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545 lines
17 KiB
EmacsLisp
545 lines
17 KiB
EmacsLisp
;;; gnus-spec.el --- format spec functions for Gnus
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;; Copyright (C) 1996,97,98 Free Software Foundation, Inc.
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;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
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;; Keywords: news
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;;; Code:
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(eval-when-compile (require 'cl))
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(eval-when-compile (require 'cl))
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(require 'gnus)
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;;; Internal variables.
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(defvar gnus-summary-mark-positions nil)
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(defvar gnus-group-mark-positions nil)
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(defvar gnus-group-indentation "")
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;; Format specs. The chunks below are the machine-generated forms
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;; that are to be evaled as the result of the default format strings.
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;; We write them in here to get them byte-compiled. That way the
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;; default actions will be quite fast, while still retaining the full
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;; flexibility of the user-defined format specs.
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;; First we have lots of dummy defvars to let the compiler know these
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;; are really dynamic variables.
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(defvar gnus-tmp-unread)
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(defvar gnus-tmp-replied)
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(defvar gnus-tmp-score-char)
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(defvar gnus-tmp-indentation)
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(defvar gnus-tmp-opening-bracket)
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(defvar gnus-tmp-lines)
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(defvar gnus-tmp-name)
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(defvar gnus-tmp-closing-bracket)
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(defvar gnus-tmp-subject-or-nil)
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(defvar gnus-tmp-subject)
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(defvar gnus-tmp-marked)
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(defvar gnus-tmp-marked-mark)
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(defvar gnus-tmp-subscribed)
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(defvar gnus-tmp-process-marked)
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(defvar gnus-tmp-number-of-unread)
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(defvar gnus-tmp-group-name)
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(defvar gnus-tmp-group)
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(defvar gnus-tmp-article-number)
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(defvar gnus-tmp-unread-and-unselected)
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(defvar gnus-tmp-news-method)
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(defvar gnus-tmp-news-server)
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(defvar gnus-tmp-article-number)
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(defvar gnus-mouse-face)
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(defvar gnus-mouse-face-prop)
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(defun gnus-summary-line-format-spec ()
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(insert gnus-tmp-unread gnus-tmp-replied
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gnus-tmp-score-char gnus-tmp-indentation)
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(gnus-put-text-property
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(point)
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(progn
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(insert
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gnus-tmp-opening-bracket
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(format "%4d: %-20s"
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gnus-tmp-lines
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(if (> (length gnus-tmp-name) 20)
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(substring gnus-tmp-name 0 20)
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gnus-tmp-name))
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gnus-tmp-closing-bracket)
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(point))
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gnus-mouse-face-prop gnus-mouse-face)
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(insert " " gnus-tmp-subject-or-nil "\n"))
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(defvar gnus-summary-line-format-spec
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(gnus-byte-code 'gnus-summary-line-format-spec))
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(defun gnus-summary-dummy-line-format-spec ()
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(insert "* ")
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(gnus-put-text-property
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(point)
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(progn
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(insert ": :")
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(point))
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gnus-mouse-face-prop gnus-mouse-face)
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(insert " " gnus-tmp-subject "\n"))
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(defvar gnus-summary-dummy-line-format-spec
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(gnus-byte-code 'gnus-summary-dummy-line-format-spec))
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(defun gnus-group-line-format-spec ()
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(insert gnus-tmp-marked-mark gnus-tmp-subscribed
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gnus-tmp-process-marked
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gnus-group-indentation
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(format "%5s: " gnus-tmp-number-of-unread))
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(gnus-put-text-property
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(point)
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(progn
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(insert gnus-tmp-group "\n")
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(1- (point)))
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gnus-mouse-face-prop gnus-mouse-face))
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(defvar gnus-group-line-format-spec
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(gnus-byte-code 'gnus-group-line-format-spec))
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(defvar gnus-format-specs
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`((version . ,emacs-version)
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(group "%M\%S\%p\%P\%5y: %(%g%)%l\n" ,gnus-group-line-format-spec)
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(summary-dummy "* %(: :%) %S\n"
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,gnus-summary-dummy-line-format-spec)
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(summary "%U\%R\%z\%I\%(%[%4L: %-20,20n%]%) %s\n"
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,gnus-summary-line-format-spec))
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"Alist of format specs.")
