Merge tag 'v0.9.7' into stable

Release v0.9.7

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diff --git a/doc/Plugin-System.md b/doc/Plugin-System.md
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-#Plugin System
-> Note: Plugin current status - in development (not merged into master).
-
-[**I am a developer.** Developer API.](#developer-api)[](.html)
-
-[**I am a template designer.** Guide for template designer.](#guide-for-template-designer)[](.html)
-
-## Developer API
-
-### What can I do with plugins?
-
-The plugin system let you:
-
-  * insert content into specific places across templates.
-  * alter data before templates rendering.
-  * alter data before saving new links.
-
-### How can I create a plugin for Shaarli?
-
-First, chose a plugin name, such as `demo_plugin`.
-
-Under `plugin` folder, create a folder named with your plugin name. Then create a <plugin_name>.php file in that folder.
-
-You should have the following tree view:
-
-```
-| index.php
-| plugins/
-|---| demo_plugin/
-|   |---| demo_plugin.php
-```
-
-### Understanding hooks
-
-A plugin is a set of functions. Each function will be triggered by the plugin system at certain point in Shaarli execution.
-
-These functions need to be named with this pattern:
-
-```
-hook_<plugin_name>_<hook_name>
-```
-
-For exemple, if my plugin want to add data to the header, this function is needed:
-
-    hook_demo_plugin_render_header()
-
-If this function is declared, and the plugin enabled, it will be called every time Shaarli is rendering the header.
-
-### Plugin's data
-
-#### Parameters
-
-Every hook function has a `$data` parameter. Its content differs for each hooks.
-
-**This parameter needs to be returned every time**, otherwise data is lost.
-
-    return $data;
-
-#### Filling templates placeholder
-
-Template placeholders are displayed in template in specific places.
-
-RainTPL displays every element contained in the placeholder's array. These element can be added by plugins.
-
-For example, let's add a value in the placeholder `top_placeholder` which is displayed at the top of my page:
-
-```php
-$data['top_placeholder'[] = 'My content';](]-=-'My-content';.html)
-# OR
-array_push($data['top_placeholder'], 'My', 'content');[](.html)
-
-return $data;
-```
-
-#### Data manipulation
-
-When a page is displayed, every variable send to the template engine is passed to plugins before that in `$data`.
-
-The data contained by this array can be altered before template rendering.
-
-For exemple, in linklist, it is possible to alter every title:
-
-```php
-// mind the reference if you want $data to be altered
-foreach ($data['links'] as &$value) {[](.html)
-    // String reverse every title.
-    $value['title'] = strrev($value['title']);[](.html)
-}
-
-return $data;
-```
-
-### Metadata
-
-Every plugin needs a `<plugin_name>.meta` file, which is in fact an `.ini` file (`KEY="VALUE"`), to be listed in plugin administration.
-
-Each file contain two keys:
-
-  * `description`: plugin description
-  * `parameters`: user parameter names, separated by a `;`.
-
-> Note: In PHP, `parse_ini_file()` seems to want strings to be between by quotes `"` in the ini file.
-
-### It's not working!
-
-Use `demo_plugin` as a functional example. It covers most of the plugin system features.
-
-If it's still not working, please [open an issue](https://github.com/shaarli/Shaarli/issues/new).[](.html)
-
-### Hooks
-
-| Hooks         | Description   |
-| ------------- |:-------------:|
-| [render_header](#render_header) | Allow plugin to add content in page headers. |[](.html)
-| [render_includes](#render_includes) | Allow plugin to include their own CSS files. |[](.html)
-| [render_footer](#render_footer) | Allow plugin to add content in page footer and include their own JS files. | [](.html)
-| [render_linklist](#render_linklist) | It allows to add content at the begining and end of the page, after every link displayed and to alter link data. |[](.html)
-| [render_editlink](#render_editlink) |  Allow to add fields in the form, or display elements. |[](.html)
-| [render_tools](#render_tools) |  Allow to add content at the end of the page. |[](.html)
-| [render_picwall](#render_picwall) |  Allow to add content at the top and bottom of the page. |[](.html)
-| [render_tagcloud](#render_tagcloud) |  Allow to add content at the top and bottom of the page. |[](.html)
-| [render_daily](#render_daily) |  Allow to add content at the top and bottom of the page, the bottom of each link and to alter data. |[](.html)
-| [savelink](#savelink) | Allow to alter the link being saved in the datastore. |[](.html)
-
-
-#### render_header
-
-Triggered on every page.
