git.oblomov.eu Git - rcs-fast-export/blob - rcs-fast-export.rb

   1 #!/usr/bin/ruby
   2
   3 require 'pp'
   4
   5 def usage
   6         STDERR.puts "#{$0} filename -- fast-export filename's RCS history"
   7 end
   8
   9 def not_found(arg)
  10         STDERR.puts "Could not find #{arg}"
  11 end
  12
  13 class Time
  14         def Time.rcs(string)
  15                 fields = string.split('.')
  16                 raise ArgumentError, "wrong number of fields for RCS date #{string}" unless fields.length == 6
  17                 Time.utc(*fields)
  18         end
  19 end
  20
  21 module RCS
  22         # strip an optional final ;
  23         def RCS.clean(arg)
  24                 arg.chomp(';')
  25         end
  26
  27         # strip the first and last @, and de-double @@s
  28         def RCS.sanitize(arg)
  29                 case arg
  30                 when Array
  31                         ret = arg.dup
  32                         raise 'malformed first line' unless ret.first[0,1] == '@'
  33                         raise 'malformed last line' unless ret.last[-1,1] == '@'
  34                         ret.first.sub!(/^@/,'')
  35                         ret.last.sub!(/@$/,'')
  36                         ret.map { |l| l.gsub('@@','@') }
  37                 when String
  38                         arg.chomp('@').sub(/^@/,'').gsub('@@','@')
  39                 else
  40                         raise
  41                 end
  42         end
  43
  44         # clean and sanitize
  45         def RCS.at_clean(arg)
  46                 RCS.sanitize RCS.clean(arg)
  47         end
  48
  49         def RCS.blob(arg)
  50                 arg.gsub('.', '0') + ('90'*5)
  51         end
  52
  53         def RCS.commit(arg)
  54                 arg.gsub('.', '0') + ('09'*5)
  55         end
  56
  57         class File
  58                 attr_accessor :head, :comment, :desc, :revision
  59                 def initialize(fname)
  60                         @fname = fname.dup
  61                         @head = nil
  62                         @comment = nil
  63                         @desc = []
  64                         @revision = Hash.new { |h, r| h[r] = Revision.new(r) }
  65                 end
  66
  67                 def has_revision?(rev)
  68                         @revision.has_key?(rev) and not @revision[rev].author.nil?
  69                 end
  70
  71                 def export_commits
  72                         counter = 0
  73                         exported = []
  74                         until @revision.empty?
  75                                 counter += 1
  76
  77                                 # a string sort is a very good candidate for
  78                                 # export order, getting a miss only for
  79                                 # multi-digit revision components
  80                                 keys = @revision.keys.sort
  81
  82                                 STDERR.puts "commit export loop ##{counter}"
  83                                 STDERR.puts "\t#{exported.length} commits exported so far: #{exported.join(', ')}" unless exported.empty?
  84                                 STDERR.puts "\t#{keys.size} to export: #{keys.join(', ')}"
  85
  86                                 keys.each do |key|
  87                                         rev = @revision[key]
  88                                         # the parent commit is rev.next if we're on the
  89                                         # master branch (rev.branch is nil) or
  90                                         # rev.diff_base otherwise
  91                                         from = rev.branch.nil? ? rev.next : rev.diff_base
  92                                         # A commit can only be exported if it has no
  93                                         # parent, or if the parent has been exported
  94                                         # already. Skip this commit otherwise
  95                                         if from and not exported.include? from
  96                                                 next
  97                                         end
  98
  99                                         branch = rev.branch || 'master'
 100                                         # TODO map authors to author/email
 101                                         author = "#{rev.author} <empty>"
 102                                         date = "#{rev.date.tv_sec} +0000"
 103                                         log = rev.log.to_s
 104
 105                                         puts "commit refs/heads/#{branch}"
 106                                         puts "mark :#{RCS.commit key}"
 107                                         puts "committer #{author} #{date}"
 108                                         puts "data #{log.length}"
 109                                         puts log unless log.empty?
