[feature] dark theme for code highlighter in the result list

Closes: https://github.com/searxng/searxng/issues/1354

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

4 files changed, 237 insertions, 103 deletions

diff --git a/searx/static/themes/simple/src/generated/pygments.less b/searx/static/themes/simple/src/generated/pygments.less
index 083c4f29..d01c777f 100644
--- a/searx/static/themes/simple/src/generated/pygments.less
+++ b/searx/static/themes/simple/src/generated/pygments.less
@@ -3,98 +3,171 @@
    using pygments version 2.16.1
 */
 
-.code-highlight .linenos {
-    -webkit-touch-callout: none;
-    -webkit-user-select: none;
-    -khtml-user-select: none;
-    -moz-user-select: none;
-    -ms-user-select: none;
-    user-select: none;
-    cursor: default;
 
-    &::selection {
-        background: transparent; /* WebKit/Blink Browsers */
-    }
-    &::-moz-selection {
-        background: transparent; /* Gecko Browsers */
-    }
+.code-highlight {
 
-    margin-right: 8px;
-    text-align: right;
+  pre { line-height: 100%; }
+  td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
+  span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
+  td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
+  span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
+  .hll { background-color: #ffffcc }
+  .c { color: #3D7B7B; font-style: italic } /* Comment */
+  .err { border: 1px solid #FF0000 } /* Error */
+  .k { color: #008000; font-weight: bold } /* Keyword */
+  .o { color: #666666 } /* Operator */
+  .ch { color: #3D7B7B; font-style: italic } /* Comment.Hashbang */
+  .cm { color: #3D7B7B; font-style: italic } /* Comment.Multiline */
+  .cp { color: #9C6500 } /* Comment.Preproc */
+  .cpf { color: #3D7B7B; font-style: italic } /* Comment.PreprocFile */
+  .c1 { color: #3D7B7B; font-style: italic } /* Comment.Single */
+  .cs { color: #3D7B7B; font-style: italic } /* Comment.Special */
+  .gd { color: #A00000 } /* Generic.Deleted */
+  .ge { font-style: italic } /* Generic.Emph */
+  .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
+  .gr { color: #E40000 } /* Generic.Error */
+  .gh { color: #000080; font-weight: bold } /* Generic.Heading */
+  .gi { color: #008400 } /* Generic.Inserted */
+  .go { color: #717171 } /* Generic.Output */
+  .gp { color: #000080; font-weight: bold } /* Generic.Prompt */
+  .gs { font-weight: bold } /* Generic.Strong */
+  .gu { color: #800080; font-weight: bold } /* Generic.Subheading */
+  .gt { color: #0044DD } /* Generic.Traceback */
+  .kc { color: #008000; font-weight: bold } /* Keyword.Constant */
+  .kd { color: #008000; font-weight: bold } /* Keyword.Declaration */
+  .kn { color: #008000; font-weight: bold } /* Keyword.Namespace */
+  .kp { color: #008000 } /* Keyword.Pseudo */
+  .kr { color: #008000; font-weight: bold } /* Keyword.Reserved */
+  .kt { color: #B00040 } /* Keyword.Type */
+  .m { color: #666666 } /* Literal.Number */
+  .s { color: #BA2121 } /* Literal.String */
+  .na { color: #687822 } /* Name.Attribute */
+  .nb { color: #008000 } /* Name.Builtin */
+  .nc { color: #0000FF; font-weight: bold } /* Name.Class */
+  .no { color: #880000 } /* Name.Constant */
+  .nd { color: #AA22FF } /* Name.Decorator */
+  .ni { color: #717171; font-weight: bold } /* Name.Entity */
+  .ne { color: #CB3F38; font-weight: bold } /* Name.Exception */
+  .nf { color: #0000FF } /* Name.Function */
+  .nl { color: #767600 } /* Name.Label */
+  .nn { color: #0000FF; font-weight: bold } /* Name.Namespace */
+  .nt { color: #008000; font-weight: bold } /* Name.Tag */
+  .nv { color: #19177C } /* Name.Variable */
+  .ow { color: #AA22FF; font-weight: bold } /* Operator.Word */
+  .w { color: #bbbbbb } /* Text.Whitespace */
+  .mb { color: #666666 } /* Literal.Number.Bin */
+  .mf { color: #666666 } /* Literal.Number.Float */
+  .mh { color: #666666 } /* Literal.Number.Hex */
+  .mi { color: #666666 } /* Literal.Number.Integer */
+  .mo { color: #666666 } /* Literal.Number.Oct */
+  .sa { color: #BA2121 } /* Literal.String.Affix */
+  .sb { color: #BA2121 } /* Literal.String.Backtick */
+  .sc { color: #BA2121 } /* Literal.String.Char */
+  .dl { color: #BA2121 } /* Literal.String.Delimiter */
+  .sd { color: #BA2121; font-style: italic } /* Literal.String.Doc */
+  .s2 { color: #BA2121 } /* Literal.String.Double */
+  .se { color: #AA5D1F; font-weight: bold } /* Literal.String.Escape */
+  .sh { color: #BA2121 } /* Literal.String.Heredoc */
+  .si { color: #A45A77; font-weight: bold } /* Literal.String.Interpol */
+  .sx { color: #008000 } /* Literal.String.Other */
+  .sr { color: #A45A77 } /* Literal.String.Regex */
+  .s1 { color: #BA2121 } /* Literal.String.Single */
+  .ss { color: #19177C } /* Literal.String.Symbol */
+  .bp { color: #008000 } /* Name.Builtin.Pseudo */
+  .fm { color: #0000FF } /* Name.Function.Magic */
+  .vc { color: #19177C } /* Name.Variable.Class */
+  .vg { color: #19177C } /* Name.Variable.Global */
+  .vi { color: #19177C } /* Name.Variable.Instance */
+  .vm { color: #19177C } /* Name.Variable.Magic */
+  .il { color: #666666 } /* Literal.Number.Integer.Long */
 }
 
