setup for flycheck

[VladimirAlexiev]

Flycheck is a replacement for flymake. Would be good to include this setup:

;; flycheck is a replacement of flymake & smart-compile
;; https://www.masteringemacs.org/article/spotlight-flycheck-a-flymake-replacement

(require 'flycheck)
(flycheck-define-checker rnc-jing
  "RNC syntax checker using jing.
Home: https://github.com/relaxng/jing-trang (was https://jing-trang.googlecode.com).
Binary: https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/jing-trang/jing-20091111.zip.
Manual: https://relaxng.org/jclark/jing.html"
  :command ("java"
            "-Xss8M" ; increase stack size to 8M, else get
            ;; Exception in thread "main" java.lang.StackOverflowError
            ;; at com.thaiopensource.relaxng.pattern.BinaryPattern.checkRecursion(BinaryPattern.java:16)
            "-jar" "c:/prog/jing-20091111/bin/jing.jar"
            "-c" ; RelaxNG Compact
            "-i" ; else any xsd:ID element returns error
            ;; `a "data" or "value" pattern with non-null ID-type must occur as the child of an "attribute" pattern`,
            ;; see http://blog.jclark.com/2009/01/relax-ng-and-xmlid.html 
            source)
  :error-patterns
  ((error line-start (file-name) ":" line ":" column ": " (or "error" "fatal") ": " (message) line-end)
   (error "fatal" ":" (message) line-end)
   (info line-start (file-name) ":" line ":" column ": " (message) line-end))
  :modes rnc-mode)
(add-to-list 'flycheck-checkers 'rnc-jing)

And then disable flymake, see next issue