Fix :h[elp] ex command

To now open documentation for ex commands, otherwise falling back to
apropos. If BANG, then searches Doom's (yet to be published) manual.

modules/editor/evil/autoload/ex.el

@@ -155,30 +155,24 @@ buffers."
 
 ;;;###autoload (autoload '+evil:help "editor/evil/autoload/ex" nil t)
 (evil-define-command +evil:help (&optional bang query)
-  "Look up help documentation for QUERY in Emacs documentation.
+  "Look up documentation for QUERY.
 
-If BANG, search Doom documentation."
+If QUERY is in the format of an ex command, it will map it to the underlying
+function and open its documentation with `helpful-function'. Otherwise, it will
+search for it with `apropos'.
+
+If QUERY is empty, this runs the equivalent of 'M-x apropos'. If BANG is
+non-nil, a search is preformed against Doom's manual (wiht `doom/help-search')."
   (interactive "<!><a>")
   (if bang
       (doom/help-search query)
-    (cond ((or (null query) (string-empty-p (string-trim query)))
-           (call-interactively
-            (or (command-remapping #'apropos)
-                #'apropos)))
-          ((string-match-p "^ *:[a-z]" query)
-           (let* ((modules
-                   (cl-loop for path in (doom-module-load-path 'all)
-                            for (cat . mod) = (doom-module-from-path path)
-                            for format = (format "%s %s" cat mod)
-                            if (doom-module-p cat mod)
-                            collect (propertize format 'module (list cat mod))
-                            else if (and cat mod)
-                            collect (propertize format
-                                                'face 'font-lock-comment-face
-                                                'module (list cat mod))))
-                  (module (completing-read "Describe module: " modules nil t query))
-                  (key (get-text-property 0 'module module)))
-             (doom/help-modules (car key) (cdr key))))
-          ((and (string-match-p "\\(?:SPC\\|[CMsSH]-[^ ]\\|<[^>]+>\\)" query)
-                (helpful-key (kbd (string-trim query)))))
-          ((apropos query t)))))
+    (save-match-data
+      (cond ((or (null query) (string-empty-p (string-trim query)))
+             (call-interactively
+              (or (command-remapping #'apropos)
+                  #'apropos)))
+            ((string-match "^ *:\\([^ ]+\\)$" query)
+             (helpful-function
+              (evil-ex-completed-binding (match-string 1 query))))
+            ((message "Searching for %S, this may take a while..." query)
+             (apropos query t))))))