[simple theme] replace Image_layout.js with flexbox CS impl.

* drop image_layout.js from simple theme
* move image_layout.js to oscar theme and delete common js dir (since its empty now)
* align top position of image detail modal with bottom position of search header
* use flexbox to display images; row height can be set via @results-image-row-height in defenitions.less
* display span title underneath each image with a max width of 12rem
* increase margin and padding around image article on desktop and tablet
* make article height smaller on phone layout (height of 6rem) to display more content on current view
* remove content from result, if the title and content matches
* use a group that cotains the flex image article, if images are mixed with other categories
* fix pylint issues in webapp.py
* use the default.html result template in unit tests (thanks @return42)

12 files changed, 91 insertions, 51 deletions

diff --git a/searx/results.py b/searx/results.py
index 1ac6a5ab5..ab242b838 100644
--- a/searx/results.py
+++ b/searx/results.py
@@ -278,12 +278,18 @@ class ResultContainer:
             result['parsed_url'] = result['parsed_url']._replace(scheme="http")
             result['url'] = result['parsed_url'].geturl()
 
+        # avoid duplicate content between the content and title fields
+        if result.get('content') == result.get('title'):
+            del result['content']
+
+        # make sure there is a template
+        if 'template' not in result:
+            result['template'] = 'default.html'
+
         # strip multiple spaces and cariage returns from content
         if result.get('content'):
             result['content'] = WHITESPACE_REGEX.sub(' ', result['content'])
 
-        return True
-
     def __merge_url_result(self, result, position):
         result['engines'] = set([result['engine']])
         with self._lock:
diff --git a/searx/static/themes/oscar/gruntfile.js b/searx/static/themes/oscar/gruntfile.js
index 2f87e289f..988d42c3d 100644
--- a/searx/static/themes/oscar/gruntfile.js
+++ b/searx/static/themes/oscar/gruntfile.js
@@ -60,7 +60,7 @@ module.exports = function(grunt) {
         separator: ';'
       },
       dist: {
-        src: ['src/js/*.js', '../__common__/js/image_layout.js'],
+        src: ['src/js/*.js'],
         dest: 'js/searxng.js'
       }
     },
diff --git a/searx/static/themes/__common__/js/image_layout.js b/searx/static/themes/oscar/src/js/image_layout.js
index 329fa46a8..c65351f7b 100644
--- a/searx/static/themes/__common__/js/image_layout.js
+++ b/searx/static/themes/oscar/src/js/image_layout.js
@@ -128,7 +128,7 @@
         obj.trottleCallToAlign = null;
       }, 20);
     }
-  }
+  };
 
   ImageLayout.prototype.align = function () {
     var i;
@@ -183,7 +183,7 @@
         img.classList.add('aligned');
       }
     }
-  }
+  };
 
   ImageLayout.prototype.watch = function () {
     var objthrottleAlign = this.throttleAlign.bind(this);
@@ -216,7 +216,7 @@
       subtree: true,
       attributes: false,
       characterData: false,
-    })
+    });
   };
 
   w.searxng.ImageLayout = ImageLayout;
diff --git a/searx/static/themes/simple/gruntfile.js b/searx/static/themes/simple/gruntfile.js
index 52c460494..25883e384 100644
--- a/searx/static/themes/simple/gruntfile.js
+++ b/searx/static/themes/simple/gruntfile.js
@@ -108,7 +108,6 @@ module.exports = function (grunt) {
           'js/searxng.head.min.js': ['src/js/head/*.js'],
           'js/searxng.min.js': [
             'src/js/main/*.js',
-            '../__common__/js/*.js',
             './node_modules/autocomplete-js/dist/autocomplete.js'
           ]
         }
diff --git a/searx/static/themes/simple/src/js/main/results.js b/searx/static/themes/simple/src/js/main/results.js
index 609bd8ecd..4eae58435 100644
--- a/searx/static/themes/simple/src/js/main/results.js
+++ b/searx/static/themes/simple/src/js/main/results.js
@@ -7,9 +7,6 @@
   }
 
   searxng.ready(function () {
-    searxng.image_thumbnail_layout = new searxng.ImageLayout('#urls', '#urls .result-images', 'img.image_thumbnail', 14, 6, 200);
-    searxng.image_thumbnail_layout.watch();
-
     d.querySelectorAll('#urls img.image').forEach(
       img =>
         img.addEventListener(
@@ -74,13 +71,11 @@
         }
       }
       d.getElementById('results').classList.add('image-detail-open');
-      searxng.image_thumbnail_layout.align();
       searxng.scrollPageToSelected();
     }
 
