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667 lines
21 KiB
EmacsLisp
667 lines
21 KiB
EmacsLisp
;;; gnus-spec.el --- format spec functions for Gnus -*- lexical-binding: t; -*-
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;; Copyright (C) 1996-2024 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 3 of the License, or
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;; (at your option) 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. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(eval-when-compile (require 'cl-lib))
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(defvar gnus-newsrc-file-version)
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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 evalled 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-mouse-face)
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(defvar gnus-tmp-header)
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(defvar gnus-tmp-from)
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(declare-function gnus-summary-from-or-to-or-newsgroups "gnus-sum"
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(header gnus-tmp-from))
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(defmacro gnus-lrm-string-p (string)
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;; LRM, RLM, PDF characters as integers to avoid breaking Emacs
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;; 23.
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`(memq (aref ,string (1- (length ,string))) '(8206 8207 8236)))
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(defvar gnus-lrm-string (if (ignore-errors (string 8206))
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(propertize (string 8206) 'invisible t)
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""))
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(defvar gnus-summary-line-format-spec nil)
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(defvar gnus-summary-dummy-line-format-spec nil)
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(defvar gnus-group-line-format-spec nil)
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(defvar gnus-format-specs
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`((version . ,emacs-version)
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(gnus-version . ,(gnus-continuum-version)))
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"Alist of format specs.")
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(defvar gnus-default-format-specs gnus-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 with, 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 (gnus-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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Return a list of updated types."
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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 gnus-newsrc-file-version)
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(not (equal (gnus-continuum-version)
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(gnus-continuum-version gnus-newsrc-file-version)))
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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 updated)
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(while (setq type (pop types))
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;; Jump to the proper buffer to find out the value of the
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;; variable, if possible. (It may be buffer-local.)
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(save-current-buffer
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(let ((buffer (intern (format "gnus-%s-buffer" type))))
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(when (and (boundp buffer)
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(setq val (symbol-value buffer))
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(gnus-buffer-live-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" 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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(push type updated))))
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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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updated))
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(defcustom gnus-mouse-face-0 'highlight
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"The \"%(hello%)\" face."
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:group 'gnus-format
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:type 'face)
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(defcustom gnus-mouse-face-1 'highlight
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"The \"%1(hello%)\" face."
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:group 'gnus-format
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:type 'face)
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(defcustom gnus-mouse-face-2 'highlight
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"The \"%2(hello%)\" face."
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:group 'gnus-format
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:type 'face)
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(defcustom gnus-mouse-face-3 'highlight
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"The \"%3(hello%)\" face."
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:group 'gnus-format
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:type 'face)
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(defcustom gnus-mouse-face-4 'highlight
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"The \"%4(hello%)\" face."
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:group 'gnus-format
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:type 'face)
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(defun gnus-mouse-face-function (form type)
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`(put-text-property
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(point) (progn ,@form (point))
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'mouse-face
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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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(defcustom gnus-face-0 'bold
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"The \"%{hello%}\" face."
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:group 'gnus-format
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:type 'face)
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(defcustom gnus-face-1 'italic
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"The \"%1{hello%}\" face."
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:group 'gnus-format
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:type 'face)
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(defcustom gnus-face-2 'bold-italic
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"The \"%2{hello%}\" face."
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:group 'gnus-format
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:type 'face)
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(defcustom gnus-face-3 'bold
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"The \"%3{hello%}\" face."
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:group 'gnus-format
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:type 'face)
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(defcustom gnus-face-4 'bold
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"The \"%4{hello%}\" face."
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:group 'gnus-format
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:type 'face)
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(defun gnus-face-face-function (form type)
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`(add-text-properties
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(point) (progn ,@form (point))
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(cons 'face
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(cons
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;; Delay consing the value of the `face' property until
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;; `add-text-properties' runs, since it will be modified
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;; by `put-text-property-excluding-characters-with-faces'.
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(list ',(symbol-value (intern (format "gnus-face-%d" type))) 'default)
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;; Redundant now, but still convenient.