-
-Allow plugin to add content in page headers.
-
-##### Data
-
-`$data` is an array containing:
-
-  * `_PAGE_`: current target page (eg: `linklist`, `picwall`, etc.).
-  * `_LOGGEDIN_`: true if user is logged in, false otherwise.
-
-##### Template placeholders
-
-Items can be displayed in templates by adding an entry in `$data['<placeholder>']` array.[](.html)
-
-List of placeholders:
-
-  * `buttons_toolbar`: after the list of buttons in the header.
-
-![buttons_toolbar_example](http://i.imgur.com/ssJUOrt.png)[](.html)
-
-  * `fields_toolbar`: after search fields in the header.
-
-> Note: This will only be called in linklist.
-
-![fields_toolbar_example](http://i.imgur.com/3GMifI2.png)[](.html)
-
-#### render_includes
-
-Triggered on every page.
-
-Allow plugin to include their own CSS files.
-
-##### Data
-
-`$data` is an array containing:
-
-  * `_PAGE_`: current target page (eg: `linklist`, `picwall`, etc.).
-  * `_LOGGEDIN_`: true if user is logged in, false otherwise.
-
-##### Template placeholders
-
-Items can be displayed in templates by adding an entry in `$data['<placeholder>']` array.[](.html)
-
-List of placeholders:
-
-  * `css_files`: called after loading default CSS.
-
-> Note: only add the path of the CSS file. E.g: `plugins/demo_plugin/custom_demo.css`.
-
-#### render_footer
-
-Triggered on every page.
-
-Allow plugin to add content in page footer and include their own JS files.
-
-##### Data
-
-`$data` is an array containing:
-
-  * `_PAGE_`: current target page (eg: `linklist`, `picwall`, etc.).
-  * `_LOGGEDIN_`: true if user is logged in, false otherwise.
-
-##### Template placeholders
-
-Items can be displayed in templates by adding an entry in `$data['<placeholder>']` array.[](.html)
-
-List of placeholders:
-
-  * `text`: called after the end of the footer text.
-  * `endofpage`: called at the end of the page.
-
-![text_example](http://i.imgur.com/L5S2YEH.png)[](.html)
-
-  * `js_files`: called at the end of the page, to include custom JS scripts.
-
-> Note: only add the path of the JS file. E.g: `plugins/demo_plugin/custom_demo.js`.
-
-#### render_linklist
-
-Triggered when `linklist` is displayed (list of links, permalink, search, tag filtered, etc.).
-
-It allows to add content at the begining and end of the page, after every link displayed and to alter link data.
-
-##### Data
-
-`$data` is an array containing:
-
-  * `_LOGGEDIN_`: true if user is logged in, false otherwise.
-  * All templates data, including links.
-
-##### Template placeholders
-
-Items can be displayed in templates by adding an entry in `$data['<placeholder>']` array.[](.html)
-
-List of placeholders:
-
-  * `action_plugin`: next to the button "private only" at the top and bottom of the page.
-
-![action_plugin_example](http://i.imgur.com/Q12PWg0.png)[](.html)
-
-  * `link_plugin`: for every link, between permalink and link URL.
-
-![link_plugin_example](http://i.imgur.com/3oDPhWx.png)[](.html)
-
-  * `plugin_start_zone`: before displaying the template content.
-
-![plugin_start_zone_example](http://i.imgur.com/OVBkGy3.png)[](.html)
-
-  * `plugin_end_zone`: after displaying the template content.
