Add jekyll doctor command

bin/jekyll

@@ -86,6 +86,20 @@ command :serve do |c|
 end
 alias_command :server, :serve
 
+command :doctor do |c|
+  c.syntax = 'jekyll doctor'
+  c.description = 'Search site and print specific deprecation warnings'
+
+  c.option '--config CONFIG_FILE[,CONFIG_FILE2,...]', Array, 'Custom configuration file'
+
+  c.action do |args, options|
+    options = normalize_options(options.__hash__)
+    options = Jekyll.configuration(options)
+    Jekyll::Commands::Doctor.process(options)
+  end
+end
+alias_command :hyde, :doctor
+
 command :import do |c|
   c.syntax = 'jekyll import <platform> [options]'
   c.description = 'Import your old blog to Jekyll'

lib/jekyll/page.rb

@@ -114,7 +114,14 @@ module Jekyll
       self.data.deep_merge({
         "url"        => self.url,
         "content"    => self.content,
-        "path"       => self.data['path'] || File.join(@dir, @name).sub(/\A\//, '') })
+        "path"       => self.data['path'] || path })
+    end
+
+    # The path to the source file
+    #
+    # Returns the path to the source file
+    def path
+      File.join(@dir, @name).sub(/\A\//, '')
     end
 
     # Obtain destination path.

lib/jekyll/site.rb

@@ -422,6 +422,7 @@ module Jekyll
 
     def relative_permalinks_deprecation_method
       if config['relative_permalinks'] && !@deprecated_relative_permalinks
+        puts # Places newline after "Generating..."
         Jekyll::Logger.warn "Deprecation:", "Starting in 1.1, permalinks for pages" +
                                             " in subfolders must be absolute" +
                                             " permalinks relative to the site" +