new pluging, updated some imported files

plugins/slides/README.md

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+Slides for reStructuredText.
+
+This was previously part of Nikola core, but has been downgraded to optional plugin.
+
+Compatible with Nikola v7 and v8, Bootstrap 4. (The v7 version is Bootstrap 3.)
+
+Example:
+
+```
+    .. slides::
+
+       /galleries/demo/tesla_conducts_lg.jpg
+       /galleries/demo/tesla_lightning2_lg.jpg
+       /galleries/demo/tesla4_lg.jpg
+       /galleries/demo/tesla_lightning1_lg.jpg
+       /galleries/demo/tesla_tower1_lg.jpg
+```

plugins/slides/slides.plugin

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+[Core]
+name = rest_slides
+module = slides
+
+[Nikola]
+compiler = rest
+PluginCategory = CompilerExtension
+
+[Documentation]
+author = Roberto Alsina
+version = 0.1
+website = https://plugins.getnikola.com/slides
+description = Slides directive
+

plugins/slides/slides.py

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+# -*- coding: utf-8 -*-
+
+# Copyright © 2012-2018 Roberto Alsina and others.
+
+# Permission is hereby granted, free of charge, to any
+# person obtaining a copy of this software and associated
+# documentation files (the "Software"), to deal in the
+# Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the
+# Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice
+# shall be included in all copies or substantial portions of
+# the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+# OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+"""Slides directive for reStructuredText."""
+
+
+import uuid
+
+from docutils import nodes
+from docutils.parsers.rst import Directive, directives
+
+from nikola.plugin_categories import RestExtension
+
+
+class Plugin(RestExtension):
+    """Plugin for reST slides directive."""
+
+    name = "rest_slides"
+
+    def set_site(self, site):
+        """Set Nikola site."""
+        self.site = site
+        directives.register_directive('slides', Slides)
+        Slides.site = site
+        return super(Plugin, self).set_site(site)
+
+
+class Slides(Directive):
+    """reST extension for inserting slideshows."""
+
+    has_content = True
+
+    def run(self):
+        """Run the slides directive."""
+        if len(self.content) == 0:  # pragma: no cover
+            return
+
+        if self.site.invariant:  # for testing purposes
+            carousel_id = 'slides_' + 'fixedvaluethatisnotauuid'
+        else:
+            carousel_id = 'slides_' + uuid.uuid4().hex
+
+        output = self.site.template_system.render_template(
+            'slides.tmpl',
+            None,
+            {
+                'slides_content': self.content,
+                'carousel_id': carousel_id,
+            }
+        )
+        return [nodes.raw('', output, format='html')]
+
+
+directives.register_directive('slides', Slides)

plugins/slides/templates/jinja2/slides.tmpl

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+{% block content %}
+<div id="{{ carousel_id }}" class="carousel slide" data-ride="carousel">
+    <ol class="carousel-indicators">
+    {% for i in range(slides_content|length) %}
+        {% if i == 0 %}
+            <li data-target="#{{ carousel_id }}" data-slide-to="{{ i }}" class="active"></li>
+        {% else %}
+            <li data-target="#{{ carousel_id }}" data-slide-to="{{ i }}"></li>
+        {% endif %}
+    {% endfor %}
+    </ol>
+    <div class="carousel-inner">
+        {% for image in slides_content %}
+            {% if loop.index0 == 0 %}
+                <div class="carousel-item active"><img class="d-block w-100" src="{{ image }}" alt=""></div>
+            {% else %}
+                <div class="carousel-item"><img class="d-block w-100" src="{{ image }}" alt=""></div>
+            {% endif %}
+        {% endfor %}
+    </div>
+      <a class="carousel-control-prev" href="#{{ carousel_id }}" role="button" data-slide="prev">
+    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
+    <span class="sr-only">Previous</span>
+  </a>
+  <a class="carousel-control-next" href="#{{ carousel_id }}" role="button" data-slide="next">
+    <span class="carousel-control-next-icon" aria-hidden="true"></span>
+    <span class="sr-only">Next</span>
+  </a>
+</div>
+{% endblock %}

plugins/slides/templates/mako/slides.tmpl

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+<%block name="content">
+<div id="${carousel_id}" class="carousel slide" data-ride="carousel">
+    <ol class="carousel-indicators">
+    % for i in range(len(slides_content)):
+        % if i == 0:
+            <li data-target="#${carousel_id}" data-slide-to="${i}" class="active"></li>
+        % else:
+            <li data-target="#${carousel_id}" data-slide-to="${i}"></li>
+        % endif
+    % endfor
+    </ol>
+    <div class="carousel-inner">
+        % for image in slides_content:
+            % if loop.index == 0:
+                <div class="carousel-item active"><img class="d-block w-100" src="${image}" alt=""></div>
+            % else:
+                <div class="carousel-item"><img class="d-block w-100" src="${image}" alt=""></div>
+            % endif
+        % endfor
+    </div>
+      <a class="carousel-control-prev" href="#${carousel_id}" role="button" data-slide="prev">
+    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
+    <span class="sr-only">Previous</span>
+  </a>
+  <a class="carousel-control-next" href="#${carousel_id}" role="button" data-slide="next">
+    <span class="carousel-control-next-icon" aria-hidden="true"></span>
+    <span class="sr-only">Next</span>
+  </a>
+</div>
+</%block>