svn-ignore

#!/usr/bin/env ruby

require 'pp'
require 'tempfile'

HELP=<<__
usage: svn-ignore [+-] [-h|--help] path...
+ (add) is the default.

paths can be specified on the command line, or on stdin

paths specified on stdin can be in the form output by "svn stat":
?  a/path/that/is/unknown
__

add = true

case (arg0 = ARGV.shift)
when "-h", "--help"
  puts HELP
  exit 1

when "+"
  add = true

when "-"
  add = false

when nil

else
  ARGV.unshift arg0

end

args = ARGV

if args.empty? and not $stdin.tty?
  args = $stdin.to_a.map do |path|
    path.chomp!
    # The first 6 or 7 (depending on svn version) columns all have defined possible values...
    #   see "svn help stat"
    if path =~ /^([ ACDIMRX?!~])[ CM] +(.*)/
      if $1 == '?'
	path = $2
      else
	path = nil
      end
    end
    path
  end
end

args.compact!

if args.empty?
  puts HELP
  exit 1
end

#puts "add? #{add.inspect}: #{ARGV.join ', '}"

args.each do |path|
  #puts "#{add ? '+' : '-'} #{path}"

  dir  = File.dirname(path)
  file = File.basename(path)

  props = `svn --non-interactive propget svn:ignore '#{dir}'`

  unless $?.success?
    exit 1
  end

  props = props.split

  props.send(add ? :<< : :delete, file)

  props = props.sort.uniq

  t = Tempfile.new("_svn_ignore_")
  t.write(props.join("\n"))
  t.flush

  system("svn --non-interactive propset --file #{t.path} svn:ignore '#{dir}'")
end