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

sources_non_forked/syntastic/plugin/syntastic/signs.vim

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+if exists("g:loaded_syntastic_notifier_signs")
+    finish
+endif
+let g:loaded_syntastic_notifier_signs = 1
+
+if !exists("g:syntastic_enable_signs")
+    let g:syntastic_enable_signs = 1
+endif
+
+if !exists("g:syntastic_error_symbol")
+    let g:syntastic_error_symbol = '>>'
+endif
+
+if !exists("g:syntastic_warning_symbol")
+    let g:syntastic_warning_symbol = '>>'
+endif
+
+if !exists("g:syntastic_style_error_symbol")
+    let g:syntastic_style_error_symbol = 'S>'
+endif
+
+if !exists("g:syntastic_style_warning_symbol")
+    let g:syntastic_style_warning_symbol = 'S>'
+endif
+
+
+" start counting sign ids at 5000, start here to hopefully avoid conflicting
+" with any other code that places signs (not sure if this precaution is
+" actually needed)
+let s:first_sign_id = 5000
+let s:next_sign_id = s:first_sign_id
+
+let g:SyntasticSignsNotifier = {}
+
+let s:setup_done = 0
+
+" Public methods {{{1
+
+function! g:SyntasticSignsNotifier.New()
+    let newObj = copy(self)
+
+    if !s:setup_done
+        call self._setup()
+        let s:setup_done = 1
+    endif
+
+    return newObj
+endfunction
+
+function! g:SyntasticSignsNotifier.enabled()
+    return
+        \ has('signs') &&
+        \ exists('b:syntastic_enable_signs') ? b:syntastic_enable_signs : g:syntastic_enable_signs
+endfunction
+
+function! g:SyntasticSignsNotifier.refresh(loclist)
+    call syntastic#log#debug(g:SyntasticDebugNotifications, 'signs: refresh')
+    let old_signs = copy(self._bufSignIds())
+    if self.enabled()
+        call self._signErrors(a:loclist)
+    endif
+    call self._removeSigns(old_signs)
+    let s:first_sign_id = s:next_sign_id
+endfunction
+
+" Private methods {{{1
+
+" One time setup: define our own sign types and highlighting
+function! g:SyntasticSignsNotifier._setup()
+    if has('signs')
+        if !hlexists('SyntasticErrorSign')
+            highlight link SyntasticErrorSign error
+        endif
+        if !hlexists('SyntasticWarningSign')
+            highlight link SyntasticWarningSign todo
+        endif
+        if !hlexists('SyntasticStyleErrorSign')
+            highlight link SyntasticStyleErrorSign SyntasticErrorSign
+        endif
+        if !hlexists('SyntasticStyleWarningSign')
+            highlight link SyntasticStyleWarningSign SyntasticWarningSign
+        endif
+        if !hlexists('SyntasticStyleErrorLine')
+            highlight link SyntasticStyleErrorLine SyntasticErrorLine
+        endif
+        if !hlexists('SyntasticStyleWarningLine')
+            highlight link SyntasticStyleWarningLine SyntasticWarningLine
+        endif
+
+        " define the signs used to display syntax and style errors/warns
+        exe 'sign define SyntasticError text=' . g:syntastic_error_symbol .
+            \ ' texthl=SyntasticErrorSign linehl=SyntasticErrorLine'
+        exe 'sign define SyntasticWarning text=' . g:syntastic_warning_symbol .
+            \ ' texthl=SyntasticWarningSign linehl=SyntasticWarningLine'
+        exe 'sign define SyntasticStyleError text=' . g:syntastic_style_error_symbol .
+            \ ' texthl=SyntasticStyleErrorSign linehl=SyntasticStyleErrorLine'
+        exe 'sign define SyntasticStyleWarning text=' . g:syntastic_style_warning_symbol .
+            \ ' texthl=SyntasticStyleWarningSign linehl=SyntasticStyleWarningLine'
+    endif
+endfunction
+
+" Place signs by all syntax errors in the buffer
+function! g:SyntasticSignsNotifier._signErrors(loclist)
+    let loclist = a:loclist
+    if !loclist.isEmpty()
+
+        " errors some first, so that they are not masked by warnings
+        let buf = bufnr('')
+        let issues = copy(loclist.errors())
+        call extend(issues, loclist.warnings())
+        call filter(issues, 'v:val["bufnr"] == buf')
+        let seen = {}
+
+        for i in issues
+            if !has_key(seen, i['lnum'])
+                let seen[i['lnum']] = 1
+
+                let sign_severity = i['type'] ==? 'W' ? 'Warning' : 'Error'
+                let sign_subtype = get(i, 'subtype', '')
+                let sign_type = 'Syntastic' . sign_subtype . sign_severity
+
+                execute "sign place " . s:next_sign_id . " line=" . i['lnum'] . " name=" . sign_type . " buffer=" . i['bufnr']
+                call add(self._bufSignIds(), s:next_sign_id)
+                let s:next_sign_id += 1
+            endif
+        endfor
+    endif
+endfunction
+
+" Remove the signs with the given ids from this buffer
+function! g:SyntasticSignsNotifier._removeSigns(ids)
+    if has('signs')
+        for i in a:ids
+            execute "sign unplace " . i
+            call remove(self._bufSignIds(), index(self._bufSignIds(), i))
+        endfor
+    endif
+endfunction
+
+" Get all the ids of the SyntaxError signs in the buffer
+function! g:SyntasticSignsNotifier._bufSignIds()
+    if !exists("b:syntastic_sign_ids")
+        let b:syntastic_sign_ids = []
+    endif
+    return b:syntastic_sign_ids
+endfunction
+
+" vim: set sw=4 sts=4 et fdm=marker: