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#!/usr/bin/env ruby
# This script formats the output of the `git diff <old_rev> <new_rev> --raw`
# command so it can be processed by `git cat-file`
# We need to convert this:
# ":100644 100644 5f53439... 85bc2f9... R060\tfiles/js/commit.js.coffee\tfiles/js/commit.coffee"
# To:
# "85bc2f9 R\tfiles/js/commit.js.coffee\tfiles/js/commit.coffee"
ARGF.each do |line|
_, _, old_blob_id, new_blob_id, rest = line.split(/\s/, 5)
old_blob_id.gsub!(/[^\h]/, '')
new_blob_id.gsub!(/[^\h]/, '')
# We can't pass '0000000...' to `git cat-file` given it will not return info about the deleted file
blob_id = new_blob_id =~ /\A0+\z/ ? old_blob_id : new_blob_id
$stdout.puts "#{blob_id} #{rest}"
end
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