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'(gnus-face t)))))
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(defun gnus-balloon-face-function (form type)
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`(put-text-property
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(point) (progn ,@form (point)) 'help-echo
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,(intern (format "gnus-balloon-face-%d" type))))
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(defun gnus-spec-tab (column)
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(if (> column 0)
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`(insert-char ? (max (- ,column (current-column)) 0))
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(let ((column (abs column)))
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`(if (> (current-column) ,column)
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(let ((end (point)))
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(if (= (move-to-column ,column) ,column)
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(delete-region (point) end)
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(delete-region (1- (point)) end)
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(insert " ")))
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(insert-char ? (max (- ,column (current-column)) 0))))))
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(define-obsolete-function-alias 'gnus-correct-length 'string-width "27.1")
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(defun gnus-correct-substring (string start &optional end)
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(let ((wstart 0)
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(wend 0)
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(wseek 0)
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(seek 0)
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(length (length string))
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(string (concat string "\0")))
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;; Find the start position.
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(while (and (< seek length)
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(< wseek start))
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(cl-incf wseek (char-width (aref string seek)))
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(cl-incf seek))
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(setq wstart seek)
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;; Find the end position.
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(while (and (<= seek length)
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(or (not end)
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(<= wseek end)))
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(cl-incf wseek (char-width (aref string seek)))
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(cl-incf seek))
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(setq wend seek)
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(substring string wstart (1- wend))))
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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 (> (string-width ,el) ,max)
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,(if (< max-width 0)
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`(gnus-correct-substring ,el (- (string-width ,el) ,max))
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`(if (gnus-lrm-string-p ,el)
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(concat (gnus-correct-substring ,el 0 ,max)
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,gnus-lrm-string)
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(gnus-correct-substring ,el 0 ,max)))
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,el)
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`(let ((val (eval ,el)))
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(if (> (string-width val) ,max)
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,(if (< max-width 0)
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`(gnus-correct-substring val (- (string-width val) ,max))
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`(if (gnus-lrm-string-p val)
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(concat (gnus-correct-substring val 0 ,max)
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,gnus-lrm-string)
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(gnus-correct-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 (> (string-width ,el) ,cut)
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,(if (< cut-width 0)
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`(gnus-correct-substring ,el 0 (- (string-width ,el) ,cut))
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`(gnus-correct-substring ,el ,cut))
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,el)
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`(let ((val (eval ,el)))
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(if (> (string-width val) ,cut)
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,(if (< cut-width 0)
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`(gnus-correct-substring val 0 (- (string-width val) ,cut))
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`(gnus-correct-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-pad-form (el pad-width)
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"Return a form that pads EL to PAD-WIDTH accounting for multi-column
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characters correctly. This is because `format' may pad to columns
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or to characters when given a pad value."
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(let ((pad (abs pad-width))
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(side (< 0 pad-width)))
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(if (symbolp el)
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`(let ((need (- ,pad (string-width ,el))))
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(if (> need 0)
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(concat ,(when side '(make-string need ?\ ))
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,el
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,(when (not side) '(make-string need ?\ )))
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,el))
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`(let* ((val (eval ,el))
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(need (- ,pad (string-width val))))
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(if (> need 0)
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(concat ,(when side '(make-string need ?\ ))
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val
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,(when (not side) '(make-string need ?\ )))
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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 the FORMAT string contains the specifiers %[ and %], the text between
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;; them will have the balloon-help text property.
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(let ((case-fold-search nil))
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(if (string-match
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"\\`\\(.*\\)%[0-9]?[{(«]\\(.*\\)%[0-9]?[»})]\\(.*\n?\\)\\'\\|%[-0-9]*=\\|%[-0-9]*\\*"
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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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(let ((cursor-spec nil))
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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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;; Convert all font specs into font spec lists.
