Search for org-mode headings across all projects

Question

Is there a function to search for a heading in all org-mode files in all known Projectile projects?

I see that I can search for a string, but can I restrict it to an org-mode heading?;)

Answer 1

One way to achieve it is by taking inspiration from the project-find-regexp function. Instead of using files from the project, or from a directory, we give it all org files from all projectile-known-projects:

(defun my-search-heading-across-projects ()
  (interactive)
  (let ((files (seq-filter (lambda (b) (string-match "org$" b))
                           (mapcan (lambda (root)
                                     (mapcar (lambda (f)
                                               (concat root f))
                                             (projectile-project-files root)))
                                   projectile-known-projects))))
    (xref-show-xrefs
     (apply-partially #'project--find-regexp-in-files "^\\*+" files)
     nil)))

This function will list all headings. You can then search for the heading using isearch (or narrow down if you use some completion framework like ivy/helm i.c.w. helm-xref / ivy-xref), and subsequently jump to the 'selected' heading by pressing RET.