local t = require('test.testutil')
local n = require('test.functional.testnvim')()
local Screen = require('test.functional.ui.screen')

local assert_alive = n.assert_alive
local assert_log = t.assert_log
local api = n.api
local command = n.command
local clear = n.clear
local exc_exec = n.exc_exec
local exec_lua = n.exec_lua
local eval = n.eval
local eq = t.eq
local ok = t.ok
local fn = n.fn
local insert = n.insert
local neq = t.neq
local mkdir = t.mkdir
local rmdir = n.rmdir
local alter_slashes = n.alter_slashes
local tbl_contains = vim.tbl_contains
local expect_exit = n.expect_exit
local check_close = n.check_close
local is_os = t.is_os

local testlog = 'Xtest-defaults-log'

describe('startup defaults', function()
  describe(':filetype', function()
    local function expect_filetype(expected)
      local screen = Screen.new(50, 4)
      screen:attach()
      command('filetype')
      screen:expect([[
        ^                                                  |
        {1:~                                                 }|*2
        ]] .. expected)
    end

    it('all ON after `-u NORC`', function()
      clear('-u', 'NORC')
      expect_filetype('filetype detection:ON  plugin:ON  indent:ON       |')
    end)

    it('all ON after `:syntax …` #7765', function()
      clear('-u', 'NORC', '--cmd', 'syntax on')
      expect_filetype('filetype detection:ON  plugin:ON  indent:ON       |')
      clear('-u', 'NORC', '--cmd', 'syntax off')
      expect_filetype('filetype detection:ON  plugin:ON  indent:ON       |')
    end)

    it('all OFF after `-u NONE`', function()
      clear('-u', 'NONE')
      expect_filetype('filetype detection:OFF  plugin:OFF  indent:OFF    |')
    end)

    it('explicit OFF stays OFF', function()
      clear('-u', 'NORC', '--cmd', 'syntax off | filetype off | filetype plugin indent off')
      expect_filetype('filetype detection:OFF  plugin:OFF  indent:OFF    |')
      clear('-u', 'NORC', '--cmd', 'syntax off | filetype plugin indent off')
      expect_filetype('filetype detection:ON  plugin:OFF  indent:OFF     |')
      clear('-u', 'NORC', '--cmd', 'filetype indent off')
      expect_filetype('filetype detection:ON  plugin:ON  indent:OFF      |')
      clear('-u', 'NORC', '--cmd', 'syntax off | filetype off')
      expect_filetype('filetype detection:OFF  plugin:(on)  indent:(on)  |')
      -- Swap the order.
      clear('-u', 'NORC', '--cmd', 'filetype off | syntax off')
      expect_filetype('filetype detection:OFF  plugin:(on)  indent:(on)  |')
    end)

    it('all ON after early `:filetype … on`', function()
      -- `:filetype … on` should not change the defaults. #7765
      -- Only an explicit `:filetype … off` sets OFF.

      clear('-u', 'NORC', '--cmd', 'filetype on')
      expect_filetype('filetype detection:ON  plugin:ON  indent:ON       |')
      clear('-u', 'NORC', '--cmd', 'filetype plugin on')
      expect_filetype('filetype detection:ON  plugin:ON  indent:ON       |')
      clear('-u', 'NORC', '--cmd', 'filetype indent on')
      expect_filetype('filetype detection:ON  plugin:ON  indent:ON       |')
    end)

    it('late `:filetype … off` stays OFF', function()
      clear('-u', 'NORC', '-c', 'filetype off')
      expect_filetype('filetype detection:OFF  plugin:(on)  indent:(on)  |')
      clear('-u', 'NORC', '-c', 'filetype plugin off')
      expect_filetype('filetype detection:ON  plugin:OFF  indent:ON      |')
      clear('-u', 'NORC', '-c', 'filetype indent off')
      expect_filetype('filetype detection:ON  plugin:ON  indent:OFF      |')
    end)
  end)

  describe('syntax', function()
    it('enabled by `-u NORC`', function()
      clear('-u', 'NORC')
      eq(1, eval('g:syntax_on'))
    end)

    it('disabled by `-u NONE`', function()
      clear('-u', 'NONE')
      eq(0, eval('exists("g:syntax_on")'))
    end)

    it('`:syntax off` stays off', function()
      -- early
      clear('-u', 'NORC', '--cmd', 'syntax off')
      eq(0, eval('exists("g:syntax_on")'))
      -- late
      clear('-u', 'NORC', '-c', 'syntax off')
      eq(0, eval('exists("g:syntax_on")'))
    end)

    it('":if 0|syntax on|endif" does not affect default #8728', function()
      clear('-u', 'NORC', '--cmd', ':if 0|syntax on|endif')
      eq(1, eval('exists("g:syntax_on")'))
      clear('-u', 'NORC', '--cmd', ':if 0|syntax off|endif')
      eq(1, eval('exists("g:syntax_on")'))
    end)
  end)

  describe("'fillchars'", function()
    it('vert/fold flags', function()
      clear()
      local screen = Screen.new(50, 5)
      screen:attach()
      command('set laststatus=0')
      insert([[
        1
        2
        3
        4]])
      command('normal! ggjzfj')
      command('vsp')
      screen:expect([[
        1                        │1                       |
        {13:^+--  2 lines: 2··········}│{13:+--  2 lines: 2·········}|
        4                        │4                       |
        {1:~                        }│{1:~                       }|
                                                          |
      ]])

