テキストの改行がそのまま表示に反映されるように、linbreak プラグインを導入することにしました。
以前も導入していたのだが、昨日のDokuWikiリニューアルにより一切合切プラグインをリフレッシュしたため、入れ忘れていました。m(

・・入れてみたのですが、<wrap em>しかし、linebreakを有効にすると、Section Edit時に文字化け・文字欠けが発生するため無効にせざるを得ませんでした。</wrap>日本語環境のみの事象かもしれません。

以下はlinebreakプラグインのページ（[[https://www.dokuwiki.org/plugin:linebreak|リンク]]）の拙訳（しかも途中）です。

====== linebreak plugin ======

---- plugin ----
description: Generate line breaks in output for line breaks in raw wiki data
author     : Christopher Smith
email      : chris@jalakai.co.uk
type       : syntax, action
lastupdate : 2007-01-20
compatible : Weatherwax
depends    :
conflicts  :
similar    :
tags       : typography, !experimental
downloadurl: http://dokuwiki.jalakai.co.uk/plugin-linebreak.zip
----

[[:experimental]]

**Use [[plugin:xbr|xbr]] rather than linebreak.  xbr is a render plugin and replaces the way the DokuWiki renders ordinary text to preserve line breaks.\\ 
Linebreak is a hack from the time before render plugins were possible.\\
Its reported not to work (at least in some wikis) with the latest version of DokuWiki.  I won't be updating it.\\
\\
- [[http://www.freelists.org/post/dokuwiki/Preserve-newlines-but-otherwise-process-normally-how,3?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+freelists-feeds/dokuwiki+(dokuwiki)|Chris]]\\
(author of both xbr and linebreak plugins)**


^ :!: | Packages updated to include functions missing from 2006-03-09 DokuWiki. |

This [[:plugin]] changes the way DokuWiki treats single line break in the raw wiki text - instead of the default behaviour, where the line break is absorbed, it will generate a line break in the HTML output.

This plugin maybe useful for wiki pages which include poetry, song lyrics or other content which is naturally written with meaningful single line breaks.

===== Syntax =====

The plugin will recognize single line breaks in the wiki page.

The plugin also supports two directives which can turn on and turn off generation of line breaks in the output HTML.
  * ''%%~~LINEBREAK~~%%'' will turn on the plugin for the remainder of the current page.
  * ''%%~~NOLINEBREAK~~%%'' will turn off the plugin for the remainder of the current page.

===== Installation =====

Plugin sources: 
  * for DokuWiki rc2006-09-28 and later --- [[http://dokuwiki.jalakai.co.uk/plugin-linebreak.tar.gz|tar.gz format (3k)]], [[http://dokuwiki.jalakai.co.uk/plugin-linebreak.zip|zip format (5k)]]
  * for DokuWiki 2006-03-09 --- [[http://dokuwiki.jalakai.co.uk/plugin-linebreak-2006-03-xx.tar.gz|tar.gz format (2k)]], [[http://dokuwiki.jalakai.co.uk/plugin-linebreak-2006-03-xx.zip|zip format (3k)]]
  * for DokuWiki development version --- [[http://wiki.jalakai.co.uk/repo/dokuwiki/plugins/linebreak|darcs]]

If your wiki uses either the [[plugin:plugin]] manager or the [[plugin:darcs|darcs plugin]] you can use them with the appropriate links above to install the plugin.    

To install the plugin manually, download the source to your plugin folder, ''lib/plugins'', and extract its contents.  That will create a new plugin folder, ''lib/plugins/linebreak'', and install the plugin.

The folder will contain:
  syntax.php                            ; plugin script
  conf/default.php                      ; default configuration setting values
  conf/metadata.php                     ; information for the configuration settings page
  lang/xx/settings.php                  ; language strings for configuration settings page

The plugin is now installed.

