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50ef36f521
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621 lines
19 KiB
EmacsLisp
621 lines
19 KiB
EmacsLisp
;;; nnheader.el --- header access macros for Gnus and its backends
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;; Copyright (C) 1987,88,89,90,93,94,95,96 Free Software Foundation, Inc.
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;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
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;; Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
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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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;; These macros may look very much like the ones in GNUS 4.1. They
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;; are, in a way, but you should note that the indices they use have
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;; been changed from the internal GNUS format to the NOV format. The
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;; makes it possible to read headers from XOVER much faster.
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;;
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;; The format of a header is now:
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;; [number subject from date id references chars lines xref]
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;;
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;; (That last entry is defined as "misc" in the NOV format, but Gnus
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;; uses it for xrefs.)
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;;; Code:
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(require 'mail-utils)
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(eval-when-compile (require 'cl))
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(defvar nnheader-max-head-length 4096
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"*Max length of the head of articles.")
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(defvar nnheader-file-name-translation-alist nil
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"*Alist that says how to translate characters in file names.
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For instance, if \":\" is illegal as a file character in file names
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on your system, you could say something like:
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\(setq nnheader-file-name-translation-alist '((?: . ?_)))")
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;;; Header access macros.
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(defmacro mail-header-number (header)
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"Return article number in HEADER."
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`(aref ,header 0))
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(defmacro mail-header-set-number (header number)
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"Set article number of HEADER to NUMBER."
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`(aset ,header 0 ,number))
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(defmacro mail-header-subject (header)
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"Return subject string in HEADER."
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`(aref ,header 1))
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(defmacro mail-header-set-subject (header subject)
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"Set article subject of HEADER to SUBJECT."
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`(aset ,header 1 ,subject))
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(defmacro mail-header-from (header)
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"Return author string in HEADER."
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`(aref ,header 2))
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(defmacro mail-header-set-from (header from)
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"Set article author of HEADER to FROM."
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`(aset ,header 2 ,from))
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(defmacro mail-header-date (header)
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"Return date in HEADER."
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`(aref ,header 3))
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(defmacro mail-header-set-date (header date)
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"Set article date of HEADER to DATE."
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`(aset ,header 3 ,date))
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(defalias 'mail-header-message-id 'mail-header-id)
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(defmacro mail-header-id (header)
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"Return Id in HEADER."
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`(aref ,header 4))
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(defalias 'mail-header-set-message-id 'mail-header-set-id)
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(defmacro mail-header-set-id (header id)
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"Set article Id of HEADER to ID."
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`(aset ,header 4 ,id))
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(defmacro mail-header-references (header)
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"Return references in HEADER."
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`(aref ,header 5))
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(defmacro mail-header-set-references (header ref)
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"Set article references of HEADER to REF."
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`(aset ,header 5 ,ref))
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(defmacro mail-header-chars (header)
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"Return number of chars of article in HEADER."
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`(aref ,header 6))
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(defmacro mail-header-set-chars (header chars)
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"Set number of chars in article of HEADER to CHARS."
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`(aset ,header 6 ,chars))
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(defmacro mail-header-lines (header)
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"Return lines in HEADER."
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`(aref ,header 7))
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(defmacro mail-header-set-lines (header lines)
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"Set article lines of HEADER to LINES."
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`(aset ,header 7 ,lines))
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(defmacro mail-header-xref (header)
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"Return xref string in HEADER."
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`(aref ,header 8))
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(defmacro mail-header-set-xref (header xref)
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"Set article xref of HEADER to xref."
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`(aset ,header 8 ,xref))
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(defun make-mail-header (&optional init)
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"Create a new mail header structure initialized with INIT."
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(make-vector 9 init))
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;; Parsing headers and NOV lines.
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(defsubst nnheader-header-value ()
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(buffer-substring (match-end 0) (gnus-point-at-eol)))
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(defvar nnheader-newsgroup-none-id 1)
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(defun nnheader-parse-head (&optional naked)
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(let ((case-fold-search t)
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(cur (current-buffer))
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(buffer-read-only nil)
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end ref in-reply-to lines p)
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(goto-char (point-min))
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(when naked
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(insert "\n"))
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;; Search to the beginning of the next header. Error messages
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;; do not begin with 2 or 3.
