simple_svn_log_parser.rb

require "time"

class Commit
  attr_accessor :revision, :author, :time, :lines, :comment
end

# parse input arguments
from = ARGV.shift.to_i
to = ARGV.shift.to_i

# clean svn log
svn_log = open("| svn log").read.lines.to_a

# convert to objects
commits = []
current = nil
for line in svn_log do
  next if line.chomp =~ /^[-]*$/ # cleaning
  if (parts = line.chomp.split(" | ")).size == 4
    # meta
    current = Commit.new
    current.revision = parts[0].gsub("r", "").to_i
    current.author = parts[1]
    current.time = Time.parse(parts[2].split(" (").first)
    current.lines = parts[3].to_i
    current.comment = ""
    commits << current
  else
    # comment
    current.comment << line
  end
end

# find objects
selection = commits.select do |commit|
  (from..to) === commit.revision
end

if $0 == __FILE__
  # print the commit messages
  puts "Changelog for #{selection.size}/#{commits.size} commits (r#{from} to r#{to}): "
  selection.each do |commit|
    puts "[#{commit.revision} - #{commit.author}] #{commit.comment.chomp}"
  end
end