Merge pull request #1142 from rhysd/redpen-ext

* redpen support for asciidoc, reST, LaTeX and Re:VIEW
* redpen: fix start column
* add redpen as text linter

autoload/ale/handlers/redpen.vim

@@ -0,0 +1,29 @@
+" Author: rhysd https://rhysd.github.io
+" Description: Redpen, a proofreading tool (http://redpen.cc)
+
+function! ale#handlers#redpen#HandleRedpenOutput(buffer, lines) abort
+    " Only one file was passed to redpen. So response array has only one
+    " element.
+    let l:res = json_decode(join(a:lines))[0]
+    let l:output = []
+    for l:err in l:res.errors
+        let l:item = {
+        \   'text': l:err.message . ' (' . l:err.validator . ')',
+        \   'type': 'W',
+        \}
+        if has_key(l:err, 'startPosition')
+            let l:item.lnum = l:err.startPosition.lineNum
+            let l:item.col = l:err.startPosition.offset + 1
+            if has_key(l:err, 'endPosition')
+                let l:item.end_lnum = l:err.endPosition.lineNum
+                let l:item.end_col = l:err.endPosition.offset
+            endif
+        else
+            let l:item.lnum = l:err.lineNum
+            let l:item.col = l:err.sentenceStartColumnNum + 1
+        endif
+        call add(l:output, l:item)
+    endfor
+    return l:output
+endfunction
+