if vim.bo.buftype == 'nofile' then
--    vim.cmd('enew')
--  end
--end

-- Update Neovim
--function M.Update_neovim()
--  -- Run the commands to download and extract the latest version
--  os.execute("curl -L -o nvim-linux64.tar.gz https://github.com/neovim/neovim/releases/latest/download/nvim-linux64.tar.gz")
--  os.execute("tar xzvf nvim-linux64.tar.gz")
--  -- Replace the existing Neovim installation with the new version
--  os.execute("rm -rf $HOME/.local/bin/nvim")
--  os.execute("mv nvim-linux64 $HOME/.local/bin/nvim")
--
--  -- Clean up the downloaded file
--  os.execute("rm nvim-linux64.tar.gz")
--
--  -- Print a message to indicate the update is complete
--  print("Neovim has been updated to the latest version.")
--end
--
---- Bind a keymap to the update_neovim function (optional)
--vim.api.nvim_set_keymap('n', '<leader>u', '<cmd> lua require("user.mods").Update_neovim()<CR>', { noremap = true, silent = true })

-- Define a function to create a floating window and run the update process inside it
function M.Update_neovim()
  -- Create a new floating window
  local bufnr, winid = vim.api.nvim_create_buf(false, true)
  vim.api.nvim_open_win(bufnr, true, {
    relative = 'editor',
    width = 80,
    height = 20,
    row = 2,
    col = 2,
    style = 'minimal',
    border = 'single',
  })

  -- Function to append a line to the buffer in the floating window
  local function append_line(line)
    vim.api.nvim_buf_set_option(bufnr, 'modifiable', true)
    vim.api.nvim_buf_set_lines(bufnr, -1, -1, false, { line })
    vim.api.nvim_buf_set_option(bufnr, 'modifiable', false)
  end

  -- Download the latest version of Neovim
  append_line('Downloading the latest version of Neovim...')
  os.execute('curl -L -o nvim-linux64.tar.gz https://github.com/neovim/neovim/releases/latest/download/nvim-linux64.tar.gz')
  append_line('Download complete.')

  -- Extract the downloaded archive
  append_line('Extracting the downloaded archive...')
  os.execute('tar xzvf nvim-linux64.tar.gz')
  append_line('Extraction complete.')

  -- Replace the existing Neovim installation with the new version
  append_line('Replacing the existing Neovim installation...')
  os.execute('rm -rf $HOME/nvim')
  os.execute('mv nvim-linux64 $HOME/nvim')
  append_line('Update complete.')

  -- Clean up the downloaded file
  append_line('Cleaning up the downloaded file...')
  os.execute('rm nvim-linux64.tar.gz')
  append_line('Cleanup complete.')

  -- Close the floating window after a delay
  vim.defer_fn(function()
    vim.api.nvim_win_close(winid, true)
  end, 5000) -- Adjust the delay as needed
end

-- Bind a keymap to the update_neovim function (optional)
vim.api.nvim_set_keymap('n', '<leader>U', '<cmd> lua require("user.mods").Update_neovim()<CR>', { noremap = true, silent = true })

--------------------------------------------------

-- Fix or suppress closing nvim error message (/src/unix/core.c:147: uv_close: Assertion `!uv__is_closing(handle)' failed.)
vim.api.nvim_create_autocmd({ 'VimLeave' }, {
  callback = function()
    vim.fn.jobstart('!notify-send 2>/dev/null &', { detach = true })
  end,
})

--------------------------------------------------

-- Rooter
--vim.cmd([[autocmd BufEnter * lua vim.cmd('Rooter')]])

--------------------------------------------------

-- Nvim-tree
local modifiedBufs = function(bufs) -- nvim-tree is also there in modified buffers so this function filter it out
  local t = 0
  for k, v in pairs(bufs) do
    if v.name:match('NvimTree_') == nil then
      t = t + 1
    end
  end
  return t
end

