Fix #4188: Extract title from filename successfully when dateless.

features/collections.feature

@@ -155,5 +155,20 @@ Feature: Collections
     """
     When I run jekyll build
     Then I should get a zero exit status
-    And the _site directory should exist
-    And I should see "Collections: Jekyll.configuration, Jekyll.escape, Jekyll.sanitized_path, Site#generate, , Site#generate," in "_site/index.html"
+    Then the _site directory should exist
+    And I should see "Collections: Jekyll.configuration, Jekyll.escape, Jekyll.sanitized_path, Site#generate, Initialize, Site#generate, YAML with Dots," in "_site/index.html"
+
+  Scenario: Rendered collection with date/dateless filename
+    Given I have an "index.html" page that contains "Collections: {% for method in site.thanksgiving %}{{ method.title }} {% endfor %}"
+    And I have fixture collections
+    And I have a "_config.yml" file with content:
+    """
+    collections:
+      thanksgiving:
+        output: true
+    """
+    When I run jekyll build
+    Then the _site directory should exist
+    And I should see "Thanksgiving Black Friday" in "_site/index.html"
+    And I should see "Happy Thanksgiving" in "_site/thanksgiving/2015-11-26-thanksgiving.html"
+    And I should see "Black Friday" in "_site/thanksgiving/black-friday.html"

lib/jekyll/document.rb

@@ -8,7 +8,7 @@ module Jekyll
     attr_accessor :content, :output
 
     YAML_FRONT_MATTER_REGEXP = /\A(---\s*\n.*?\n?)^((---|\.\.\.)\s*$\n?)/m
-    DATELESS_FILENAME_MATCHER = /^(.*)(\.[^.]+)$/
+    DATELESS_FILENAME_MATCHER = /^(.+\/)*(.*)(\.[^.]+)$/
     DATE_FILENAME_MATCHER = /^(.+\/)*(\d+-\d+-\d+)-(.*)(\.[^.]+)$/
 
     # Create a new Document.
@@ -299,6 +299,9 @@ module Jekyll
         if data['date'].nil? || data['date'].to_i == site.time.to_i
           merge_data!({"date" => date}, source: "filename")
         end
+      elsif DATELESS_FILENAME_MATCHER =~ relative_path
+        m, cats, slug, ext = *relative_path.match(DATELESS_FILENAME_MATCHER)
+        data['title'] ||= slug.split('-').select {|w| w.capitalize! || w }.join(' ')
       end
       populate_categories
       populate_tags

test/source/_thanksgiving/2015-11-26-thanksgiving.md

@@ -0,0 +1,3 @@
+---
+---
+Happy {{ page.title }} !

test/source/_thanksgiving/black-friday.md

@@ -0,0 +1,3 @@
+---
+---
+{{ page.title }}