-.code-highlight pre { line-height: 125%; }
-.code-highlight td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-.code-highlight span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
-.code-highlight td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
-.code-highlight span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
-.code-highlight .hll { background-color: #ffffcc }
-.code-highlight { background: #f8f8f8; }
-.code-highlight .c { color: #3D7B7B; font-style: italic } /* Comment */
-.code-highlight .err { border: 1px solid #FF0000 } /* Error */
-.code-highlight .k { color: #008000; font-weight: bold } /* Keyword */
-.code-highlight .o { color: #666666 } /* Operator */
-.code-highlight .ch { color: #3D7B7B; font-style: italic } /* Comment.Hashbang */
-.code-highlight .cm { color: #3D7B7B; font-style: italic } /* Comment.Multiline */
-.code-highlight .cp { color: #9C6500 } /* Comment.Preproc */
-.code-highlight .cpf { color: #3D7B7B; font-style: italic } /* Comment.PreprocFile */
-.code-highlight .c1 { color: #3D7B7B; font-style: italic } /* Comment.Single */
-.code-highlight .cs { color: #3D7B7B; font-style: italic } /* Comment.Special */
-.code-highlight .gd { color: #A00000 } /* Generic.Deleted */
-.code-highlight .ge { font-style: italic } /* Generic.Emph */
-.code-highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
-.code-highlight .gr { color: #E40000 } /* Generic.Error */
-.code-highlight .gh { color: #000080; font-weight: bold } /* Generic.Heading */
-.code-highlight .gi { color: #008400 } /* Generic.Inserted */
-.code-highlight .go { color: #717171 } /* Generic.Output */
-.code-highlight .gp { color: #000080; font-weight: bold } /* Generic.Prompt */
-.code-highlight .gs { font-weight: bold } /* Generic.Strong */
-.code-highlight .gu { color: #800080; font-weight: bold } /* Generic.Subheading */
-.code-highlight .gt { color: #0044DD } /* Generic.Traceback */
-.code-highlight .kc { color: #008000; font-weight: bold } /* Keyword.Constant */
-.code-highlight .kd { color: #008000; font-weight: bold } /* Keyword.Declaration */
-.code-highlight .kn { color: #008000; font-weight: bold } /* Keyword.Namespace */
-.code-highlight .kp { color: #008000 } /* Keyword.Pseudo */
-.code-highlight .kr { color: #008000; font-weight: bold } /* Keyword.Reserved */
-.code-highlight .kt { color: #B00040 } /* Keyword.Type */
-.code-highlight .m { color: #666666 } /* Literal.Number */
-.code-highlight .s { color: #BA2121 } /* Literal.String */
-.code-highlight .na { color: #687822 } /* Name.Attribute */
-.code-highlight .nb { color: #008000 } /* Name.Builtin */
-.code-highlight .nc { color: #0000FF; font-weight: bold } /* Name.Class */
-.code-highlight .no { color: #880000 } /* Name.Constant */
-.code-highlight .nd { color: #AA22FF } /* Name.Decorator */
-.code-highlight .ni { color: #717171; font-weight: bold } /* Name.Entity */
-.code-highlight .ne { color: #CB3F38; font-weight: bold } /* Name.Exception */
-.code-highlight .nf { color: #0000FF } /* Name.Function */
-.code-highlight .nl { color: #767600 } /* Name.Label */
-.code-highlight .nn { color: #0000FF; font-weight: bold } /* Name.Namespace */
-.code-highlight .nt { color: #008000; font-weight: bold } /* Name.Tag */
-.code-highlight .nv { color: #19177C } /* Name.Variable */
-.code-highlight .ow { color: #AA22FF; font-weight: bold } /* Operator.Word */
-.code-highlight .w { color: #bbbbbb } /* Text.Whitespace */
-.code-highlight .mb { color: #666666 } /* Literal.Number.Bin */
-.code-highlight .mf { color: #666666 } /* Literal.Number.Float */
-.code-highlight .mh { color: #666666 } /* Literal.Number.Hex */
-.code-highlight .mi { color: #666666 } /* Literal.Number.Integer */
-.code-highlight .mo { color: #666666 } /* Literal.Number.Oct */
-.code-highlight .sa { color: #BA2121 } /* Literal.String.Affix */
-.code-highlight .sb { color: #BA2121 } /* Literal.String.Backtick */
-.code-highlight .sc { color: #BA2121 } /* Literal.String.Char */
-.code-highlight .dl { color: #BA2121 } /* Literal.String.Delimiter */
-.code-highlight .sd { color: #BA2121; font-style: italic } /* Literal.String.Doc */
-.code-highlight .s2 { color: #BA2121 } /* Literal.String.Double */
-.code-highlight .se { color: #AA5D1F; font-weight: bold } /* Literal.String.Escape */
-.code-highlight .sh { color: #BA2121 } /* Literal.String.Heredoc */
-.code-highlight .si { color: #A45A77; font-weight: bold } /* Literal.String.Interpol */
-.code-highlight .sx { color: #008000 } /* Literal.String.Other */
-.code-highlight .sr { color: #A45A77 } /* Literal.String.Regex */
-.code-highlight .s1 { color: #BA2121 } /* Literal.String.Single */
-.code-highlight .ss { color: #19177C } /* Literal.String.Symbol */
-.code-highlight .bp { color: #008000 } /* Name.Builtin.Pseudo */
-.code-highlight .fm { color: #0000FF } /* Name.Function.Magic */
-.code-highlight .vc { color: #19177C } /* Name.Variable.Class */
-.code-highlight .vg { color: #19177C } /* Name.Variable.Global */
-.code-highlight .vi { color: #19177C } /* Name.Variable.Instance */
-.code-highlight .vm { color: #19177C } /* Name.Variable.Magic */
-.code-highlight .il { color: #666666 } /* Literal.Number.Integer.Long */