===== Configuration =====

The plugin has two configuration settings:

  * ''automatic'' --- bool, default true.  Apply the plugin automatically on every wiki page.  This setting can be overridden using the ''%%~~LINEBREAK~~%%'' and ''%%~~NOLINEBREAK~~%%'' directives.
  * ''in_quotes'' --- bool, default true.  Allow the plugin to recognize line breaks within quotes.  This changes the behaviour of quote syntax slightly - requiring two consecutive line breaks to terminate a quote.

You can override the default values by either modifying ''lib/plugins/linebreak/conf/default.php'' or by adding the setting to your DokuWiki installation local configuration file, ''conf/local.php''.  If adding a setting to your ''local.php'', use the following format:

  $conf['plugin']['linebreak']['<setting name>'] = <new value>;

Depending on your DokuWiki version you may be able to edit these settings from within the ''Configuration Settings'' via the admin menu.

===== Details =====

The plugin consists of five files, only the plugin scripts, [[#syntax.php]] & [[#action.php]], are shown here.

==== syntax.php ====

<code php>
<?php
/**
 * Plugin Linebreak: Inserts a line break
 * 
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Christopher Smith <chris@jalakai.co.uk>
 */

// must be run within Dokuwiki
if(!defined('DOKU_INC')) die();

if(!defined('DOKU_PLUGIN')) define('DOKU_PLUGIN',DOKU_INC.'lib/plugins/');
require_once(DOKU_PLUGIN.'syntax.php');

/**
 * All DokuWiki plugins to extend the parser/rendering mechanism
 * need to inherit from this class
 */
class syntax_plugin_linebreak extends DokuWiki_Syntax_Plugin {

    var $no_quotes = array(300, '(?<!^|\n)\n(?!\n)');
    var $in_quotes = array(100, '(?<!^|\n)\n(?!\n|>)');
#    var $no_quotes = array(300, '(?<!\n)\n(?!\n)');
#    var $in_quotes = array(100, '(?<!\n)\n(?!\n|>)');
    var $ptn_pageon = '~~LINEBREAK~~';
    var $ptn_pageoff = '~~NOLINEBREAK~~';
 
    function getInfo(){
      return array(
        'author' => 'Christopher Smith',
        'email'  => 'chris@jalakai.co.uk',
        'date'   => '2007-01-20',
        'name'   => 'Linebreak Plugin',
        'desc'   => 'Provide a line break for a new line in the raw wiki data',
        'url'    => 'http://www.dokuwiki.org/plugin:linebreak',
      );
    }
 
    function getType() { return 'substition'; }
    function getSort() { return ($this->getConf('in_quotes') ? $this->in_quotes[0] : $this->no_quotes[0]); }
    function connectTo($mode) {

       $ptn = $this->getConf('in_quotes') ?  $this->in_quotes[1] : $this->no_quotes[1];
       $this->Lexer->addSpecialPattern($ptn,$mode,'plugin_linebreak');

       $this->Lexer->addSpecialPattern($this->ptn_pageon,$mode,'plugin_linebreak');
       $this->Lexer->addSpecialPattern($this->ptn_pageoff,$mode,'plugin_linebreak');

       $this->Lexer->addSpecialPattern('~~LINEBREAK#.+~~\n',$mode,'plugin_linebreak');
    }

    function handle($match, $state, $pos, &$handler){ 

      if (substr($match, 0, 12) == '~~LINEBREAK#') {
        $marker = substr($match, 12,-3);
        return array('marker' => $marker);
      }

      if (!isset($handler->status['plugin_linebreak'])) {
        $handler->status['plugin_linebreak'] = $this->getConf('automatic');
      }

      if ($match == "\n") return array($handler->status['plugin_linebreak']);

      if ($match == $this->ptn_pageon) {
        $handler->status['plugin_linebreak'] = true;
      } else if ($match == $this->ptn_pageoff) {
        $handler->status['plugin_linebreak'] = false;
      }

      return array(false);
    }

    function render($mode, &$renderer, $data) {

      if($mode == 'xhtml'){
          if ($data[0]) $renderer->doc .= "<br />";
          return true;
      }
      return false;
    }

}
</code>

==== action.php ====

**Note** This file is not present in the version of the plugin for DokuWiki release 2006-03-xx.  That particular version of DokuWiki precedes [[devel:Action Plugin|action]].