-
-![plugin_end_zone_example](http://i.imgur.com/6IoRuop.png)[](.html)
-
-#### render_editlink
-
-Triggered when the link edition form is displayed.
-
-Allow to add fields in the form, or display elements.
-
-##### Data
-
-`$data` is an array containing:
-
-  * All templates data.
-
-##### Template placeholders
-
-Items can be displayed in templates by adding an entry in `$data['<placeholder>']` array.[](.html)
-
-List of placeholders:
-
-  * `edit_link_plugin`: after tags field.
-
-![edit_link_plugin_example](http://i.imgur.com/5u17Ens.png)[](.html)
-
-#### render_tools
-
-Triggered when the "tools" page is displayed.
-
-Allow to add content at the end of the page.
-
-##### Data
-
-`$data` is an array containing:
-
-  * All templates data.
-
-##### Template placeholders
-
-Items can be displayed in templates by adding an entry in `$data['<placeholder>']` array.[](.html)
-
-List of placeholders:
-
-  * `tools_plugin`: at the end of the page.
-
-![tools_plugin_example](http://i.imgur.com/Bqhu9oQ.png)[](.html)
-
-#### render_picwall
-
-Triggered when picwall is displayed.
-
-Allow to add content at the top and bottom of the page.
-
-##### Data
-
-`$data` is an array containing:
-
-  * `_LOGGEDIN_`: true if user is logged in, false otherwise.
-  * All templates data.
-
-##### Template placeholders
-
-Items can be displayed in templates by adding an entry in `$data['<placeholder>']` array.[](.html)
-
-List of placeholders:
-
-  * `plugin_start_zone`: before displaying the template content.
-
-  * `plugin_end_zone`: after displaying the template content.
-
-![plugin_start_end_zone_example](http://i.imgur.com/tVTQFER.png)[](.html)
-
-#### render_tagcloud
-
-Triggered when tagcloud is displayed.
-
-Allow to add content at the top and bottom of the page.
-
-##### Data
-
-`$data` is an array containing:
-
-  * `_LOGGEDIN_`: true if user is logged in, false otherwise.
-  * All templates data.
-
-##### Template placeholders
-
-Items can be displayed in templates by adding an entry in `$data['<placeholder>']` array.[](.html)
-
-List of placeholders:
-
-  * `plugin_start_zone`: before displaying the template content.
-
-  * `plugin_end_zone`: after displaying the template content.
-
-![plugin_start_end_zone_example](http://i.imgur.com/vHmyT3a.png)[](.html)
-
-#### render_daily
-
-Triggered when tagcloud is displayed.
-
-Allow to add content at the top and bottom of the page, the bottom of each link and to alter data.
-
-##### Data
-
-`$data` is an array containing:
-
-  * `_LOGGEDIN_`: true if user is logged in, false otherwise.
-  * All templates data, including links.
-
-##### Template placeholders
-
-Items can be displayed in templates by adding an entry in `$data['<placeholder>']` array.[](.html)
-
-List of placeholders:
-
-  * `link_plugin`: used at bottom of each link.
-
-![link_plugin_example](http://i.imgur.com/hzhMfSZ.png)[](.html)
-
-  * `plugin_start_zone`: before displaying the template content.
-
-  * `plugin_end_zone`: after displaying the template content.
-
-#### savelink
-
-Triggered when a link is save (new link or edit).
-
-Allow to alter the link being saved in the datastore.
-
-##### Data
-
-`$data` is an array containing the link being saved:
-
-  * title
-  * url
-  * description
-  * linkdate
-  * private
-  * tags
-
-## Guide for template designer
-
-### Plugin administration
-
-Your theme must include a plugin administration page: `pluginsadmin.html`.
-
-> Note: repo's template link needs to be added when the PR is merged.
-
-Use the default one as an example.
-
-Aside from classic RainTPL loops, plugins order is handle by JavaScript. You can just include `plugin_admin.js`, only if:
-
-  * you're using a table.
-  * you call orderUp() and orderUp() onclick on arrows.
-  * you add data-line and data-order to your rows.