      -- ambiwidth=double defaults to single-byte fillchars.
      command('set ambiwidth=double')
      screen:expect([[
        1                        |1                       |
        {13:^+--  2 lines: 2----------}|{13:+--  2 lines: 2---------}|
        4                        |4                       |
        {1:~                        }|{1:~                       }|
                                                          |
      ]])

      -- change "vert" character to single-cell
      fn.setcellwidths({ { 0x2502, 0x2502, 1 } })
      screen:expect([[
        1                        │1                       |
        {13:^+--  2 lines: 2----------}│{13:+--  2 lines: 2---------}|
        4                        │4                       |
        {1:~                        }│{1:~                       }|
                                                          |
      ]])

      -- change "vert" character to double-cell
      fn.setcellwidths({ { 0x2502, 0x2502, 2 } })
      screen:expect([[
        1                        |1                       |
        {13:^+--  2 lines: 2----------}|{13:+--  2 lines: 2---------}|
        4                        |4                       |
        {1:~                        }|{1:~                       }|
                                                          |
      ]])

      -- "vert" character should still default to single-byte fillchars because of setcellwidths().
      command('set ambiwidth=single')
      screen:expect([[
        1                        |1                       |
        {13:^+--  2 lines: 2··········}|{13:+--  2 lines: 2·········}|
        4                        |4                       |
        {1:~                        }|{1:~                       }|
                                                          |
      ]])
    end)
  end)

  it("'shadafile' ('viminfofile')", function()
    local env = {
      XDG_DATA_HOME = 'Xtest-userdata',
      XDG_STATE_HOME = 'Xtest-userstate',
      XDG_CONFIG_HOME = 'Xtest-userconfig',
    }
    finally(function()
      command('set shadafile=NONE') -- Avoid writing shada file on exit
      rmdir('Xtest-userstate')
      os.remove('Xtest-foo')
    end)

    clear { args = {}, args_rm = { '-i' }, env = env }
    -- Default 'shadafile' is empty.
    -- This means use the default location. :help shada-file-name
    eq('', api.nvim_get_option_value('shadafile', {}))
    eq('', api.nvim_get_option_value('viminfofile', {}))
    -- Handles viminfo/viminfofile as alias for shada/shadafile.
    eq('\n  shadafile=', eval('execute("set shadafile?")'))
    eq('\n  shadafile=', eval('execute("set viminfofile?")'))
    eq("\n  shada=!,'100,<50,s10,h", eval('execute("set shada?")'))
    eq("\n  shada=!,'100,<50,s10,h", eval('execute("set viminfo?")'))

    -- Check that shada data (such as v:oldfiles) is saved/restored.
    command('edit Xtest-foo')
    command('write')
    local f = eval('fnamemodify(@%,":p")')
    assert(string.len(f) > 3)
    expect_exit(command, 'qall')
    clear { args = {}, args_rm = { '-i' }, env = env }
    eq({ f }, eval('v:oldfiles'))
  end)

  it("'packpath'", function()
    clear {
      args_rm = { 'runtimepath' },
    }
    -- Defaults to &runtimepath.
    eq(api.nvim_get_option_value('runtimepath', {}), api.nvim_get_option_value('packpath', {}))

    -- Does not follow modifications to runtimepath.
    command('set runtimepath+=foo')
    neq(api.nvim_get_option_value('runtimepath', {}), api.nvim_get_option_value('packpath', {}))
    command('set packpath+=foo')
    eq(api.nvim_get_option_value('runtimepath', {}), api.nvim_get_option_value('packpath', {}))
  end)

  it('v:progpath is set to the absolute path', function()
    clear()
    eq(eval("fnamemodify(v:progpath, ':p')"), eval('v:progpath'))
  end)

  describe('$NVIM_LOG_FILE', function()
    local xdgdir = 'Xtest-startup-xdg-logpath'
    local xdgstatedir = is_os('win') and xdgdir .. '/nvim-data' or xdgdir .. '/nvim'
    after_each(function()
      os.remove('Xtest-logpath')
      rmdir(xdgdir)
    end)

    it('is used if expansion succeeds', function()
      clear({ env = {
        NVIM_LOG_FILE = 'Xtest-logpath',
      } })
      eq('Xtest-logpath', eval('$NVIM_LOG_FILE'))
    end)
    it('defaults to stdpath("log")/log if empty', function()
      eq(true, mkdir(xdgdir) and mkdir(xdgstatedir))
      clear({
        env = {
          XDG_STATE_HOME = xdgdir,
          NVIM_LOG_FILE = '', -- Empty is invalid.
        },
      })
      eq(xdgstatedir .. '/log', string.gsub(eval('$NVIM_LOG_FILE'), '\\', '/'))
    end)
    it('defaults to stdpath("log")/log if invalid', function()
      eq(true, mkdir(xdgdir) and mkdir(xdgstatedir))
      clear({
        env = {
          XDG_STATE_HOME = xdgdir,
          NVIM_LOG_FILE = '.', -- Any directory is invalid.
        },
      })
      eq(xdgstatedir .. '/log', string.gsub(eval('$NVIM_LOG_FILE'), '\\', '/'))
    end)
  end)
end)

describe('XDG defaults', function()
  -- Need separate describe() blocks to not run clear() twice.
  -- Do not put before_each() here for the same reasons.