<code php>
<?php
/**
 * Plugin Linebreak: Inserts a line break
 * 
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Christopher Smith <chris@jalakai.co.uk>
 */

// must be run within Dokuwiki
if(!defined('DOKU_INC')) die();

if(!defined('DOKU_PLUGIN')) define('DOKU_PLUGIN',DOKU_INC.'lib/plugins/');
require_once(DOKU_PLUGIN.'action.php');

/**
 * All DokuWiki plugins to extend the parser/rendering mechanism
 * need to inherit from this class
 */
class action_plugin_linebreak extends DokuWiki_Action_Plugin {

    var $marker_id = 0;
    var $linebreak_conversions = array();

    /**
     * return some info
     */
    function getInfo(){
      return array(
        'author' => 'Christopher Smith',
        'email'  => 'chris@jalakai.co.uk',
        'date'   => '2007-02-18',
        'name'   => 'Linebreak Plugin',
        'desc'   => 'Provide a line break for a new line in the raw wiki data',
        'url'    => 'http://www.dokuwiki.org/plugin:linebreak',
      );
    }

    /**
     * plugin should use this method to register its handlers with the DokuWiki's event controller
     */
    function register(Doku_Event_Handler $controller) {
      $controller->register_hook('PARSER_WIKITEXT_PREPROCESS', 'BEFORE',  $this, '_addspaces', NULL);
      $controller->register_hook('PARSER_HANDLER_DONE','BEFORE', $this, '_fixsecedit', NULL);
    }

    /**
     * add spaces before line breaks, required so syntax component pattern will match correctly
     * record the offset changes so we can fix up the section edit offsets later
     */
    function _addspaces(&$event, $param) {

      // preg pattern used to find line breaks which require spaces inserted before them
      $pattern = '/(?!< )(\n+|$)/';

      // marker to add at the start of the raw wiki data, it contains an id we use to access the location
      // of the additional spaces added into the file
      $marker = "~~LINEBREAK#{$this->marker_id}~~\n";

      // get the location (offset) of all the spaces to be added
      $linebreaks = array();
      preg_match_all($pattern, $event->data, $linebreaks, PREG_OFFSET_CAPTURE);

      for ($i=0; $i<count($linebreaks[0]); $i++) {
        $conversion[] = $linebreaks[0][$i][1];
      }

      // save details of the added spaces
      $this->linebreak_conversions[$this->marker_id] = $conversion;

      // add in the spaces
      $event->data = $marker.preg_replace($pattern,' $1',$event->data);

      // update the marker id so that the next use gets a fresh id.
      $this->marker_id++;
    }

    function _fixsecedit(&$event, $param) {

      // find our linebreak marker instruction and get the marker id
      $calls =& $event->data->calls;
      $marker = null;

      for ($i=0; $i < count($calls); $i++) {
        if ($calls[$i][0] == 'plugin' && $calls[$i][1][0] == 'linebreak' && isset($calls[$i][1][1]['marker'])) {
          $marker = $calls[$i][1][1]['marker'];
          break;
        }
      }

      if (is_null($marker)) return;

      // calculate the amount added to the start of the raw wiki data for our marker tag
      $this->base_delta = strlen("~~LINEBREAK#$marker~~\n");
      $this->current_marker = $marker;