+.code-highlight-dark(){
+  .code-highlight {
+
+    pre { line-height: 100%; }
+    td.linenos .normal { color: #3c4354; background-color: transparent; padding-left: 5px; padding-right: 5px; }
+    span.linenos { color: #3c4354; background-color: transparent; padding-left: 5px; padding-right: 5px; }
+    td.linenos .special { color: #3c4354; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
+    span.linenos.special { color: #3c4354; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
+    .hll { background-color: #6e7681 }
+    .c { color: #7e8aa1 } /* Comment */
+    .err { color: #f88f7f } /* Error */
+    .esc { color: #d4d2c8 } /* Escape */
+    .g { color: #d4d2c8 } /* Generic */
+    .k { color: #FFAD66 } /* Keyword */
+    .l { color: #D5FF80 } /* Literal */
+    .n { color: #d4d2c8 } /* Name */
+    .o { color: #FFAD66 } /* Operator */
+    .x { color: #d4d2c8 } /* Other */
+    .p { color: #d4d2c8 } /* Punctuation */
+    .ch { color: #f88f7f; font-style: italic } /* Comment.Hashbang */
+    .cm { color: #7e8aa1 } /* Comment.Multiline */
+    .cp { color: #FFAD66; font-weight: bold } /* Comment.Preproc */
+    .cpf { color: #7e8aa1 } /* Comment.PreprocFile */
+    .c1 { color: #7e8aa1 } /* Comment.Single */
+    .cs { color: #7e8aa1; font-style: italic } /* Comment.Special */
+    .gd { color: #f88f7f; background-color: #3d1e20 } /* Generic.Deleted */
+    .ge { color: #d4d2c8; font-style: italic } /* Generic.Emph */
+    .ges { color: #d4d2c8 } /* Generic.EmphStrong */
+    .gr { color: #f88f7f } /* Generic.Error */
+    .gh { color: #d4d2c8 } /* Generic.Heading */
+    .gi { color: #6ad4af; background-color: #19362c } /* Generic.Inserted */
+    .go { color: #7e8aa1 } /* Generic.Output */
+    .gp { color: #d4d2c8 } /* Generic.Prompt */
+    .gs { color: #d4d2c8; font-weight: bold } /* Generic.Strong */
+    .gu { color: #d4d2c8 } /* Generic.Subheading */
+    .gt { color: #f88f7f } /* Generic.Traceback */
+    .kc { color: #FFAD66 } /* Keyword.Constant */
+    .kd { color: #FFAD66 } /* Keyword.Declaration */
+    .kn { color: #FFAD66 } /* Keyword.Namespace */
+    .kp { color: #FFAD66 } /* Keyword.Pseudo */
+    .kr { color: #FFAD66 } /* Keyword.Reserved */
+    .kt { color: #73D0FF } /* Keyword.Type */
+    .ld { color: #D5FF80 } /* Literal.Date */
+    .m { color: #DFBFFF } /* Literal.Number */
+    .s { color: #D5FF80 } /* Literal.String */
+    .na { color: #FFD173 } /* Name.Attribute */
+    .nb { color: #FFD173 } /* Name.Builtin */
+    .nc { color: #73D0FF } /* Name.Class */
+    .no { color: #FFD173 } /* Name.Constant */
+    .nd { color: #7e8aa1; font-weight: bold; font-style: italic } /* Name.Decorator */
+    .ni { color: #95E6CB } /* Name.Entity */
+    .ne { color: #73D0FF } /* Name.Exception */
+    .nf { color: #FFD173 } /* Name.Function */
+    .nl { color: #d4d2c8 } /* Name.Label */
+    .nn { color: #d4d2c8 } /* Name.Namespace */
+    .nx { color: #d4d2c8 } /* Name.Other */
+    .py { color: #FFD173 } /* Name.Property */
+    .nt { color: #5CCFE6 } /* Name.Tag */
+    .nv { color: #d4d2c8 } /* Name.Variable */
+    .ow { color: #FFAD66 } /* Operator.Word */
+    .pm { color: #d4d2c8 } /* Punctuation.Marker */
+    .w { color: #d4d2c8 } /* Text.Whitespace */
+    .mb { color: #DFBFFF } /* Literal.Number.Bin */
+    .mf { color: #DFBFFF } /* Literal.Number.Float */
+    .mh { color: #DFBFFF } /* Literal.Number.Hex */
+    .mi { color: #DFBFFF } /* Literal.Number.Integer */
+    .mo { color: #DFBFFF } /* Literal.Number.Oct */
+    .sa { color: #F29E74 } /* Literal.String.Affix */
+    .sb { color: #D5FF80 } /* Literal.String.Backtick */
+    .sc { color: #D5FF80 } /* Literal.String.Char */
+    .dl { color: #D5FF80 } /* Literal.String.Delimiter */
+    .sd { color: #7e8aa1 } /* Literal.String.Doc */
+    .s2 { color: #D5FF80 } /* Literal.String.Double */
+    .se { color: #95E6CB } /* Literal.String.Escape */
+    .sh { color: #D5FF80 } /* Literal.String.Heredoc */
+    .si { color: #95E6CB } /* Literal.String.Interpol */
+    .sx { color: #95E6CB } /* Literal.String.Other */
+    .sr { color: #95E6CB } /* Literal.String.Regex */
+    .s1 { color: #D5FF80 } /* Literal.String.Single */
+    .ss { color: #DFBFFF } /* Literal.String.Symbol */
+    .bp { color: #5CCFE6 } /* Name.Builtin.Pseudo */
+    .fm { color: #FFD173 } /* Name.Function.Magic */
+    .vc { color: #d4d2c8 } /* Name.Variable.Class */
+    .vg { color: #d4d2c8 } /* Name.Variable.Global */
+    .vi { color: #d4d2c8 } /* Name.Variable.Instance */
+    .vm { color: #d4d2c8 } /* Name.Variable.Magic */
+    .il { color: #DFBFFF } /* Literal.Number.Integer.Long */
+  }
+}
diff --git a/searx/static/themes/simple/src/less/code.less b/searx/static/themes/simple/src/less/code.less
index f4e6735b..d6553feb 100644
--- a/searx/static/themes/simple/src/less/code.less
+++ b/searx/static/themes/simple/src/less/code.less
@@ -1,9 +1,51 @@
-.code-highlight pre {
-  overflow: auto;
-  background-color: inherit;
-  color: inherit;
-  border: inherit;
+@import "../generated/pygments.less";
+
+.codelines {
+  margin: @results-margin 0 0 0;
+  padding: @result-padding 0 0 0;
 }
 