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(defvar gnus-article-mode-line-format-spec nil)
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(defvar gnus-summary-mode-line-format-spec nil)
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(defvar gnus-group-mode-line-format-spec nil)
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;;; Phew. All that gruft is over, fortunately.
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;;;###autoload
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(defun gnus-update-format (var)
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"Update the format specification near point."
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(interactive
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(list
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(save-excursion
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(eval-defun nil)
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;; Find the end of the current word.
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(re-search-forward "[ \t\n]" nil t)
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;; Search backward.
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(when (re-search-backward "\\(gnus-[-a-z]+-line-format\\)" nil t)
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(match-string 1)))))
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(let* ((type (intern (progn (string-match "gnus-\\([-a-z]+\\)-line" var)
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(match-string 1 var))))
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(entry (assq type gnus-format-specs))
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value spec)
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(when entry
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(setq gnus-format-specs (delq entry gnus-format-specs)))
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(set
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(intern (format "%s-spec" var))
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(gnus-parse-format (setq value (symbol-value (intern var)))
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(symbol-value (intern (format "%s-alist" var)))
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(not (string-match "mode" var))))
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(setq spec (symbol-value (intern (format "%s-spec" var))))
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(push (list type value spec) gnus-format-specs)
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(pop-to-buffer "*Gnus Format*")
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(erase-buffer)
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(lisp-interaction-mode)
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(insert (pp-to-string spec))))
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(defun gnus-update-format-specifications (&optional force &rest types)
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"Update all (necessary) format specifications."
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;; Make the indentation array.
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;; See whether all the stored info needs to be flushed.
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(when (or force
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(not (equal emacs-version
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(cdr (assq 'version gnus-format-specs)))))
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(setq gnus-format-specs nil))
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;; Go through all the formats and see whether they need updating.
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(let (new-format entry type val)
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(while (setq type (pop types))
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;; Jump to the proper buffer to find out the value of
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;; the variable, if possible. (It may be buffer-local.)
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(save-excursion
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(let ((buffer (intern (format "gnus-%s-buffer" type)))
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val)
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(when (and (boundp buffer)
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(setq val (symbol-value buffer))
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(gnus-buffer-exists-p val))
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(set-buffer val))
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(setq new-format (symbol-value
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(intern (format "gnus-%s-line-format" type)))))
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(setq entry (cdr (assq type gnus-format-specs)))
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(if (and (car entry)
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(equal (car entry) new-format))
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;; Use the old format.
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(set (intern (format "gnus-%s-line-format-spec" type))
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(cadr entry))
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;; This is a new format.
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(setq val
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(if (not (stringp new-format))
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;; This is a function call or something.
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new-format
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;; This is a "real" format.
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(gnus-parse-format
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new-format
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(symbol-value
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(intern (format "gnus-%s-line-format-alist"
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(if (eq type 'article-mode)
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'summary-mode type))))
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(not (string-match "mode$" (symbol-name type))))))
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;; Enter the new format spec into the list.