  after_each(function()
    check_close()
    os.remove(testlog)
  end)

  it("&runtimepath data-dir matches stdpath('data') #9910", function()
    clear()
    local rtp = eval('split(&runtimepath, ",")')
    local rv = {}
    local expected = (
      is_os('win') and { [[\nvim-data\site]], [[\nvim-data\site\after]] }
      or { '/nvim/site', '/nvim/site/after' }
    )

    for _, v in ipairs(rtp) do
      local m = string.match(v, [=[[/\]nvim[^/\]*[/\]site.*$]=])
      if m and not tbl_contains(rv, m) then
        table.insert(rv, m)
      end
    end
    eq(expected, rv)
  end)

  describe('with empty/broken environment', function()
    it('sets correct defaults', function()
      clear({
        env = {
          XDG_CONFIG_HOME = nil,
          XDG_DATA_HOME = nil,
          XDG_CACHE_HOME = nil,
          XDG_STATE_HOME = nil,
          XDG_RUNTIME_DIR = nil,
          XDG_CONFIG_DIRS = nil,
          XDG_DATA_DIRS = nil,
          LOCALAPPDATA = nil,
          HOMEPATH = nil,
          HOMEDRIVE = nil,
          HOME = nil,
          TEMP = nil,
          VIMRUNTIME = nil,
          USER = nil,
        },
      })

      eq('.', api.nvim_get_option_value('backupdir', {}))
      eq('.', api.nvim_get_option_value('viewdir', {}))
      eq('.', api.nvim_get_option_value('directory', {}))
      eq('.', api.nvim_get_option_value('undodir', {}))
      ok((fn.tempname()):len() > 4)
    end)
  end)

  local function vimruntime_and_libdir()
    local vimruntime = eval('$VIMRUNTIME')
    -- libdir is hard to calculate reliably across various ci platforms
    -- local libdir = string.gsub(vimruntime, "share/nvim/runtime$", "lib/nvim")
    local libdir = api.nvim__get_lib_dir()
    return vimruntime, libdir
  end

  local env_sep = is_os('win') and ';' or ':'
  local data_dir = is_os('win') and 'nvim-data' or 'nvim'
  local state_dir = is_os('win') and 'nvim-data' or 'nvim'
  local root_path = is_os('win') and 'C:' or ''

  describe('with too long XDG variables', function()
    before_each(function()
      clear({
        args_rm = { 'runtimepath' },
        env = {
          NVIM_LOG_FILE = testlog,
          XDG_CONFIG_HOME = (root_path .. ('/x'):rep(4096)),
          XDG_CONFIG_DIRS = (root_path .. ('/a'):rep(2048) .. env_sep .. root_path .. ('/b'):rep(
            2048
          ) .. (env_sep .. root_path .. '/c'):rep(512)),
          XDG_DATA_HOME = (root_path .. ('/X'):rep(4096)),
          XDG_RUNTIME_DIR = (root_path .. ('/X'):rep(4096)),
          XDG_STATE_HOME = (root_path .. ('/X'):rep(4096)),
          XDG_DATA_DIRS = (root_path .. ('/A'):rep(2048) .. env_sep .. root_path .. ('/B'):rep(
            2048
          ) .. (env_sep .. root_path .. '/C'):rep(512)),
        },
      })
    end)

    it('are correctly set', function()
      if not is_os('win') then
        assert_log('Failed to start server: no such file or directory: /X/X/X', testlog, 10)
      end

      local vimruntime, libdir = vimruntime_and_libdir()

      eq(
        (
          (
            root_path
            .. ('/x'):rep(4096)
            .. '/nvim'
            .. ','
            .. root_path
            .. ('/a'):rep(2048)
            .. '/nvim'
            .. ','
            .. root_path
            .. ('/b'):rep(2048)
            .. '/nvim'
            .. (',' .. root_path .. '/c/nvim')
            .. ','
            .. root_path
            .. ('/X'):rep(4096)
            .. '/'
            .. data_dir
            .. '/site'
            .. ','
            .. root_path
            .. ('/A'):rep(2048)
            .. '/nvim/site'
            .. ','
            .. root_path
            .. ('/B'):rep(2048)
            .. '/nvim/site'
            .. (',' .. root_path .. '/C/nvim/site')
            .. ','
            .. vimruntime
            .. ','
            .. libdir
            .. (',' .. root_path .. '/C/nvim/site/after')
            .. ','
            .. root_path
            .. ('/B'):rep(2048)
            .. '/nvim/site/after'
            .. ','
            .. root_path
            .. ('/A'):rep(2048)
            .. '/nvim/site/after'
            .. ','
            .. root_path
            .. ('/X'):rep(4096)
            .. '/'
            .. data_dir
            .. '/site/after'
            .. (',' .. root_path .. '/c/nvim/after')
            .. ','
            .. root_path
            .. ('/b'):rep(2048)
            .. '/nvim/after'
            .. ','
            .. root_path
            .. ('/a'):rep(2048)
            .. '/nvim/after'
            .. ','
            .. root_path
            .. ('/x'):rep(4096)
            .. '/nvim/after'
          ):gsub('\\', '/')
        ),
        (api.nvim_get_option_value('runtimepath', {})):gsub('\\', '/')
      )
      command('set runtimepath&')
      command('set backupdir&')
      command('set directory&')
      command('set undodir&')
      command('set viewdir&')
      eq(
        (
          (
            root_path
            .. ('/x'):rep(4096)
            .. '/nvim'
            .. ','
            .. root_path
            .. ('/a'):rep(2048)
            .. '/nvim'
            .. ','
            .. root_path
            .. ('/b'):rep(2048)
            .. '/nvim'
            .. (',' .. root_path .. '/c/nvim')
            .. ','
            .. root_path
            .. ('/X'):rep(4096)
            .. '/'
            .. data_dir
            .. '/site'
            .. ','
            .. root_path
            .. ('/A'):rep(2048)
            .. '/nvim/site'
            .. ','
            .. root_path
            .. ('/B'):rep(2048)
            .. '/nvim/site'
            .. (',' .. root_path .. '/C/nvim/site')
            .. ','
            .. vimruntime
            .. ','
            .. libdir
            .. (',' .. root_path .. '/C/nvim/site/after')
            .. ','
            .. root_path
            .. ('/B'):rep(2048)
            .. '/nvim/site/after'
            .. ','
            .. root_path
            .. ('/A'):rep(2048)
            .. '/nvim/site/after'
            .. ','
            .. root_path
            .. ('/X'):rep(4096)
            .. '/'
            .. data_dir
            .. '/site/after'
            .. (',' .. root_path .. '/c/nvim/after')
            .. ','
            .. root_path
            .. ('/b'):rep(2048)
            .. '/nvim/after'
            .. ','
            .. root_path
            .. ('/a'):rep(2048)
            .. '/nvim/after'
            .. ','
            .. root_path
            .. ('/x'):rep(4096)
            .. '/nvim/after'
          ):gsub('\\', '/')
        ),
        (api.nvim_get_option_value('runtimepath', {})):gsub('\\', '/')
      )
      eq(
        '.,' .. root_path .. ('/X'):rep(4096) .. '/' .. state_dir .. '/backup//',
        (api.nvim_get_option_value('backupdir', {}):gsub('\\', '/'))
      )
      eq(
        root_path .. ('/X'):rep(4096) .. '/' .. state_dir .. '/swap//',
        (api.nvim_get_option_value('directory', {})):gsub('\\', '/')
      )
      eq(
        root_path .. ('/X'):rep(4096) .. '/' .. state_dir .. '/undo//',
        (api.nvim_get_option_value('undodir', {})):gsub('\\', '/')
      )
      eq(
        root_path .. ('/X'):rep(4096) .. '/' .. state_dir .. '/view//',
        (api.nvim_get_option_value('viewdir', {})):gsub('\\', '/')
      )
    end)
  end)