     searxng.closeDetail = function (e) {
       d.getElementById('results').classList.remove('image-detail-open');
-      searxng.image_thumbnail_layout.align();
       searxng.scrollPageToSelected();
     }
     searxng.on('.result-detail-close', 'click', e => {
diff --git a/searx/static/themes/simple/src/less/definitions.less b/searx/static/themes/simple/src/less/definitions.less
index abda5e37c..7de0d7ef9 100644
--- a/searx/static/themes/simple/src/less/definitions.less
+++ b/searx/static/themes/simple/src/less/definitions.less
@@ -68,8 +68,8 @@
   --color-result-search-url-border: #ddd;
   --color-result-search-url-font: #000;
   // Images Colors
-  --color-result-image-span-background-hover: rgba(0, 0, 0, 0.6);
-  --color-result-image-span-font: #fff;
+  --color-result-image-span-font: #444;
+  --color-result-image-span-font-selected: #fff;
   --color-result-image-background: #fff;
   /// Settings Colors
   --color-settings-tr-hover: #f7f7f7;
@@ -179,8 +179,8 @@
   --color-result-detail-loader-border: rgba(255, 255, 255, 0.2);
   --color-result-detail-loader-borderleft: rgba(0, 0, 0, 0);
   // Images Colors
-  --color-result-image-span-background-hover: rgba(0, 0, 0, 0.6);
-  --color-result-image-span-font: #fff;
+  --color-result-image-span-font: #bbb;
+  --color-result-image-span-font-selected: #222;
   --color-result-image-background: #222;
   /// Settings Colors
   --color-settings-tr-hover: #2d2d2d;
@@ -230,9 +230,11 @@
 @results-gap: 5rem;
 @results-margin: 0.125rem;
 @result-padding: 1rem;
+@results-image-row-height: 12rem;
+@results-image-row-height-phone: 6rem;
 @search-width: 40rem;
 // heigh of #search, see detail.less
-@search-height: 7.75rem;
+@search-height: 7.6rem;
 
 /// Device Size
 /// @desktop > @tablet
diff --git a/searx/static/themes/simple/src/less/detail.less b/searx/static/themes/simple/src/less/detail.less
index 5e3cfaca6..b63e65206 100644
--- a/searx/static/themes/simple/src/less/detail.less
+++ b/searx/static/themes/simple/src/less/detail.less
@@ -39,6 +39,7 @@ article.result-images .detail {
       border: none;
       object-fit: contain;
       width: inherit;
+      height: inherit;
       max-width: 100%;
       min-height: inherit;
       max-height: calc(100vh - 25rem - 7rem);
diff --git a/searx/static/themes/simple/src/less/style-rtl.less b/searx/static/themes/simple/src/less/style-rtl.less
index 6d3e9f525..bbaa48748 100644
--- a/searx/static/themes/simple/src/less/style-rtl.less
+++ b/searx/static/themes/simple/src/less/style-rtl.less
@@ -83,6 +83,11 @@
   }
 }
 
+// Image flexbox
+#main_results div#results.only_template_images #urls {
+  direction: rtl;
+}
+
 // Image detail
 #results.image-detail-open article.result-images[data-vim-selected] .detail .result-images-labels p {
   direction: rtl;
diff --git a/searx/static/themes/simple/src/less/style.less b/searx/static/themes/simple/src/less/style.less
index 29cf554b0..7640b253c 100644
--- a/searx/static/themes/simple/src/less/style.less
+++ b/searx/static/themes/simple/src/less/style.less
@@ -143,6 +143,10 @@ article.result-images[data-vim-selected] {
   .image_thumbnail {
     filter: opacity(60%);
   }
+
+  span.title {
+    color: var(--color-result-image-span-font-selected);
+  }
 }
 
 article[data-vim-selected].category-videos,
@@ -284,6 +288,16 @@ article[data-vim-selected].category-social {
   }
 }
 
+.template_group_images {
+  display: flex;
+  flex-wrap: wrap;
+}
+
+.template_group_images::after {
+  flex-grow: 10;
+  content: "";
+}
+
 .category-videos,
 .category-news,
 .category-map,
@@ -357,40 +371,38 @@ article[data-vim-selected].category-social {
 }
 
