Sass: explicitly set $bootstrap-sass-asset-helper

Remove reliance on a hack as a polyfill for `function-exists`.
Remove clutter from the generated variables template.

6 files changed, 15 insertions, 20 deletions

diff --git a/assets/stylesheets/_bootstrap-compass.scss b/assets/stylesheets/_bootstrap-compass.scss
index 82706c4..8fbc3cd 100644
--- a/assets/stylesheets/_bootstrap-compass.scss
+++ b/assets/stylesheets/_bootstrap-compass.scss
@@ -5,3 +5,5 @@
 @function twbs-image-path($path) {
   @return image-url($path, true);
 }
+
+$bootstrap-sass-asset-helper: true;
diff --git a/assets/stylesheets/_bootstrap-mincer.scss b/assets/stylesheets/_bootstrap-mincer.scss
index 3413250..7ec4657 100644
--- a/assets/stylesheets/_bootstrap-mincer.scss
+++ b/assets/stylesheets/_bootstrap-mincer.scss
@@ -15,3 +15,5 @@
 @function twbs-image-path($file) {
   @return "<%- asset_path('#{$file}') %>";
 }
+
+$bootstrap-sass-asset-helper: true;
diff --git a/assets/stylesheets/_bootstrap-sprockets.scss b/assets/stylesheets/_bootstrap-sprockets.scss
index 7d30692..9fffc1e 100644
--- a/assets/stylesheets/_bootstrap-sprockets.scss
+++ b/assets/stylesheets/_bootstrap-sprockets.scss
@@ -5,3 +5,5 @@
 @function twbs-image-path($path) {
   @return image-path($path);
 }
+
+$bootstrap-sass-asset-helper: true;
diff --git a/assets/stylesheets/bootstrap/_variables.scss b/assets/stylesheets/bootstrap/_variables.scss
index 7d190f2..e23cba0 100644
--- a/assets/stylesheets/bootstrap/_variables.scss
+++ b/assets/stylesheets/bootstrap/_variables.scss
@@ -1,8 +1,4 @@
-// When true, asset path helpers are used, otherwise the regular CSS `url()` is used.
-// When there no function is defined, `fn('')` is parsed as string that equals the right hand side
-// NB: in Sass 3.3 there is a native function: function-exists(twbs-font-path)
-$bootstrap-sass-asset-helper: (twbs-font-path("") != unquote('twbs-font-path("")')) !default;
-
+$bootstrap-sass-asset-helper: false !default;
 //
 // Variables
 // --------------------------------------------------
@@ -82,7 +78,8 @@ $headings-color:          inherit !default;
 
 //** Load fonts from this directory.
 
-// [converter] Asset helpers such as Sprockets and Node.js Mincer do not resolve relative paths
+// [converter] If $bootstrap-sass-asset-helper if used, provide path relative to the assets load path.
+// [converter] This is because some asset helpers, such as Sprockets, do not work with file-relative paths.
 $icon-font-path: if($bootstrap-sass-asset-helper, "bootstrap/", "../fonts/bootstrap/") !default;
 
 //** File name for all font files.
diff --git a/tasks/converter/less_conversion.rb b/tasks/converter/less_conversion.rb
index 4b4bf0c..e653575 100644
--- a/tasks/converter/less_conversion.rb
+++ b/tasks/converter/less_conversion.rb
@@ -95,14 +95,10 @@ class Converter
             file = apply_mixin_parent_selector file, '\.(?:visible|hidden)'
           when 'variables.less'
             file = insert_default_vars(file)
-            file = unindent <<-SCSS + "\n" + file, 14
-              // When true, asset path helpers are used, otherwise the regular CSS `url()` is used.
-              // When there no function is defined, `fn('')` is parsed as string that equals the right hand side
-              // NB: in Sass 3.3 there is a native function: function-exists(twbs-font-path)
-              $bootstrap-sass-asset-helper: #{sass_fn_exists('twbs-font-path')} !default;
-            SCSS
+            file = ['$bootstrap-sass-asset-helper: false !default;', file].join("\n")
             file = replace_all file, %r{(\$icon-font-path): \s*"(.*)" (!default);}, "\n" + unindent(<<-SCSS, 14)
-              // [converter] Asset helpers such as Sprockets and Node.js Mincer do not resolve relative paths
+              // [converter] If $bootstrap-sass-asset-helper if used, provide path relative to the assets load path.
+              // [converter] This is because some asset helpers, such as Sprockets, do not work with file-relative paths.
               \\1: if($bootstrap-sass-asset-helper, "bootstrap/", "\\2bootstrap/") \\3;
             SCSS
           when 'close.less'
@@ -146,7 +142,7 @@ class Converter
       # generate variables template
       save_file 'templates/project/_bootstrap-variables.sass',
                 "// Override Bootstrap variables here (defaults from bootstrap-sass v#{Bootstrap::VERSION}):\n\n" +
-                    File.read("#{save_to}/_variables.scss").gsub(/^(?=\$)/, '// ').gsub(/ !default;/, '')
+                    File.read("#{save_to}/_variables.scss").lines[1..-1].join.gsub(/^(?=\$)/, '// ').gsub(/ !default;/, '')
     end
 
     def bootstrap_less_files
diff --git a/templates/project/_bootstrap-variables.sass b/templates/project/_bootstrap-variables.sass
index 968ceb6..080b1a3 100644
--- a/templates/project/_bootstrap-variables.sass
+++ b/templates/project/_bootstrap-variables.sass
@@ -1,10 +1,5 @@
 // Override Bootstrap variables here (defaults from bootstrap-sass v3.3.1.0):
 
-// When true, asset path helpers are used, otherwise the regular CSS `url()` is used.
-// When there no function is defined, `fn('')` is parsed as string that equals the right hand side
-// NB: in Sass 3.3 there is a native function: function-exists(twbs-font-path)
-// $bootstrap-sass-asset-helper: (twbs-font-path("") != unquote('twbs-font-path("")'))
-
 //
 // Variables
 // --------------------------------------------------
@@ -84,7 +79,8 @@
 
 //** Load fonts from this directory.
 
-// [converter] Asset helpers such as Sprockets and Node.js Mincer do not resolve relative paths
+// [converter] If $bootstrap-sass-asset-helper if used, provide path relative to the assets load path.
+// [converter] This is because some asset helpers, such as Sprockets, do not work with file-relative paths.
 // $icon-font-path: if($bootstrap-sass-asset-helper, "bootstrap/", "../fonts/bootstrap/")
 
 //** File name for all font files.