mirror of
https://git.notmuchmail.org/git/notmuch
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01ec4d3bcb
Add:
- notmuch-wash-wrap-long-lines: Wrap lines longer than the width of
the current window whilst maintaining any citation prefix.
- notmuch-wash-tidy-citations: Tidy up citations by:
- compress repeated otherwise blank citation lines,
- remove otherwise blank citation lines at the head and tail of a
citation,
- notmuch-wash-elide-blank-lines: Compress repeated blank lines and
remove leading and trailing blank lines.
None of these is enabled by default - add them to
`notmuch-show-insert-text/plain-hook' to use.
Reviewed-by: Carl Worth <cworth@cworth.org>: I previously committed a
stale version of this patch.
234 lines
8.1 KiB
EmacsLisp
234 lines
8.1 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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;;
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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-signature-button-format
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"[ %d-line signature. Click/Enter to toggle visibility. ]"
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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-citation-button-format
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"[ %d more citation lines. Click/Enter to toggle visibility. ]"
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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-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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(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-region-to-button (beg end type prefix button-text)
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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. BUTTON-TEXT
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is what to put on the button."
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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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(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 button-text
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'invisibility-spec invis-spec
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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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(format notmuch-wash-citation-button-format
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(- cite-lines
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notmuch-wash-citation-lines-prefix
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notmuch-wash-citation-lines-suffix)))))))
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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 (1- (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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(format notmuch-wash-signature-button-format sig-lines)))))))
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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 four 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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(provide 'notmuch-wash)
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