Glob scope path only if configured with a pattern

docs/_docs/configuration.md

@@ -549,7 +549,9 @@ defaults:
 In this example, the `layout` is set to `default` inside the
 [collection](../collections/) with the name `my_collection`.
 
-It is also possible to use glob patterns when matching defaults. For example, it is possible to set specific layout for each `special-page.html` in any subfolder of `section` folder. {%- include docs_version_badge.html version="3.7.0" -%}
+### Glob patterns in Front Matter defaults
+
+It is also possible to use glob patterns (currently limited to patterns that contain `*`) when matching defaults. For example, it is possible to set specific layout for each `special-page.html` in any subfolder of `section` folder. {%- include docs_version_badge.html version="3.7.0" -%}
 
 ```yaml
 collections:
@@ -564,6 +566,17 @@ defaults:
       layout: "specific-layout"
 ```
 
+<div class="note warning">
+  <h5>Globbing and Performance</h5>
+  <p>
+    Please note that globbing a path is a known performance-poison and is
+    currently not optimized, especially on Windows. Globbing a path will
+    increase your build times in proportion to the size of the associated
+    collection directory.
+  </p>
+</div>
+
+
 ### Precedence
 
 Jekyll will apply all of the configuration settings you specify in the `defaults` section of your `_config.yml` file. However, you can choose to override settings from other scope/values pair by specifying a more specific path for the scope.

lib/jekyll/frontmatter_defaults.rb

@@ -97,21 +97,26 @@ def applies?(scope, path, type)
       applies_path?(scope, path) && applies_type?(scope, type)
     end
 
+    # rubocop:disable Metrics/AbcSize
     def applies_path?(scope, path)
       return true if !scope.key?("path") || scope["path"].empty?
 
       sanitized_path = Pathname.new(sanitize_path(path))
-
-      site_path = Pathname.new(@site.source)
+      site_path      = Pathname.new(@site.source)
       rel_scope_path = Pathname.new(scope["path"])
       abs_scope_path = File.join(@site.source, rel_scope_path)
-      Dir.glob(abs_scope_path).each do |scope_path|
-        scope_path = Pathname.new(scope_path).relative_path_from site_path
-        return true if path_is_subpath?(sanitized_path, scope_path)
+
+      if scope["path"].to_s.include?("*")
+        Dir.glob(abs_scope_path).each do |scope_path|
+          scope_path = Pathname.new(scope_path).relative_path_from site_path
+          Jekyll.logger.debug "Globbed Scope Path:", scope_path
+          return true if path_is_subpath?(sanitized_path, scope_path)
+        end
       end
 
       path_is_subpath?(sanitized_path, rel_scope_path)
     end
+    # rubocop:enable Metrics/AbcSize
 
     def path_is_subpath?(path, parent_path)
       path.ascend do |ascended_path|

test/test_front_matter_defaults.rb

@@ -16,7 +16,7 @@ class TestFrontMatterDefaults < JekyllUnitTest
           },
         },],
       })
-      @site.process
+      @output = capture_output { @site.process }
       @affected = @site.pages.find { |page| page.relative_path == "contacts/bar.html" }
       @not_affected = @site.pages.find { |page| page.relative_path == "about.html" }
     end
@@ -25,6 +25,10 @@ class TestFrontMatterDefaults < JekyllUnitTest
       assert_equal @affected.data["key"], "val"
       assert_nil @not_affected.data["key"]
     end
+
+    should "not call Dir.glob block" do
+      refute_includes @output, "Globbed Scope Path:"
+    end
   end
 
   context "A site with full front matter defaults (glob)" do
@@ -40,7 +44,7 @@ class TestFrontMatterDefaults < JekyllUnitTest
           },
         },],
       })
-      @site.process
+      @output = capture_output { @site.process }
       @affected = @site.pages.find { |page| page.relative_path == "contacts/bar.html" }
       @not_affected = @site.pages.find { |page| page.relative_path == "about.html" }
     end
@@ -49,6 +53,10 @@ class TestFrontMatterDefaults < JekyllUnitTest
       assert_equal @affected.data["key"], "val"
       assert_nil @not_affected.data["key"]
     end
+
+    should "call Dir.glob block" do
+      assert_includes @output, "Globbed Scope Path:"
+    end
   end
 
   context "A site with front matter type pages and an extension" do