-// stylelint-disable no-invalid-position-at-import-rule
-@import "../generated/pygments.less";
+.code-highlight-sxng() {
+  .code-highlight {
+    pre {
+      overflow: auto;
+      margin: 0;
+      padding: 0 0 0.75rem 0;
+    }
+
+    .linenos {
+      user-select: none;
+      cursor: default;
+
+      &::selection {
+        background: transparent; /* WebKit/Blink Browsers */
+      }
+
+      &::-moz-selection {
+        background: transparent; /* Gecko Browsers */
+      }
+      margin-right: 8px;
+      text-align: right;
+    }
+
+    span.linenos {
+      color: #64708d;
+    }
+  }
+}
+
+.code-highlight-sxng();
+
+/// Dark Theme (autoswitch based on device pref)
+@media (prefers-color-scheme: dark) {
+  :root.theme-auto {
+    .code-highlight-dark();
+    .code-highlight-sxng();
+  }
+}
+
+// Dark Theme by preferences
+:root.theme-dark {
+  .code-highlight-dark();
+  .code-highlight-sxng();
+}
diff --git a/searx/templates/simple/result_templates/code.html b/searx/templates/simple/result_templates/code.html
index 3fe429ca..7d2c8ff7 100644
--- a/searx/templates/simple/result_templates/code.html
+++ b/searx/templates/simple/result_templates/code.html
@@ -2,12 +2,31 @@
 