  describe('with XDG variables that can be expanded', function()
    before_each(function()
      clear({
        args_rm = { 'runtimepath' },
        env = {
          NVIM_LOG_FILE = testlog,
          XDG_CONFIG_HOME = '$XDG_DATA_HOME',
          XDG_CONFIG_DIRS = '$XDG_DATA_DIRS',
          XDG_DATA_HOME = '$XDG_CONFIG_HOME',
          XDG_RUNTIME_DIR = '$XDG_RUNTIME_DIR',
          XDG_STATE_HOME = '$XDG_CONFIG_HOME',
          XDG_DATA_DIRS = '$XDG_CONFIG_DIRS',
        },
      })
    end)

    after_each(function()
      command('set shadafile=NONE') -- Avoid writing shada file on exit
    end)

    it('are not expanded', function()
      if not is_os('win') then
        assert_log(
          'Failed to start server: no such file or directory: %$XDG_RUNTIME_DIR%/',
          testlog,
          10
        )
      end

      local vimruntime, libdir = vimruntime_and_libdir()
      eq(
        (
          (
            '$XDG_DATA_HOME/nvim'
            .. ',$XDG_DATA_DIRS/nvim'
            .. ',$XDG_CONFIG_HOME/'
            .. data_dir
            .. '/site'
            .. ',$XDG_CONFIG_DIRS/nvim/site'
            .. ','
            .. vimruntime
            .. ','
            .. libdir
            .. ',$XDG_CONFIG_DIRS/nvim/site/after'
            .. ',$XDG_CONFIG_HOME/'
            .. data_dir
            .. '/site/after'
            .. ',$XDG_DATA_DIRS/nvim/after'
            .. ',$XDG_DATA_HOME/nvim/after'
          ):gsub('\\', '/')
        ),
        (api.nvim_get_option_value('runtimepath', {})):gsub('\\', '/')
      )
      command('set runtimepath&')
      command('set backupdir&')
      command('set directory&')
      command('set undodir&')
      command('set viewdir&')
      eq(
        (
          (
            '$XDG_DATA_HOME/nvim'
            .. ',$XDG_DATA_DIRS/nvim'
            .. ',$XDG_CONFIG_HOME/'
            .. data_dir
            .. '/site'
            .. ',$XDG_CONFIG_DIRS/nvim/site'
            .. ','
            .. vimruntime
            .. ','
            .. libdir
            .. ',$XDG_CONFIG_DIRS/nvim/site/after'
            .. ',$XDG_CONFIG_HOME/'
            .. data_dir
            .. '/site/after'
            .. ',$XDG_DATA_DIRS/nvim/after'
            .. ',$XDG_DATA_HOME/nvim/after'
          ):gsub('\\', '/')
        ),
        (api.nvim_get_option_value('runtimepath', {})):gsub('\\', '/')
      )
      eq(
        ('.,$XDG_CONFIG_HOME/' .. state_dir .. '/backup//'),
        api.nvim_get_option_value('backupdir', {}):gsub('\\', '/')
      )
      eq(
        ('$XDG_CONFIG_HOME/' .. state_dir .. '/swap//'),
        api.nvim_get_option_value('directory', {}):gsub('\\', '/')
      )
      eq(
        ('$XDG_CONFIG_HOME/' .. state_dir .. '/undo//'),
        api.nvim_get_option_value('undodir', {}):gsub('\\', '/')
      )
      eq(
        ('$XDG_CONFIG_HOME/' .. state_dir .. '/view//'),
        api.nvim_get_option_value('viewdir', {}):gsub('\\', '/')
      )
      command('set all&')
      eq(
        (
          '$XDG_DATA_HOME/nvim'
          .. ',$XDG_DATA_DIRS/nvim'
          .. ',$XDG_CONFIG_HOME/'
          .. data_dir
          .. '/site'
          .. ',$XDG_CONFIG_DIRS/nvim/site'
          .. ','
          .. vimruntime
          .. ','
          .. libdir
          .. ',$XDG_CONFIG_DIRS/nvim/site/after'
          .. ',$XDG_CONFIG_HOME/'
          .. data_dir
          .. '/site/after'
          .. ',$XDG_DATA_DIRS/nvim/after'
          .. ',$XDG_DATA_HOME/nvim/after'
        ):gsub('\\', '/'),
        (api.nvim_get_option_value('runtimepath', {})):gsub('\\', '/')
      )
      eq(
        ('.,$XDG_CONFIG_HOME/' .. state_dir .. '/backup//'),
        api.nvim_get_option_value('backupdir', {}):gsub('\\', '/')
      )
      eq(
        ('$XDG_CONFIG_HOME/' .. state_dir .. '/swap//'),
        api.nvim_get_option_value('directory', {}):gsub('\\', '/')
      )
      eq(
        ('$XDG_CONFIG_HOME/' .. state_dir .. '/undo//'),
        api.nvim_get_option_value('undodir', {}):gsub('\\', '/')
      )
      eq(
        ('$XDG_CONFIG_HOME/' .. state_dir .. '/view//'),
        api.nvim_get_option_value('viewdir', {}):gsub('\\', '/')
      )
      eq(nil, (fn.tempname()):match('XDG_RUNTIME_DIR'))
    end)
  end)

