mirror of
https://git.notmuchmail.org/git/notmuch
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40de245862
Before the change, citation and signature wash buttons used the same label in both visible and hidden states. Sometimes it is very convenient when you can determine if the text is hidden or shown without reading the context and/or clicking the button. The patch makes it easy to see if the text is shown or hidden by explicitly saying what the button does (shows or hides the text).
297 lines
10 KiB
EmacsLisp
297 lines
10 KiB
EmacsLisp
;; notmuch-wash.el --- cleaning up message bodies
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;;
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;; Copyright © Carl Worth
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;; Copyright © David Edmondson
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;;
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;; This file is part of Notmuch.
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;;
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;; Notmuch is free software: you can redistribute it and/or modify it
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;; under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;;
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;; Notmuch is distributed in the hope that it will be useful, but
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;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with Notmuch. If not, see <http://www.gnu.org/licenses/>.
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;;
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;; Authors: Carl Worth <cworth@cworth.org>
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;; David Edmondson <dme@dme.org>
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(require 'coolj)
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(declare-function notmuch-show-insert-bodypart "notmuch-show" (msg part depth))
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;;
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(defvar notmuch-wash-signature-regexp
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"^\\(-- ?\\|_+\\)$"
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"Pattern to match a line that separates content from signature.")
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(defvar notmuch-wash-citation-regexp
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"\\(^[[:space:]]*>.*\n\\)+"
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"Pattern to match citation lines.")
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(defvar notmuch-wash-button-signature-hidden-format
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"[ %d-line signature. Click/Enter to show. ]"
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"String used to construct button text for hidden signatures.
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Can use up to one integer format parameter, i.e. %d")
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(defvar notmuch-wash-button-signature-visible-format
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"[ %d-line signature. Click/Enter to hide. ]"
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"String used to construct button text for visible signatures.
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Can use up to one integer format parameter, i.e. %d")
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(defvar notmuch-wash-button-citation-hidden-format
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"[ %d more citation lines. Click/Enter to show. ]"
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"String used to construct button text for hidden citations.
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Can use up to one integer format parameter, i.e. %d")
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(defvar notmuch-wash-button-citation-visible-format
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"[ %d more citation lines. Click/Enter to hide. ]"
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"String used to construct button text for visible citations.
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Can use up to one integer format parameter, i.e. %d")
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(defvar notmuch-wash-signature-lines-max 12
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"Maximum length of signature that will be hidden by default.")
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(defvar notmuch-wash-citation-lines-prefix 3
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"Always show at least this many lines from the start of a citation.
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If there is one more line than the sum of
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`notmuch-wash-citation-lines-prefix' and
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`notmuch-wash-citation-lines-suffix', show that, otherwise
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collapse the remaining lines into a button.")
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(defvar notmuch-wash-citation-lines-suffix 3
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"Always show at least this many lines from the end of a citation.
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If there is one more line than the sum of
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`notmuch-wash-citation-lines-prefix' and
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`notmuch-wash-citation-lines-suffix', show that, otherwise
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collapse the remaining lines into a button.")
