1 files changed, 50 insertions, 0 deletions
diff --git a/lib/wrongdoc/history.rb b/lib/wrongdoc/history.rb
new file mode 100644
index 0000000..3443ca3
--- /dev/null
+++ b/lib/wrongdoc/history.rb
@@ -0,0 +1,50 @@
+module Wrongdoc::History
+  def initialize_history
+    @tags = @old_summaries = nil
+  end
+
+  # returns a cgit URI for a given +tag_name+
+  def tag_uri(tag_name)
+    uri = @cgit_uri.dup
+    uri.path = "/tag/"
+    uri.query = "id=#{tag_name}"
+    uri
+  end
+
+  # TODO: investigate Ruby git libraries
+  def tags
+    timefmt = '%Y-%m-%dT%H:%M:%SZ'
+    @tags ||= `git tag -l`.split(/\n/).map do |tag|
+      next if tag == "v0.0.0"
+      if %r{\Av[\d\.]+} =~ tag
+        header, subject, body = `git cat-file tag #{tag}`.split(/\n\n/, 3)
+        header = header.split(/\n/)
+        tagger = header.grep(/\Atagger /).first
+        body ||= "initial"
+        time = Time.at(tagger.split(/ /)[-2].to_i).utc
+        {
+          :time => time.strftime(timefmt),
+          :ruby_time => time,
+          :tagger_name => %r{^tagger ([^<]+)}.match(tagger)[1].strip,
+          :tagger_email => %r{<([^>]+)>}.match(tagger)[1].strip,
+          :id => `git rev-parse refs/tags/#{tag}`.chomp!,
+          :tag => tag,
+          :subject => subject,
+          :body => (old = old_summaries[tag]) ? "#{old}\n#{body}" : body,
+        }
+      end
+    end.compact.sort { |a,b| b[:time] <=> a[:time] }
+  end
+
+  def old_summaries
+    @old_summaries ||= if File.exist?(".CHANGELOG.old")
+      File.readlines(".CHANGELOG.old").inject({}) do |hash, line|
+        version, summary = line.split(/ - /, 2)
+        hash[version] = summary
+        hash
+      end
+    else
+      {}
+    end
+  end
+end