  describe('with commas', function()
    before_each(function()
      clear({
        args_rm = { 'runtimepath' },
        env = {
          XDG_CONFIG_HOME = ', , ,',
          XDG_CONFIG_DIRS = ',-,-,' .. env_sep .. '-,-,-',
          XDG_DATA_HOME = ',=,=,',
          XDG_STATE_HOME = ',=,=,',
          XDG_DATA_DIRS = ',≡,≡,' .. env_sep .. '≡,≡,≡',
        },
      })
    end)

    it('are escaped properly', function()
      local vimruntime, libdir = vimruntime_and_libdir()
      local path_sep = is_os('win') and '\\' or '/'
      eq(
        (
          '\\, \\, \\,'
          .. path_sep
          .. 'nvim'
          .. ',\\,-\\,-\\,'
          .. path_sep
          .. 'nvim'
          .. ',-\\,-\\,-'
          .. path_sep
          .. 'nvim'
          .. ',\\,=\\,=\\,'
          .. path_sep
          .. data_dir
          .. path_sep
          .. 'site'
          .. ',\\,≡\\,≡\\,'
          .. path_sep
          .. 'nvim'
          .. path_sep
          .. 'site'
          .. ',≡\\,≡\\,≡'
          .. path_sep
          .. 'nvim'
          .. path_sep
          .. 'site'
          .. ','
          .. vimruntime
          .. ','
          .. libdir
          .. ',≡\\,≡\\,≡'
          .. path_sep
          .. 'nvim'
          .. path_sep
          .. 'site'
          .. path_sep
          .. 'after'
          .. ',\\,≡\\,≡\\,'
          .. path_sep
          .. 'nvim'
          .. path_sep
          .. 'site'
          .. path_sep
          .. 'after'
          .. ',\\,=\\,=\\,'
          .. path_sep
          .. data_dir
          .. path_sep
          .. 'site'
          .. path_sep
          .. 'after'
          .. ',-\\,-\\,-'
          .. path_sep
          .. 'nvim'
          .. path_sep
          .. 'after'
          .. ',\\,-\\,-\\,'
          .. path_sep
          .. 'nvim'
          .. path_sep
          .. 'after'
          .. ',\\, \\, \\,'
          .. path_sep
          .. 'nvim'
          .. path_sep
          .. 'after'
        ),
        api.nvim_get_option_value('runtimepath', {})
      )
      command('set runtimepath&')
      command('set backupdir&')
      command('set directory&')
      command('set undodir&')
      command('set viewdir&')
      eq(
        (
          '\\, \\, \\,'
          .. path_sep
          .. 'nvim'
          .. ',\\,-\\,-\\,'
          .. path_sep
          .. 'nvim'
          .. ',-\\,-\\,-'
          .. path_sep
          .. 'nvim'
          .. ',\\,=\\,=\\,'
          .. path_sep
          .. ''
          .. data_dir
          .. ''
          .. path_sep
          .. 'site'
          .. ',\\,≡\\,≡\\,'
          .. path_sep
          .. 'nvim'
          .. path_sep
          .. 'site'
          .. ',≡\\,≡\\,≡'
          .. path_sep
          .. 'nvim'
          .. path_sep
          .. 'site'
          .. ','
          .. vimruntime
          .. ','
          .. libdir
          .. ',≡\\,≡\\,≡'
          .. path_sep
          .. 'nvim'
          .. path_sep
          .. 'site'
          .. path_sep
          .. 'after'
          .. ',\\,≡\\,≡\\,'
          .. path_sep
          .. 'nvim'
          .. path_sep
          .. 'site'
          .. path_sep
          .. 'after'
          .. ',\\,=\\,=\\,'
          .. path_sep
          .. ''
          .. data_dir
          .. ''
          .. path_sep
          .. 'site'
          .. path_sep
          .. 'after'
          .. ',-\\,-\\,-'
          .. path_sep
          .. 'nvim'
          .. path_sep
          .. 'after'
          .. ',\\,-\\,-\\,'
          .. path_sep
          .. 'nvim'
          .. path_sep
          .. 'after'
          .. ',\\, \\, \\,'
          .. path_sep
          .. 'nvim'
          .. path_sep
          .. 'after'
        ),
        api.nvim_get_option_value('runtimepath', {})
      )
      eq(
        '.,\\,=\\,=\\,' .. path_sep .. state_dir .. '' .. path_sep .. 'backup' .. (path_sep):rep(2),
        api.nvim_get_option_value('backupdir', {})
      )
      eq(
        '\\,=\\,=\\,'
          .. path_sep
          .. ''
          .. state_dir
          .. ''
          .. path_sep
          .. 'swap'
          .. (path_sep):rep(2),
        api.nvim_get_option_value('directory', {})
      )
      eq(
        '\\,=\\,=\\,'
          .. path_sep
          .. ''
          .. state_dir
          .. ''
          .. path_sep
          .. 'undo'
          .. (path_sep):rep(2),
        api.nvim_get_option_value('undodir', {})
      )
      eq(
        '\\,=\\,=\\,'
          .. path_sep
          .. ''
          .. state_dir
          .. ''
          .. path_sep
          .. 'view'
          .. (path_sep):rep(2),
        api.nvim_get_option_value('viewdir', {})
      )
    end)
  end)
end)