      // iterate through the instruction list and set the file offset values (usually the $pos variable)
      // back to the values they would be if no spaces had been added by this plugin
      for ($i=0; $i < count($calls); $i++) {
        if ($calls[$i][0] == 'section_edit') {
          $calls[$i][1][0] = $this->_convert($calls[$i][1][0]);
          $calls[$i][1][1] = $this->_convert($calls[$i][1][1]);
          $calls[$i][2] = $this->_convert($calls[$i][2]);
        } else {
//          $calls[$i][2] = $this->_convert($calls[$i][2]);
        }
      }
    }

    /**
     *  convert modified raw wiki offset value ($pos) back to the unmodified value
     */
    function _convert($pos) {
      global $debug;

      // file start values will still be file start values - don't change them
      if ($pos <= 1) return $pos;

      $pos -= $this->base_delta;
      if ($pos < 0) return 0;

      // simplify access to the conversion data
      $conversion =& $this->linebreak_conversions[$this->current_marker];

      for ($i=0; $i<count($conversion); $i++) {
        // the conversion contains the original source position
        // we need to add in the modifications up to that point and compare against $pos
        // remembering we have already modified $pos for the marker string we added first
        if ($conversion[$i] + $i >= $pos) {
          return $pos - $i;
        }
      }

      // $i will be one more than the number of modifications made
      return $pos - $i -1;
    }

}

//Setup VIM: ex: et ts=4 enc=utf-8 :}
</code>

===== Revision History =====

  * 2007-02-18 
    * Fix problems with wiki pages which don't end with a new line.
    * Efficiency improvements, action component change to only update instruction position value for section instructions.
  * 2007-01-20 --- Fix problems with section editing
  * 2006-06-09 --- Package updated to match DokuWiki release version
    * ''getConf()'' and supporting methods added to plugin class to overcome missing method issues
    * darcs version released (as previous version, i.e., without ''getConf()'' overloading)
  * 2006-05-26 --- Updated
    * Configuration settings added, see [[#configuration]]
    * ''%%~~LINEBREAK~~%%'' & ''%%~~NOLINEBREAK~~%%'' directives added.
    * Pattern modified to avoid clashing with quotes and to recognize line breaks within quotes.
  * 2006-05-25 --- Released.


===== To Do =====



===== Bugs =====

:!: Often, when I have the plugin installed: pages will not load, and I get this error:

<code>
Fatal error: Maximum execution time of 30 seconds exceeded in /var/www/wiki/lib/plugins/linebreak/action.php on line 98
</code>

or 

<code>
Fatal error: Maximum execution time of 30 seconds exceeded in /var/www/wiki/lib/plugins/linebreak/action.php on line 124
</code>

It may have to do with the size of the file. It seem to choke of files over 1300 lines.

----
  * Plugin works mostly fine for me, but lines don't break when they end with a markup symbol, For example: <file>This is a test **line**
and this is another.</file> The above produces: "This is a test **line** and this is another." With **no** linebreaks. If you remove the bolded text from the example then the line will break as expected. I've tested this with bold, italic, underline and link markup with the same results. - Allen

>> Its an unfortunate side-effect of the way the DokuWiki syntax engine works.  If I alter things to take care of the circumstance you describe, then the plugin will mess up the normal behaviour of double new lines.  You can get around the problem by putting a space after the wiki markup (e.g. %%"** "%%).  Fixing things would make this very "hacky". If it is a key issue for many users of the plugin, I'll take a look at what can be done. --- //[[chris@jalakai.co.uk|Christopher Smith]] 2006-06-19 11:53//

>>> It was quite a surprising behavior for me. I would much prefer there be complexity in my plugin than in my wiki syntax. It's much easier to remember "\n == <br>" than it is to remember "\n == <br>, unless the line ends in markup, in which case <space>\n == <br>". I want to simplify things for my users.//[[bill.mill@gmail.com|Bill Mill]] 2006-07-20//

>>>> //comment updated// New version released for DokuWiki release candidate including the action plugin which removes the need for spaces after markup -- see above. --- //[[chris@jalakai.co.uk|Christopher Smith]] 2006-10-18 22:15//

