own log class for history

1 files changed, 112 insertions, 0 deletions

diff --git a/log.rb b/log.rb
new file mode 100644
index 0000000..2d62090
--- /dev/null
+++ b/log.rb
@@ -0,0 +1,112 @@
+############################################################################
+# Copyright 2009 Benjamin Kellermann                                       #
+#                                                                          #
+# This file is part of dudle.                                              #
+#                                                                          #
+# Dudle is free software: you can redistribute it and/or modify it under   #
+# the terms of the GNU Affero General Public License as published by       #
+# the Free Software Foundation, either version 3 of the License, or        #
+# (at your option) any later version.                                      #
+#                                                                          #
+# Dudle is distributed in the hope that it will be useful, but WITHOUT ANY #
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or        #
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public     #
+# License for more details.                                                #
+#                                                                          #
+# You should have received a copy of the GNU Affero General Public License #
+# along with dudle.  If not, see <http://www.gnu.org/licenses/>.           #
+############################################################################
+
+require "time"
+
+class LogEntry
+	attr_accessor :rev, :timestamp, :comment
+	def initialize(rev,timestamp,comment)
+		@rev = rev
+		@timestamp = timestamp
+		@comment = comment
+	end
+	def to_html(link = true)
+		ret = "<tr><td>"
+		ret += "<a href='?revision=#{@rev}' >" if link
+		ret += "#{@rev}"
+		ret += "</a>" if link
+		ret += "</td>"
+		ret += "<td>#{@timestamp.strftime('%d.%m, %H:%M')}</td>"
+		ret += "<td>#{CGI.escapeHTML(@comment)}</td>"
+		ret += "</tr>"
+		ret
+	end
+end
+
+class Log
+	def initialize(a = [])
+		@log = a
+	end
+	def min
+		ret = @log[0]
+		@log.each{|l|
+			ret.rev = l if l.rev < ret.rev
+		}
+		ret
+	end
+	def max
+		ret = @log[-1]
+		@log.each{|l|
+			ret.rev = l if l.rev > ret.rev
+		}
+		ret
+	end
+	def [](revision)
+		if revision.class == Fixnum
+			@log.each{|l|
+				return l if l.rev == revision
+			}
+			raise "No such revision found #{revision}"
+		else
+			min_r, max_r = "",""
+			@log.each_with_index{|l,i|
+				min_r = i if l.rev == revision.min
+				max_r = i if l.rev == revision.max
+			}
+			min_r = @log.index(min) if min_r == ""
+			max_r = @log.index(max) if max_r == ""
+			return Log.new(@log[min_r..max_r])
+		end
+	end
+	def add(revision,timestamp,comment)
+		@log << LogEntry.new(revision,timestamp,comment)
+		@log.sort!{|a,b| a.rev <=> b.rev}
+	end
+	def to_html(maxrev, middlerevision)
+		ret = "<table><tr><th>Version</th><th>Date</th><th>Comment</th></tr>"
+		self[((middlerevision-5)..(middlerevision+5))].each do |l|
+			ret += l.to_html(middlerevision != l.rev)
+		end
+		ret += "</table>"
+		ret
+	end
+	def each
+		@log.each{|e| yield(e)}
+	end
+end
+
+if __FILE__ == $0
+require "test/unit"
+  class Log_test < Test::Unit::TestCase
+    def test_indexes
+
+			l = Log.new
+			l.add(10,Time.now,"foo 10")
+			20.times{|i|
+				l.add(i,Time.now,"foo #{i}") unless i == 10
+			}
+
+			assert_equal(0,l.min.rev)
+			assert_equal(19,l.max.rev)
+      assert_equal("foo 10",l[10].comment)
+      l = l[9..11]
+      assert_equal([9,10,11],[l[9].rev,l[10].rev,l[11].rev])
+    end
+  end 
+end