-- Deleting current file opened behaviour
function M.DeleteCurrentBuffer()
  local cbn = vim.api.nvim_get_current_buf()
  local buffers = vim.fn.getbufinfo({ buflisted = true })
  local size = #buffers
  local idx = 0

  for n, e in ipairs(buffers) do
    if e.bufnr == cbn then
      idx = n
      break -- Exit loop as soon as we find the buffer
    end
  end

  if idx == 0 then
    return
  end

  if idx == size then
    vim.cmd('bprevious')
  else
    vim.cmd('bnext')
  end

  vim.cmd('silent! bdelete ' .. cbn)

  -- Open a new blank window
  vim.cmd('silent! enew') -- Opens a new vertical split
  -- OR
  -- vim.cmd("new")  -- Opens a new horizontal split
  -- Delay before opening a new split
  --vim.defer_fn(function()
  --  vim.cmd("enew") -- Opens a new vertical split
  --end, 100)         -- Adjust the delay as needed (in milliseconds)
  -- Delay before closing the nvim-tree window
end

vim.cmd([[autocmd FileType NvimTree lua require("user.mods").DeleteCurrentBuffer()]])

-- On :bd nvim-tree should behave as if it wasn't opened
vim.api.nvim_create_autocmd('BufEnter', {
  nested = true,
  callback = function()
    -- Only 1 window with nvim-tree left: we probably closed a file buffer
    if #vim.api.nvim_list_wins() == 1 and require('nvim-tree.utils').is_nvim_tree_buf() then
      local api = require('nvim-tree.api')
      -- Required to let the close event complete. An error is thrown without this.
      vim.defer_fn(function()
        -- close nvim-tree: will go to the last buffer used before closing
        api.tree.toggle({ find_file = true, focus = true })
        -- re-open nivm-tree
        api.tree.toggle({ find_file = true, focus = true })
        -- nvim-tree is still the active window. Go to the previous window.
        vim.cmd('wincmd p')
      end, 0)
    end
  end,
})

-- Dismiss notifications when opening nvim-tree window
local function isNvimTreeOpen()
  local win = vim.fn.win_findbuf(vim.fn.bufnr('NvimTree'))
  return vim.fn.empty(win) == 0
end

function M.DisableNotify()
  if isNvimTreeOpen() then
    require('notify').dismiss()
  end
end

vim.cmd([[
  autocmd! WinEnter,WinLeave * lua require('user.mods').DisableNotify()
]])

--------------------------------------------------

-- Toggle Dashboard
function M.toggle_dashboard()
  if vim.bo.filetype == 'dashboard' then
    vim.cmd('bdelete')
  else
    vim.cmd('Dashboard')
  end
end

--------------------------------------------------

-- Helper function to suppress errors
local function silent_execute(cmd)
  vim.fn['serverlist']() -- Required to prevent 'Press ENTER' prompt
  local result = vim.fn.system(cmd .. ' 2>/dev/null')
  vim.fn['serverlist']()
  return result
end

--------------------------------------------------

-- Toggle Codi
-- Define a global variable to track Codi's state
local is_codi_open = false

function M.toggleCodi()
  if is_codi_open then
    -- Close Codi
    vim.cmd('Codi!')
    is_codi_open = false
    print('Codi off')
  else
    -- Open Codi
    vim.cmd('Codi')
    is_codi_open = true
    print('Codi on')
  end
end

--------------------------------------------------

---- Function to create or toggle a scratch buffer
-- Define global variables to store the scratch buffer and window
local scratch_buf = nil
local scratch_win = nil

-- Other global variables
local scratch_date = os.date('%Y-%m-%d')
local scratch_dir = vim.fn.expand('~/notes/private')
local scratch_file = 'scratch-' .. scratch_date .. '.md'

-- Function to close and delete a buffer
function CloseAndDeleteBuffer(bufnr)
  if bufnr and vim.api.nvim_buf_is_valid(bufnr) then
    vim.api.nvim_command('silent! bwipe ' .. bufnr)
  end
end

function M.Scratch(Split_direction)
  -- Check if the directory exists, and create it if it doesn't
  if vim.fn.isdirectory(scratch_dir) == 0 then
    vim.fn.mkdir(scratch_dir, 'p')
  end