  * After I updated DokuWiki from 2006-03 to 2006-11 (latest version), linebreak (version 2006-10-18) began to destroy my editing: Every time I tried to edit a section, the beginning and the ending was not recognized and broke (something inserted linebreaks at the beginning and the ending, inside of headings.) I had to erase the plugin (and now its fine again). I miss it... Will there be an update? --- //[[diftong@gmx.net|Patric Schatzmann]] 2006-12-05//

> Yes.  For now, you can either stick to using "Edit Page" rather than "edit section" or stick with the old version of the plugin (requires spaces after DokuWiki syntax codes that appear immediately prior to line endings).  --- //[[chris@jalakai.co.uk|Christopher Smith]] 2006-12-10 03:53//

>> :!: This problem is now fixed --- //[[chris@jalakai.co.uk|Christopher Smith]] 2007-01-20 15:40//

  * In normal pages this linebreak plugin (version 2007-01-20) does exactly what I want. But after a while I realized that some pages don't work. I first thought that Esthers discussion plugin or some other may be faulty, but after deactivating several plugins in the plugin manager I was able to find the plugin that doesn't work right: As soon as I activate the linebreak the wiki:syntax page has no content between the two ''%%<!-- wikipage start --> <!-- wikipage stop -->%%'' markers. Even adding the ''%%~~NOLINEBREAK~~%%'' at the beginning of the page doesn't help. My DokuWiki version is the current 2006-11-06.  --- //[[emodul@gmx.net|eModul]] 2007-02-16 22:12//\\ //Addendum//: I also tried those two configuration options of the plugin, but they only changed the behaviour of my wiki pages. The problem was still there. After deactivating the linebreak even the discussion plugin works.

> The work around is to make sure there is a line break at the end of your page.  I'll look into the cause and release a fix asap. --- //[[chris@jalakai.co.uk|Christopher Smith]] 2007-02-19 02:32//
>> Fix is a simple change to the pattern used by the action component. I have updated source packages and darcs release.  --- //[[chris@jalakai.co.uk|Christopher Smith]] 2007-02-19 02:54//
>>> Thanks. That seems to work now. When looking at the produced HTML source code I simply wonder why there is always a whitespace before every ''%%<br />%%''. When I programmed some PHP I normally put the br tag directly after the last word and added a ''%%\n%%'' for a newline. But that's just for cosmetics.  --- //[[emodul@gmx.net|eModul]] 2007-02-25 22:05//
>>>> The whitespace is added in by the action component to ensure line endings are separated from any DokuWiki syntax by at least one character.  Without that separation this plugin won't work.  I guess, I could then remove the space in the syntax plugin phase, but it doesn't really seem worth the effort. :-)  --- //[[chris@jalakai.co.uk|Christopher Smith]] 2007-02-26 16:50//
>>>>> Ok. Thanks for clarifying this. I'm happy with it as it is. --- //[[emodul@gmx.net|eModul]] 2007-02-28 20:01//

  * Just installed this plug-in (from 2007-01-20), and it breaks the [[plugin:deflist|deflist]] plug-in for me. Proposals?
  * I've noticed that a line break doesn't appear immediately after an unordered list even if I leave a blank line between the list and the following text. It does appear if I put a space on the blank line, though.

  * This is not a real bug, but a feature request. Is it possible to extend the plug-in for double line new paragraphs? I mean when I press 3 enter after a sentence, there will be two empty line in the edit window, but only one in the wiki page. Now I have to do this to get a double empty line in the wiki:<code>

\\
</code>And I would be happier with a second enter instead of the %%\\%%. 2008-07-27 -- PG




===== Discussion =====

IMO: DokuWiki should treat linebreaks as linebreaks, and not require a %%\\%% for a linebreak. 

