1#! ./miniruby
2
3def diff2index(cmd, *argv)
4  lines = []
5  path = nil
6  output = `#{cmd} #{argv.join(" ")}`
7  output.force_encoding Encoding::BINARY
8  output.each_line do |line|
9    case line
10    when /^Index: (\S*)/, /^diff --git [a-z]\/(\S*) [a-z]\/\1/
11      path = $1
12    when /^@@\s*-[,\d]+ +\+(\d+)[,\d]*\s*@@(?: +([A-Za-z_][A-Za-z_0-9 ]*[A-Za-z_0-9]))?/
13      line = $1.to_i
14      ent = "\t* #{path}"
15      ent << " (#{$2})" if $2
16      lines << "#{ent}:"
17    end
18  end
19  lines.uniq!
20  lines.empty? ? nil : lines
21end
22
23if `svnversion` =~ /^\d+/
24  cmd = "svn diff --diff-cmd=diff -x-pU0"
25  change = diff2index(cmd, ARGV)
26elsif File.directory?(".git")
27  cmd = "git diff -U0"
28  change = diff2index(cmd, ARGV) || diff2index(cmd, "--cached", ARGV)
29else
30  abort "does not seem to be under a vcs"
31end
32puts change if change
33