(feat):support multi-line org titles (#2264)

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

CHANGELOG.md

@@ -4,6 +4,7 @@
 ### Added
 ### Removed
 ### Fixed
+- [#2264](https://github.com/org-roam/org-roam/pull/2264) Support multi-line org titles
 - [#2165](https://github.com/org-roam/org-roam/pull/2165) (fix)org-roam-file-p: don't exclude org-roam-directory
 - [#2168](https://github.com/org-roam/org-roam/pull/2168) (perf)node-read: filter nodes before mapping --to-candidate
 ### Changed

org-roam-db.el

@@ -346,7 +346,7 @@ If FILE is nil, clear the current buffer."
 If there is no title, return the file name relative to
 `org-roam-directory'."
   (org-link-display-format
-   (or (cadr (assoc "TITLE" (org-collect-keywords '("title"))))
+   (or (string-join (cdr (assoc "TITLE" (org-collect-keywords '("title")))) " ")
        (file-name-sans-extension (file-relative-name
                                   (buffer-file-name (buffer-base-buffer))
                                   org-roam-directory)))))

tests/test-org-roam-utils.el

@@ -36,4 +36,27 @@
      (org-roam-whitespace-content "foo\n\t\n")
      :to-equal "\n\t\n")))
 
+(describe "org-roam-db--file-title"
+  (it "supports normal titles"
+    (expect
+     (with-temp-buffer
+       (insert "#+title:normal title")
+       (org-roam-db--file-title))
+     :to-equal "normal title"))
+  (it "supports multi-line titles"
+    (expect
+     (with-temp-buffer
+       (insert "#+title: title:\n#+title: separated by newline")
+       (org-roam-db--file-title))
+     :to-equal "title: separated by newline"))
+  (it "supports file-name based titles"
+    (progn
+      (setq org-roam-directory temporary-file-directory
+            org-roam-db-location (expand-file-name "org-roam.db" temporary-file-directory)
+            org-roam-file-extensions '("org"))
+      (with-temp-buffer
+        (write-file (expand-file-name "test file.org" org-roam-directory))
+        (org-roam-db--file-title)))
+    :to-equal "test file"))
+
 (provide 'test-org-roam-utils)