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(if entry
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(progn
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(setcar (cdr entry) val)
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(setcar entry new-format))
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(push (list type new-format val) gnus-format-specs))
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(set (intern (format "gnus-%s-line-format-spec" type)) val)))))
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(unless (assq 'version gnus-format-specs)
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(push (cons 'version emacs-version) gnus-format-specs)))
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(defvar gnus-mouse-face-0 'highlight)
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(defvar gnus-mouse-face-1 'highlight)
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(defvar gnus-mouse-face-2 'highlight)
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(defvar gnus-mouse-face-3 'highlight)
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(defvar gnus-mouse-face-4 'highlight)
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(defun gnus-mouse-face-function (form type)
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`(gnus-put-text-property
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(point) (progn ,@form (point))
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gnus-mouse-face-prop
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,(if (equal type 0)
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'gnus-mouse-face
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`(quote ,(symbol-value (intern (format "gnus-mouse-face-%d" type)))))))
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(defvar gnus-face-0 'bold)
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(defvar gnus-face-1 'italic)
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(defvar gnus-face-2 'bold-italic)
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(defvar gnus-face-3 'bold)
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(defvar gnus-face-4 'bold)
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(defun gnus-face-face-function (form type)
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`(gnus-add-text-properties
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(point) (progn ,@form (point))
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'(gnus-face t face ,(symbol-value (intern (format "gnus-face-%d" type))))))
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(defun gnus-tilde-max-form (el max-width)
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"Return a form that limits EL to MAX-WIDTH."
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(let ((max (abs max-width)))
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(if (symbolp el)
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`(if (> (length ,el) ,max)
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,(if (< max-width 0)
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`(substring ,el (- (length el) ,max))
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`(substring ,el 0 ,max))
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,el)
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`(let ((val (eval ,el)))
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(if (> (length val) ,max)
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,(if (< max-width 0)
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`(substring val (- (length val) ,max))
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`(substring val 0 ,max))
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val)))))
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(defun gnus-tilde-cut-form (el cut-width)
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"Return a form that cuts CUT-WIDTH off of EL."
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(let ((cut (abs cut-width)))
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(if (symbolp el)
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`(if (> (length ,el) ,cut)
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,(if (< cut-width 0)
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`(substring ,el 0 (- (length el) ,cut))
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`(substring ,el ,cut))
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,el)
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`(let ((val (eval ,el)))
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(if (> (length val) ,cut)
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,(if (< cut-width 0)
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`(substring val 0 (- (length val) ,cut))
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`(substring val ,cut))
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val)))))
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(defun gnus-tilde-ignore-form (el ignore-value)
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"Return a form that is blank when EL is IGNORE-VALUE."
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(if (symbolp el)
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`(if (equal ,el ,ignore-value)
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"" ,el)
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`(let ((val (eval ,el)))
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(if (equal val ,ignore-value)
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"" val))))
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(defun gnus-parse-format (format spec-alist &optional insert)
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;; This function parses the FORMAT string with the help of the
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;; SPEC-ALIST and returns a list that can be eval'ed to return the
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;; string. If the FORMAT string contains the specifiers %( and %)
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;; the text between them will have the mouse-face text property.
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(if (string-match
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"\\`\\(.*\\)%[0-9]?[{(]\\(.*\\)%[0-9]?[})]\\(.*\n?\\)\\'"
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format)
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(gnus-parse-complex-format format spec-alist)
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;; This is a simple format.
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(gnus-parse-simple-format format spec-alist insert)))
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(defun gnus-parse-complex-format (format spec-alist)
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(save-excursion
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(gnus-set-work-buffer)
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(insert format)
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(goto-char (point-min))
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(while (re-search-forward "\"" nil t)
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(replace-match "\\\"" nil t))
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(goto-char (point-min))
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(insert "(\"")
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(while (re-search-forward "%\\([0-9]+\\)?\\([{}()]\\)" nil t)
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(let ((number (if (match-beginning 1)
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(match-string 1) "0"))
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(delim (aref (match-string 2) 0)))
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(if (or (= delim ?\()
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(= delim ?\{))
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(replace-match (concat "\"(" (if (= delim ?\() "mouse" "face")
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" " number " \""))
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(replace-match "\")\""))))
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(goto-char (point-max))
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(insert "\")")
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(goto-char (point-min))
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(let ((form (read (current-buffer))))
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(cons 'progn (gnus-complex-form-to-spec form spec-alist)))))
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(defun gnus-complex-form-to-spec (form spec-alist)
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(delq nil
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(mapcar
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(lambda (sform)
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(if (stringp sform)
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(gnus-parse-simple-format sform spec-alist t)
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(funcall (intern (format "gnus-%s-face-function" (car sform)))
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(gnus-complex-form-to-spec (cddr sform) spec-alist)
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(nth 1 sform))))
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form)))
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(defun gnus-parse-simple-format (format spec-alist &optional insert)
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;; This function parses the FORMAT string with the help of the
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;; SPEC-ALIST and returns a list that can be eval'ed to return a
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;; string.
