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