Rework of message decoding for flake8.

syntax_checkers/python/flake8.vim

@@ -23,15 +23,38 @@ function! SyntaxCheckers_python_flake8_GetLocList() dict
 
     let errorformat =
         \ '%E%f:%l: could not compile,%-Z%p^,' .
-        \ '%E%f:%l:%c: F%n %m,' .
+        \ '%A%f:%l:%c: %t%n %m,' .
-        \ '%W%f:%l:%c: C%n %m,' .
+        \ '%A%f:%l: %t%n %m,' .
-        \ '%W%f:%l:%c: %.%n %m,' .
-        \ '%W%f:%l: %.%n %m,' .
         \ '%-G%.%#'
 
-    return SyntasticMake({
+    let loclist = SyntasticMake({
         \ 'makeprg': makeprg,
         \ 'errorformat': errorformat })
+
+    for e in loclist
+        " E*** and W*** are pep8 errors
+        " F*** are PyFlakes codes
+        " C*** are McCabe complexity messages
+        " N*** are naming conventions from pep8-naming
+
+        if has_key(e, 'nr')
+            let e['text'] .= printf(' [%s%03d]', e['type'], e['nr'])
+            " E901 are syntax errors
+            " E902 are I/O errors
+            if e['type'] ==? 'E' && e['nr'] !~ '\m^9'
+                let e['subtype'] = 'Style'
+            endif
+            call remove(e, 'nr')
+        endif
+
+        if e['type'] =~? '\m^[CNW]'
+            let e['subtype'] = 'Style'
+        endif
+
+        let e['type'] = e['type'] =~? '\m^[EFC]' ? 'E' : 'W'
+    endfor
+
+    return loclist
 endfunction
 
 runtime! syntax_checkers/python/pyflakes.vim