  -- Determine the window type based on Split_direction
  local current_window_type = 'float'
  if Split_direction == 'float' then
    current_window_type = 'float'
  elseif Split_direction == 'vertical' then
    current_window_type = 'vertical'
  elseif Split_direction == 'horizontal' then
    current_window_type = 'horizontal'
  end

  local file_path = scratch_dir .. '/' .. scratch_file

  if scratch_win and vim.api.nvim_win_is_valid(scratch_win) then
    -- Window exists, save buffer to file and close it
    WriteScratchBufferToFile(scratch_buf, file_path)
    vim.cmd(':w!')
    vim.api.nvim_win_close(scratch_win, true)
    CloseAndDeleteBuffer(scratch_buf)
    scratch_win = nil
    scratch_buf = nil
  else
    if scratch_buf and vim.api.nvim_buf_is_valid(scratch_buf) then
      -- Buffer exists, reuse it and open a new window
      OpenScratchWindow(scratch_buf, current_window_type)
    else
      -- Buffer doesn't exist, create it and load the file if it exists
      scratch_buf = OpenScratchBuffer(file_path)
      OpenScratchWindow(scratch_buf, current_window_type)
    end
  end
end

-- Function to write buffer contents to a file
function WriteScratchBufferToFile(buf, file_path)
  if buf and vim.api.nvim_buf_is_valid(buf) then
    local lines = vim.api.nvim_buf_get_lines(buf, 0, -1, false)
    local content = table.concat(lines, '\n')
    local escaped_file_path = vim.fn.fnameescape(file_path)

    -- Write the buffer content to the file
    local file = io.open(escaped_file_path, 'w')
    if file then
      file:write(content)
      file:close()
    end
  end
end

-- Function to create or open the scratch buffer
function OpenScratchBuffer(file_path)
  local buf = vim.api.nvim_create_buf(true, false)

  -- Set the file name for the buffer
  local escaped_file_path = vim.fn.fnameescape(file_path)
  vim.api.nvim_buf_set_name(buf, escaped_file_path)

  -- Check if the file exists and load it if it does
  if vim.fn.filereadable(file_path) == 1 then
    local file_contents = vim.fn.readfile(file_path)
    vim.api.nvim_buf_set_lines(buf, 0, -1, true, file_contents)
  else
    -- Insert initial content
    vim.api.nvim_buf_set_lines(buf, 0, -1, true, {
      '# Quick Notes - ' .. scratch_date,
      '--------------------------',
      '',
    })

    -- Save the initial content to the file
    vim.cmd(':w')
  end

  return buf
end

-- Function to open the scratch buffer in a window
function OpenScratchWindow(buf, current_window_type)
  if buf and vim.api.nvim_buf_is_valid(buf) then
    if current_window_type == 'float' then
      local opts = {
        relative = 'win',
        width = 120,
        height = 10,
        border = 'single',
        row = 20,
        col = 20,
      }
      scratch_win = vim.api.nvim_open_win(buf, true, opts)
      -- Go to the last line of the buffer
      vim.api.nvim_win_set_cursor(scratch_win, { vim.api.nvim_buf_line_count(buf), 1 })
    elseif current_window_type == 'vertical' then
      vim.cmd('vsplit')
      vim.api.nvim_win_set_buf(0, buf)
      scratch_win = 0
    elseif current_window_type == 'horizontal' then
      vim.cmd('split')
      vim.api.nvim_win_set_buf(0, buf)
      scratch_win = 0
    end
  end
end

