Consider diagnostic.code when generating flymake diagnostics

Not sure this will please everybody, can almost guess someone is going
to ask for a custom switch.

Instead this info (and the source) should be passed on to Flymake.
That's where the custom switch for controlling formatting of
diagnostic messages should exist.  But that's too much work right now.

* eglot.el (eglot-handle-notification): Consider Diagnostic.code.

diff --git a/lisp/progmodes/eglot.el b/lisp/progmodes/eglot.el
index 81c545e64f9c51181dad4307b83598cc2dd35fa7..3a33ad3ec2b24b660c49d3fefe4436369bb1ad2e 100644 (file)
--- a/lisp/progmodes/eglot.el
+++ b/lisp/progmodes/eglot.el
@@ -1957,14 +1957,16 @@ COMMAND is a symbol naming the command."
               (cond ((null sev) 'eglot-error)
                     ((<= sev 1) 'eglot-error)
                     ((= sev 2)  'eglot-warning)
-                    (t          'eglot-note))))
+                    (t          'eglot-note)))
+            (mess (source code message)
+              (concat source (and code (concat " [" code "]")) ": " message)))
     (if-let ((buffer (find-buffer-visiting (eglot--uri-to-path uri))))
         (with-current-buffer buffer
           (cl-loop
            for diag-spec across diagnostics
-           collect (eglot--dbind ((Diagnostic) range message severity source tags)
+           collect (eglot--dbind ((Diagnostic) range code message severity source tags)
                        diag-spec
-                     (setq message (concat source ": " message))
+                     (setq message (mess source code message))
                      (pcase-let
                          ((`(,beg . ,end) (eglot--range-region range)))
                        ;; Fallback to `flymake-diag-region' if server
@@ -2001,8 +2003,8 @@ COMMAND is a symbol naming the command."
       (cl-loop
        with path = (expand-file-name (eglot--uri-to-path uri))
        for diag-spec across diagnostics
-       collect (eglot--dbind ((Diagnostic) range message severity source) diag-spec
-                 (setq message (concat source ": " message))
+       collect (eglot--dbind ((Diagnostic) code range message severity source) diag-spec
+                 (setq message (mess source code message))
                  (let* ((start (plist-get range :start))
                         (line (1+ (plist-get start :line)))
                         (char (1+ (plist-get start :character))))