From e697017957675e610ce6cf9ddd86e2ea73665061 Mon Sep 17 00:00:00 2001
From: Constantine Vetoshev <gepardcv@gmail.com>
Date: Wed, 11 Aug 2021 20:19:49 -0700
Subject: Simplify and improve Ivy and Counsel integration.

---
 perspective.el | 64 +++++++++++++++++++++++-----------------------------------
 1 file changed, 25 insertions(+), 39 deletions(-)

diff --git a/perspective.el b/perspective.el
index 1c615d0..038176d 100644
--- a/perspective.el
+++ b/perspective.el
@@ -1339,50 +1339,41 @@ PERSP-SET-IDO-BUFFERS)."
         (ibuffer))
     (ibuffer)))
 
-(defun persp--switch-buffer-ivy-counsel-helper (arg ivy-params fallback)
+;; Buffer switching integration: Ivy.
+;;
+;; An alternative implementation, which has the drawback of not allowing a
+;; prefix argument to list all buffers:
+;;
+;; (defun persp-ivy-read-advice (args)
+;;   (append args
+;;           (list :predicate
+;;                 (lambda (b) (persp-is-current-buffer (cdr b))))))
+;; (advice-add 'ivy-read :filter-args #'persp-ivy-read-advice)
+;; (advice-remove 'ivy-read #'persp-ivy-read-advice)
+
+(defun persp--switch-buffer-ivy-counsel-helper (arg fallback)
   (unless (featurep 'ivy)
     (user-error "Ivy not loaded"))
-  (defvar ivy-switch-buffer-map)
   (declare-function ivy-read "ivy.el")
-  (declare-function ivy-switch-buffer "ivy.el")
-  (declare-function ivy--switch-buffer-matcher "ivy.el")
-  (declare-function ivy--switch-buffer-action "ivy.el")
   (if (and persp-mode (null arg))
-      (apply #'ivy-read
-             (append
-              (list
-               (format "Switch to buffer (%s): " (persp-current-name))
-               (cl-remove-if #'null (mapcar #'buffer-name
-                                            ;; buffer-list is ordered by access time
-                                            ;; seq-intersection keeps the order
-                                            (seq-intersection (buffer-list)
-                                                              (persp-current-buffers))))
-               :preselect (buffer-name (persp-other-buffer (current-buffer)))
-               :keymap ivy-switch-buffer-map
-               :caller #'ivy-switch-buffer
-               :action #'ivy--switch-buffer-action
-               :matcher #'ivy--switch-buffer-matcher)
-              ivy-params))
+      (let ((real-ivy-read (symbol-function 'ivy-read)))
+        (cl-letf (((symbol-function 'ivy-read)
+                   (lambda (&rest args)
+                     (apply real-ivy-read
+                            (append args
+                                    (list :predicate
+                                          (lambda (b)
+                                            (persp-is-current-buffer (cdr b)))))))))
+          (funcall fallback)))
     (funcall fallback)))
 
-;; Buffer switching integration: Ivy.
 ;;;###autoload
 (defun persp-ivy-switch-buffer (arg)
   "A version of `ivy-switch-buffer' which respects perspectives."
   (interactive "P")
   (declare-function ivy-switch-buffer "ivy.el")
-  (declare-function ivy--buffer-list "ivy.el")
-  (let ((saved-ivy-buffer-list (symbol-function 'ivy--buffer-list))
-        (temp-ivy-buffer-list (lambda (_str &optional _virtual _predicate)
-                                (persp-current-buffer-names))))
-    (unwind-protect
-        (progn
-          (when (and persp-mode (null arg))
-            (setf (symbol-function 'ivy--buffer-list) temp-ivy-buffer-list))
-          (persp--switch-buffer-ivy-counsel-helper arg nil #'ivy-switch-buffer))
-      (setf (symbol-function 'ivy--buffer-list) saved-ivy-buffer-list))))
-
-;; Buffer switching integration: Counsel.
+  (persp--switch-buffer-ivy-counsel-helper arg #'ivy-switch-buffer))
+
 ;;;###autoload
 (defun persp-counsel-switch-buffer (arg)
   "A version of `counsel-switch-buffer' which respects perspectives."
@@ -1390,12 +1381,7 @@ PERSP-SET-IDO-BUFFERS)."
   (unless (featurep 'counsel)
     (user-error "Counsel not loaded"))
   (declare-function counsel-switch-buffer "counsel.el")
-  (declare-function counsel--switch-buffer-unwind "counsel.el")
-  (declare-function counsel--switch-buffer-update-fn "counsel.el")
-  (persp--switch-buffer-ivy-counsel-helper arg
-                                           (list :unwind #'counsel--switch-buffer-unwind
-                                                 :update-fn #'counsel--switch-buffer-update-fn)
-                                           #'counsel-switch-buffer))
+  (persp--switch-buffer-ivy-counsel-helper arg #'counsel-switch-buffer))
 
 
 ;;; --- durability implementation (persp-state-save and persp-state-load)
-- 
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