diff -r d4ec02c51c91 -r af15590802a4 assets/stylesheets/_bootstrap-mincer.scss
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/assets/stylesheets/_bootstrap-mincer.scss	Thu Jun 15 12:17:09 2017 +0200
@@ -0,0 +1,19 @@
+// Mincer asset helper functions
+//
+// This must be imported into a .css.ejs.scss file.
+// Then, <% %>-interpolations will be parsed as strings by Sass, and evaluated by EJS after Sass compilation.
+
+
+@function twbs-font-path($path) {
+  // do something like following
+  // from "path/to/font.ext#suffix" to "<%- asset_path(path/to/font.ext)) + #suffix %>"
+  // from "path/to/font.ext?#suffix" to "<%- asset_path(path/to/font.ext)) + ?#suffix %>"
+  // or from "path/to/font.ext" just "<%- asset_path(path/to/font.ext)) %>"
+  @return "<%- asset_path('#{$path}'.replace(/[#?].*$/, '')) + '#{$path}'.replace(/(^[^#?]*)([#?]?.*$)/, '$2') %>";
+}
+
+@function twbs-image-path($file) {
+  @return "<%- asset_path('#{$file}') %>";
+}
+
+$bootstrap-sass-asset-helper: true;