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(prog1
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(when (or naked (re-search-forward "^[23][0-9]+ " nil t))
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;; This implementation of this function, with nine
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;; search-forwards instead of the one re-search-forward and
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;; a case (which basically was the old function) is actually
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;; about twice as fast, even though it looks messier. You
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;; can't have everything, I guess. Speed and elegance
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;; doesn't always go hand in hand.
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(vector
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;; Number.
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(if naked
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(progn
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(setq p (point-min))
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0)
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(prog1
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(read cur)
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(end-of-line)
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(setq p (point))
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(narrow-to-region (point)
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(or (and (search-forward "\n.\n" nil t)
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(- (point) 2))
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(point)))))
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;; Subject.
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(progn
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(goto-char p)
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(if (search-forward "\nsubject: " nil t)
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(nnheader-header-value) "(none)"))
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;; From.
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(progn
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(goto-char p)
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(if (search-forward "\nfrom: " nil t)
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(nnheader-header-value) "(nobody)"))
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;; Date.
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(progn
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(goto-char p)
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(if (search-forward "\ndate: " nil t)
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(nnheader-header-value) ""))
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;; Message-ID.
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(progn
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(goto-char p)
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(if (search-forward "\nmessage-id: " nil t)
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(nnheader-header-value)
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;; If there was no message-id, we just fake one to make
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;; subsequent routines simpler.
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(concat "none+"
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(int-to-string
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(incf nnheader-newsgroup-none-id)))))
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;; References.
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(progn
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(goto-char p)
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(if (search-forward "\nreferences: " nil t)
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(nnheader-header-value)
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;; Get the references from the in-reply-to header if there
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;; were no references and the in-reply-to header looks
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;; promising.
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(if (and (search-forward "\nin-reply-to: " nil t)
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(setq in-reply-to (nnheader-header-value))
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(string-match "<[^>]+>" in-reply-to))
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(substring in-reply-to (match-beginning 0)
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(match-end 0))
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"")))
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;; Chars.
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0
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;; Lines.
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(progn
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(goto-char p)
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(if (search-forward "\nlines: " nil t)
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(if (numberp (setq lines (read cur)))
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lines 0)
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0))
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;; Xref.
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(progn
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(goto-char p)
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(and (search-forward "\nxref: " nil t)
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(nnheader-header-value)))))
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(when naked
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(goto-char (point-min))
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(delete-char 1)))))
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(defun nnheader-insert-nov (header)
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(princ (mail-header-number header) (current-buffer))
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(insert
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"\t"
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(or (mail-header-subject header) "(none)") "\t"
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(or (mail-header-from header) "(nobody)") "\t"
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(or (mail-header-date header) "") "\t"
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(or (mail-header-id header)
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(nnmail-message-id)) "\t"
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(or (mail-header-references header) "") "\t")
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(princ (or (mail-header-chars header) 0) (current-buffer))
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(insert "\t")
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(princ (or (mail-header-lines header) 0) (current-buffer))
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(insert "\t")
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(when (mail-header-xref header)
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(insert "Xref: " (mail-header-xref header) "\t"))
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(insert "\n"))
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(defun nnheader-insert-article-line (article)
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(goto-char (point-min))
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(insert "220 ")
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(princ article (current-buffer))
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(insert " Article retrieved.\n")
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(search-forward "\n\n" nil 'move)
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(delete-region (point) (point-max))
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(forward-char -1)
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(insert "."))
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;; Various cruft the backends and Gnus need to communicate.
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(defvar nntp-server-buffer nil)
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(defvar gnus-verbose-backends 7
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"*A number that says how talkative the Gnus backends should be.")
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(defvar gnus-nov-is-evil nil
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"If non-nil, Gnus backends will never output headers in the NOV format.")
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(defvar news-reply-yank-from nil)
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(defvar news-reply-yank-message-id nil)
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(defvar nnheader-callback-function nil)
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(defun nnheader-init-server-buffer ()
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"Initialize the Gnus-backend communication buffer."
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(save-excursion
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(setq nntp-server-buffer (get-buffer-create " *nntpd*"))
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(set-buffer nntp-server-buffer)
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(buffer-disable-undo (current-buffer))
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(erase-buffer)
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(kill-all-local-variables)
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(setq case-fold-search t) ;Should ignore case.
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t))
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;;; Various functions the backends use.
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(defun nnheader-file-error (file)
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"Return a string that says what is wrong with FILE."
