Before:
  silent! cd /testplugin/test
  silent file top/middle/bottom/dummy.txt

  " Return the base temp directory safely. Vim 9.0+ uses a flat tempname()
  " format (e.g. C:\tmp\VIMXXXXXXXX) instead of C:\tmp\VIMxxx\NNN, so
  " fnamemodify(tempname(), ':h:h') may resolve to a filesystem root.
  function! GetTempBase() abort
    let l:base = fnamemodify(tempname(), ':h:h')

    if l:base is# fnamemodify(l:base, ':h')
      return fnamemodify(tempname(), ':h')
    endif

    return l:base
  endfunction

  function! CheckTempFile(filename) abort
    " Check every part of the temporary filename, except the random part.
    AssertEqual fnamemodify(tempname(), ':h'), fnamemodify(a:filename, ':h:h')
    AssertEqual 'dummy.txt', fnamemodify(a:filename, ':t')
  endfunction

  runtime autoload/ale/command.vim

  function! ale#command#CreateTempFile(buffer, temporary_file, input) abort
    return !empty(a:temporary_file)
  endfunction

After:
  unlet! g:result
  unlet! g:match

  delfunction CheckTempFile
  delfunction GetTempBase

  runtime autoload/ale/util.vim
  runtime autoload/ale/command.vim

Execute(FormatCommand should do nothing to basic command strings):
  AssertEqual
  \ ['', 'awesome-linter do something', 0],
  \ ale#command#FormatCommand(bufnr('%'), '', 'awesome-linter do something', 0, v:null, v:null, [])

Execute(FormatCommand should handle %%, and ignore other percents):
  AssertEqual
  \ ['', '% %%d %%f %x %', 0],
  \ ale#command#FormatCommand(bufnr('%'), '', '%% %%%d %%%f %x %', 0, v:null, v:null, [])

Execute(FormatCommand should convert %s to the current filename):
  AssertEqual
  \ [
  \   '',
  \   'foo ' . ale#Escape(expand('%:p')) . ' bar ' . ale#Escape(expand('%:p')),
  \   0,
  \ ],
  \ ale#command#FormatCommand(bufnr('%'), '', 'foo %s bar %s', 0, v:null, v:null, [])

Execute(FormatCommand should convert %t to a new temporary filename):
  let g:result = ale#command#FormatCommand(bufnr('%'), '', 'foo %t bar %t', 0, v:null, v:null, [])

  call CheckTempFile(g:result[0])

  let g:match = matchlist(g:result[1], '\v^foo (.*) bar (.*)$')

  Assert !empty(g:match), 'No match found! Result was: ' . g:result[1]
  " The first item of the result should be a temporary filename, and it should
  " be the same as the escaped name in the command string.
  AssertEqual ale#Escape(g:result[0]), g:match[1]
  " The two temporary filenames formatted in should be the same.
  AssertEqual g:match[1], g:match[2]

Execute(FormatCommand should normalize mixed Windows temporary paths):
  if has('win32')
    function! ale#util#Tempname() abort
      return 'D:/Personal/Temp/V6UA83E.tmp'
    endfunction

    let g:result = ale#command#FormatCommand(bufnr('%'), '', '%t', 0, v:null, v:null, [])

    AssertEqual 'D:\Personal\Temp\V6UA83E.tmp\dummy.txt', g:result[0]
    AssertEqual ale#Escape(g:result[0]), g:result[1]
  endif

Execute(FormatCommand should not convert %t to a new temporary filename when the input is given as v:false):
  let g:result = ale#command#FormatCommand(bufnr('%'), '', 'foo %t bar %t', 0, v:false, v:null, [])

  AssertEqual ['', 'foo %t bar %t', 0], g:result

Execute(FormatCommand should signal that files are created when temporary files are needed):
  AssertEqual
  \ 1,
  \ ale#command#FormatCommand(bufnr('%'), '', 'foo %t', 0, v:null, v:null, [])[2]

  AssertEqual
  \ 0,
  \ ale#command#FormatCommand(bufnr('%'), '', 'foo %s', 0, v:null, v:null, [])[2]

Execute(FormatCommand should let you combine %s and %t):
  let g:result = ale#command#FormatCommand(bufnr('%'), '', 'foo %t bar %s', 0, v:null, v:null, [])

  call CheckTempFile(g:result[0])

  let g:match = matchlist(g:result[1], '\v^foo (.*) bar (.*)$')

  Assert !empty(g:match), 'No match found! Result was: ' . g:result[1]
  " The first item of the result should be a temporary filename, and it should
  " be the same as the escaped name in the command string.
  AssertEqual ale#Escape(g:result[0]), g:match[1]
  " The second item should be equal to the original filename.
  AssertEqual ale#Escape(expand('%:p')), g:match[2]

Execute(FormatCommand should replace %e with the escaped executable):
  if has('win32')
    AssertEqual
    \ ['', 'foo foo', 0],
    \ ale#command#FormatCommand(bufnr('%'), 'foo', '%e %e', 0, v:null, v:null, [])
    AssertEqual
    \ ['', '"foo bar"', 0],
    \ ale#command#FormatCommand(bufnr('%'), 'foo bar', '%e', 0, v:null, v:null, [])
    AssertEqual
    \ ['', '%e %e', 0],
    \ ale#command#FormatCommand(bufnr('%'), '', '%e %e', 0, v:null, v:null, [])
  else
    AssertEqual
    \ ['', '''foo'' ''foo''', 0],
    \ ale#command#FormatCommand(bufnr('%'), 'foo', '%e %e', 0, v:null, v:null, [])
    AssertEqual
    \ ['', '''foo bar''', 0],
    \ ale#command#FormatCommand(bufnr('%'), 'foo bar', '%e', 0, v:null, v:null, [])
    AssertEqual
    \ ['', '%e %e', 0],
    \ ale#command#FormatCommand(bufnr('%'), '', '%e %e', 0, v:null, v:null, [])
  endif