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(defun notmuch-wash-toggle-invisible-action (cite-button)
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(let ((invis-spec (button-get cite-button 'invisibility-spec)))
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(if (invisible-p invis-spec)
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(remove-from-invisibility-spec invis-spec)
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(add-to-invisibility-spec invis-spec)))
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(let* ((new-start (button-start cite-button))
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(overlay (button-get cite-button 'overlay))
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(button-label (notmuch-wash-button-label overlay))
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(inhibit-read-only t))
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(save-excursion
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(goto-char new-start)
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(insert button-label)
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(let ((old-end (button-end cite-button)))
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(move-overlay cite-button new-start (point))
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(delete-region (point) old-end))))
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(force-window-update)
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(redisplay t))
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(define-button-type 'notmuch-wash-button-invisibility-toggle-type
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'action 'notmuch-wash-toggle-invisible-action
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'follow-link t
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'face 'font-lock-comment-face)
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(define-button-type 'notmuch-wash-button-citation-toggle-type
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'help-echo "mouse-1, RET: Show citation"
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:supertype 'notmuch-wash-button-invisibility-toggle-type)
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(define-button-type 'notmuch-wash-button-signature-toggle-type
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'help-echo "mouse-1, RET: Show signature"
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:supertype 'notmuch-wash-button-invisibility-toggle-type)
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(defun notmuch-wash-region-isearch-show (overlay)
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(remove-from-invisibility-spec (overlay-get overlay 'invisible)))
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(defun notmuch-wash-button-label (overlay)
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(let* ((type (overlay-get overlay 'type))
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(invis-spec (overlay-get overlay 'invisible))
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(state (if (invisible-p invis-spec) "hidden" "visible"))
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(label-format (symbol-value (intern-soft (concat "notmuch-wash-button-"
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type "-" state "-format"))))
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(lines-count (count-lines (overlay-start overlay) (overlay-end overlay))))
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(format label-format lines-count)))
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(defun notmuch-wash-region-to-button (beg end type prefix)
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"Auxilary function to do the actual making of overlays and buttons
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BEG and END are buffer locations. TYPE should a string, either
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\"citation\" or \"signature\". PREFIX is some arbitrary text to
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insert before the button, probably for indentation."
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;; This uses some slightly tricky conversions between strings and
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;; symbols because of the way the button code works. Note that
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;; replacing intern-soft with make-symbol will cause this to fail,
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;; since the newly created symbol has no plist.
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(let ((overlay (make-overlay beg end))
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(invis-spec (make-symbol (concat "notmuch-" type "-region")))
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(button-type (intern-soft (concat "notmuch-wash-button-"
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type "-toggle-type"))))
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(add-to-invisibility-spec invis-spec)
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(overlay-put overlay 'invisible invis-spec)
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(overlay-put overlay 'isearch-open-invisible #'notmuch-wash-region-isearch-show)
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(overlay-put overlay 'type type)
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(goto-char (1+ end))
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(save-excursion
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(goto-char (1- beg))
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(insert prefix)
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(insert-button (notmuch-wash-button-label overlay)
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'invisibility-spec invis-spec
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'overlay overlay
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:type button-type))))
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(defun notmuch-wash-excerpt-citations (depth)
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"Excerpt citations and up to one signature."
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(goto-char (point-min))
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(beginning-of-line)
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(while (and (< (point) (point-max))
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(re-search-forward notmuch-wash-citation-regexp nil t))
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(let* ((cite-start (match-beginning 0))
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(cite-end (match-end 0))
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(cite-lines (count-lines cite-start cite-end)))
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(overlay-put (make-overlay cite-start cite-end) 'face 'message-cited-text-face)
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(when (> cite-lines (+ notmuch-wash-citation-lines-prefix
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notmuch-wash-citation-lines-suffix
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1))
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(goto-char cite-start)
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(forward-line notmuch-wash-citation-lines-prefix)
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(let ((hidden-start (point-marker)))
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(goto-char cite-end)
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(forward-line (- notmuch-wash-citation-lines-suffix))
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(notmuch-wash-region-to-button
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hidden-start (point-marker)
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"citation" "\n")))))
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(if (and (not (eobp))
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(re-search-forward notmuch-wash-signature-regexp nil t))
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(let* ((sig-start (match-beginning 0))
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(sig-end (match-end 0))
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(sig-lines (count-lines sig-start (point-max))))
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(if (<= sig-lines notmuch-wash-signature-lines-max)
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(let ((sig-start-marker (make-marker))
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(sig-end-marker (make-marker)))
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(set-marker sig-start-marker sig-start)
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(set-marker sig-end-marker (point-max))
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(overlay-put (make-overlay sig-start-marker sig-end-marker) 'face 'message-cited-text-face)
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(notmuch-wash-region-to-button
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sig-start-marker sig-end-marker
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"signature" "\n"))))))
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;;
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(defun notmuch-wash-elide-blank-lines (depth)
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"Elide leading, trailing and successive blank lines."