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(let ((max-width 0)
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spec flist fstring elem result dontinsert user-defined
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type value pad-width spec-beg cut-width ignore-value
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tilde-form tilde elem-type)
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(save-excursion
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(gnus-set-work-buffer)
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(insert format)
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(goto-char (point-min))
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(while (re-search-forward "%" nil t)
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(setq user-defined nil
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spec-beg nil
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pad-width nil
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max-width nil
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cut-width nil
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ignore-value nil
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tilde-form nil)
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(setq spec-beg (1- (point)))
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;; Parse this spec fully.
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(while
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(cond
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((looking-at "\\([-.0-9]+\\)\\(,[-0-9]+\\)?")
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(setq pad-width (string-to-number (match-string 1)))
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(when (match-beginning 2)
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(setq max-width (string-to-number (buffer-substring
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(1+ (match-beginning 2))
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(match-end 2)))))
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(goto-char (match-end 0)))
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((looking-at "~")
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(forward-char 1)
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(setq tilde (read (current-buffer))
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type (car tilde)
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value (cadr tilde))
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(cond
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((memq type '(pad pad-left))
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(setq pad-width value))
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((eq type 'pad-right)
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(setq pad-width (- value)))
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((memq type '(max-right max))
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(setq max-width value))
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((eq type 'max-left)
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(setq max-width (- value)))
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((memq type '(cut cut-left))
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(setq cut-width value))
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((eq type 'cut-right)
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(setq cut-width (- value)))
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((eq type 'ignore)
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(setq ignore-value
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(if (stringp value) value (format "%s" value))))
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((eq type 'form)
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(setq tilde-form value))
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(t
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(error "Unknown tilde type: %s" tilde)))
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t)
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(t
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nil)))
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;; User-defined spec -- find the spec name.
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(when (= (setq spec (following-char)) ?u)
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(forward-char 1)
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(setq user-defined (following-char)))
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(forward-char 1)
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(delete-region spec-beg (point))
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;; Now we have all the relevant data on this spec, so
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;; we start doing stuff.
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(insert "%")
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(if (eq spec ?%)
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;; "%%" just results in a "%".
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(insert "%")
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(cond
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;; Do tilde forms.
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((eq spec ?@)
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(setq elem (list tilde-form ?s)))
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;; Treat user defined format specifiers specially.
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(user-defined
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(setq elem
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(list
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(list (intern (format "gnus-user-format-function-%c"
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user-defined))
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'gnus-tmp-header)
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?s)))
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;; Find the specification from `spec-alist'.
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((setq elem (cdr (assq spec spec-alist))))
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(t
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(setq elem '("*" ?s))))
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(setq elem-type (cadr elem))
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;; Insert the new format elements.
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(when pad-width
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(insert (number-to-string pad-width)))
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;; Create the form to be evaled.
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(if (or max-width cut-width ignore-value)
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(progn
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(insert ?s)
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(let ((el (car elem)))
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(cond ((= (cadr elem) ?c)
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(setq el (list 'char-to-string el)))
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((= (cadr elem) ?d)
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(setq el (list 'int-to-string el))))
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(when ignore-value
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(setq el (gnus-tilde-ignore-form el ignore-value)))
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(when cut-width
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(setq el (gnus-tilde-cut-form el cut-width)))
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(when max-width
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(setq el (gnus-tilde-max-form el max-width)))
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(push el flist)))
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(insert elem-type)
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(push (car elem) flist))))
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(setq fstring (buffer-string)))
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;; Do some postprocessing to increase efficiency.
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(setq
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result
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(cond
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;; Emptyness.
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((string= fstring "")
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nil)
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;; Not a format string.
