gitlog2gnucl

#!/usr/bin/ruby

#To use this script, do: ./gitlog2gnucl > ChangeLog.generated
#ChangeLog.generated will be your generated ChangeLog file.

#Author: Dodji Seketeli

#This program is free software; you can redistribute
#it and/or modify it under the terms of
#the GNU General Public License as published by the
#Free Software Foundation; either version 2,
#or (at your option) any later version.

#This program 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 General Public License for more details.

#You should have received a copy of the
#GNU General Public License along with Nemiver;
#see the file COPYING.
#If not, write to the Free Software Foundation,
#Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.


class Entry
  attr_accessor :date, :author, :summary, :body

  def initialize(date, author, summary, body)
    @date = filter_date(date)
    @author = author
    @summary = summary
    @body = body

  end

  def filter_date(date)
    if date =~ /(\d\d\d\d-\d\d-\d\d) (\d\d:\d\d:\d\d) (\+\d\d\d\d)/
      return $1
    end
    return date
  end

  # Filters lines of body and summary
  # Basically, don't keep lines with dates formated like:
  # Lundi 2 Juillet 2007, Foo bar <foo@bar.org>
  def keep_line(line)
    if line =~ /svn path=(.*)?; revision=.*/
      return false
    end

    #Filter out lines containing some date formated like: mardi 2 Mars 2006
    if line =~ /\w+\s\d{1,2} .+? \d\d\d\d,/
      return false
    end
    #Filter out lines containing data like
    if line =~ /^\d\d\d\d-\d\d-\d\d [\w\s]+/
      return false
    end
    return true
  end

  def to_s
    s = "#{@date}  #{@author}\n\n"
    if !summary.empty?
      if  keep_line(summary)
        s += "\t#{@summary}\n"
      end
    end
    @body.each {|line|
      if keep_line(line)
	s += "\t#{line}\n"
      end
    }
    return s
  end
end

def process_git_log (log)

  author = ""
  date = ""
  summary = ""
  body = Array.new
  msg_line_num = 0

  entries = Array.new

  log.each_line {|line|
    if line =~ /^--START-ENTRY--/ #This is the start of an entry
      author = ""
      date = ""
      summary = ""
      body = Array.new
      msg_line_num = 0
      next
    elsif line =~ /^--END-ENTRY--/
      if !author.empty? and !date.empty?
	entries.push(Entry.new(date, author, summary, body))
      end
      next
    else #We are in the middle of an entry
      if line =~ /^Author:(.*)?$/
	author = $1
        author = author.strip
      elsif line =~ /^Date:(.*)?$/
	date = $1
        date = date.strip
	msg_line_num = 0
      elsif line =~ /^.+?$/
	msg_line_num += 1
	line = line.strip
	if line.length == 0
	  next
	end
	if msg_line_num == 1 and line[0] != '*'
	  summary = line;
	else
	  body.push(line)
	end
      end
    end
  }
  return entries
end

gitlog = `git log --pretty=format:"--START-ENTRY--%ncommit %H%nAuthor:%an <%ae>%nDate:%ai%n%s%n%b%n--END-ENTRY--"`
entries = process_git_log(gitlog);
entries.each {|entry| print(entry.to_s,"\n") }