[mod] oscar: fix the sourcemap URL in *.min.css

Close https://github.com/searx/searx/issues/2670

Note: clean-css contains a bug:
* a multiline comment or URL adds "$stdin" to the sourcemap (see src/less/logicodev/search.less)
* in this case when the user opens the devtools, the browser fails to load this "https://.../$stdin" URL
* it is not a problem and the error appears only when the user actively tries to debug the CSS.
* seems related to https://github.com/jakubpawlowicz/clean-css/issues/593

searx/static/themes/oscar/css/logicodev-dark.css

@@ -435,14 +435,7 @@ input[type=checkbox]:not(:checked) + .label_hide_if_checked + .label_hide_if_not
   background-color: white;
   border: #888 1px solid;
   color: #666;
-  background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAPCAQAAACR313BAAAABGdBTUEAALGPC/xhBQAAACBjSFJN
-AAB6JgAAgIQAAPoAAACA6AAAdTAAAOpgAAA6mAAAF3CculE8AAAAAmJLR0QA/4ePzL8AAAAJcEhZ
-cwAABFkAAARZAVnbJUkAAAAHdElNRQfgBxgLDwB20OFsAAAAbElEQVQY073OsQ3CMAAEwJMYwJGn
-sAehpoXJItltBkmcdZBYgIIiQoLglnz3ui+eP+bk5uneteTMZJa6OJuIqvYzSJoqwqBq8gdmTTW8
-6/dghxAUq4xsVYT9laBYXCw93Aajh7GPEF23t4fkBYevGFTANkPRAAAAJXRFWHRkYXRlOmNyZWF0
-ZQAyMDE2LTA3LTI0VDExOjU1OjU4KzAyOjAwRFqFOQAAACV0RVh0ZGF0ZTptb2RpZnkAMjAxNi0w
-Ny0yNFQxMToxNTowMCswMjowMP7RDgQAAAAZdEVYdFNvZnR3YXJlAHd3dy5pbmtzY2FwZS5vcmeb
-7jwaAAAAAElFTkSuQmCC) 96% no-repeat;
+  background: url(data:image/png;base64,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) 96% no-repeat;
 }
 .custom-select-rtl {
   background-position-x: 4%;
@@ -455,11 +448,8 @@ Ny0yNFQxMToxNTowMCswMjowMP7RDgQAAAAZdEVYdFNvZnR3YXJlAHd3dy5pbmtzY2FwZS5vcmeb
   height: 1px;
   width: 1px;
   overflow: hidden;
-  clip: rect(1px 1px 1px 1px);
-  /* IE6, IE7 */
   clip: rect(1px, 1px, 1px, 1px);
   white-space: nowrap;
-  /* added line */
 }
 .label-danger,
 .btn-danger {

searx/static/themes/oscar/css/logicodev.css

@@ -408,14 +408,7 @@ input[type=checkbox]:not(:checked) + .label_hide_if_checked + .label_hide_if_not
   background-color: white;
   border: #888 1px solid;
   color: #666;
-  background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAPCAQAAACR313BAAAABGdBTUEAALGPC/xhBQAAACBjSFJN
-AAB6JgAAgIQAAPoAAACA6AAAdTAAAOpgAAA6mAAAF3CculE8AAAAAmJLR0QA/4ePzL8AAAAJcEhZ
-cwAABFkAAARZAVnbJUkAAAAHdElNRQfgBxgLDwB20OFsAAAAbElEQVQY073OsQ3CMAAEwJMYwJGn
-sAehpoXJItltBkmcdZBYgIIiQoLglnz3ui+eP+bk5uneteTMZJa6OJuIqvYzSJoqwqBq8gdmTTW8
-6/dghxAUq4xsVYT9laBYXCw93Aajh7GPEF23t4fkBYevGFTANkPRAAAAJXRFWHRkYXRlOmNyZWF0
-ZQAyMDE2LTA3LTI0VDExOjU1OjU4KzAyOjAwRFqFOQAAACV0RVh0ZGF0ZTptb2RpZnkAMjAxNi0w
-Ny0yNFQxMToxNTowMCswMjowMP7RDgQAAAAZdEVYdFNvZnR3YXJlAHd3dy5pbmtzY2FwZS5vcmeb
-7jwaAAAAAElFTkSuQmCC) 96% no-repeat;
+  background: url(data:image/png;base64,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) 96% no-repeat;
 }
 .custom-select-rtl {
   background-position-x: 4%;
@@ -428,11 +421,8 @@ Ny0yNFQxMToxNTowMCswMjowMP7RDgQAAAAZdEVYdFNvZnR3YXJlAHd3dy5pbmtzY2FwZS5vcmeb
   height: 1px;
   width: 1px;
   overflow: hidden;
-  clip: rect(1px 1px 1px 1px);
-  /* IE6, IE7 */
   clip: rect(1px, 1px, 1px, 1px);
   white-space: nowrap;
-  /* added line */
 }
 .label-danger,
 .btn-danger {

