# ====================================================
# Classe d'extraction des informations de Git
# Author: Vincent Dubois
# Date: 19 fevrier 2009
# ====================================================
module GitExtractor

  # Methode qui permet de fabriquer le flux HTML a partir des informations
  # presentes dans le referentiel
  def self.extract_changelog scm_current_version, file_name
    git_revisions = Utils.run_command("git log").split(/$/).select{ |l| l =~ /^commit / }.collect { |l| l[8..(l.length-1)] }
    revision = git_revisions[0]
    begin
      git_url = File.read(".git/config").split(/$/).select {|l| l =~ /url = /}[0].split(/url = /)[1]
      puts " Computing changelog for #{git_url}..."
    rescue
      puts " Computing changelog, from commit #{scm_current_version} to revision #{revision}..."
    end
    i = 0
    html = "<table class='bodyTable'><thead><th>Commit</th><th>Date</th><th>Author</th><th>File(s)</th><th>Comment</th></thead><tbody>"
    commits = Utils.run_command("git log --name-status").split(/^commit/)
    commits.delete_at(0)
    commits.each_with_index do |commit, index|
      commit_details = commit.split(/$/)
      puts " Changelog for commit #{commit_details[0].strip}..."
      html = html + "<tr class='#{ index % 2 == 0 ? 'a' : 'b'}'><td><strong>#{commit_details[0].strip}</strong></td>"
      html = html + "<td>#{commit_details[2].strip.split(/Date:   /)[1]}</td><td>#{commit_details[1].strip.split(/Author: /)[1]}</td><td>"
      (6..(commit_details.length - 3)).to_a.each do |file_detail|
        file_status = "added"
        if commit_details[file_detail].strip.at(0) == 'A'
          file_status = "added"
        elsif commit_details[file_detail].strip.at(0) == 'M'
          file_status = "modified"
        elsif commit_details[file_detail].strip.at(0) == 'D'
          file_status = "deleted"
        end
        html = html + "<img src='images/#{file_status}.png' align='absmiddle'/>&#160;#{commit_details[file_detail].strip.split(Regexp.new("\t"))[1]}<br/>"
      end
      html = html + "</td><td>#{commit_details[4].strip}</td></tr>"
    end
    html = html + "</tbody></table>"
    changelog_file = File.open(file_name,"w")
    changelog_file.write(html)
    changelog_file.close
    return revision
  end

end