 110                                         puts "from :#{RCS.commit from}" if rev.branch_point
 111                                         puts "M 644 :#{RCS.blob key} #{@fname}"
 112                                         exported.push key
 113                                 end
 114                                 exported.each { |k| @revision.delete(k) }
 115                         end
 116                 end
 117         end
 118
 119         class Revision
 120                 attr_accessor :rev, :author, :date, :state, :next
 121                 attr_accessor :branches, :log, :text
 122                 attr_accessor :branch, :diff_base, :branch_point
 123                 def initialize(rev)
 124                         @rev = rev
 125                         @author = nil
 126                         @date = nil
 127                         @state = nil
 128                         @next = nil
 129                         @branches = []
 130                         @branch = nil
 131                         @branch_point = nil
 132                         @diff_base = nil
 133                         @log = []
 134                         @text = []
 135                 end
 136
 137                 def date=(str)
 138                         @date = Time.rcs(str)
 139                 end
 140
 141                 def blob
 142                         str = @text.join('')
 143                         ret = "blob\nmark :#{RCS.blob @rev}\ndata #{str.length}\n#{str}\n"
 144                         ret
 145                 end
 146         end
 147
 148         def RCS.parse(fname, rcsfile, opts={})
 149                 rcs = RCS::File.new(fname)
 150
 151                 ::File.open(rcsfile, 'r') do |file|
 152                         status = [:basic]
 153                         rev = nil
 154                         lines = []
 155                         difflines = []
 156                         file.each_line do |line|
 157                                 case status.last
 158                                 when :basic
 159                                         command, args = line.split($;,2)
 160                                         next if command.empty?
 161
 162                                         case command
 163                                         when 'head'
 164                                                 rcs.head = RCS.clean(args.chomp)
 165                                         when 'comment'
 166                                                 rcs.comment = RCS.at_clean(args.chomp)
 167                                         when /^[0-9.]+$/
 168                                                 rev = command.dup
 169                                                 if rcs.has_revision?(rev)
 170                                                         status.push :revision_data
 171                                                 else
 172                                                         status.push :new_revision
 173                                                 end
 174                                         when 'desc'
 175                                                 status.push :desc
 176                                                 lines.clear
 177                                                 status.push :read_lines
 178                                         else
 179                                                 STDERR.puts "Skipping unhandled command #{command.inspect}"
 180                                         end
 181                                 when :desc
 182                                         rcs.desc.replace lines.dup
 183                                         status.pop
 184                                 when :read_lines
 185                                         # we sanitize lines as we read them
 186
 187                                         actual_line = line.dup
 188
 189                                         # the first line must begin with a @, which we strip
 190                                         if lines.empty?
 191                                                 ats = line.match(/^@+/)
 192                                                 raise 'malformed line' unless ats
 193                                                 actual_line.replace line.sub(/^@/,'')
 194                                         end
 195
 196                                         # if the line ends with an ODD number of @, it's the
 197                                         # last line -- we work on actual_line so that content
 198                                         # such as @\n or @ work correctly (they would be
 199                                         # encoded respectively as ['@@@\n','@\n'] and
 200                                         # ['@@@@\n']
 201                                         ats = actual_line.chomp.match(/@+$/)
 202                                         if nomore = (ats && Regexp.last_match(0).length.odd?)
 203                                                 actual_line.replace actual_line.chomp.sub(/@$/,'')
 204                                         end
 205                                         lines << actual_line.gsub('@@','@')
 206                                         if nomore
 207                                                 status.pop
 208                                                 redo
 209                                         end
 210                                 when :new_revision
 211                                         case line.chomp
 212                                         when /^date\s+(\S+);\s+author\s+(\S+);\sstate\s(\S+);$/
 213                                                 rcs.revision[rev].date = $1
 214                                                 rcs.revision[rev].author = $2
 215                                                 rcs.revision[rev].state = $3
 216                                         when 'branches'
 217                                                 status.push :branches
 218                                         when 'branches;'
 219                                                 next
 220                                         when /^next\s+(\S+)?;$/
 221                                                 nxt = rcs.revision[rev].next = $1
 222                                                 next unless nxt
 223                                                 raise "multiple diff_bases for #{nxt}" unless rcs.revision[nxt].diff_base.nil?
