Re: [PATCH] Org Agenda Support Argument Collection for Custom Bulk Functions (was: Custom Bulk Functions With Prompt)

[Kevin Foley <kevin@kevinjfoley.me>]

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Attached patch should allow user to specify a function to collect
arguments when calling a custom bulk function such that those arguments
are only collected once and used for each entry.

Kevin Foley


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From dfab64f738f227691d84a2fdec5bba2cf4f1e3b0 Mon Sep 17 00:00:00 2001
From: "Kevin J. Foley" <kevin@kevinjfoley.me>
Date: Thu, 21 Jan 2021 08:48:52 -0500
Subject: [PATCH] org-agenda.el: Support argument collection for custom bulk
 functions

* lisp/org-agenda.el: (org-agenda-bulk-custom-functions): Add
documentation about for collection arguments for custom bulk functions.
(org-agenda-bulk-action): Support function to collect arguments for
custom bulk functions.
---
 lisp/org-agenda.el | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/lisp/org-agenda.el b/lisp/org-agenda.el
index dedf7e5bb..deadacc1e 100644
--- a/lisp/org-agenda.el
+++ b/lisp/org-agenda.el
@@ -2080,7 +2080,20 @@ (defcustom org-agenda-bulk-custom-functions nil
 
 With selected entries in an agenda buffer, `B R' will call
 the custom function `set-category' on the selected entries.
-Note that functions in this alist don't need to be quoted."
+Note that functions in this alist don't need to be quoted.
+
+If the custom function accepts arguments which you'd like to
+collect once from the user to be used for each call, you can pass
+a list with the bulk function, and the function which collects
+it's arguments and returns them as a list.  For example:
+
+  \\='((?R (set-category get-category))
+    (?C bulk-cut))
+
+Now, `B R' will call the custom `get-category' which would prompt
+the user once for a category.  That category is then passed as an
+argument to `set-category' for each entry it's called against.
+"
   :type '(alist :key-type character :value-type (group function))
   :version "24.1"
   :group 'org-agenda)
@@ -10487,7 +10500,12 @@ (defun org-agenda-bulk-action (&optional arg)
 
 	(action
 	 (pcase (assoc action org-agenda-bulk-custom-functions)
-	   (`(,_ ,f) (setq cmd f) (setq redo-at-end t))
+	   (`(,_ ,f)
+            (when (listp f)
+              (let ((args (funcall (nth 1 f)))
+                    (func (nth 0 f)))
+                (setq f (apply #'apply-partially func args))))
+            (setq cmd f) (setq redo-at-end t))
 	   (_ (user-error "Invalid bulk action: %c" action)))))
 
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