searx/static/themes/oscar/gruntfile.js

@@ -1,3 +1,4 @@
+/*jshint esversion: 6 */
 module.exports = function(grunt) {
 
   grunt.initConfig({
@@ -101,14 +102,17 @@ module.exports = function(grunt) {
       },
       production: {
         options: {
-          paths: ["src/less/pointhi", "src/less/logicodev", "src/less/logicodev-dark", "less/bootstrap"],
+          paths: ["src/less/pointhi", "src/less/logicodev", "src/less/logicodev-dark", "src/less/bootstrap"],
           plugins: [
             new (require('less-plugin-clean-css'))()
           ],
           sourceMap: true,
+          sourceMapURL: (name) => { const s = name.split('/'); return s[s.length - 1] + '.map';},
+          outputSourceFiles: false,
+          sourceMapRootpath: '../'
         },
         files: {
-          "css/bootstrap.min.css": "src/less/bootstrap/bootstrap.less",
+          "css/bootstrap.min.css": "css/bootstrap.css",
           "css/leaflet.min.css": "css/leaflet.css",
           "css/pointhi.min.css": "src/less/pointhi/oscar.less",
           "css/logicodev.min.css": "src/less/logicodev/oscar.less",

searx/static/themes/oscar/src/less/logicodev/search.less

@@ -65,14 +65,8 @@
     background-color: white;
     border: @semidark-gray 1px solid;
     color: @dark-gray;
-    background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAAPCAQAAACR313BAAAABGdBTUEAALGPC/xhBQAAACBjSFJN
-AAB6JgAAgIQAAPoAAACA6AAAdTAAAOpgAAA6mAAAF3CculE8AAAAAmJLR0QA/4ePzL8AAAAJcEhZ
-cwAABFkAAARZAVnbJUkAAAAHdElNRQfgBxgLDwB20OFsAAAAbElEQVQY073OsQ3CMAAEwJMYwJGn
-sAehpoXJItltBkmcdZBYgIIiQoLglnz3ui+eP+bk5uneteTMZJa6OJuIqvYzSJoqwqBq8gdmTTW8
-6/dghxAUq4xsVYT9laBYXCw93Aajh7GPEF23t4fkBYevGFTANkPRAAAAJXRFWHRkYXRlOmNyZWF0
-ZQAyMDE2LTA3LTI0VDExOjU1OjU4KzAyOjAwRFqFOQAAACV0RVh0ZGF0ZTptb2RpZnkAMjAxNi0w
-Ny0yNFQxMToxNTowMCswMjowMP7RDgQAAAAZdEVYdFNvZnR3YXJlAHd3dy5pbmtzY2FwZS5vcmeb
-7jwaAAAAAElFTkSuQmCC) 96% no-repeat;
+    // Warning: multi-line base64 URL adds "$stdin" in the source map: https://github.com/jakubpawlowicz/clean-css/issues/593
+    background: url(data:image/png;base64,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) 96% no-repeat;
 }
 
 .custom-select-rtl {
@@ -88,9 +82,8 @@ Ny0yNFQxMToxNTowMCswMjowMP7RDgQAAAAZdEVYdFNvZnR3YXJlAHd3dy5pbmtzY2FwZS5vcmeb
     height: 1px;
     width: 1px;
     overflow: hidden;
-    clip: rect(1px 1px 1px 1px); /* IE6, IE7 */
     clip: rect(1px, 1px, 1px, 1px);
-    white-space: nowrap; /* added line */
+    white-space: nowrap;
 }
 .label-danger, .btn-danger {
     background: @dark-red;