Fix #922 - Prefer nearer ESLint configuration files with lower precedence filenames for eslint --fix

autoload/ale/fixers/eslint.vim

@@ -2,19 +2,21 @@
 " Description: Fixing files with eslint.
 
 function! s:FindConfig(buffer) abort
-    for l:filename in [
-    \   '.eslintrc.js',
-    \   '.eslintrc.yaml',
-    \   '.eslintrc.yml',
-    \   '.eslintrc.json',
-    \   '.eslintrc',
-    \   'package.json',
-    \]
-        let l:config = ale#path#FindNearestFile(a:buffer, l:filename)
+    for l:path in ale#path#Upwards(expand('#' . a:buffer . ':p:h'))
+        for l:basename in [
+        \   '.eslintrc.js',
+        \   '.eslintrc.yaml',
+        \   '.eslintrc.yml',
+        \   '.eslintrc.json',
+        \   '.eslintrc',
+        \   'package.json',
+        \]
+            let l:config = ale#path#Simplify(l:path . '/' . l:basename)
 
-        if !empty(l:config)
-            return l:config
-        endif
+            if filereadable(l:config)
+                return l:config
+            endif
+        endfor
     endfor
 
     return ''

test/fixers/test_eslint_fixer_callback.vader

@@ -17,18 +17,16 @@ Execute(The path to eslint.js should be run on Unix):
   \     . ' --fix %t',
   \ },
   \ ale#fixers#eslint#Fix(bufnr(''))
+  \
+Execute(The lower priority configuration file in a nested directory should be preferred):
+  call ale#test#SetFilename('../eslint-test-files/react-app/subdir-with-config/testfile.js')
 
-Execute(The eslint fixer with eslint.js should be run with node on Windows):
-  call ale#test#SetFilename('../eslint-test-files/react-app/subdir/testfile.js')
-  let g:ale_has_override['win32'] = 1
-
-  " We have to execute the file with node.
   AssertEqual
   \ {
   \   'read_temporary_file': 1,
-  \   'command': ale#Escape('node.exe') . ' '
-  \     . ale#Escape(simplify(g:dir . '/../eslint-test-files/react-app/node_modules/eslint/bin/eslint.js'))
-  \     . ' --config ' . ale#Escape(simplify(g:dir . '/../eslint-test-files/react-app/.eslintrc.js'))
+  \   'command':
+  \     ale#Escape(simplify(g:dir . '/../eslint-test-files/react-app/node_modules/eslint/bin/eslint.js'))
+  \     . ' --config ' . ale#Escape(simplify(g:dir . '/../eslint-test-files/react-app/subdir-with-config/.eslintrc'))
   \     . ' --fix %t',
   \ },
   \ ale#fixers#eslint#Fix(bufnr(''))