add suppress author option

see #65

features/citation.feature

@@ -29,6 +29,34 @@ Feature: Citations
     And the "_site/scholar.html" file should exist
     And I should see "Flanagan" in "_site/scholar.html"
 
+  @tags @cite @suppress-author
+  Scenario: Citations With Suppressed Author
+    Given I have a scholar configuration with:
+      | key          | value             |
+      | source       | ./_bibliography   |
+      | bibliography | my_references     |
+    And I have a "_bibliography" directory
+    And I have a file "_bibliography/my_references.bib":
+      """
+      @book{ruby,
+        title     = {The Ruby Programming Language},
+        author    = {Flanagan, David and Matsumoto, Yukihiro},
+        year      = {2008},
+        publisher = {O'Reilly Media}
+      }
+      """
+    And I have a page "scholar.html":
+      """
+      ---
+      ---
+      {% cite ruby --suppress_author %}
+      """
+    When I run jekyll
+    Then the _site directory should exist
+    And the "_site/scholar.html" file should exist
+    And I should see "2008" in "_site/scholar.html"
+    And I should not see "Flanagan" in "_site/scholar.html"
+
   @tags @cite
   Scenario: Missing references
     Given I have a scholar configuration with:

lib/jekyll/scholar/utilities.rb

@@ -38,6 +38,10 @@ module Jekyll
             @cited, @skip_sort = true, true
           end
 
+          opts.on('-A', '--suppress_author') do |cited|
+            @suppress_author = true
+          end
+
           opts.on('-f', '--file FILE') do |file|
             @bibtex_files ||= []
             @bibtex_files << file
@@ -72,7 +76,7 @@ module Jekyll
           end
         end
 
-        argv = arguments.split(/(\B-[cCfqptTslm]|\B--(?:cited(_in_order)?|file|query|prefix|text|style|template|locator|max|))/)
+        argv = arguments.split(/(\B-[cCfqptTslmA]|\B--(?:cited(_in_order)?|file|query|prefix|text|style|template|locator|max|suppress_author|))/)
 
         parser.parse argv.map(&:strip).reject(&:empty?)
       end
@@ -142,6 +146,10 @@ module Jekyll
         sorted
       end
 
+      def suppress_author?
+        !!@suppress_author
+      end
+
       def repository?
         !config['repository'].nil? && !config['repository'].empty?
       end
@@ -338,6 +346,7 @@ module Jekyll
         CiteProc::CitationItem.new id: entry.id do |c|
           c.data = CiteProc::Item.new entry.to_citeproc
           c.data[:'citation-number'] = citation_number
+          c.data.suppress! 'author' if suppress_author?
         end
       end