describe('stdpath()', function()
  after_each(function()
    check_close()
    os.remove(testlog)
  end)

  -- Windows appends 'nvim-data' instead of just 'nvim' to prevent collisions
  -- due to XDG_CONFIG_HOME, XDG_DATA_HOME and XDG_STATE_HOME being the same.
  local function maybe_data(name)
    return is_os('win') and name .. '-data' or name
  end

  local datadir = maybe_data('nvim')
  local statedir = maybe_data('nvim')
  local env_sep = is_os('win') and ';' or ':'

  it('acceptance', function()
    clear() -- Do not explicitly set any env vars.

    eq('nvim', fn.fnamemodify(fn.stdpath('cache'), ':t'))
    eq('nvim', fn.fnamemodify(fn.stdpath('config'), ':t'))
    eq(datadir, fn.fnamemodify(fn.stdpath('data'), ':t'))
    eq(statedir, fn.fnamemodify(fn.stdpath('state'), ':t'))
    eq('table', type(fn.stdpath('config_dirs')))
    eq('table', type(fn.stdpath('data_dirs')))
    eq('string', type(fn.stdpath('run')))
    assert_alive() -- Check for crash. #8393
  end)

  it('reacts to $NVIM_APPNAME', function()
    local appname = 'NVIM_APPNAME_TEST' .. ('_'):rep(106)
    clear({ env = { NVIM_APPNAME = appname, NVIM_LOG_FILE = testlog } })
    eq(appname, fn.fnamemodify(fn.stdpath('config'), ':t'))
    eq(appname, fn.fnamemodify(fn.stdpath('cache'), ':t'))
    eq(maybe_data(appname), fn.fnamemodify(fn.stdpath('log'), ':t'))
    eq(maybe_data(appname), fn.fnamemodify(fn.stdpath('data'), ':t'))
    eq(maybe_data(appname), fn.fnamemodify(fn.stdpath('state'), ':t'))
    -- config_dirs and data_dirs are empty on windows, so don't check them on
    -- that platform
    if not is_os('win') then
      eq(appname, fn.fnamemodify(fn.stdpath('config_dirs')[1], ':t'))
      eq(appname, fn.fnamemodify(fn.stdpath('data_dirs')[1], ':t'))
    end
    assert_alive() -- Check for crash. #8393

    -- Check that Nvim rejects invalid APPNAMEs
    -- Call jobstart() and jobwait() in the same RPC request to reduce flakiness.
    local function test_appname(testAppname, expected_exitcode)
      local lua_code = string.format(
        [[
        local child = vim.fn.jobstart({ vim.v.progpath, '--clean', '--headless', '+qall!' }, { env = { NVIM_APPNAME = %q } })
        return vim.fn.jobwait({ child }, %d)[1]
      ]],
        alter_slashes(testAppname),
        3000
      )
      eq(expected_exitcode, exec_lua(lua_code))
    end
    -- Invalid appnames:
    test_appname('a/../b', 1)
    test_appname('../a', 1)
    test_appname('a/..', 1)
    test_appname('..', 1)
    test_appname('.', 1)
    test_appname('/', 1)
    test_appname(is_os('win') and 'C:/a/b' or '/a/b', 1)
    -- Valid appnames:
    test_appname('a/b', 0)
    test_appname('a/b\\c', 0)
    if not is_os('win') then
      assert_log('Failed to start server: no such file or directory:', testlog)
    end
  end)

  describe('returns a String', function()
    describe('with "config"', function()
      it('knows XDG_CONFIG_HOME', function()
        clear({
          env = {
            XDG_CONFIG_HOME = alter_slashes('/home/docwhat/.config'),
          },
        })
        eq(alter_slashes('/home/docwhat/.config/nvim'), fn.stdpath('config'))
      end)

