(feat): add vanilla org-mode-tag-source (#1093)

Co-authored-by: Jethro Kuan <jethrokuan95@gmail.com>

CHANGELOG.md

@@ -10,6 +10,7 @@ In this release we support fuzzy links of the form `[[Title]]`, `[[*Headline]]`
 
 ### Features
 
+- [#1093](https://github.com/org-roam/org-roam/pull/1093) Add `vanilla` org-roam-tag-source to extract buffer Org tags
 - [#1079](https://github.com/org-roam/org-roam/pull/1079) Add `org-roam-tag-face` to customize appearance of tags in interactive commandsg
 - [#1073](https://github.com/org-roam/org-roam/pull/1073) Rename file on title change, when `org-roam-rename-file-on-title-change` is non-nil.
 - [#1071](https://github.com/org-roam/org-roam/pull/1071) Update link descriptions on title changes, and clean-up rename file advice

org-roam.el

@@ -197,7 +197,9 @@ extraction methods:
     Tags are space delimited.
     Tags may contain spaces if they are double-quoted.
     e.g. #+roam_tags: TAG \"tag with spaces\"
-
+  `vanilla'
+    Extract vanilla `org-mode' tags, including #+FILETAGS and
+    inherited tags.
   `all-directories'
     Extract sub-directories relative to `org-roam-directory'.
     That is, if a file is located at relative path foo/bar/file.org,
@@ -726,6 +728,11 @@ tag."
                     (buffer-file-name)))
          nil)))))
 
+(defun org-roam--extract-tags-vanilla (_file)
+  "Extract vanilla `org-mode' tags.
+This includes all tags used in the buffer."
+  (-flatten (org-get-buffer-tags)))
+
 (defun org-roam--extract-tags (&optional file)
   "Extract tags from the current buffer.
 If file-path FILE, use it to determine the directory tags.