#852 Capture error codes for ESLint

autoload/ale/handlers/eslint.vim

@@ -48,7 +48,7 @@ function! ale#handlers#eslint#GetCommand(buffer) abort
 endfunction
 
 let s:col_end_patterns = [
-\   '\vParsing error: Unexpected token (.+) ',
+\   '\vParsing error: Unexpected token (.+) ?',
 \   '\v''(.+)'' is not defined.',
 \   '\v%(Unexpected|Redundant use of) [''`](.+)[''`]',
 \   '\vUnexpected (console) statement',
@@ -111,7 +111,6 @@ function! ale#handlers#eslint#Handle(buffer, lines) abort
     let l:output = []
 
     for l:match in ale#util#GetMatches(a:lines, [l:pattern, l:parsing_pattern])
-        let l:type = 'Error'
         let l:text = l:match[3]
 
         if ale#Var(a:buffer, 'javascript_eslint_suppress_eslintignore')
@@ -120,19 +119,24 @@ function! ale#handlers#eslint#Handle(buffer, lines) abort
             endif
         endif
 
-        " Take the error type from the output if available.
-        if !empty(l:match[4])
-            let l:type = split(l:match[4], '/')[0]
-            let l:text .= ' [' . l:match[4] . ']'
-        endif
-
         let l:obj = {
         \   'lnum': l:match[1] + 0,
         \   'col': l:match[2] + 0,
         \   'text': l:text,
-        \   'type': l:type is# 'Warning' ? 'W' : 'E',
+        \   'type': 'E',
         \}
 
+        " Take the error type from the output if available.
+        let l:split_code = split(l:match[4], '/')
+
+        if get(l:split_code, 0, '') is# 'Warning'
+            let l:obj.type = 'W'
+        endif
+
+        if !empty(get(l:split_code, 1))
+            let l:obj.code = l:split_code[1]
+        endif
+
         for l:col_match in ale#util#GetMatches(l:text, s:col_end_patterns)
             let l:obj.end_col = l:obj.col + len(l:col_match[1]) - 1
         endfor

test/handler/test_eslint_handler.vader

@@ -19,13 +19,15 @@ Execute(The eslint handler should parse lines correctly):
   \   {
   \     'lnum': 47,
   \     'col': 14,
-  \     'text': 'Missing trailing comma. [Warning/comma-dangle]',
+  \     'text': 'Missing trailing comma.',
+  \     'code': 'comma-dangle',
   \     'type': 'W',
   \   },
   \   {
   \     'lnum': 56,
   \     'col': 41,
-  \     'text': 'Missing semicolon. [Error/semi]',
+  \     'text': 'Missing semicolon.',
+  \     'code': 'semi',
   \     'type': 'E',
   \   },
   \   {
@@ -259,42 +261,47 @@ Execute(The eslint handler should output end_col values where appropriate):
   \     'lnum': 4,
   \     'col': 3,
   \     'end_col': 15,
-  \     'text': 'Parsing error: Unexpected token ''some string'' [Error]',
+  \     'text': 'Parsing error: Unexpected token ''some string''',
   \     'type': 'E',
   \   },
   \   {
   \     'lnum': 70,
   \     'col': 3,
   \     'end_col': 5,
-  \     'text': '''foo'' is not defined. [Error/no-undef]',
+  \     'text': '''foo'' is not defined.',
+  \     'code': 'no-undef',
   \     'type': 'E',
   \   },
   \   {
   \     'lnum': 71,
   \     'col': 2,
   \     'end_col': 6,
-  \     'text': 'Unexpected `await` inside a loop. [Error/no-await-in-loop]',
+  \     'text': 'Unexpected `await` inside a loop.',
+  \     'code': 'no-await-in-loop',
   \     'type': 'E',
   \   },
   \   {
   \     'lnum': 72,
   \     'col': 6,
   \     'end_col': 10,
-  \     'text': 'Redundant use of `await` on a return value. [Error/no-return-await]',
+  \     'text': 'Redundant use of `await` on a return value.',
+  \     'code': 'no-return-await',
   \     'type': 'E',
   \   },
   \   {
   \     'lnum': 73,
   \     'col': 4,
   \     'end_col': 10,
-  \     'text': 'Unexpected console statement [Error/no-console]',
+  \     'text': 'Unexpected console statement',
+  \     'code': 'no-console',
   \     'type': 'E',
   \   },
   \   {
   \     'lnum': 74,
   \     'col': 4,
   \     'end_col': 11,
-  \     'text': 'Unexpected ''debugger'' statement. [Error/no-debugger]',
+  \     'text': 'Unexpected ''debugger'' statement.',
+  \     'code': 'no-debugger',
   \     'type': 'E',
   \   },
   \ ],
@@ -316,7 +323,7 @@ Execute(The eslint hint about using typescript-eslint-parser):
   \     'lnum': 451,
   \     'col': 2,
   \     'end_col': 2,
-  \     'text': 'Parsing error (You may need configure typescript-eslint-parser): Unexpected token ) [Error]',
+  \     'text': 'Parsing error (You may need configure typescript-eslint-parser): Unexpected token )',
   \     'type': 'E',
   \   },
   \ ],
@@ -330,7 +337,7 @@ Execute(eslint should warn about ignored files by default):
   \    'lnum': 0,
   \    'col': 0,
   \    'type': 'W',
-  \    'text': 'File ignored because of a matching ignore pattern. Use "--no-ignore" to override. [Warning]'
+  \    'text': 'File ignored because of a matching ignore pattern. Use "--no-ignore" to override.'
   \ }],
   \ ale#handlers#eslint#Handle(bufnr(''), [
   \  '/path/to/some/ignored.js:0:0: File ignored because of a matching ignore pattern. Use "--no-ignore" to override. [Warning]',