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;; notmuch-jump.el --- User-friendly shortcut keys
;;
;; Copyright © Austin Clements
;;
;; This file is part of Notmuch.
;;
;; Notmuch is free software: you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;;
;; Notmuch is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;; General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with Notmuch. If not, see <http://www.gnu.org/licenses/>.
;;
;; Authors: Austin Clements <aclements@csail.mit.edu>
;; David Edmondson <dme@dme.org>
(eval-when-compile (require 'cl))
(require 'notmuch-lib)
(require 'notmuch-hello)
(eval-and-compile
(unless (fboundp 'window-body-width)
;; Compatibility for Emacs pre-24
(defalias 'window-body-width 'window-width)))
;;;###autoload
(defun notmuch-jump-search ()
"Jump to a saved search by shortcut key.
This prompts for and performs a saved search using the shortcut
keys configured in the :key property of `notmuch-saved-searches'.
Typically these shortcuts are a single key long, so this is a
fast way to jump to a saved search from anywhere in Notmuch."
(interactive)
;; Build the action map
(let (action-map)
(dolist (saved-search notmuch-saved-searches)
(let* ((saved-search (notmuch-hello-saved-search-to-plist saved-search))
(key (plist-get saved-search :key)))
(when key
(let ((name (plist-get saved-search :name))
(query (plist-get saved-search :query))
(oldest-first
(case (plist-get saved-search :sort-order)
(newest-first nil)
(oldest-first t)
(otherwise (default-value 'notmuch-search-oldest-first)))))
(push (list key name
`(lambda () (notmuch-search ',query ',oldest-first)))
action-map)))))
(setq action-map (nreverse action-map))
(if action-map
(notmuch-jump action-map "Search: ")
(error "To use notmuch-jump, please customize shortcut keys in notmuch-saved-searches."))))
(defvar notmuch-jump--action nil)
(defun notmuch-jump (action-map prompt)
"Interactively prompt for one of the keys in ACTION-MAP.
Displays a summary of all bindings in ACTION-MAP in the
minibuffer, reads a key from the minibuffer, and performs the
corresponding action. The prompt can be canceled with C-g or
RET. PROMPT must be a string to use for the prompt. PROMPT
should include a space at the end.
ACTION-MAP must be a list of triples of the form
(KEY LABEL ACTION)
where KEY is a key binding, LABEL is a string label to display in
the buffer, and ACTION is a nullary function to call. LABEL may
be null, in which case the action will still be bound, but will
not appear in the pop-up buffer.
"
(let* ((items (notmuch-jump--format-actions action-map))
;; Format the table of bindings and the full prompt
(table
(with-temp-buffer
(notmuch-jump--insert-items (window-body-width) items)
(buffer-string)))
(full-prompt
(concat table "\n\n"
(propertize prompt 'face 'minibuffer-prompt)))
;; By default, the minibuffer applies the minibuffer face to
;; the entire prompt. However, we want to clearly
;; distinguish bindings (which we put in the prompt face
;; ourselves) from their labels, so disable the minibuffer's
;; own re-face-ing.
(minibuffer-prompt-properties
(notmuch-plist-delete
(copy-sequence minibuffer-prompt-properties)
'face))
;; Build the keymap with our bindings
(minibuffer-map (notmuch-jump--make-keymap action-map))
;; The bindings save the the action in notmuch-jump--action
(notmuch-jump--action nil))
;; Read the action
(read-from-minibuffer full-prompt nil minibuffer-map)
;; If we got an action, do it
(when notmuch-jump--action
(funcall notmuch-jump--action))))
(defun notmuch-jump--format-actions (action-map)
"Format the actions in ACTION-MAP.
Returns a list of strings, one for each item with a label in
ACTION-MAP. These strings can be inserted into a tabular
buffer."
;; Compute the maximum key description width
(let ((key-width 1))
(dolist (entry action-map)
(setq key-width
(max key-width
(string-width (format-kbd-macro (first entry))))))
;; Format each action
(mapcar (lambda (entry)
(let ((key (format-kbd-macro (first entry)))
(desc (second entry)))
(concat
(propertize key 'face 'minibuffer-prompt)
(make-string (- key-width (length key)) ? )
" " desc)))
action-map)))
(defun notmuch-jump--insert-items (width items)
"Make a table of ITEMS up to WIDTH wide in the current buffer."
(let* ((nitems (length items))
(col-width (+ 3 (apply #'max (mapcar #'string-width items))))
(ncols (if (> (* col-width nitems) width)
(max 1 (/ width col-width))
;; Items fit on one line. Space them out
(setq col-width (/ width nitems))
(length items))))
(while items
(dotimes (col ncols)
(when items
(let ((item (pop items)))
(insert item)
(when (and items (< col (- ncols 1)))
(insert (make-string (- col-width (string-width item)) ? ))))))
(when items
(insert "\n")))))
(defvar notmuch-jump-minibuffer-map
(let ((map (make-sparse-keymap)))
(set-keymap-parent map minibuffer-local-map)
;; Make this like a special-mode keymap, with no self-insert-command
(suppress-keymap map)
map)
"Base keymap for notmuch-jump's minibuffer keymap.")
(defun notmuch-jump--make-keymap (action-map)
"Translate ACTION-MAP into a minibuffer keymap."
(let ((map (make-sparse-keymap)))
(set-keymap-parent map notmuch-jump-minibuffer-map)
(dolist (action action-map)
(define-key map (first action)
`(lambda () (interactive)
(setq notmuch-jump--action ',(third action))
(exit-minibuffer))))
map))
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