Execute(EscapeCommandPart should escape all percent signs):
  AssertEqual '%%s %%t %%%% %%s %%t %%%%', ale#engine#EscapeCommandPart('%s %t %% %s %t %%')

Execute(EscapeCommandPart should pipe in temporary files appropriately):
  let g:result = ale#command#FormatCommand(bufnr('%'), '', 'foo bar', 1, v:null, v:null, [])

  call CheckTempFile(g:result[0])

  let g:match = matchlist(g:result[1], '\v^foo bar \< (.*)$')
  Assert !empty(g:match), 'No match found! Result was: ' . g:result[1]
  AssertEqual ale#Escape(g:result[0]), g:match[1]

  let g:result = ale#command#FormatCommand(bufnr('%'), '', 'foo bar %t', 1, v:null, v:null, [])

  call CheckTempFile(g:result[0])

  let g:match = matchlist(g:result[1], '\v^foo bar (.*)$')
  Assert !empty(g:match), 'No match found! Result was: ' . g:result[1]
  AssertEqual ale#Escape(g:result[0]), g:match[1]

Execute(FormatCommand should apply filename modifiers to the current file):
  AssertEqual
  \ ale#Escape(expand('%:p:h'))
  \   . ' ' . ale#Escape('dummy.txt')
  \   . ' ' . ale#Escape(expand('%:p:h:t'))
  \   . ' ' . ale#Escape('txt')
  \   . ' ' . ale#Escape(expand('%:p:r')),
  \ ale#command#FormatCommand(bufnr(''), '', '%s:h %s:t %s:h:t %s:e %s:r', 0, v:null, v:null, [])[1]

Execute(FormatCommand should apply filename modifiers to the temporary file):
  let g:result = ale#command#FormatCommand(bufnr(''), '', '%t:h %t:t %t:h:t %t:e %t:r', 0, v:null, v:null, [])

  AssertEqual
  \ ale#Escape(fnamemodify(g:result[0], ':h'))
  \   . ' ' . ale#Escape('dummy.txt')
  \   . ' ' . ale#Escape(fnamemodify(g:result[0], ':h:t'))
  \   . ' ' . ale#Escape('txt')
  \   . ' ' . ale#Escape(fnamemodify(g:result[0], ':r')),
  \ g:result[1]

Execute(FormatCommand should apply filename mappings the current file):
  let g:result = ale#command#FormatCommand(bufnr('%'), '', '%s', 0, v:null, v:null, [
  \ [expand('%:p:h'), '/foo/bar'],
  \])

  Assert g:result[1] =~# '/foo/bar'

Execute(FormatCommand should apply filename mappings to temporary files):
  let g:result = ale#command#FormatCommand(bufnr('%'), '', '%t', 0, v:null, v:null, [
  \ [GetTempBase(), '/foo/bar']
  \])

  Assert g:result[1] =~# '/foo/bar'

Execute(FormatCommand should apply filename modifiers to mapped filenames):
  let g:mapped_filename = '/foo/bar/dummy.txt'
  let g:result = ale#command#FormatCommand(bufnr('%'), '', '%s:h', 0, v:null, v:null, [
  \ [expand('%:p'), g:mapped_filename],
  \])

  AssertEqual ale#Escape('/foo/bar'), g:result[1]

  " Compute the number of :h modifiers needed to get from the temp file
  " (tempname()/dummy.txt) back to GetTempBase(). This varies by platform:
  " NeoVim uses nested temp dirs, Vim 9.x Windows uses flat ones.
  let g:tbase = GetTempBase()
  let g:tname = ale#util#Tempname()
  let g:rel = substitute(g:tname, '^\V' . escape(g:tbase, '\'), '', '')
  " +1 for dummy.txt appended by TemporaryFilename
  let g:depth = len(split(g:rel, '[/\\]')) + 1
  let g:modifiers = repeat(':h', g:depth)

  let g:result = ale#command#FormatCommand(bufnr('%'), '', '%t' . g:modifiers, 0, v:null, v:null, [
  \ [GetTempBase(), '/foo/bar']
  \])

  AssertEqual ale#Escape('/foo/bar'), g:result[1]

Execute(FormatCommand should apply regular cwd paths):
  AssertEqual
  \ 'cd ' . (has('unix') ? '' : '/d ') . ale#Escape('/foo /bar') . ' && abc',
  \ ale#command#FormatCommand(bufnr('%'), '', 'abc', 0, v:null, '/foo /bar', [])[1]
  \
Execute(FormatCommand should apply cwd substitution and formatting):
  call ale#test#SetFilename('foo.txt')

  AssertEqual
  \ 'cd ' . (has('unix') ? '' : '/d ') . ale#Escape(getcwd()) . ' && abc',
  \ ale#command#FormatCommand(bufnr('%'), '', 'abc', 0, v:null, '%s:h', [])[1]