1 files changed, 84 insertions, 0 deletions
diff --git a/tool/file2lastrev.rb b/tool/file2lastrev.rb
new file mode 100644
index 0000000000..f8f1470574
--- /dev/null
+++ b/tool/file2lastrev.rb
@@ -0,0 +1,84 @@
+#!/usr/bin/env ruby
+
+require 'optparse'
+require 'pathname'
+
+class VCSNotFoundError < RuntimeError; end
+
+def detect_vcs(path)
+  target_path = Pathname(File.expand_path(path))
+
+  path = target_path.directory? ? target_path : target_path.parent  
+  begin
+    return :svn, target_path.relative_path_from(path) if File.directory?("#{path}/.svn")
+    return :git, target_path.relative_path_from(path) if File.directory?("#{path}/.git")
+    path, orig = path.parent, path
+  end until path == orig
+  raise VCSNotFoundError, "does not seem to be under a vcs"
+end
+
+def get_revisions(path)
+  ENV['LANG'] = ENV['LC_ALL'] = ENV['LC_MESSAGES'] = 'C'
+  vcs, path = detect_vcs(path)
+
+  info = case vcs
+  when :svn
+    `svn info #{path}`
+  when :git
+    `git svn info #{path}`
+  end
+
+  if info =~ /^Revision: (\d+)$/
+    last = $1 
+  else
+    raise "last revision not found"
+  end
+  if info =~ /^Last Changed Rev: (\d+)$/
+    changed = $1
+  else
+    raise "changed revision not found"
+  end
+
+  return last, changed
+end
+
+def raise_if_conflict
+  raise "you can specify only one of --changed, --revision.h and --doxygen" if $output
+end
+
+parser = OptionParser.new {|opts|
+  opts.on("--changed", "changed rev") do
+    raise_if_conflict
+    $output = :changed
+  end
+  opts.on("--revision.h") do
+    raise_if_conflict
+    $output = :revision_h
+  end
+  opts.on("--doxygen") do
+    raise_if_conflict
+    $output = :doxygen
+  end
+  opts.on("-q", "--suppress_not_found") do
+    $suppress_not_found = true
+  end
+}
+parser.parse!
+
+
+begin
+  last, changed = get_revisions(ARGV.shift)
+rescue VCSNotFoundError
+  raise unless $suppress_not_found
+end
+
+case $output
+when :changed, nil
+  puts changed
+when :revision_h
+  puts "#define RUBY_REVISION #{changed}"
+when :doxygen
+  puts "r#{changed}/r#{last}"
+else
+  raise "unknown output format `#{$output}'"
+end