Specify a parent customization group

pip-frame.el

@@ -1,7 +1,12 @@
-;;; pip-frame.el --- PIP frame support  -*- lexical-binding: t -*-
+;;; pip-frame.el --- Display and manage a PIP frame  -*- lexical-binding: t -*-
 
 ;; Copyright (C) 2022 Milan Zamazal <pdm@zamazal.org>
 
+;; Author: Milan Zamazal <pdm@zamazal.org>
+;; Package-Version: 1
+;; Keywords: frames
+;; URL: https://git.zamazal.org/pdm/pip-frame
+
 ;; COPYRIGHT NOTICE
 ;;
 ;; This program is free software: you can redistribute it and/or modify
@@ -17,6 +22,8 @@
 ;; You should have received a copy of the GNU General Public License
 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+;;; Commentary:
+;;
 ;; Display a floating Emacs frame with selected buffers.
 ;; Similar to PIP on screens.  Probably most useful in EXWM.
 ;;
@@ -28,7 +35,8 @@
 (require 'cl-lib)
 
 (defgroup pip-frame ()
-  "Display PIP frame.")
+  "Display PIP frame."
+  :group 'frames)
 
 (defcustom pip-frame-scale 4
   "How many times to shrink the PIP frame relative to the display size."
@@ -71,7 +79,7 @@ custom option but it can be overriden here."
 
 (defun pip-frame--get-frame (&optional no-error)
   (let ((frame (cl-find pip-frame--name (frame-list)
-                        :key #'(lambda (f) (frame-parameter f 'name)))))
+                        :key (lambda (f) (frame-parameter f 'name)))))
     (or frame
         (unless no-error
           (error "No PIP frame")))))
@@ -85,8 +93,8 @@ custom option but it can be overriden here."
         (frame-inhibit-implied-resize t)
         (face-height (round (/ (face-attribute 'default :height) pip-frame-font-scale))))
     (set-face-attribute 'default frame :height face-height)
-    (mapc #'(lambda (p) (set-face-attribute 'default frame (car p) (cdr p)))
-          pip-frame-face-attributes)
+    (dolist (p pip-frame-face-attributes)
+      (set-face-attribute 'default frame (car p) (cdr p)))
     (set-window-buffer (car (window-list frame)) buffer)
     frame))
 
@@ -102,11 +110,11 @@ custom option but it can be overriden here."
   (let ((windows (window-list (pip-frame--get-frame))))
     (unless (and temporary
                  (cl-find buffer windows :key #'window-buffer :test #'eq))
-      (let* ((sizes (mapcar #'(lambda (w)
-                                (let ((width (window-body-width w t))
-                                      (height (window-body-height w t)))
-                                  (cons (+ (* width width) (* height height))
-                                        w)))
+      (let* ((sizes (mapcar (lambda (w)
+                              (let ((width (window-body-width w t))
+                                    (height (window-body-height w t)))
+                                (cons (+ (* width width) (* height height))
+                                      w)))
                             windows))
              (largest (cdr (cl-first (cl-sort sizes #'> :key #'car))))
              (side (if (> (window-body-width largest t)
@@ -170,7 +178,7 @@ If the buffer is not present in the PIP frame, do nothing."
                                        :test-not #'eq)))
     (if (= (length windows-to-delete) (length windows))
         (pip-frame-delete-frame)
-      (mapc #'delete-window windows-to-delete))))
+      (seq-do #'delete-window windows-to-delete))))
 
 (defun pip-frame--move (x y)
   (let ((frame (pip-frame--get-frame)))