  - requiring a %%\\%% makes it more difficult to move text files into DokuWiki
  - the source text file looks ugly, cluttered, and unnatural
  - requiring an invisible character at the end of the %%\\%% means I can not just look at my source text file and tell if there is line break or not.

That said, the I don't know if integrating this plugin would be the best solution. In my experience, this plugin causing longer pages to not load. 

> Take a look at [[plugin:xbr]].  It effectively does integrate linebreaks directly into DokuWiki, it uses the newer render plugin type to replace the way DokuWiki handles plain text data.  Where as DokuWiki more or less treats single linebreaks as spaces, [[plugin:xbr]] will replace them with ''<br />'' ensuring the linebreaks are seen as linebreaks on the final web page.  It has a lot going for it over this plugin.  Its more robust, cleaner & faster.  This plugin allows linebreak behaviour to be altered on a page by page basis and even within different areas of a single page. --- //[[chris@jalakai.co.uk|Christopher Smith]] 2008/08/25 11:40//

>> I can not figure out how to use or install the xbr plugin.
>> IMO: the xbr plugin is critically short of basic instruction. A link to the plugin page does not constitute proper documentation. 
>> For example, where does the code specified in the xbr plugin go? /lib/plugins/xbr/syntax.php? lib/plugins/example/renderer.php? Somewhere else?
>> How do I change the configuration manager so that I can change the renderer_xhtml settings in the configuration file? I suppose I have to edit the canRender() function, but which file? Which directory? 
>> I feel like I would have to second guess, and hit-or-miss every step of the way. This is just too difficult to be worth it.

>>> I've improved its instructions in a comment at the bottom of the page. If they need further improvement, please leave a comment on that page. --- //[[chris@jalakai.co.uk|Christopher Smith]] 2008/08/27 03:29//

----

I vote for integration of the plugin into DokuWiki! --- //[[diftong@gmx.net|Patric Schatzmann]] 2006-12-05//


---- 
I find the text syntax of DokuWiki very well, better than Wikipedia.
The only thing witch is really ugly is the linebreak handling. Something so basic should a option in the main code and no plugin should by necessarily for this.
Why doesn't make inquiry by the users?

----
Agree, single linebreak in //source code// should generate a linebreak in HTML result.

----
Agree even more ... my favorite behavior would be to have the described linebreaks for every inserted linebreak and use %%\\%% to turn them off ;)
----
This broke several other plugins for me (code replacement 2, footnote, etc.). Additionally, it did not uninstall correctly, all wiki pages now have ~~LINEBREAK0~~ or something similar on them. Had to search and delete cache files to remove. -- JR 12-06-07
----
Agree, because a plugin never gets the same support like the main code, and problems with updates, incompatibilities and other plugins are possible. And destruction of source text is a very bad effect. (i had problems with linebreak and had to deactivate it. I use now a patch witch change the main code, and had never problems anymore). 20-12-2007
----
Agree, please include in main code -- GB 10-01-08
----
Its always my first plugin in all DokuWiki installations :) -- sw 10-02-08
----
+1 to include in main code -- VR 06-04-08
----
Just installed it... LOVE IT, no more backslash backslash space (however, it will take some time to get it out of my system ;-) ) 29-07-2008 MvD
----
Another vote to include in the main code and/or make it a configuration setting.  My users paste a lot of emails into the wiki.  Instead of just copy/paste it requires a huge amount of time and effort that really is not needed..  CG 12-2-08

----
11-09-10
Linebreak plug-in was working very well until I installed the latest version.

Now when pressing 'edit' button at the middle title after the newest version installed, I can correct only a part of it easily, But it is still printing oddly that the upper and lower part of content/context are broken while the linebreak plug-in is on.

How can I bring into same effect as linebreak is on, NOT using \\ ?

example.

**Source**
<code>
====== test ======

Hello, world.

====== temp ======
</code>


**clicking middle edit button**
<code>

==

Hello, world.

====== temp ===== 
</code>