-
-Otherwise, you can use your own JS as long as this field is send by the form:
-
-<input type="hidden" name="order_{$key}" value="{$counter}">
-
-### Placeholder system
-
-In order to make plugins work with every custom themes, you need to add variable placeholder in your templates. 
-
-It's a RainTPL loop like this:
-
-    {loop="$plugin_variable"}
-        {$value}
-    {/loop}
-
-You should enable `demo_plugin` for testing purpose, since it uses every placeholder available.
-
-### List of placeholders
-
-**page.header.html**
-
-At the end of the menu:
-
-    {loop="$plugins_header.buttons_toolbar"}
-        {$value}
-    {/loop}
-
-At the end of file, before clearing floating blocks:
-
-    {if="!empty($plugin_errors) && isLoggedIn()"}
-        <ul class="errors">
-            {loop="plugin_errors"}
-                <li>{$value}</li>
-            {/loop}
-        </ul>
-    {/if}
-
-**includes.html**
-
-At the end of the file:
-
-```html
-{loop="$plugins_includes.css_files"}
-<link type="text/css" rel="stylesheet" href="{$value}#"/>
-{/loop}
-```
-
-**page.footer.html**
-
-At the end of your footer notes:
-
-```html
-{loop="$plugins_footer.text"}
-     {$value}
-{/loop}
-```
-
-At the end of file:
-
-```html
-{loop="$plugins_footer.js_files"}
-     <script src="{$value}#"></script>
-{/loop}
-```
-
-**linklist.html**
-
-After search fields:
-
-```html
-{loop="$plugins_header.fields_toolbar"}
-     {$value}
-{/loop}
-```
-
-Before displaying the link list (after paging):
-
-```html
-{loop="$plugin_start_zone"}
-     {$value}
-{/loop}
-```
-
-For every links (icons):
-
-```html
-{loop="$value.link_plugin"}
-    <span>{$value}</span>
-{/loop}
-```
-
-Before end paging:
-
-```html
-{loop="$plugin_end_zone"}
-     {$value}
-{/loop}
-```
-
-**linklist.paging.html**
-
-After the "private only" icon:
-
-```html
-{loop="$action_plugin"}
-     {$value}
-{/loop}
-```
-
-**editlink.html**
-
-After tags field:
-
-```html
-{loop="$edit_link_plugin"}
-     {$value}
-{/loop}
-```
-
-**tools.html**
-
-After the last tool:
-
-```html
-{loop="$tools_plugin"}
-     {$value}
-{/loop}
-```
-
-**picwall.html**
-
-Top:
-
-```html
-<div id="plugin_zone_start_picwall" class="plugin_zone">
-    {loop="$plugin_start_zone"}
-        {$value}
-    {/loop}
-</div>
-```
-
-Bottom:
-
-```html
-<div id="plugin_zone_end_picwall" class="plugin_zone">
-    {loop="$plugin_end_zone"}
-        {$value}
-    {/loop}
-</div>
-```
-
-**tagcloud.html**
-
-Top:
-
-```html
-   <div id="plugin_zone_start_tagcloud" class="plugin_zone">
-        {loop="$plugin_start_zone"}
-            {$value}
-        {/loop}
-    </div>
-```
-
-Bottom:
-
-```html
-    <div id="plugin_zone_end_tagcloud" class="plugin_zone">
-        {loop="$plugin_end_zone"}
-            {$value}
-        {/loop}
-    </div>
-```
-
-**daily.html**
-
-Top:
-
-```html
-<div id="plugin_zone_start_picwall" class="plugin_zone">
-     {loop="$plugin_start_zone"}
-         {$value}
-     {/loop}
-</div>
-```
-
-After every link:
-
-```html
-<div class="dailyEntryFooter">
-     {loop="$link.link_plugin"}
-          {$value}
-     {/loop}
-</div>
-```
-
-Bottom:
-
-```html
-<div id="plugin_zone_end_picwall" class="plugin_zone">
-    {loop="$plugin_end_zone"}
-        {$value}
-    {/loop}
-</div>
-```