--------------------------------------------------

-- Intercept file open
local augroup = vim.api.nvim_create_augroup('user-autocmds', { clear = true })
local intercept_file_open = true
vim.api.nvim_create_user_command('InterceptToggle', function()
  intercept_file_open = not intercept_file_open
  local intercept_state = '`Enabled`'
  if not intercept_file_open then
    intercept_state = '`Disabled`'
  end
  vim.notify('Intercept file open set to ' .. intercept_state, vim.log.levels.INFO, {
    title = 'Intercept File Open',
    ---@param win integer The window handle
    on_open = function(win)
      vim.api.nvim_buf_set_option(vim.api.nvim_win_get_buf(win), 'filetype', 'markdown')
    end,
  })
end, { desc = 'Toggles intercepting BufNew to open files in custom programs' })

-- NOTE: Add "BufReadPre" to the autocmd events to also intercept files given on the command line, e.g.
-- `nvim myfile.txt`
vim.api.nvim_create_autocmd({ 'BufNew' }, {
  group = augroup,
  callback = function(args)
    ---@type string
    local path = args.match
    ---@type integer
    local bufnr = args.buf

    ---@type string? The file extension if detected
    local extension = vim.fn.fnamemodify(path, ':e')
    ---@type string? The filename if detected
    local filename = vim.fn.fnamemodify(path, ':t')

    ---Open a given file path in a given program and remove the buffer for the file.
    ---@param buf integer The buffer handle for the opening buffer
    ---@param fpath string The file path given to the program
    ---@param fname string The file name used in notifications
    ---@param prog string The program to execute against the file path
    local function open_in_prog(buf, fpath, fname, prog)
      vim.notify(string.format('Opening `%s` in `%s`', fname, prog), vim.log.levels.INFO, {
        title = 'Open File in External Program',
        ---@param win integer The window handle
        on_open = function(win)
          vim.api.nvim_buf_set_option(vim.api.nvim_win_get_buf(win), 'filetype', 'markdown')
        end,
      })
      local mods = require('user.mods')
      local nvim_ver = mods.get_nvim_version()

      local version_major, version_minor = string.match(nvim_ver, '(%d+)%.(%d+)')
      version_major = tonumber(version_major)
      version_minor = tonumber(version_minor)

      if version_major > 0 or (version_major == 0 and version_minor >= 10) then
        vim.system({ prog, fpath }, { detach = true })
      else
        vim.fn.jobstart({ prog, fpath }, { detach = true })
      end
      vim.api.nvim_buf_delete(buf, { force = true })
    end

    local extension_callbacks = {
      ['pdf'] = function(buf, fpath, fname)
        open_in_prog(buf, fpath, fname, 'zathura')
      end,
      ['png'] = function(buf, fpath, fname)
        open_in_prog(buf, fpath, fname, 'feh')
      end,
      ['jpg'] = 'png',
      ['mp4'] = function(buf, fpath, fname)
        open_in_prog(buf, fpath, fname, 'mpv')
      end,
      ['gif'] = 'mp4',
    }

    ---Get the extension callback for a given extension. Will do a recursive lookup if an extension callback is actually
    ---of type string to get the correct extension
    ---@param ext string A file extension. Example: `png`.
    ---@return fun(bufnr: integer, path: string, filename: string?) extension_callback The extension callback to invoke, expects a buffer handle, file path, and filename.
    local function extension_lookup(ext)
      local callback = extension_callbacks[ext]
      if type(callback) == 'string' then
        callback = extension_lookup(callback)
      end
      return callback
    end

    if extension ~= nil and not extension:match('^%s*$') and intercept_file_open then
      local callback = extension_lookup(extension)
      if type(callback) == 'function' then
        callback(bufnr, path, filename)
      end
    end
  end,
})

--------------------------------------------------

-- Delete [No Name] buffers
vim.api.nvim_create_autocmd('BufHidden', {
  desc = 'Delete [No Name] buffers',
  callback = function(event)
    if event.file == '' and vim.bo[event.buf].buftype == '' and not vim.bo[event.buf].modified then
      vim.schedule(function()
        pcall(vim.api.nvim_buf_delete, event.buf, {})
      end)
    end
  end,
})

--------------------------------------------------

-- ...
return M