From 730b8f61e0cf4b2e8c0f123c0914d472d6df38fc Mon Sep 17 00:00:00 2001 From: Austin Clements Date: Thu, 24 Oct 2013 11:19:07 -0400 Subject: emacs: Use notmuch tag --batch for large tag queries (Unfortunately, it's difficult to first demonstrate this problem with a known-broken test because modern Linux kernels have argument length limits in the megabytes, which makes Emacs really slow!) --- emacs/notmuch-lib.el | 8 ++++++++ emacs/notmuch-tag.el | 15 +++++++++++++-- 2 files changed, 21 insertions(+), 2 deletions(-) (limited to 'emacs') diff --git a/emacs/notmuch-lib.el b/emacs/notmuch-lib.el index 17040ed8..08a86fd3 100644 --- a/emacs/notmuch-lib.el +++ b/emacs/notmuch-lib.el @@ -355,6 +355,14 @@ user-friendly queries." "Return a query that matches the message with id ID." (concat "id:" (notmuch-escape-boolean-term id))) +(defun notmuch-hex-encode (str) + "Hex-encode STR (e.g., as used by batch tagging). + +This replaces spaces, percents, and double quotes in STR with +%NN where NN is the hexadecimal value of the character." + (replace-regexp-in-string + "[ %\"]" (lambda (match) (format "%%%02x" (aref match 0))) str)) + ;; (defun notmuch-common-do-stash (text) diff --git a/emacs/notmuch-tag.el b/emacs/notmuch-tag.el index f705ac5d..b60f46c7 100644 --- a/emacs/notmuch-tag.el +++ b/emacs/notmuch-tag.el @@ -261,6 +261,12 @@ from TAGS if present." (error "Changed tag must be of the form `+this_tag' or `-that_tag'"))))) (sort result-tags 'string<))) +(defconst notmuch-tag-argument-limit 1000 + "Use batch tagging if the tagging query is longer than this. + +This limits the length of arguments passed to the notmuch CLI to +avoid system argument length limits and performance problems.") + (defun notmuch-tag (query tag-changes) "Add/remove tags in TAG-CHANGES to messages matching QUERY. @@ -279,8 +285,13 @@ notmuch-after-tag-hook will be run." tag-changes) (unless (null tag-changes) (run-hooks 'notmuch-before-tag-hook) - (apply 'notmuch-call-notmuch-process "tag" - (append tag-changes (list "--" query))) + (if (<= (length query) notmuch-tag-argument-limit) + (apply 'notmuch-call-notmuch-process "tag" + (append tag-changes (list "--" query))) + ;; Use batch tag mode to avoid argument length limitations + (let ((batch-op (concat (mapconcat #'notmuch-hex-encode tag-changes " ") + " -- " query))) + (notmuch-call-notmuch-process :stdin-string batch-op "tag" "--batch"))) (run-hooks 'notmuch-after-tag-hook))) (defun notmuch-tag-change-list (tags &optional reverse) -- cgit v1.2.3