Make temporary file detection work on just about all platforms

autoload/ale/engine.vim

@@ -375,7 +375,7 @@ function! ale#engine#FixLocList(buffer, linter_name, loclist) abort
         \}
 
         if has_key(l:old_item, 'filename')
-        \&& l:old_item.filename[:len(s:temp_dir) - 1] isnot# s:temp_dir
+        \&& !ale#path#IsTempName(l:old_item.filename)
             " Use the filename given.
             " Temporary files are assumed to be for this buffer,
             " and the filename is not included then, because it looks bad

autoload/ale/path.vim

@@ -80,22 +80,12 @@ function! ale#path#IsAbsolute(filename) abort
     return a:filename[:0] is# '/' || a:filename[1:2] is# ':\'
 endfunction
 
+let s:temp_dir = fnamemodify(tempname(), ':h')
+
 " Given a filename, return 1 if the file represents some temporary file
 " created by Vim.
 function! ale#path#IsTempName(filename) abort
-    let l:prefix_list = [
+    return a:filename[:len(s:temp_dir) - 1] is# s:temp_dir
-    \   $TMPDIR,
-    \   resolve($TMPDIR),
-    \   '/run/user',
-    \]
-
-    for l:prefix in l:prefix_list
-        if a:filename[:len(l:prefix) - 1] is# l:prefix
-            return 1
-        endif
-    endfor
-
-    return 0
 endfunction
 
 " Given a base directory, which must not have a trailing slash, and a

test/handler/test_ansible_lint_handler.vader

@@ -16,7 +16,7 @@ Execute(The ansible-lint handler should handle basic errors):
   \   },
   \ ],
   \ ale_linters#ansible#ansible_lint#Handle(bufnr(''), [
-  \   '/tmp/vxepmGL/1/main.yml:35: [EANSIBLE0002] Trailing whitespace',
+  \ fnamemodify(tempname(), ':h') . '/main.yml:35: [EANSIBLE0002] Trailing whitespace',
   \ ])
 
 Execute (The ansible-lint handler should handle names with spaces):
@@ -30,7 +30,7 @@ Execute (The ansible-lint handler should handle names with spaces):
   \   },
   \ ],
   \ ale_linters#ansible#ansible_lint#Handle(bufnr(''), [
-  \   '/tmp/vxepm GL/1/main.yml:6:6: E111 indentation is not a multiple of four',
+  \ fnamemodify(tempname(), ':h') . '/main.yml:6:6: E111 indentation is not a multiple of four',
   \ ])
 
 Execute (The ansible-lint handler should ignore errors from other files):

test/test_path_equality.vader

@@ -52,9 +52,4 @@ Execute(ale#path#IsBufferPath should accept various names for stdin):
 Execute(ale#path#IsBufferPath should match files in /tmp):
   call ale#test#SetFilename('app/test.ts')
 
-  " Skip these checks on Windows.
+  Assert ale#path#IsBufferPath(bufnr(''), tempname() . '/test.ts')
-  if !has('win32')
-    Assert ale#path#IsBufferPath(bufnr(''), '../../../../../../../../tmp/vG0hKyD/1/test.ts')
-    Assert ale#path#IsBufferPath(bufnr(''), '/tmp/vG0hKyD/1/test.ts')
-    Assert ale#path#IsBufferPath(bufnr(''), '/run/user/1000/vG0hKyD/1/test.ts')
-  endif