 {{ result_header(result, favicons, image_proxify) -}}
 {{- result_sub_header(result) -}}
-{%- if result.content %}{{ result.content|safe }}{% endif %}</p>
+
+{%- if result.content -%}
+  <p class="content">
+    {{- result.content|safe -}}
+  </p>
+{%- endif -%}
 {%- if result.repository -%}
-<p class="content"><a href="{{ result.repository|safe }}" {% if results_on_new_tab %}target="_blank" rel="noopener noreferrer"{% else %}rel="noreferrer"{% endif %}>{{ result.repository }}</a></p>
+  <p class="content">{{- '' -}}
+    {{ _('repo') }}: {{- ' ' -}}
+    <a href="{{ result.repository|safe }}"{{- ' ' -}}
+       {% if results_on_new_tab %}
+         target="_blank" {{- ' ' -}}
+         rel="noopener noreferrer"
+       {%- else -%}
+         rel="noreferrer"
+       {%- endif -%}
+       >
+       {{- result.repository -}}
+    </a>{{- '' -}}
+  </p>
 {%- endif -%}
+
 <div dir="ltr" class="codelines">
     {{- result.codelines|code_highlighter(result.code_language)|safe -}}
-</div>{{- '' -}}
+</div>
+
 {{- result_sub_footer(result, proxify) -}}
-{{ result_footer(result) }}
+{{- result_footer(result) -}}
diff --git a/searx/webapp.py b/searx/webapp.py
index 9793ee53..ec4f7627 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -216,7 +216,7 @@ def code_highlighter(codelines, language=None):
         lexer = get_lexer_by_name(language, stripall=True)
 
     except Exception as e:  # pylint: disable=broad-except
-        logger.exception(e, exc_info=True)
+        logger.warning("pygments lexer: %s " % e)
         # if lexer is not found, using default one
         lexer = get_lexer_by_name('text', stripall=True)