From 50d0fc3c85feb287551f79a537c2ff81e3ecf5fa Mon Sep 17 00:00:00 2001
From: Alfred Xing <alfredxing@users.noreply.github.com>
Date: Tue, 4 Nov 2014 16:13:04 -0800
Subject: [PATCH 1/3] Match post.name instead of slugs and dates

---
 lib/jekyll/tags/post_url.rb | 26 +++-----------------------
 1 file changed, 3 insertions(+), 23 deletions(-)

diff --git a/lib/jekyll/tags/post_url.rb b/lib/jekyll/tags/post_url.rb
index 0f92df49..39adc51a 100644
--- a/lib/jekyll/tags/post_url.rb
+++ b/lib/jekyll/tags/post_url.rb
@@ -3,35 +3,15 @@ module Jekyll
     class PostComparer
       MATCHER = /^(.+\/)*(\d+-\d+-\d+)-(.*)$/
 
-      attr_accessor :date, :slug
+      attr_accessor :path, :date, :slug
 
       def initialize(name)
-        all, path, date, slug = *name.sub(/^\//, "").match(MATCHER)
+        all, @path, @date, @slug = *name.sub(/^\//, "").match(MATCHER)
         raise ArgumentError.new("'#{name}' does not contain valid date and/or title.") unless all
-        @slug = path ? path + slug : slug
-        @date = Utils.parse_date(date, "'#{name}' does not contain valid date.")
       end
 
       def ==(other)
-        slug == post_slug(other) &&
-          date.year  == other.date.year &&
-          date.month == other.date.month &&
-          date.day   == other.date.day
-      end
-
-      private
-      # Construct the directory-aware post slug for a Jekyll::Post
-      #
-      # other - the Jekyll::Post
-      #
-      # Returns the post slug with the subdirectory (relative to _posts)
-      def post_slug(other)
-        path = other.name.split("/")[0...-1].join("/")
-        if path.nil? || path == ""
-          other.slug
-        else
-          path + '/' + other.slug
-        end
+        other.name.match(/^#{path}#{date}-#{slug}\.[^.]+/)
       end
     end
 

From eaa132c65beae9a3e63ab604b7a3126acb5057a1 Mon Sep 17 00:00:00 2001
From: Alfred Xing <alfredxing@users.noreply.github.com>
Date: Sun, 9 Nov 2014 11:55:47 -0800
Subject: [PATCH 2/3] Fall back to old method with deprecation warning

---
 lib/jekyll/tags/post_url.rb | 39 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/lib/jekyll/tags/post_url.rb b/lib/jekyll/tags/post_url.rb
index 39adc51a..1ffff635 100644
--- a/lib/jekyll/tags/post_url.rb
+++ b/lib/jekyll/tags/post_url.rb
@@ -3,9 +3,10 @@ module Jekyll
     class PostComparer
       MATCHER = /^(.+\/)*(\d+-\d+-\d+)-(.*)$/
 
-      attr_accessor :path, :date, :slug
+      attr_reader :path, :date, :slug, :name
 
       def initialize(name)
+        @name = name
         all, @path, @date, @slug = *name.sub(/^\//, "").match(MATCHER)
         raise ArgumentError.new("'#{name}' does not contain valid date and/or title.") unless all
       end
@@ -13,6 +14,29 @@ module Jekyll
       def ==(other)
         other.name.match(/^#{path}#{date}-#{slug}\.[^.]+/)
       end
+
+      def deprecated_equality(other)
+        date = Utils.parse_date(name, "'#{name}' does not contain valid date and/or title.")
+        slug == post_slug(other) &&
+          date.year  == other.date.year &&
+          date.month == other.date.month &&
+          date.day   == other.date.day
+      end
+
+      private
+      # Construct the directory-aware post slug for a Jekyll::Post
+      #
+      # other - the Jekyll::Post
+      #
+      # Returns the post slug with the subdirectory (relative to _posts)
+      def post_slug(other)
+        path = other.name.split("/")[0...-1].join("/")
+        if path.nil? || path == ""
+          other.slug
+        else
+          path + '/' + other.slug
+        end
+      end
     end
 
     class PostUrl < Liquid::Tag
@@ -39,6 +63,19 @@ eos
           end
         end
 
+        # New matching method did not match, fall back to old method
+        # with deprecation warning if this matches
+
+        site.posts.each do |p|
+          if @post.deprecated_equality p
+            Jekyll::Deprecator.deprecation_message "A call to '{{ post_url #{name} }}' did not match " +
+              "a post using the new matching method of checking name " +
+              "(path-date-slug) equality. Please make sure that you " +
+              "change this tag to match the post's name exactly."
+            return p.url
+          end
+        end
+
         raise ArgumentError.new <<-eos
 Could not find post "#{@orig_post}" in tag 'post_url'.
 

From d4c15efff9fc1138e429652771787066268cd248 Mon Sep 17 00:00:00 2001
From: Alfred Xing <alfredxing@users.noreply.github.com>
Date: Tue, 11 Nov 2014 17:35:09 -0800
Subject: [PATCH 3/3] Cache name matching regex

---
 lib/jekyll/tags/post_url.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/jekyll/tags/post_url.rb b/lib/jekyll/tags/post_url.rb
index 1ffff635..ce97642f 100644
--- a/lib/jekyll/tags/post_url.rb
+++ b/lib/jekyll/tags/post_url.rb
@@ -9,10 +9,12 @@ module Jekyll
         @name = name
         all, @path, @date, @slug = *name.sub(/^\//, "").match(MATCHER)
         raise ArgumentError.new("'#{name}' does not contain valid date and/or title.") unless all
+
+        @name_regex = /^#{path}#{date}-#{slug}\.[^.]+/
       end
 
       def ==(other)
-        other.name.match(/^#{path}#{date}-#{slug}\.[^.]+/)
+        other.name.match(@name_regex)
       end
 
       def deprecated_equality(other)