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((not (string-match "%" fstring))
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(list fstring))
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;; A format string with just a single string spec.
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((string= fstring "%s")
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(list (car flist)))
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;; A single character.
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((string= fstring "%c")
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(list (car flist)))
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;; A single number.
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((string= fstring "%d")
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(setq dontinsert)
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(if insert
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(list `(princ ,(car flist)))
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(list `(int-to-string ,(car flist)))))
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;; Just lots of chars and strings.
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((string-match "\\`\\(%[cs]\\)+\\'" fstring)
|
|
(nreverse flist))
|
|
;; A single string spec at the beginning of the spec.
|
|
((string-match "\\`%[sc][^%]+\\'" fstring)
|
|
(list (car flist) (substring fstring 2)))
|
|
;; A single string spec in the middle of the spec.
|
|
((string-match "\\`\\([^%]+\\)%[sc]\\([^%]+\\)\\'" fstring)
|
|
(list (match-string 1 fstring) (car flist) (match-string 2 fstring)))
|
|
;; A single string spec in the end of the spec.
|
|
((string-match "\\`\\([^%]+\\)%[sc]\\'" fstring)
|
|
(list (match-string 1 fstring) (car flist)))
|
|
;; A more complex spec.
|
|
(t
|
|
(list (cons 'format (cons fstring (nreverse flist)))))))
|
|
|
|
(if insert
|
|
(when result
|
|
(if dontinsert
|
|
result
|
|
(cons 'insert result)))
|
|
(cond ((stringp result)
|
|
result)
|
|
((consp result)
|
|
(cons 'concat result))
|
|
(t "")))))
|
|
|
|
(defun gnus-eval-format (format &optional alist props)
|
|
"Eval the format variable FORMAT, using ALIST.
|
|
If PROPS, insert the result."
|
|
(let ((form (gnus-parse-format format alist props)))
|
|
(if props
|
|
(gnus-add-text-properties (point) (progn (eval form) (point)) props)
|
|
(eval form))))
|
|
|
|
(defun gnus-compile ()
|
|
"Byte-compile the user-defined format specs."
|
|
(interactive)
|
|
(require 'bytecomp)
|
|
(let ((entries gnus-format-specs)
|
|
(byte-compile-warnings '(unresolved callargs redefine))
|
|
entry gnus-tmp-func)
|
|
(save-excursion
|
|
(gnus-message 7 "Compiling format specs...")
|
|
|
|
(while entries
|
|
(setq entry (pop entries))
|
|
(if (eq (car entry) 'version)
|
|
(setq gnus-format-specs (delq entry gnus-format-specs))
|
|
(let ((form (caddr entry)))
|
|
(when (and (listp form)
|
|
;; Under GNU Emacs, it's (byte-code ...)
|
|
(not (eq 'byte-code (car form)))
|
|
;; Under XEmacs, it's (funcall #<compiled-function ...>)
|
|
(not (and (eq 'funcall (car form))
|
|
(compiled-function-p (cadr form)))))
|
|
(fset 'gnus-tmp-func `(lambda () ,form))
|
|
(byte-compile 'gnus-tmp-func)
|
|
(setcar (cddr entry) (gnus-byte-code 'gnus-tmp-func))))))
|
|
|
|
(push (cons 'version emacs-version) gnus-format-specs)
|
|
;; Mark the .newsrc.eld file as "dirty".
|
|
(gnus-dribble-touch)
|
|
(gnus-message 7 "Compiling user specs...done"))))
|
|
|
|
(defun gnus-set-format (type &optional insertable)
|
|
(set (intern (format "gnus-%s-line-format-spec" type))
|
|
(gnus-parse-format
|
|
(symbol-value (intern (format "gnus-%s-line-format" type)))
|
|
(symbol-value (intern (format "gnus-%s-line-format-alist" type)))
|
|
insertable)))
|
|
|
|
|
|
(provide 'gnus-spec)
|
|
|
|
;;; gnus-spec.el ends here
|