 .result-images {
-  display: inline-block;
-  margin: 0;
-  padding: 0;
-  position: relative;
-  max-height: 200px;
+  flex-grow: 1;
+  padding: 0.5rem 0.5rem 2rem 0.5rem;
+  margin: 0.25rem;
   border: none !important;
+  height: @results-image-row-height;
+
+  & > a {
+    position: relative;
+  }
 
   img {
-    float: inherit;
-    margin: 0.125rem;
+    margin: 0;
     padding: 0;
     border: none;
-    max-height: 200px;
+    height: 100%;
+    width: 100%;
+    object-fit: cover;
+    vertical-align: bottom;
     background: var(--color-result-image-background);
   }
 
   span.title {
-    display: none;
-    color: var(--color-result-image-span-font);
-  }
-
-  &:hover span.title {
     display: block;
     position: absolute;
-    bottom: 0;
-    .ltr-right(0);
-    padding: 4px;
-    margin-top: 0;
-    .ltr-margin-right(0);
-    margin-bottom: 4px;
-    .ltr-margin-left(4px);
-    // color: @color-result-image-span-font;
-    background-color: var(--color-result-image-span-background-hover);
-    font-size: 0.7em;
+
+    width: 100%;
+    font-size: 0.9rem;
+    color: var(--color-result-image-span-font);
+    padding: 0.5rem 0 0 0;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
   }
 }
 
@@ -785,8 +797,14 @@ article[data-vim-selected].category-social {
   }
 
   #urls {
-    width: inherit;
     margin: 0;
+    display: flex;
+    flex-wrap: wrap;
+  }
+
+  #urls::after {
+    flex-grow: 10;
+    content: "";
   }
 
   #backToTop {
@@ -837,8 +855,7 @@ article[data-vim-selected].category-social {
 
   .result-images {
     margin: 0;
-    padding: 0;
-    border: none;
+    height: @results-image-row-height-phone;
   }
 }
 
diff --git a/searx/templates/simple/results.html b/searx/templates/simple/results.html
index 4149f83c3..ee47db662 100644
--- a/searx/templates/simple/results.html
+++ b/searx/templates/simple/results.html
@@ -15,7 +15,7 @@
 {% if results and results|map(attribute='template')|unique|list|count == 1 %}
   {% set only_template = 'only_template_' + results[0]['template']|default('default')|replace('.html', '') %}
 {% else %}
-  {% set unique_template = '' %}
+  {% set only_template = '' %}
 {% endif %}
 
 <div id="results" class="{{ only_template }}">
@@ -131,12 +131,10 @@
 
     <div id="urls">
     {% for result in results %}
+        {% if result.open_group and not only_template %}<div class="template_group_{{ result['template']|replace('.html', '') }}">{% endif %}
         {% set index = loop.index %}
-        {% if result['template'] %}
-            {% include get_result_template('simple', result['template']) %}
-        {% else %}
-            {% include 'simple/result_templates/default.html' %}
-        {% endif %}
+        {% include get_result_template('simple', result['template']) %}
+        {% if result.close_group and not only_template %}</div>{% endif %}
     {% endfor %}
     {% if not results and not answers %}
         {% include 'simple/messages/no_results.html' %}
diff --git a/searx/webapp.py b/searx/webapp.py
index 1314fc276..df717a7b1 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -726,6 +726,9 @@ def search():
     # Server-Timing header
     request.timings = result_container.get_timings()  # pylint: disable=assigning-non-slot
 
+    current_template = None
+    previous_result = None
+
     # output
     for result in results:
         if output_format == 'html':
@@ -762,6 +765,18 @@ def search():
                 else:
                     result['publishedDate'] = format_date(result['publishedDate'])
 
+        # set result['open_group'] = True when the template changes from the previous result
+        # set result['close_group'] = True when the template changes on the next result
+        if current_template != result.get('template'):
+            result['open_group'] = True
+            if previous_result:
+                previous_result['close_group'] = True  # pylint: disable=unsupported-assignment-operation
+        current_template = result.get('template')
+        previous_result = result
+
+    if previous_result:
+        previous_result['close_group'] = True
+
     if output_format == 'json':
         x = {
             'query': search_query.query,
diff --git a/tests/unit/test_webapp.py b/tests/unit/test_webapp.py
index a50bd5c78..aed6f2dd4 100644
--- a/tests/unit/test_webapp.py
+++ b/tests/unit/test_webapp.py
@@ -33,7 +33,8 @@ class ViewsTestCase(SearxTestCase):
                 'engine': 'startpage',
                 'parsed_url': ParseResult(
                     scheme='http', netloc='first.test.xyz', path='/', params='', query='', fragment=''
-                ),  # noqa
+                ),
+                'template': 'default.html',
             },
             {
                 'content': 'second test content',
@@ -43,7 +44,8 @@ class ViewsTestCase(SearxTestCase):
                 'engine': 'youtube',
                 'parsed_url': ParseResult(
                     scheme='http', netloc='second.test.xyz', path='/', params='', query='', fragment=''
-                ),  # noqa
+                ),
+                'template': 'default.html',
             },
         ]