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(format
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(cond
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((not (file-exists-p file))
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"%s does not exist")
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((file-directory-p file)
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"%s is a directory")
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((not (file-readable-p file))
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"%s is not readable"))
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file))
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(defun nnheader-insert-head (file)
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"Insert the head of the article."
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(when (file-exists-p file)
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(if (eq nnheader-max-head-length t)
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;; Just read the entire file.
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(nnheader-insert-file-contents-literally file)
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;; Read 1K blocks until we find a separator.
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(let ((beg 0)
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format-alist
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(chop 1024))
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(while (and (not (zerop (nth 1 (insert-file-contents
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file nil beg (incf beg chop)))))
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(prog1 (not (search-forward "\n\n" nil t))
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(goto-char (point-max)))
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(or (null nnheader-max-head-length)
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(< beg nnheader-max-head-length))))))
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t))
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(defun nnheader-article-p ()
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"Say whether the current buffer looks like an article."
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(goto-char (point-min))
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(if (not (search-forward "\n\n" nil t))
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nil
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(narrow-to-region (point-min) (1- (point)))
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(goto-char (point-min))
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(while (looking-at "[A-Z][^ \t]+:.*\n\\([ \t].*\n\\)*\\|From .*\n")
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(goto-char (match-end 0)))
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(prog1
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(eobp)
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(widen))))
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(defun nnheader-insert-references (references message-id)
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"Insert a References header based on REFERENCES and MESSAGE-ID."
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(if (and (not references) (not message-id))
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() ; This is illegal, but not all articles have Message-IDs.
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(mail-position-on-field "References")
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(let ((begin (save-excursion (beginning-of-line) (point)))
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(fill-column 78)
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(fill-prefix "\t"))
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(if references (insert references))
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(if (and references message-id) (insert " "))
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(if message-id (insert message-id))
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;; Fold long References lines to conform to RFC1036 (sort of).
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;; The region must end with a newline to fill the region
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;; without inserting extra newline.
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(fill-region-as-paragraph begin (1+ (point))))))
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(defun nnheader-replace-header (header new-value)
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"Remove HEADER and insert the NEW-VALUE."
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(save-excursion
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(save-restriction
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(nnheader-narrow-to-headers)
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(prog1
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(message-remove-header header)
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(goto-char (point-max))
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(insert header ": " new-value "\n")))))
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(defun nnheader-narrow-to-headers ()
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"Narrow to the head of an article."
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(widen)
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(narrow-to-region
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(goto-char (point-min))
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(if (search-forward "\n\n" nil t)
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(1- (point))
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(point-max)))
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(goto-char (point-min)))
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(defun nnheader-set-temp-buffer (name)
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"Set-buffer to an empty (possibly new) buffer called NAME with undo disabled."
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(set-buffer (get-buffer-create name))
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(buffer-disable-undo (current-buffer))
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(erase-buffer)
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(current-buffer))
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(defmacro nnheader-temp-write (file &rest forms)
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"Create a new buffer, evaluate FORM there, and write the buffer to FILE."
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`(save-excursion
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(let ((nnheader-temp-file ,file)
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(nnheader-temp-cur-buffer
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(nnheader-set-temp-buffer
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(generate-new-buffer-name " *nnheader temp*"))))
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(when (and nnheader-temp-file
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(not (file-directory-p (file-name-directory
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nnheader-temp-file))))
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(make-directory (file-name-directory nnheader-temp-file) t))
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(unwind-protect
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(prog1
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(progn
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,@forms)
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(when nnheader-temp-file
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(set-buffer nnheader-temp-cur-buffer)
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(write-region (point-min) (point-max)
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nnheader-temp-file nil 'nomesg)))
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(when (buffer-name nnheader-temp-cur-buffer)
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(kill-buffer nnheader-temp-cur-buffer))))))
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(put 'nnheader-temp-write 'lisp-indent-function 1)
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(put 'nnheader-temp-write 'lisp-indent-hook 1)
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(put 'nnheader-temp-write 'edebug-form-spec '(form body))
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(defvar jka-compr-compression-info-list)
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(defvar nnheader-numerical-files
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(if (boundp 'jka-compr-compression-info-list)
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(concat "\\([0-9]+\\)\\("
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(mapconcat (lambda (i) (aref i 0))
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jka-compr-compression-info-list "\\|")
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"\\)?")
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"[0-9]+$")
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"Regexp that match numerical files.")
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(defvar nnheader-numerical-short-files (concat "^" nnheader-numerical-files)
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"Regexp that matches numerical file names.")
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(defvar nnheader-numerical-full-files (concat "/" nnheader-numerical-files)
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"Regexp that matches numerical full file paths.")
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(defsubst nnheader-file-to-number (file)
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"Take a file name and return the article number."
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(if (not (boundp 'jka-compr-compression-info-list))
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(string-to-int file)
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(string-match nnheader-numerical-short-files file)
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(string-to-int (match-string 0 file))))
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(defun nnheader-directory-files-safe (&rest args)
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;; It has been reported numerous times that `directory-files'
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;; fails with an alarming frequency on NFS mounted file systems.
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;; This function executes that function twice and returns
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;; the longest result.
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(let ((first (apply 'directory-files args))
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(second (apply 'directory-files args)))
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(if (> (length first) (length second))
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first
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second)))
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(defun nnheader-directory-articles (dir)
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"Return a list of all article files in a directory."
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(mapcar 'nnheader-file-to-number
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(nnheader-directory-files-safe
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dir nil nnheader-numerical-short-files t)))
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(defun nnheader-article-to-file-alist (dir)
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"Return an alist of article/file pairs in DIR."
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(mapcar (lambda (file) (cons (nnheader-file-to-number file) file))
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(nnheader-directory-files-safe
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dir nil nnheader-numerical-short-files t)))
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(defun nnheader-fold-continuation-lines ()
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"Fold continuation lines in the current buffer."
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(goto-char (point-min))
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(while (re-search-forward "\\(\r?\n[ \t]+\\)+" nil t)
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(replace-match " " t t)))
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(defun nnheader-translate-file-chars (file)
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(if (null nnheader-file-name-translation-alist)
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;; No translation is necessary.
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file
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;; We translate -- but only the file name. We leave the directory
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;; alone.
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(let* ((i 0)
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trans leaf path len)
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(if (string-match "/[^/]+\\'" file)
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;; This is needed on NT's and stuff.
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(setq leaf (substring file (1+ (match-beginning 0)))
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path (substring file 0 (1+ (match-beginning 0))))
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;; Fall back on this.
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(setq leaf (file-name-nondirectory file)
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path (file-name-directory file)))
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(setq len (length leaf))
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(while (< i len)
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(when (setq trans (cdr (assq (aref leaf i)
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nnheader-file-name-translation-alist)))
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(aset leaf i trans))
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(incf i))
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(concat path leaf))))
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(defun nnheader-report (backend &rest args)
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"Report an error from the BACKEND.
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The first string in ARGS can be a format string."
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(set (intern (format "%s-status-string" backend))
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(if (< (length args) 2)
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(car args)
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(apply 'format args)))
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nil)
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(defun nnheader-get-report (backend)
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(message "%s" (symbol-value (intern (format "%s-status-string" backend)))))
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(defun nnheader-insert (format &rest args)
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|
"Clear the communicaton buffer and insert FORMAT and ARGS into the buffer.
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|
If FORMAT isn't a format string, it and all ARGS will be inserted
|
|
without formatting."
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(save-excursion
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(set-buffer nntp-server-buffer)
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|
(erase-buffer)
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(if (string-match "%" format)
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(insert (apply 'format format args))
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(apply 'insert format args))
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t))
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|
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(defun nnheader-mail-file-mbox-p (file)
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"Say whether FILE looks like an Unix mbox file."
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|
(when (and (file-exists-p file)
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(file-readable-p file)
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|
(file-regular-p file))
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|
(save-excursion
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|
(nnheader-set-temp-buffer " *mail-file-mbox-p*")
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|
(nnheader-insert-file-contents-literally file)
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|
(goto-char (point-min))
|
|
(prog1
|
|
(looking-at message-unix-mail-delimiter)
|
|
(kill-buffer (current-buffer))))))
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|
|
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(defun nnheader-replace-chars-in-string (string from to)
|
|
"Replace characters in STRING from FROM to TO."
|
|
(let ((string (substring string 0)) ;Copy string.
|
|
(len (length string))
|
|
(idx 0))
|
|
;; Replace all occurrences of FROM with TO.
|
|
(while (< idx len)
|
|
(if (= (aref string idx) from)
|
|
(aset string idx to))
|
|
(setq idx (1+ idx)))
|
|
string))
|
|
|
|
(defun nnheader-file-to-group (file &optional top)
|
|
"Return a group name based on FILE and TOP."
|
|
(nnheader-replace-chars-in-string
|
|
(if (not top)
|
|
file
|
|
(condition-case ()
|
|
(substring (expand-file-name file)
|
|
(length
|
|
(expand-file-name
|
|
(file-name-as-directory top))))
|
|
(error "")))
|
|
?/ ?.))
|
|
|
|
(defun nnheader-message (level &rest args)
|
|
"Message if the Gnus backends are talkative."
|
|
(if (or (not (numberp gnus-verbose-backends))
|
|
(<= level gnus-verbose-backends))
|
|
(apply 'message args)
|
|
(apply 'format args)))
|
|
|
|
(defun nnheader-be-verbose (level)
|
|
"Return whether the backends should be verbose on LEVEL."
|
|
(or (not (numberp gnus-verbose-backends))
|
|
(<= level gnus-verbose-backends)))
|
|
|
|
(defun nnheader-group-pathname (group dir &optional file)
|
|
"Make pathname for GROUP."
|
|
(concat
|
|
(let ((dir (file-name-as-directory (expand-file-name dir))))
|
|
;; If this directory exists, we use it directly.
|
|
(if (file-directory-p (concat dir group))
|
|
(concat dir group "/")
|
|
;; If not, we translate dots into slashes.
|
|
(concat dir (nnheader-replace-chars-in-string group ?. ?/) "/")))
|
|
(cond ((null file) "")
|
|
((numberp file) (int-to-string file))
|
|
(t file))))
|
|
|
|
(defun nnheader-functionp (form)
|
|
"Return non-nil if FORM is funcallable."
|
|
(or (and (symbolp form) (fboundp form))
|
|
(and (listp form) (eq (car form) 'lambda))))
|
|
|
|
(defun nnheader-concat (dir file)
|
|
"Concat DIR as directory to FILE."
|
|
(concat (file-name-as-directory dir) file))
|
|
|
|
(defun nnheader-ms-strip-cr ()
|
|
"Strip ^M from the end of all lines."
|
|
(save-excursion
|
|
(goto-char (point-min))
|
|
(while (re-search-forward "\r$" nil t)
|
|
(delete-backward-char 1))))
|
|
|
|
(defun nnheader-file-size (file)
|
|
"Return the file size of FILE or 0."
|
|
(or (nth 7 (file-attributes file)) 0))
|
|
|
|
(defun nnheader-find-etc-directory (package)
|
|
"Go through the path and find the \".../etc/PACKAGE\" directory."
|
|
(let ((path load-path)
|
|
dir result)
|
|
;; We try to find the dir by looking at the load path,
|
|
;; stripping away the last component and adding "etc/".
|
|
(while path
|
|
(if (and (car path)
|
|
(file-exists-p
|
|
(setq dir (concat
|
|
(file-name-directory
|
|
(directory-file-name (car path)))
|
|
"etc/" package "/")))
|
|
(file-directory-p dir))
|
|
(setq result dir
|
|
path nil)
|
|
(setq path (cdr path))))
|
|
result))
|
|
|
|
(defvar ange-ftp-path-format)
|
|
(defvar efs-path-regexp)
|
|
(defun nnheader-re-read-dir (path)
|
|
"Re-read directory PATH if PATH is on a remote system."
|
|
(if (boundp 'ange-ftp-path-format)
|
|
(when (string-match (car ange-ftp-path-format) path)
|
|
(ange-ftp-re-read-dir path))
|
|
(if (boundp 'efs-path-regexp)
|
|
(when (string-match efs-path-regexp path)
|
|
(efs-re-read-dir path)))))
|
|
|
|
(fset 'nnheader-run-at-time 'run-at-time)
|
|
(fset 'nnheader-cancel-timer 'cancel-timer)
|
|
(fset 'nnheader-find-file-noselect 'find-file-noselect)
|
|
(fset 'nnheader-insert-file-contents-literally
|
|
'insert-file-contents-literally)
|
|
|
|
(when (string-match "XEmacs\\|Lucid" emacs-version)
|
|
(require 'nnheaderxm))
|
|
|
|
(run-hooks 'nnheader-load-hook)
|
|
|
|
(provide 'nnheader)
|
|
|
|
;;; nnheader.el ends here
|