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#!/usr/bin/env ruby
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toplevel = %x{git rev-parse --show-toplevel}.strip
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infile = "#{toplevel}/.git/config"
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outfile = infile
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$stderr.puts "Rewriting #{infile}"
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data = File.open(infile, 'rb') {|f| f.read f.stat.size}
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newdata = ""
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data.each_line do |line|
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  newdata << line
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  case line
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  when /^(\s*)fetch\s*=.*remotes\/([^\/]+)\//
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    ws = $1
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    remote = $2
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    pr_line = "fetch = +refs/pull/*/head:refs/remotes/#{remote}/pr/*"
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    next if line.strip == pr_line.strip
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    if data.include? pr_line
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      $stderr.puts "Skipping #{remote}, already present"
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      next
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    else
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      @new_pr_line ||= true
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      $stderr.puts "Adding pull request fetch for #{remote}"
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      newdata << "#{ws}#{pr_line}\n"
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    end
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  end
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end
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if @new_pr_line
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  File.open(outfile, 'wb') {|f| f.write newdata}
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  $stderr.puts "Wrote #{outfile}"
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else
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  $stderr.puts "No changes to #{outfile}"
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end
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