Use syntastic instead of pyflakes (supports a ton of more languages)

sources_non_forked/syntastic/plugin/syntastic/highlighting.vim

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+if exists("g:loaded_syntastic_notifier_highlighting")
+    finish
+endif
+let g:loaded_syntastic_notifier_highlighting = 1
+
+" Highlighting requires getmatches introduced in 7.1.040
+let s:has_highlighting = v:version > 701 || (v:version == 701 && has('patch040'))
+
+if !exists("g:syntastic_enable_highlighting")
+    let g:syntastic_enable_highlighting = 1
+endif
+
+let g:SyntasticHighlightingNotifier = {}
+
+let s:setup_done = 0
+
+" Public methods {{{1
+
+function! g:SyntasticHighlightingNotifier.New()
+    let newObj = copy(self)
+
+    if !s:setup_done
+        call self._setup()
+        let s:setup_done = 1
+    endif
+
+    return newObj
+endfunction
+
+function! g:SyntasticHighlightingNotifier.enabled()
+    return
+        \ s:has_highlighting &&
+        \ (exists('b:syntastic_enable_highlighting') ? b:syntastic_enable_highlighting : g:syntastic_enable_highlighting)
+endfunction
+
+" Sets error highlights in the cuirrent window
+function! g:SyntasticHighlightingNotifier.refresh(loclist)
+    if self.enabled()
+        call self.reset(a:loclist)
+        call syntastic#log#debug(g:SyntasticDebugNotifications, 'highlighting: refresh')
+        let buf = bufnr('')
+        let issues = filter(a:loclist.copyRaw(), 'v:val["bufnr"] == buf')
+        for item in issues
+            let group = item['type'] ==? 'E' ? 'SyntasticError' : 'SyntasticWarning'
+
+            " The function `Syntastic_{filetype}_{checker}_GetHighlightRegex` is
+            " used to override default highlighting.
+            if has_key(item, 'hl')
+                call matchadd(group, '\%' . item['lnum'] . 'l' . item['hl'])
+            elseif get(item, 'col', 0)
+                if get(item, 'vcol', 0)
+                    let lastcol = virtcol([item['lnum'], '$'])
+                    let coltype = 'v'
+                else
+                    let lastcol = col([item['lnum'], '$'])
+                    let coltype = 'c'
+                endif
+                let lcol = min([lastcol, item['col']])
+
+                call matchadd(group, '\%' . item['lnum'] . 'l\%' . lcol . coltype)
+            endif
+        endfor
+    endif
+endfunction
+
+" Remove all error highlights from the window
+" @vimlint(EVL103, 1, a:loclist)
+function! g:SyntasticHighlightingNotifier.reset(loclist)
+    if s:has_highlighting
+        call syntastic#log#debug(g:SyntasticDebugNotifications, 'highlighting: reset')
+        for match in getmatches()
+            if stridx(match['group'], 'Syntastic') == 0
+                call matchdelete(match['id'])
+            endif
+        endfor
+    endif
+endfunction
+" @vimlint(EVL103, 0, a:loclist)
+
+" Private methods {{{1
+
+" One time setup: define our own highlighting
+function! g:SyntasticHighlightingNotifier._setup()
+    if s:has_highlighting
+        if !hlexists('SyntasticError')
+            highlight link SyntasticError SpellBad
+
+        endif
+        if !hlexists('SyntasticWarning')
+            highlight link SyntasticWarning SpellCap
+        endif
+    endif
+endfunction
+
+" vim: set sw=4 sts=4 et fdm=marker: