(scheme-mode-variables): Use setq to assign buffer-local value

[bpt/emacs.git] / man / newsticker.texi

\input texinfo   @c -*-texinfo-*-
@comment $Id: newsticker.texi,v 1.3 2005/09/15 12:32:15 rms Exp $
@comment %**start of header
@setfilename ../info/newsticker
@set VERSION 1.8
@set UPDATED ``$Id: newsticker.texi,v 1.3 2005/09/15 12:32:15 rms Exp $''
@settitle Newsticker @value{VERSION}
@syncodeindex vr cp
@syncodeindex fn cp
@syncodeindex pg cp
@comment %**end of header

@copying
This manual is for Newsticker (version @value{VERSION}, @value{UPDATED}).

@noindent
Copyright @copyright{} 2004, 2005  Free Software Foundation, Inc.

@quotation
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no
Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.  A
copy of the license is included in the section entitled ``GNU Free
Documentation License''.
@end quotation
@end copying

@dircategory Emacs
@direntry
* Newsticker: (newsticker). A Newsticker for Emacs.
@end direntry

@titlepage
@title Newsticker -- a Newsticker for Emacs
@subtitle for version @value{VERSION}, @value{UPDATED}
@author Ulf Jasper
@author @email{ulf.jasper@@web.de}
@author @uref{http://de.geocities.com/ulf_jasper}
@page
@vskip 0pt plus 1filll
@insertcopying
@end titlepage

@contents

@ifnottex
@node Top
@top Newsticker

@insertcopying
@end ifnottex

@menu
* Overview::
* Requirements::
* Installation::
* Usage::
* Configuration::
* Remarks::
* GNU Free Documentation License::
* Index::
@end menu

@node Overview
@chapter Overview

Newsticker provides a newsticker for Emacs. A newsticker is a thing
that asynchronously retrieves headlines from a list of news sites,
prepares these headlines for reading, and allows for loading the
corresponding articles in a web browser.

Headlines consist of a title and (possibly) a small description. They
are contained in RSS (RDF Site Summary) files.  Newsticker should work
with all RSS files that follow the @uref{http://purl.org/rss/1.0/spec,
RDF Rich Site Summary 1.0} specification. It should also work with
version 2.0 as well as other/older/alternative rss formats (like
0.9<something> or such). In other words: Newsticker is a ``RSS
reader'' or ``RSS aggregator''.

Newsticker provides several commands for reading headlines, navigating
through them, marking them as read/unread, hiding old headlines etc.
Headlines can be displayed as plain text or as rendered HTML.

Headlines can be displayed in the echo area, either scrolling like
messages in a stock-quote ticker, or just changing.

Newsticker allows for automatic processing of headlines by providing
hooks and (sample) functions for automatically downloading images and
enclosed files (as delivered by podcasts, e.g.).

@ifhtml
Here are screen shots of the @uref{newsticker-1.7.png, version 1.7
(current version)} and some older screen shots:
@uref{newsticker-1.6.png, version 1.6},
@uref{newsticker-1.5.png, version 1.5}, 
@uref{newsticker-1.4.png, version 1.4}
@uref{newsticker-1.3.png, version 1.3}, 
@uref{newsticker-1.0.png, version 1.0}.
@end ifhtml

@node Requirements
@chapter Requirements

Newsticker can be used with
@uref{http://www.gnu.org/software/emacs/emacs.html, GNU Emacs} version
21.1 or later as well as @uref{http://www.xemacs.org, XEmacs}.  It
requires an XML-parser (@file{xml.el}) which is part of GNU Emacs.  If
you are using XEmacs you want to get the @file{net-utils} package
which contains @file{xml.el} for XEmacs.

Newsticker requires a program which can retrieve files via http and
prints them to stdout.  By default Newsticker will use
@uref{http://www.gnu.org/software/wget/wget.html, wget} for this task.


@node Installation
@chapter Installation

Place Newsticker in a directory where Emacs can find it. Add the
following line to your Emacs startup file (@file{~/.emacs}).

@example
(add-to-list 'load-path "/path/to/newsticker/")
(autoload 'newsticker-start "newsticker" "Emacs Newsticker" t)
(autoload 'newsticker-show-news "newsticker" "Emacs Newsticker" t)
@end example

Newsticker-mode supports imenu. This allows for navigating with the
help of a menu. In order to use this feature you should also add the
following.

@example
(add-hook 'newsticker-mode-hook 'imenu-add-menubar-index)
@end example

That's it.

@node Usage
@chapter Usage

@findex newsticker-show-news
The command @command{newsticker-show-news} will display all available
headlines in a special buffer, called @samp{*newsticker*}.  It will
also start the asynchronous download of headlines.  The modeline in
the @samp{*newsticker*} buffer informs whenever new headlines have
arrived.  Clicking mouse-button 2 or pressing RET in this buffer on a
headline will call @command{browse-url} to load the corresponding news
story in your favourite web browser.

@findex newsticker-start-ticker
@findex newsticker-stop-ticker
The scrolling, or flashing of headlines in the echo area, can be
started with the command @command{newsticker-start-ticker}. It can be
stopped with @command{newsticker-stop-ticker}.

@findex newsticker-start
@findex newsticker-stop
If you just want to start the periodic download of headlines use the
command @command{newsticker-start}. Calling @command{newsticker-stop}
will stop the periodic download, but will call
@command{newsticker-stop-ticker} as well.

@node Configuration
@chapter Configuration

All Newsticker options are customizable, i.e. they can be changed with
Emacs customization methods: Call the command
@command{customize-group} and enter @samp{newsticker} for the customization
group.

All Newsticker options have reasonable default values, so that in most
cases it is not necessary to customize settings before starting Newsticker
for the first time.

Newsticker options are organized in the following groups.

@itemize

@item
@command{newsticker-feed} contains options that define which news
feeds are retrieved and how this is done.  

@itemize
@item
@vindex newsticker-url-list
@command{newsticker-url-list} defines the list of headlines which are
retrieved.
@item
@vindex newsticker-retrieval-interval
@command{newsticker-retrieval-interval} defines how often headlines
are retrieved.
@end itemize

@item
@command{newsticker-headline-processing} contains options that define
how the retrieved headlines are processed.

@itemize
@item
@vindex newsticker-keep-obsolete-items
@command{newsticker-keep-obsolete-items} decides whether unread
headlines that have been removed from the feed are kept in the
Newsticker cache.
@end itemize

@item
@command{newsticker-layout} contains options that define how the
buffer for reading RSS headlines is formatted.

@itemize
@item
@vindex newsticker-heading-format
@command{newsticker-item-format} defines how the title of a headline
is formatted.
@end itemize

@item
@command{newsticker-ticker} contains options that define how headlines
are shown in the echo area.

@itemize
@item
@vindex newsticker-display-interval
@vindex newsticker-scroll-smoothly
@command{newsticker-display-interval} and
@command{newsticker-scroll-smoothly} define how headlines are shown in
the echo area.
@end itemize

@item
@command{newsticker-hooks} contains options for hooking other Emacs
commands to newsticker functions. 
@itemize
@item
@vindex newsticker-new-item-functions
@command{newsticker-new-item-functions} allows for automatic
processing of headlines. See `newsticker-download-images', and
`newsticker-download-enclosures' for sample functions.
@end itemize

@item
@command{newsticker-miscellaneous} contains other Newsticker options.

@end itemize

Please have a look at the customization buffers for the complete list
of options.

@node Remarks
@chapter Remarks

This newsticker is designed do its job silently in the background
without disturbing you.  However, it is probably impossible to prevent
such a tool from slightly attenuating your Editor's responsiveness
every once in a while.

Byte-compiling newsticker.el is recommended.


@node GNU Free Documentation License
@chapter GNU Free Documentation License

@verbatim

                    GNU Free Documentation License
                    ==============================

                      Version 1.2, November 2002
     Copyright (C) 2000,2001,2002 Free Software Foundation, Inc.
     59 Temple Place, Suite 330, Boston, MA  02111-1307, USA
     
     Everyone is permitted to copy and distribute verbatim copies
     of this license document, but changing it is not allowed.

  0. PREAMBLE

     The purpose of this License is to make a manual, textbook, or other
     functional and useful document "free" in the sense of freedom: to
     assure everyone the effective freedom to copy and redistribute it,
     with or without modifying it, either commercially or
     noncommercially.  Secondarily, this License preserves for the
     author and publisher a way to get credit for their work, while not
     being considered responsible for modifications made by others.

     This License is a kind of "copyleft", which means that derivative
     works of the document must themselves be free in the same sense.
     It complements the GNU General Public License, which is a copyleft
     license designed for free software.

     We have designed this License in order to use it for manuals for
     free software, because free software needs free documentation: a
     free program should come with manuals providing the same freedoms
     that the software does.  But this License is not limited to
     software manuals; it can be used for any textual work, regardless
     of subject matter or whether it is published as a printed book.
     We recommend this License principally for works whose purpose is
     instruction or reference.

  1. APPLICABILITY AND DEFINITIONS

     This License applies to any manual or other work, in any medium,
     that contains a notice placed by the copyright holder saying it
     can be distributed under the terms of this License.  Such a notice
     grants a world-wide, royalty-free license, unlimited in duration,
     to use that work under the conditions stated herein.  The
     "Document", below, refers to any such manual or work.  Any member
     of the public is a licensee, and is addressed as "you".  You
     accept the license if you copy, modify or distribute the work in a
     way requiring permission under copyright law.

     A "Modified Version" of the Document means any work containing the
     Document or a portion of it, either copied verbatim, or with
     modifications and/or translated into another language.

     A "Secondary Section" is a named appendix or a front-matter section
     of the Document that deals exclusively with the relationship of the
     publishers or authors of the Document to the Document's overall
     subject (or to related matters) and contains nothing that could
     fall directly within that overall subject.  (Thus, if the Document
     is in part a textbook of mathematics, a Secondary Section may not
     explain any mathematics.)  The relationship could be a matter of
     historical connection with the subject or with related matters, or
     of legal, commercial, philosophical, ethical or political position
     regarding them.

     The "Invariant Sections" are certain Secondary Sections whose
     titles are designated, as being those of Invariant Sections, in
     the notice that says that the Document is released under this
     License.  If a section does not fit the above definition of
     Secondary then it is not allowed to be designated as Invariant.
     The Document may contain zero Invariant Sections.  If the Document
     does not identify any Invariant Sections then there are none.

     The "Cover Texts" are certain short passages of text that are
     listed, as Front-Cover Texts or Back-Cover Texts, in the notice
     that says that the Document is released under this License.  A
     Front-Cover Text may be at most 5 words, and a Back-Cover Text may
     be at most 25 words.

     A "Transparent" copy of the Document means a machine-readable copy,
     represented in a format whose specification is available to the
     general public, that is suitable for revising the document
     straightforwardly with generic text editors or (for images
     composed of pixels) generic paint programs or (for drawings) some
     widely available drawing editor, and that is suitable for input to
     text formatters or for automatic translation to a variety of
     formats suitable for input to text formatters.  A copy made in an
     otherwise Transparent file format whose markup, or absence of
     markup, has been arranged to thwart or discourage subsequent
     modification by readers is not Transparent.  An image format is
     not Transparent if used for any substantial amount of text.  A
     copy that is not "Transparent" is called "Opaque".

     Examples of suitable formats for Transparent copies include plain
     ASCII without markup, Texinfo input format, LaTeX input format,
     SGML or XML using a publicly available DTD, and
     standard-conforming simple HTML, PostScript or PDF designed for
     human modification.  Examples of transparent image formats include
     PNG, XCF and JPG.  Opaque formats include proprietary formats that
     can be read and edited only by proprietary word processors, SGML or
     XML for which the DTD and/or processing tools are not generally
     available, and the machine-generated HTML, PostScript or PDF
     produced by some word processors for output purposes only.

     The "Title Page" means, for a printed book, the title page itself,
     plus such following pages as are needed to hold, legibly, the
     material this License requires to appear in the title page.  For
     works in formats which do not have any title page as such, "Title
     Page" means the text near the most prominent appearance of the
     work's title, preceding the beginning of the body of the text.

     A section "Entitled XYZ" means a named subunit of the Document
     whose title either is precisely XYZ or contains XYZ in parentheses
     following text that translates XYZ in another language.  (Here XYZ
     stands for a specific section name mentioned below, such as
     "Acknowledgements", "Dedications", "Endorsements", or "History".)
     To "Preserve the Title" of such a section when you modify the
     Document means that it remains a section "Entitled XYZ" according
     to this definition.

     The Document may include Warranty Disclaimers next to the notice
     which states that this License applies to the Document.  These
     Warranty Disclaimers are considered to be included by reference in
     this License, but only as regards disclaiming warranties: any other
     implication that these Warranty Disclaimers may have is void and
     has no effect on the meaning of this License.

  2. VERBATIM COPYING

     You may copy and distribute the Document in any medium, either
     commercially or noncommercially, provided that this License, the
     copyright notices, and the license notice saying this License
     applies to the Document are reproduced in all copies, and that you
     add no other conditions whatsoever to those of this License.  You
     may not use technical measures to obstruct or control the reading
     or further copying of the copies you make or distribute.  However,
     you may accept compensation in exchange for copies.  If you
     distribute a large enough number of copies you must also follow
     the conditions in section 3.

     You may also lend copies, under the same conditions stated above,
     and you may publicly display copies.

  3. COPYING IN QUANTITY

     If you publish printed copies (or copies in media that commonly
     have printed covers) of the Document, numbering more than 100, and
     the Document's license notice requires Cover Texts, you must
     enclose the copies in covers that carry, clearly and legibly, all
     these Cover Texts: Front-Cover Texts on the front cover, and
     Back-Cover Texts on the back cover.  Both covers must also clearly
     and legibly identify you as the publisher of these copies.  The
     front cover must present the full title with all words of the
     title equally prominent and visible.  You may add other material
     on the covers in addition.  Copying with changes limited to the
     covers, as long as they preserve the title of the Document and
     satisfy these conditions, can be treated as verbatim copying in
     other respects.

     If the required texts for either cover are too voluminous to fit
     legibly, you should put the first ones listed (as many as fit
     reasonably) on the actual cover, and continue the rest onto
     adjacent pages.

     If you publish or distribute Opaque copies of the Document
     numbering more than 100, you must either include a
     machine-readable Transparent copy along with each Opaque copy, or
     state in or with each Opaque copy a computer-network location from
     which the general network-using public has access to download
     using public-standard network protocols a complete Transparent
     copy of the Document, free of added material.  If you use the
     latter option, you must take reasonably prudent steps, when you
     begin distribution of Opaque copies in quantity, to ensure that
     this Transparent copy will remain thus accessible at the stated
     location until at least one year after the last time you
     distribute an Opaque copy (directly or through your agents or
     retailers) of that edition to the public.

     It is requested, but not required, that you contact the authors of
     the Document well before redistributing any large number of
     copies, to give them a chance to provide you with an updated
     version of the Document.

  4. MODIFICATIONS

     You may copy and distribute a Modified Version of the Document
     under the conditions of sections 2 and 3 above, provided that you
     release the Modified Version under precisely this License, with
     the Modified Version filling the role of the Document, thus
     licensing distribution and modification of the Modified Version to
     whoever possesses a copy of it.  In addition, you must do these
     things in the Modified Version:

       A. Use in the Title Page (and on the covers, if any) a title
          distinct from that of the Document, and from those of
          previous versions (which should, if there were any, be listed
          in the History section of the Document).  You may use the
          same title as a previous version if the original publisher of
          that version gives permission.

       B. List on the Title Page, as authors, one or more persons or
          entities responsible for authorship of the modifications in
          the Modified Version, together with at least five of the
          principal authors of the Document (all of its principal
          authors, if it has fewer than five), unless they release you
          from this requirement.

       C. State on the Title page the name of the publisher of the
          Modified Version, as the publisher.

       D. Preserve all the copyright notices of the Document.

       E. Add an appropriate copyright notice for your modifications
          adjacent to the other copyright notices.

       F. Include, immediately after the copyright notices, a license
          notice giving the public permission to use the Modified
          Version under the terms of this License, in the form shown in
          the Addendum below.

       G. Preserve in that license notice the full lists of Invariant
          Sections and required Cover Texts given in the Document's
          license notice.

       H. Include an unaltered copy of this License.

       I. Preserve the section Entitled "History", Preserve its Title,
          and add to it an item stating at least the title, year, new
          authors, and publisher of the Modified Version as given on
          the Title Page.  If there is no section Entitled "History" in
          the Document, create one stating the title, year, authors,
          and publisher of the Document as given on its Title Page,
          then add an item describing the Modified Version as stated in
          the previous sentence.

       J. Preserve the network location, if any, given in the Document
          for public access to a Transparent copy of the Document, and
          likewise the network locations given in the Document for
          previous versions it was based on.  These may be placed in
          the "History" section.  You may omit a network location for a
          work that was published at least four years before the
          Document itself, or if the original publisher of the version
          it refers to gives permission.

       K. For any section Entitled "Acknowledgements" or "Dedications",
          Preserve the Title of the section, and preserve in the
          section all the substance and tone of each of the contributor
          acknowledgements and/or dedications given therein.

       L. Preserve all the Invariant Sections of the Document,
          unaltered in their text and in their titles.  Section numbers
          or the equivalent are not considered part of the section
          titles.

       M. Delete any section Entitled "Endorsements".  Such a section
          may not be included in the Modified Version.

       N. Do not retitle any existing section to be Entitled
          "Endorsements" or to conflict in title with any Invariant
          Section.

       O. Preserve any Warranty Disclaimers.

     If the Modified Version includes new front-matter sections or
     appendices that qualify as Secondary Sections and contain no
     material copied from the Document, you may at your option
     designate some or all of these sections as invariant.  To do this,
     add their titles to the list of Invariant Sections in the Modified
     Version's license notice.  These titles must be distinct from any
     other section titles.

     You may add a section Entitled "Endorsements", provided it contains
     nothing but endorsements of your Modified Version by various
     parties--for example, statements of peer review or that the text
     has been approved by an organization as the authoritative
     definition of a standard.

     You may add a passage of up to five words as a Front-Cover Text,
     and a passage of up to 25 words as a Back-Cover Text, to the end
     of the list of Cover Texts in the Modified Version.  Only one
     passage of Front-Cover Text and one of Back-Cover Text may be
     added by (or through arrangements made by) any one entity.  If the
     Document already includes a cover text for the same cover,
     previously added by you or by arrangement made by the same entity
     you are acting on behalf of, you may not add another; but you may
     replace the old one, on explicit permission from the previous
     publisher that added the old one.

     The author(s) and publisher(s) of the Document do not by this
     License give permission to use their names for publicity for or to
     assert or imply endorsement of any Modified Version.

  5. COMBINING DOCUMENTS

     You may combine the Document with other documents released under
     this License, under the terms defined in section 4 above for
     modified versions, provided that you include in the combination
     all of the Invariant Sections of all of the original documents,
     unmodified, and list them all as Invariant Sections of your
     combined work in its license notice, and that you preserve all
     their Warranty Disclaimers.

     The combined work need only contain one copy of this License, and
     multiple identical Invariant Sections may be replaced with a single
     copy.  If there are multiple Invariant Sections with the same name
     but different contents, make the title of each such section unique
     by adding at the end of it, in parentheses, the name of the
     original author or publisher of that section if known, or else a
     unique number.  Make the same adjustment to the section titles in
     the list of Invariant Sections in the license notice of the
     combined work.

     In the combination, you must combine any sections Entitled
     "History" in the various original documents, forming one section
     Entitled "History"; likewise combine any sections Entitled
     "Acknowledgements", and any sections Entitled "Dedications".  You
     must delete all sections Entitled "Endorsements."

  6. COLLECTIONS OF DOCUMENTS

     You may make a collection consisting of the Document and other
     documents released under this License, and replace the individual
     copies of this License in the various documents with a single copy
     that is included in the collection, provided that you follow the
     rules of this License for verbatim copying of each of the
     documents in all other respects.

     You may extract a single document from such a collection, and
     distribute it individually under this License, provided you insert
     a copy of this License into the extracted document, and follow
     this License in all other respects regarding verbatim copying of
     that document.

  7. AGGREGATION WITH INDEPENDENT WORKS

     A compilation of the Document or its derivatives with other
     separate and independent documents or works, in or on a volume of
     a storage or distribution medium, is called an "aggregate" if the
     copyright resulting from the compilation is not used to limit the
     legal rights of the compilation's users beyond what the individual
     works permit.  When the Document is included in an aggregate, this
     License does not apply to the other works in the aggregate which
     are not themselves derivative works of the Document.

     If the Cover Text requirement of section 3 is applicable to these
     copies of the Document, then if the Document is less than one half
     of the entire aggregate, the Document's Cover Texts may be placed
     on covers that bracket the Document within the aggregate, or the
     electronic equivalent of covers if the Document is in electronic
     form.  Otherwise they must appear on printed covers that bracket
     the whole aggregate.

  8. TRANSLATION

     Translation is considered a kind of modification, so you may
     distribute translations of the Document under the terms of section
     4.  Replacing Invariant Sections with translations requires special
     permission from their copyright holders, but you may include
     translations of some or all Invariant Sections in addition to the
     original versions of these Invariant Sections.  You may include a
     translation of this License, and all the license notices in the
     Document, and any Warranty Disclaimers, provided that you also
     include the original English version of this License and the
     original versions of those notices and disclaimers.  In case of a
     disagreement between the translation and the original version of
     this License or a notice or disclaimer, the original version will
     prevail.

     If a section in the Document is Entitled "Acknowledgements",
     "Dedications", or "History", the requirement (section 4) to
     Preserve its Title (section 1) will typically require changing the
     actual title.

  9. TERMINATION

     You may not copy, modify, sublicense, or distribute the Document
     except as expressly provided for under this License.  Any other
     attempt to copy, modify, sublicense or distribute the Document is
     void, and will automatically terminate your rights under this
     License.  However, parties who have received copies, or rights,
     from you under this License will not have their licenses
     terminated so long as such parties remain in full compliance.

 10. FUTURE REVISIONS OF THIS LICENSE

     The Free Software Foundation may publish new, revised versions of
     the GNU Free Documentation License from time to time.  Such new
     versions will be similar in spirit to the present version, but may
     differ in detail to address new problems or concerns.  See
     `http://www.gnu.org/copyleft/'.

     Each version of the License is given a distinguishing version
     number.  If the Document specifies that a particular numbered
     version of this License "or any later version" applies to it, you
     have the option of following the terms and conditions either of
     that specified version or of any later version that has been
     published (not as a draft) by the Free Software Foundation.  If
     the Document does not specify a version number of this License,
     you may choose any version ever published (not as a draft) by the
     Free Software Foundation.

@end verbatim

@node Index
@unnumbered Index

@printindex cp

@bye



@ignore
   arch-tag: 7a4de539-117c-4658-b799-0b9e3d0ccec0
@end ignore