      it('handles changes during runtime', function()
        clear({ env = {
          XDG_CONFIG_HOME = alter_slashes('/home/original'),
        } })
        eq(alter_slashes('/home/original/nvim'), fn.stdpath('config'))
        command("let $XDG_CONFIG_HOME='" .. alter_slashes('/home/new') .. "'")
        eq(alter_slashes('/home/new/nvim'), fn.stdpath('config'))
      end)

      it("doesn't expand $VARIABLES", function()
        clear({
          env = {
            XDG_CONFIG_HOME = '$VARIABLES',
            VARIABLES = 'this-should-not-happen',
          },
        })
        eq(alter_slashes('$VARIABLES/nvim'), fn.stdpath('config'))
      end)

      it("doesn't expand ~/", function()
        clear({ env = {
          XDG_CONFIG_HOME = alter_slashes('~/frobnitz'),
        } })
        eq(alter_slashes('~/frobnitz/nvim'), fn.stdpath('config'))
      end)
    end)

    describe('with "data"', function()
      it('knows XDG_DATA_HOME', function()
        clear({ env = {
          XDG_DATA_HOME = alter_slashes('/home/docwhat/.local'),
        } })
        eq(alter_slashes('/home/docwhat/.local/' .. datadir), fn.stdpath('data'))
      end)

      it('handles changes during runtime', function()
        clear({ env = {
          XDG_DATA_HOME = alter_slashes('/home/original'),
        } })
        eq(alter_slashes('/home/original/' .. datadir), fn.stdpath('data'))
        command("let $XDG_DATA_HOME='" .. alter_slashes('/home/new') .. "'")
        eq(alter_slashes('/home/new/' .. datadir), fn.stdpath('data'))
      end)

      it("doesn't expand $VARIABLES", function()
        clear({
          env = {
            XDG_DATA_HOME = '$VARIABLES',
            VARIABLES = 'this-should-not-happen',
          },
        })
        eq(alter_slashes('$VARIABLES/' .. datadir), fn.stdpath('data'))
      end)

      it("doesn't expand ~/", function()
        clear({ env = {
          XDG_DATA_HOME = alter_slashes('~/frobnitz'),
        } })
        eq(alter_slashes('~/frobnitz/' .. datadir), fn.stdpath('data'))
      end)
    end)

    describe('with "state"', function()
      it('knows XDG_STATE_HOME', function()
        clear({
          env = {
            XDG_STATE_HOME = alter_slashes('/home/docwhat/.local'),
          },
        })
        eq(alter_slashes('/home/docwhat/.local/' .. statedir), fn.stdpath('state'))
      end)

      it('handles changes during runtime', function()
        clear({ env = {
          XDG_STATE_HOME = alter_slashes('/home/original'),
        } })
        eq(alter_slashes('/home/original/' .. statedir), fn.stdpath('state'))
        command("let $XDG_STATE_HOME='" .. alter_slashes('/home/new') .. "'")
        eq(alter_slashes('/home/new/' .. statedir), fn.stdpath('state'))
      end)

      it("doesn't expand $VARIABLES", function()
        clear({
          env = {
            XDG_STATE_HOME = '$VARIABLES',
            VARIABLES = 'this-should-not-happen',
          },
        })
        eq(alter_slashes('$VARIABLES/' .. statedir), fn.stdpath('state'))
      end)

      it("doesn't expand ~/", function()
        clear({ env = {
          XDG_STATE_HOME = alter_slashes('~/frobnitz'),
        } })
        eq(alter_slashes('~/frobnitz/' .. statedir), fn.stdpath('state'))
      end)
    end)

    describe('with "cache"', function()
      it('knows XDG_CACHE_HOME', function()
        clear({
          env = {
            XDG_CACHE_HOME = alter_slashes('/home/docwhat/.cache'),
          },
        })
        eq(alter_slashes('/home/docwhat/.cache/nvim'), fn.stdpath('cache'))
      end)

      it('handles changes during runtime', function()
        clear({ env = {
          XDG_CACHE_HOME = alter_slashes('/home/original'),
        } })
        eq(alter_slashes('/home/original/nvim'), fn.stdpath('cache'))
        command("let $XDG_CACHE_HOME='" .. alter_slashes('/home/new') .. "'")
        eq(alter_slashes('/home/new/nvim'), fn.stdpath('cache'))
      end)

      it("doesn't expand $VARIABLES", function()
        clear({
          env = {
            XDG_CACHE_HOME = '$VARIABLES',
            VARIABLES = 'this-should-not-happen',
          },
        })
        eq(alter_slashes('$VARIABLES/nvim'), fn.stdpath('cache'))
      end)

      it("doesn't expand ~/", function()
        clear({ env = {
          XDG_CACHE_HOME = alter_slashes('~/frobnitz'),
        } })
        eq(alter_slashes('~/frobnitz/nvim'), fn.stdpath('cache'))
      end)
    end)
  end)

  describe('returns a List', function()
    -- Some OS specific variables the system would have set.
    local function base_env()
      if is_os('win') then
        return {
          HOME = 'C:\\Users\\docwhat', -- technically, is not a usual PATH
          HOMEDRIVE = 'C:',
          HOMEPATH = '\\Users\\docwhat',
          LOCALAPPDATA = 'C:\\Users\\docwhat\\AppData\\Local',
          TEMP = 'C:\\Users\\docwhat\\AppData\\Local\\Temp',
          TMPDIR = 'C:\\Users\\docwhat\\AppData\\Local\\Temp',
          TMP = 'C:\\Users\\docwhat\\AppData\\Local\\Temp',
        }
      else
        return {
          HOME = '/home/docwhat',
          HOMEDRIVE = 'HOMEDRIVE-should-be-ignored',
          HOMEPATH = 'HOMEPATH-should-be-ignored',
          LOCALAPPDATA = 'LOCALAPPDATA-should-be-ignored',
          TEMP = 'TEMP-should-be-ignored',
          TMPDIR = 'TMPDIR-should-be-ignored',
          TMP = 'TMP-should-be-ignored',
        }
      end
    end

