Note down some discoveries about org-refile completion

1 files changed, 26 insertions, 3 deletions

diff --git a/itches/emacs/tracker.org b/itches/emacs/tracker.org
index b667de5..a9c3507 100644
--- a/itches/emacs/tracker.org
+++ b/itches/emacs/tracker.org
@@ -504,9 +504,32 @@ allows "ipsum" to be aligned below "lorem".
 ID, but it returns integers, so maybe the tweak should be made
 somewhere above in the call stack?
 **** TODO Make org-refile completion more similar to filename completion
-With =C-x p p=, =C-x p f=, and Gnus's =B m=, typing "bar" matches
-"foo/bar".  Not in org-refile with ~org-refile-use-outline-path~, for
-some reason.
+I'd like to have org-refile completion work like =C-x p p=, =C-x p f=, and
+Gnus's =B m=, where typing "bar" matches "x/bar".
+
+Current org-refile config:
+#+begin_src elisp
+(setq org-refile-targets (list (cons nil (cons :maxlevel 10)))
+      org-refile-use-outline-path t
+      org-outline-path-complete-in-steps nil)
+#+end_src
+
+IIUC =C-x p= commands use ~project--file-completion-table~, which passes a
+lambda to ~completing-read~ which returns ~(category . project-file)~
+metadata, and…
+
+#+begin_src elisp
+(alist-get 'styles (alist-get 'project-file completion-category-defaults))
+#+end_src
+
+… says =substring=.  Likewise, ~gnus-summary-move-article~ uses
+~gnus-completing-read~, which by default uses
+~gnus-emacs-completing-read~, which sets ~completion-styles~ to
+~gnus-completion-styles~, which includes =substring=.
+
+Ergo: either I add =substring= to my ~completion-styles~, or I teach
+~org-refile~ to use =substring=… by default? when ~path-complete-in-steps~
+is nil? depending on a user option? 🤔
 *** Programming modes
 **** ~conf-mode~
 ***** TODO Tweak ~javaprop~ comments