#653 Treat temporary filenames as being for the current buffer

autoload/ale/engine.vim

@@ -336,6 +336,9 @@ function! s:RemapItemTypes(type_map, loclist) abort
     endfor
 endfunction
 
+" Save the temporary directory so we can figure out if files are in it.
+let s:temp_dir = fnamemodify(tempname(), ':h')
+
 function! ale#engine#FixLocList(buffer, linter_name, loclist) abort
     let l:bufnr_map = {}
     let l:new_loclist = []
@@ -381,6 +384,10 @@ function! ale#engine#FixLocList(buffer, linter_name, loclist) abort
             elseif has_key(l:bufnr_map, l:filename)
                 " Get the buffer number from the map, which can be faster.
                 let l:item.bufnr = l:bufnr_map[l:filename]
+            elseif l:filename[:len(s:temp_dir) - 1] is# s:temp_dir
+                " Assume that any temporary files are for this buffer.
+                let l:item.bufnr = a:buffer
+                let l:bufnr_map[l:filename] = a:buffer
             else
                 " Look up the buffer number.
                 let l:item.bufnr = bufnr(l:filename)

test/test_loclist_corrections.vader

@@ -1,4 +1,5 @@
 After:
+  unlet! b:temp_name
   unlet! b:other_bufnr
 
 Given foo (Some file with lines to count):
@@ -291,3 +292,40 @@ Execute(FixLocList should accept filenames):
   \     {'text': 'a', 'lnum': 5, 'filename': '/foo/bar/baz'},
   \   ],
   \ )
+
+Execute(FixLocList should interpret temporary filenames as being the current buffer):
+  let b:temp_name = tempname()
+
+  AssertEqual
+  \ [
+  \   {
+  \     'text': 'a',
+  \     'lnum': 2,
+  \     'col': 0,
+  \     'bufnr': bufnr(''),
+  \     'filename': b:temp_name,
+  \     'vcol': 0,
+  \     'type': 'E',
+  \     'nr': -1,
+  \     'linter_name': 'foobar',
+  \   },
+  \   {
+  \     'text': 'a',
+  \     'lnum': 3,
+  \     'col': 0,
+  \     'bufnr': bufnr(''),
+  \     'filename': b:temp_name,
+  \     'vcol': 0,
+  \     'type': 'E',
+  \     'nr': -1,
+  \     'linter_name': 'foobar',
+  \   },
+  \],
+  \ ale#engine#FixLocList(
+  \   bufnr(''),
+  \   'foobar',
+  \   [
+  \     {'text': 'a', 'lnum': 2, 'filename': b:temp_name},
+  \     {'text': 'a', 'lnum': 3, 'filename': b:temp_name},
+  \   ],
+  \ )