    local function set_paths_via_system(var_name, paths)
      local env = base_env()
      env[var_name] = table.concat(paths, env_sep)
      clear({ env = env })
    end

    local function set_paths_at_runtime(var_name, paths)
      clear({ env = base_env() })
      api.nvim_set_var('env_val', table.concat(paths, env_sep))
      command(('let $%s=g:env_val'):format(var_name))
    end

    local function behaves_like_dir_list_env(msg, stdpath_arg, env_var_name, paths, expected_paths)
      describe(msg, function()
        it('set via system', function()
          set_paths_via_system(env_var_name, paths)
          eq(expected_paths, fn.stdpath(stdpath_arg))
        end)

        it('set at runtime', function()
          set_paths_at_runtime(env_var_name, paths)
          eq(expected_paths, fn.stdpath(stdpath_arg))
        end)
      end)
    end

    describe('with "config_dirs"', function()
      behaves_like_dir_list_env(
        'handles XDG_CONFIG_DIRS with one path',
        'config_dirs',
        'XDG_CONFIG_DIRS',
        {
          alter_slashes('/home/docwhat/.config'),
        },
        {
          alter_slashes('/home/docwhat/.config/nvim'),
        }
      )

      behaves_like_dir_list_env(
        'handles XDG_CONFIG_DIRS with two paths',
        'config_dirs',
        'XDG_CONFIG_DIRS',
        {
          alter_slashes('/home/docwhat/.config'),
          alter_slashes('/etc/config'),
        },
        {
          alter_slashes('/home/docwhat/.config/nvim'),
          alter_slashes('/etc/config/nvim'),
        }
      )

      behaves_like_dir_list_env(
        "doesn't expand $VAR and $IBLES",
        'config_dirs',
        'XDG_CONFIG_DIRS',
        { '$HOME', '$TMP' },
        {
          alter_slashes('$HOME/nvim'),
          alter_slashes('$TMP/nvim'),
        }
      )

      behaves_like_dir_list_env("doesn't expand ~/", 'config_dirs', 'XDG_CONFIG_DIRS', {
        alter_slashes('~/.oldconfig'),
        alter_slashes('~/.olderconfig'),
      }, {
        alter_slashes('~/.oldconfig/nvim'),
        alter_slashes('~/.olderconfig/nvim'),
      })
    end)

    describe('with "data_dirs"', function()
      behaves_like_dir_list_env('knows XDG_DATA_DIRS with one path', 'data_dirs', 'XDG_DATA_DIRS', {
        alter_slashes('/home/docwhat/.data'),
      }, {
        alter_slashes('/home/docwhat/.data/nvim'),
      })

      behaves_like_dir_list_env(
        'knows XDG_DATA_DIRS with two paths',
        'data_dirs',
        'XDG_DATA_DIRS',
        {
          alter_slashes('/home/docwhat/.data'),
          alter_slashes('/etc/local'),
        },
        {
          alter_slashes('/home/docwhat/.data/nvim'),
          alter_slashes('/etc/local/nvim'),
        }
      )

      behaves_like_dir_list_env(
        "doesn't expand $VAR and $IBLES",
        'data_dirs',
        'XDG_DATA_DIRS',
        { '$HOME', '$TMP' },
        {
          alter_slashes('$HOME/nvim'),
          alter_slashes('$TMP/nvim'),
        }
      )

      behaves_like_dir_list_env("doesn't expand ~/", 'data_dirs', 'XDG_DATA_DIRS', {
        alter_slashes('~/.oldconfig'),
        alter_slashes('~/.olderconfig'),
      }, {
        alter_slashes('~/.oldconfig/nvim'),
        alter_slashes('~/.olderconfig/nvim'),
      })
    end)
  end)

  describe('errors', function()
    before_each(clear)

    it('on unknown strings', function()
      eq('Vim(call):E6100: "capybara" is not a valid stdpath', exc_exec('call stdpath("capybara")'))
      eq('Vim(call):E6100: "" is not a valid stdpath', exc_exec('call stdpath("")'))
      eq('Vim(call):E6100: "23" is not a valid stdpath', exc_exec('call stdpath(23)'))
    end)

    it('on non-strings', function()
      eq('Vim(call):E731: Using a Dictionary as a String', exc_exec('call stdpath({"eris": 23})'))
      eq('Vim(call):E730: Using a List as a String', exc_exec('call stdpath([23])'))
    end)
  end)
end)

describe('autocommands', function()
  it('closes terminal with default shell on success', function()
    clear()
    api.nvim_set_option_value('shell', n.testprg('shell-test'), {})
    command('set shellcmdflag=EXIT shellredir= shellpipe= shellquote= shellxquote=')

    -- Should not block other events
    command('let g:n=0')
    command('au BufEnter * let g:n = g:n + 1')

    command('terminal')
    eq(1, eval('get(g:, "n", 0)'))

    t.retry(nil, 1000, function()
      neq('terminal', api.nvim_get_option_value('buftype', { buf = 0 }))
      eq(2, eval('get(g:, "n", 0)'))
    end)
  end)
end)