 224                                                 rcs.revision[nxt].diff_base = rev
 225                                                 rcs.revision[nxt].branch = rcs.revision[rev].branch
 226                                         else
 227                                                 status.pop
 228                                         end
 229                                 when :branches
 230                                         candidate = line.split(';',2)
 231                                         branch = candidate.first.strip
 232                                         rcs.revision[rev].branches.push branch
 233                                         raise "multiple diff_bases for #{branch}" unless rcs.revision[branch].diff_base.nil?
 234                                         rcs.revision[branch].diff_base = rev
 235                                         # we drop the last number from the branch name
 236                                         rcs.revision[branch].branch = branch.sub(/\.\d+$/,'')
 237                                         rcs.revision[branch].branch_point = rev
 238                                         status.pop if candidate.length > 1
 239                                 when :revision_data
 240                                         case line.chomp
 241                                         when 'log'
 242                                                 status.push :log
 243                                                 lines.clear
 244                                                 status.push :read_lines
 245                                         when 'text'
 246                                                 if rev == rcs.head
 247                                                         status.push :head
 248                                                 else
 249                                                         status.push :diff
 250                                                 end
 251                                                 lines.clear
 252                                                 status.push :read_lines
 253                                         else
 254                                                 status.pop
 255                                         end
 256                                 when :log
 257                                         rcs.revision[rev].log.replace lines.dup
 258                                         status.pop
 259                                 when :head
 260                                         rcs.revision[rev].text.replace lines.dup
 261                                         puts rcs.revision[rev].blob
 262                                         status.pop
 263                                 when :diff
 264                                         difflines.replace lines.dup
 265                                         difflines.pop if difflines.last.empty?
 266                                         base = rcs.revision[rev].diff_base
 267                                         unless rcs.revision[base].text
 268                                                 pp rcs
 269                                                 puts rev, base
 270                                                 raise 'no diff base!'
 271                                         end
 272                                         # deep copy
 273                                         buffer = []
 274                                         rcs.revision[base].text.each { |l| buffer << l.dup }
 275
 276                                         adding = false
 277                                         index = -1
 278                                         count = -1
 279
 280                                         while l = difflines.shift
 281                                                 if adding
 282                                                         buffer[index] << l
 283                                                         count -= 1
 284                                                         adding = false unless count > 0
 285                                                         next
 286                                                 end
 287
 288                                                 l.chomp!
 289                                                 raise 'malformed diff' unless l =~ /^([ad])(\d+) (\d+)$/
 290                                                 index = $2.to_i-1
 291                                                 count = $3.to_i
 292                                                 case $1.intern
 293                                                 when :d
 294                                                         # we replace them with empty string so that 'a' commands
 295                                                         # referring to the same line work properly
 296                                                         while count > 0
 297                                                                 buffer[index].replace ''
 298                                                                 index += 1
 299                                                                 count -= 1
 300                                                         end
 301                                                 when :a
 302                                                         adding = true
 303                                                 end
 304                                         end
 305
 306                                         # remove empty lines
 307                                         buffer.delete_if { |l| l.empty? }
 308
 309                                         rcs.revision[rev].text = buffer
 310                                         puts rcs.revision[rev].blob
 311                                         status.pop
 312                                 else
 313                                         STDERR.puts "Unknown status #{status.last}"
 314                                         exit 1
 315                                 end
 316                         end
 317                 end
 318                 rcs.export_commits
 319         end
 320 end
 321
 322 arg=ARGV[0]
 323
 324 if arg.nil?
 325         usage
 326         exit 1
 327 end
 328
 329 SFX = ',v'
 330
 331 if arg[-2,2] == SFX
 332         if File.exists? arg
 333                 rcsfile = arg.dup
 334         else
 335                 not_found "RCS file #{arg}"
 336                 exit 1
 337         end
 338         filename = File.basename(arg, SFX)
 339 else
 340         filename = File.basename(arg)
 341         path = File.dirname(arg)
 342         rcsfile = File.join(path, 'RCS', filename) + SFX
 343         unless File.exists? rcsfile
 344                 rcsfile.replace File.join(path, filename) + SFX
 345                 unless File.exists? rcsfile
 346                         not_found "RCS file for #{filename} in #{path}"
 347                 end
 348         end
 349 end
 350
 351 RCS.parse(filename, rcsfile)