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;; Algorithm derived from `article-strip-multiple-blank-lines' in
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;; `gnus-art.el'.
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;; Make all blank lines empty.
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(goto-char (point-min))
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(while (re-search-forward "^[[:space:]\t]+$" nil t)
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(replace-match "" nil t))
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;; Replace multiple empty lines with a single empty line.
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(goto-char (point-min))
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(while (re-search-forward "^\n\\(\n+\\)" nil t)
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(delete-region (match-beginning 1) (match-end 1)))
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;; Remove a leading blank line.
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(goto-char (point-min))
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(if (looking-at "\n")
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(delete-region (match-beginning 0) (match-end 0)))
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;; Remove a trailing blank line.
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(goto-char (point-max))
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(if (looking-at "\n")
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(delete-region (match-beginning 0) (match-end 0))))
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;;
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(defun notmuch-wash-tidy-citations (depth)
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"Improve the display of cited regions of a message.
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Perform several transformations on the message body:
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- Remove lines of repeated citation leaders with no other
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content,
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- Remove citation leaders standing alone before a block of cited
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text,
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- Remove citation trailers standing alone after a block of cited
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text."
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;; Remove lines of repeated citation leaders with no other content.
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(goto-char (point-min))
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(while (re-search-forward "\\(^>[> ]*\n\\)\\{2,\\}" nil t)
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(replace-match "\\1"))
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;; Remove citation leaders standing alone before a block of cited
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;; text.
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(goto-char (point-min))
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(while (re-search-forward "\\(\n\\|^[^>].*\\)\n\\(^>[> ]*\n\\)" nil t)
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(replace-match "\\1\n"))
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;; Remove citation trailers standing alone after a block of cited
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;; text.
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(goto-char (point-min))
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(while (re-search-forward "\\(^>[> ]*\n\\)\\(^$\\|^[^>].*\\)" nil t)
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(replace-match "\\2")))
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;;
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(defun notmuch-wash-wrap-long-lines (depth)
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"Wrap any long lines in the message to the width of the window.
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When doing so, maintaining citation leaders in the wrapped text."
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(let ((coolj-wrap-follows-window-size nil)
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(fill-column (- (window-width)
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depth
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;; 2 to avoid poor interaction with
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;; `word-wrap'.
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2)))
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(coolj-wrap-region (point-min) (point-max))))
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;;
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(require 'diff-mode)
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(defvar diff-file-header-re) ; From `diff-mode.el'.
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(defun notmuch-wash-convert-inline-patch-to-part (depth)
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"Convert an inline patch into a fake 'text/x-diff' attachment.
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Given that this function guesses whether a buffer includes a
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patch and then guesses the extent of the patch, there is scope
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for error."
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(goto-char (point-min))
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(if (re-search-forward diff-file-header-re nil t)
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(progn
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(beginning-of-line -1)
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(let ((patch-start (point))
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(patch-end (point-max))
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part)
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(goto-char patch-start)
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(if (or
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;; Patch ends with signature.
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(re-search-forward notmuch-wash-signature-regexp nil t)
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;; Patch ends with bugtraq comment.
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(re-search-forward "^\\*\\*\\* " nil t))
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(setq patch-end (match-beginning 0)))
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(save-restriction
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(narrow-to-region patch-start patch-end)
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(setq part (plist-put part :content-type "text/x-diff"))
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(setq part (plist-put part :content (buffer-string)))
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(setq part (plist-put part :id -1))
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(setq part (plist-put part :filename "inline patch"))
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(delete-region (point-min) (point-max))
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(notmuch-show-insert-bodypart nil part depth))))))
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;;
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(provide 'notmuch-wash)
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