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mu4e: add support for mutt-like thread tree prefix

This commit is contained in:
Marcelo Henrique Cerri 2018-04-23 01:07:58 -03:00
parent 297120dc6c
commit 0b38210549
1 changed files with 102 additions and 22 deletions
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124
mu4e/mu4e-headers.el
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@ -232,11 +232,39 @@ one of: `:date', `:subject', `:size', `:prio', `:from', `:to.',
(defvar mu4e-headers-unread-mark '("u" . "⎕") "Unread.")
;; thread prefix marks
(defvar mu4e-headers-has-child-prefix '("+" . "◼ ") "Parent.")
(defvar mu4e-headers-empty-parent-prefix '("-" . "◽ ") "Orphan.")
(defvar mu4e-headers-first-child-prefix '("\\" . "┗▶") "First child.")
(defvar mu4e-headers-duplicate-prefix '("=" . "≡ ") "Duplicate.")
(defvar mu4e-headers-default-prefix '("|" . "│ ") "Default.")
(defvar mu4e-headers-thread-child-prefix '("├>" . "┣▶ ")
"Prefix for messages in sub threads that do have a following sibling.
This variable is only used when mu4e-headers-new-thread-style is non-nil.")
(defvar mu4e-headers-thread-last-child-prefix '("└>" . "┗▶ ")
"Prefix for messages in sub threads that do not have a following sibling.
This variable is only used when mu4e-headers-new-thread-style is non-nil.")
(defvar mu4e-headers-thread-connection-prefix '("│" . "┃ ")
"Prefix to connect sibling messages that do not follow each other.
This prefix should have the same length as `mu4e-headers-thread-blank-prefix'.
This variable is only used when mu4e-headers-new-thread-style is non-nil.")
(defvar mu4e-headers-thread-blank-prefix '(" " . " ")
"Prefix to separate non connected messages.
This prefix should have the same length as `mu4e-headers-thread-connection-prefix'.
This variable is only used when mu4e-headers-new-thread-style is non-nil.")
(defvar mu4e-headers-thread-orphan-prefix '("" . "")
"Prefix for orphan messages.
This variable is only used when mu4e-headers-new-thread-style is non-nil.")
(defvar mu4e-headers-thread-duplicate-prefix '("=" . "≡ ")
"Prefix for duplicate messages.
This variable is only used when mu4e-headers-new-thread-style is non-nil.")
(defvar mu4e-headers-actions
'( ("capture message" . mu4e-action-capture-message)
@ -411,26 +439,78 @@ into a string."
(or name email "?"))) contacts ", "))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defsubst mu4e~headers-thread-prefix-map (type)
"Return the thread prefix based on the symbol TYPE."
(let ((get-prefix
(lambda (cell)
(if mu4e-use-fancy-chars (cdr cell) (car cell)))))
(case type
('child (funcall get-prefix mu4e-headers-thread-child-prefix))
('last-child (funcall get-prefix mu4e-headers-thread-last-child-prefix))
('connection (funcall get-prefix mu4e-headers-thread-connection-prefix))
('blank (funcall get-prefix mu4e-headers-thread-blank-prefix))
('orphan (funcall get-prefix mu4e-headers-thread-orphan-prefix))
('duplicate (funcall get-prefix mu4e-headers-thread-duplicate-prefix))
(t "?"))))
;; In order to print a thread tree with all the message connections,
;; it's necessary to keep track of all sub levels that still have
;; following messages. For each level, mu4e~headers-thread-state keeps
;; the value t for a connection or nil otherwise.
(defvar-local mu4e~headers-thread-state '())
(defsubst mu4e~headers-thread-prefix (thread)
"Calculate the thread prefix based on thread info THREAD."
(when thread
(let ((get-prefix
(lambda (cell) (if mu4e-use-fancy-chars (cdr cell) (car cell)))))
(concat
(make-string (* (if (plist-get thread :empty-parent) 0 1)
(plist-get thread :level)) ?\s)
(cond
((plist-get thread :has-child)
(funcall get-prefix mu4e-headers-has-child-prefix))
((plist-get thread :empty-parent)
(funcall get-prefix mu4e-headers-empty-parent-prefix))
((plist-get thread :first-child)
(funcall get-prefix mu4e-headers-first-child-prefix))
((plist-get thread :duplicate)
(funcall get-prefix mu4e-headers-duplicate-prefix))
(t
(funcall get-prefix mu4e-headers-default-prefix)))
" "))))
(let ((prefix "")
(level (plist-get thread :level))
(has-child (plist-get thread :has-child))
(empty-parent (plist-get thread :empty-parent))
(first-child (plist-get thread :first-child))
(last-child (plist-get thread :last-child))
(duplicate (plist-get thread :duplicate)))
;; Do not prefix root messages.
(if (or (= level 0) empty-parent)
(setq mu4e~headers-thread-state '()))
(if (> level 0)
(let* ((length (length mu4e~headers-thread-state))
(padding (make-list (max 0 (- level length)) nil)))
;; Trim and pad the state to ensure a message will
;; always be shown with the correct identation, even if
;; a broken thread is returned. It's trimmed to level-1
;; because the current level has always an connection
;; and it used a special formatting.
(setq mu4e~headers-thread-state
(subseq (append mu4e~headers-thread-state padding)
0 (- level 1)))
;; Prepare the thread prefix.
(setq prefix
(concat
;; Current mu4e~headers-thread-state, composed by
;; connections or blanks.
(mapconcat
(lambda (s)
(if s (mu4e~headers-thread-prefix-map 'connection)
(mu4e~headers-thread-prefix-map 'blank)))
mu4e~headers-thread-state "")
;; Current entry.
(if last-child (mu4e~headers-thread-prefix-map 'last-child)
(mu4e~headers-thread-prefix-map 'child))))))
;; If a new sub-thread will follow (has-child) and the current
;; one is still not done (not last-child), then a new
;; connection needs to be added to the tree-state. It's not
;; necessary to a blank (nil), because padding will handle
;; that.
(if (and has-child (not last-child))
(setq mu4e~headers-thread-state
(append mu4e~headers-thread-state '(t))))
;; Return the thread prefix.
(format "%s%s%s"
prefix
(if empty-parent
(mu4e~headers-thread-prefix-map 'orphan) "")
(if duplicate
(mu4e~headers-thread-prefix-map 'duplicate) "")))))
(defsubst mu4e~headers-flags-str (flags)
"Get a display string for the flags.