From 1a2b3fde44d0e1934e5d5909195614b8cacb8ecb Mon Sep 17 00:00:00 2001 From: Felix Dietrich Date: Sun, 6 Mar 2022 20:41:41 +0100 Subject: [PATCH] =?utf8?q?Restructure=20=E2=80=98mailcap-add-mailcap-entry?= =?utf8?q?=E2=80=99?= MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit * lisp/net/mailcap.el (mailcap-add-mailcap-entry): Restructure mailcap-add-mailcap-entry to improve readability. --- lisp/net/mailcap.el | 56 +++++++++++++++++++++++++++++---------------- 1 file changed, 36 insertions(+), 20 deletions(-) diff --git a/lisp/net/mailcap.el b/lisp/net/mailcap.el index 469643dbca4..1fa41303396 100644 --- a/lisp/net/mailcap.el +++ b/lisp/net/mailcap.el @@ -716,27 +716,43 @@ to supply to the test." result)))) (defun mailcap-add-mailcap-entry (major minor info &optional storage) + "Add handler INFO for mime type MAJOR/MINOR to STORAGE. + +MAJOR and MINOR should be strings. MINOR is treated as a regexp +in later lookups, and, therefore, you may need to escape it +appropriately. + +The format of INFO is described in ‘mailcap-mime-data’. + +STORAGE should be a symbol refering to a variable. The value of +this variable should have the same format as ‘mailcap-mime-data’. +STORAGE defaults to ‘mailcap--computed-mime-data’. + +None of this is enforced." (let* ((storage (or storage 'mailcap--computed-mime-data)) - (old-major (assoc major (symbol-value storage)))) - (if (null old-major) ; New major area - (set storage - (cons (cons major (list (cons minor info))) - (symbol-value storage))) - (let ((cur-minor (assoc minor old-major))) - (cond - ((or (null cur-minor) ; New minor area, or - (assq 'test info)) ; Has a test, insert at beginning - (setcdr old-major - (cons (cons minor info) (cdr old-major)))) - ((and (not (assq 'test info)) ; No test info, replace completely - (not (assq 'test cur-minor)) - (equal (assq 'viewer info) ; Keep alternative viewer - (assq 'viewer cur-minor))) - (setcdr cur-minor info)) - (t - (setcdr old-major - (setcdr old-major - (cons (cons minor info) (cdr old-major)))))))))) + (major-entry (assoc major (symbol-value storage))) + (new-minor-entry (cons minor info)) + minor-entry) + (cond + ((null major-entry) + ;; Add a new major entry containing the new minor entry. + (setf major-entry (list major new-minor-entry)) + (push major-entry (symbol-value storage))) + ((and (setf minor-entry (assoc minor major-entry)) + (not (assq 'test info)) + (not (assq 'test minor-entry)) + (equal (assq 'viewer info) + (assq 'viewer minor-entry))) + ;; Replace a previous MINOR entry if it and the entry to be + ;; added both do *not* have a ‘test’ associated in their info + ;; alist and both use the same ‘viewer’ command. This ignores + ;; other fields in the previous entryʼs info alist: they will be + ;; lost when the info alist in the cdr of the previous entry is + ;; replaced with the new INFO alist. + (setf (cdr minor-entry) info)) + (t + ;; Add the new minor entry to the existing major entry. + (push new-minor-entry (cdr major-entry)))))) (defun mailcap-add (type viewer &optional test) "Add VIEWER as a handler for TYPE. -- 2.39.2