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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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(= delim 171)) ; «
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(replace-match (concat "\"("
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(cond ((= delim ?\() "mouse")
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((= delim ?\{) "face")
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(t "balloon"))
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" " number " \"")
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t t)
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(replace-match "\")\""))))
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(goto-char (point-max))
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(insert "\")")
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;; Convert point position commands.
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(goto-char (point-min))
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(let ((case-fold-search nil))
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(while (re-search-forward "%\\([-0-9]+\\)?\\*" nil t)
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(replace-match "\"(point)\"" t t)
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(setq cursor-spec t)))
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;; Convert TAB commands.
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(goto-char (point-min))
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(while (re-search-forward "%\\([-0-9]+\\)=" nil t)
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(replace-match (format "\"(tab %s)\"" (match-string 1)) t t))
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;; Convert the buffer into the spec.
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(goto-char (point-min))
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(let ((form (read (current-buffer))))
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(if cursor-spec
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`(let (gnus-position)
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,@(gnus-complex-form-to-spec form spec-alist)
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(if gnus-position
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(put-text-property gnus-position (1+ gnus-position)
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'gnus-position t)))
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`(progn
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,@(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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(cond
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((stringp sform)
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(gnus-parse-simple-format sform spec-alist t))
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((eq (car sform) 'point)
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'(setq gnus-position (point)))
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((eq (car sform) 'tab)
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(gnus-spec-tab (cadr sform)))
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(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 extended-spec)
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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
|
|
pad-width nil
|
|
max-width nil
|
|
cut-width nil
|
|
ignore-value nil
|
|
tilde-form nil
|
|
extended-spec nil)
|
|
(setq spec-beg (1- (point)))
|
|
|
|
;; Parse this spec fully.
|
|
(while
|
|
(cond
|
|
((looking-at "\\([-.0-9]+\\)\\(,[-0-9]+\\)?")
|
|
(setq pad-width (string-to-number (match-string 1)))
|
|
(when (match-beginning 2)
|
|
(setq max-width (string-to-number (buffer-substring
|
|
(1+ (match-beginning 2))
|
|
(match-end 2)))))
|
|
(goto-char (match-end 0)))
|
|
((looking-at "~")
|
|
(forward-char 1)
|
|
(setq tilde (read (current-buffer))
|
|
type (car tilde)
|
|
value (cadr tilde))
|
|
(cond
|
|
((memq type '(pad pad-left))
|
|
(setq pad-width value))
|
|
((eq type 'pad-right)
|
|
(setq pad-width (- value)))
|
|
((memq type '(max-right max))
|
|
(setq max-width value))
|
|
((eq type 'max-left)
|
|
(setq max-width (- value)))
|
|
((memq type '(cut cut-left))
|
|
(setq cut-width value))
|
|
((eq type 'cut-right)
|
|
(setq cut-width (- value)))
|
|
((eq type 'ignore)
|
|
(setq ignore-value
|
|
(if (stringp value) value (format "%s" value))))
|
|
((eq type 'form)
|
|
(setq tilde-form value))
|
|
(t
|
|
(error "Unknown tilde type: %s" tilde)))
|
|
t)
|
|
(t
|
|
nil)))
|
|
(cond
|
|
;; User-defined spec -- find the spec name.
|
|
((eq (setq spec (char-after)) ?u)
|
|
(forward-char 1)
|
|
(when (and (eq (setq user-defined (char-after)) ?&)
|
|
(looking-at "&\\([^;]+\\);"))
|
|
(setq user-defined (match-string 1))
|
|
(goto-char (match-end 1))))
|
|
;; extended spec
|
|
((and (eq spec ?&) (looking-at "&\\([^;]+\\);"))
|
|
(setq extended-spec (intern (match-string 1)))
|
|
(goto-char (match-end 1))))
|
|
(forward-char 1)
|
|
(delete-region spec-beg (point))
|
|
|
|
;; Now we have all the relevant data on this spec, so
|
|
;; we start doing stuff.
|
|
(insert "%")
|
|
(if (eq spec ?%)
|
|
;; "%%" just results in a "%".
