From 81cbffa65f4a4bf46a7ed0985171e82db82beced Mon Sep 17 00:00:00 2001 From: jao Date: Tue, 31 Aug 2021 02:21:06 +0100 Subject: [PATCH] emacs: notmuch-tree: customizable strings for drawing trees New customizable variable, notmuch-tree-thread-symbols, that allows tweaking of how trees in a forest are represented. For instance, one can now choose to use an hyphen rather than a white space as a prefix, or replace the character(s) used to draw arrows. Amended-By: db; delete errant '3' --- emacs/notmuch-tree.el | 44 +++++++++++++++++++++++++++++++++---------- 1 file changed, 34 insertions(+), 10 deletions(-) diff --git a/emacs/notmuch-tree.el b/emacs/notmuch-tree.el index 1efb95bb..001a367d 100644 --- a/emacs/notmuch-tree.el +++ b/emacs/notmuch-tree.el @@ -74,6 +74,30 @@ notmuch-unthreaded-show-out notmuch-tree-show-out)) +(defcustom notmuch-tree-thread-symbols + '((prefix . " ") + (top . "─") + (top-tee . "┬") + (vertical . "│") + (vertical-tee . "├") + (bottom . "╰") + (arrow . "►")) + "Strings used to draw trees in notmuch tree results. +Symbol keys denote where the corresponding string value is used: +`prefix' is used at the top of the tree, followed by `top' if it +has no children or `top-tee' if it does; `vertical' is a bar +connecting with a response down the list skipping the current +one, while `vertical-tee' marks the current message as a reply to +the previous one; `bottom' is used at the bottom of threads. +Finally, the `arrrow' string in the list is used as a pointer to +every message. + +Common customizations include setting `prefix' to \"-\", to see +equal-length prefixes, and `arrow' to an empty string or to a +different kind of arrow point." + :type '(alist :key-type symbol :value-type string) + :group 'notmuch-tree) + (defcustom notmuch-tree-result-format `(("date" . "%12s ") ("authors" . "%-20s") @@ -983,20 +1007,20 @@ message together with all its descendents." (replies (cadr tree))) (cond ((and (< 0 depth) (not last)) - (push "├" tree-status)) + (push (alist-get 'vertical-tee notmuch-tree-thread-symbols) tree-status)) ((and (< 0 depth) last) - (push "╰" tree-status)) + (push (alist-get 'bottom notmuch-tree-thread-symbols) tree-status)) ((and (eq 0 depth) first last) - ;; Choice between these two variants is a matter of taste. - ;; (push "─" tree-status)) - (push " " tree-status)) + (push (alist-get 'prefix notmuch-tree-thread-symbols) tree-status)) ((and (eq 0 depth) first (not last)) - (push "┬" tree-status)) + (push (alist-get 'top-tee notmuch-tree-thread-symbols) tree-status)) ((and (eq 0 depth) (not first) last) - (push "╰" tree-status)) + (push (alist-get 'bottom notmuch-tree-thread-symbols) tree-status)) ((and (eq 0 depth) (not first) (not last)) - (push "├" tree-status))) - (push (concat (if replies "┬" "─") "►") tree-status) + (push (alist-get 'vertical-tee notmuch-tree-thread-symbols) tree-status))) + (push (concat (alist-get (if replies 'top-tee 'top) notmuch-tree-thread-symbols) + (alist-get 'arrow notmuch-tree-thread-symbols)) + tree-status) (setq msg (plist-put msg :first (and first (eq 0 depth)))) (setq msg (plist-put msg :tree-status tree-status)) (setq msg (plist-put msg :orig-tags (plist-get msg :tags))) @@ -1005,7 +1029,7 @@ message together with all its descendents." (pop tree-status) (if last (push " " tree-status) - (push "│" tree-status)) + (push (alist-get 'vertical notmuch-tree-thread-symbols) tree-status)) (notmuch-tree-insert-thread replies (1+ depth) tree-status))) (defun notmuch-tree-insert-thread (thread depth tree-status)