|
|
(insert "%")
|
|
(setq elem
|
|
(cond
|
|
;; Do tilde forms.
|
|
((eq spec ?@)
|
|
(list tilde-form ?s))
|
|
;; Treat user defined format specifiers specially.
|
|
(user-defined
|
|
(list
|
|
(list (intern (format
|
|
(if (stringp user-defined)
|
|
"gnus-user-format-function-%s"
|
|
"gnus-user-format-function-%c")
|
|
user-defined))
|
|
'gnus-tmp-header)
|
|
?s))
|
|
;; Find the specification from `spec-alist'.
|
|
((cdr (assq (or extended-spec spec) spec-alist)))
|
|
;; We used to use "%l" for displaying the grouplens score.
|
|
((eq spec ?l)
|
|
'("" ?s))
|
|
(t
|
|
'("*" ?s))))
|
|
(setq elem-type (cadr elem))
|
|
;; Insert the new format elements.
|
|
(when pad-width
|
|
(insert (number-to-string pad-width)))
|
|
;; Create the form to be evalled.
|
|
(if (or max-width cut-width ignore-value)
|
|
(progn
|
|
(insert ?s)
|
|
(let ((el (car elem)))
|
|
(cond ((= (cadr elem) ?c)
|
|
(setq el (list 'char-to-string el)))
|
|
((= (cadr elem) ?d)
|
|
(setq el (list 'int-to-string el))))
|
|
(when ignore-value
|
|
(setq el (gnus-tilde-ignore-form el ignore-value)))
|
|
(when cut-width
|
|
(setq el (gnus-tilde-cut-form el cut-width)))
|
|
(when max-width
|
|
(setq el (gnus-tilde-max-form el max-width)))
|
|
(when pad-width
|
|
(setq el (gnus-pad-form el pad-width)))
|
|
(push el flist)))
|
|
(insert elem-type)
|
|
(push (car elem) flist))))
|
|
(setq fstring (buffer-substring-no-properties (point-min) (point-max))))
|
|
|
|
;; Do some postprocessing to increase efficiency.
|
|
(setq
|
|
result
|
|
(cond
|
|
;; Emptiness.
|
|
((string= fstring "")
|
|
nil)
|
|
;; Not a format string.
|
|
((not (string-search "%" fstring))
|
|
(list fstring))
|
|
;; A format string with just a single string spec.
|
|
((string= fstring "%s")
|
|
(list (car flist)))
|
|
;; A single character.
|
|
((string= fstring "%c")
|
|
(list (car flist)))
|
|
;; A single number.
|
|
((string= fstring "%d")
|
|
(setq dontinsert t)
|
|
(if insert
|
|
`(insert (int-to-string ,(car flist)))
|
|
(list `(int-to-string ,(car flist)))))
|
|
;; Just lots of chars and strings.
|
|
((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
|
|
(add-text-properties (point) (progn (eval form t) (point)) props)
|
|
(eval form t))))
|
|
|
|
(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)))
|
|
|
|
|
|
(defun gnus-summary-line-format-spec ()
|
|
(insert gnus-tmp-unread gnus-tmp-replied
|
|
gnus-tmp-score-char gnus-tmp-indentation)
|
|
(put-text-property
|
|
(point)
|
|
(progn
|
|
(insert
|
|
gnus-tmp-opening-bracket
|
|
(format "%4d: %-20s"
|
|
gnus-tmp-lines
|
|
(if (> (length gnus-tmp-name) 20)
|
|
(truncate-string-to-width gnus-tmp-name 20)
|
|
gnus-tmp-name))
|
|
gnus-tmp-closing-bracket)
|
|
(point))
|
|
'mouse-face gnus-mouse-face)
|
|
(insert " " gnus-tmp-subject-or-nil "\n"))
|
|
|
|
(provide 'gnus-spec)
|
|
|
|
;; Local Variables:
|
|
;; coding: utf-8
|
|
;; End:
|
|
|
|
;;; gnus-spec.el ends here
|