変更行を含むRSpecのメソッド開始行を取得する

get_modifying_file_with_method_beginning_linenumber.rb

#!/usr/bin/ruby
# require: diff-lines.sh: https://gist.github.com/KenshoFujisaki/169326eb2fdde5182153

# constants
MAX_FILE_LINES = 1000000

# get args
unless ARGV.length == 2
  puts "usage: #{$0} [before_revision_hash] [after_revision_hash]"
  puts "e.g.:  #{$0} '212dfa0' '0bc3dc7'"
  exit 1
end 
before_rev = ARGV[0]
after_rev = ARGV[1]

# filepath_difflines = {filepath => [diff_linenumber1, diff_linenumber2,..]}
begin
  # set target path/method
  target_path = `pwd`.chomp # + "/spec/"
  target_method_regex = "describe"

  filepath_difflines={}
  `git --no-pager diff #{before_rev}..#{after_rev} --no-ext-diff -U#{MAX_FILE_LINES} #{target_path}/ \
    | diff-lines.sh \
    | grep --color=never -E '^[^\"].*\:[0-9]+\:[\+|\-]'`.
    split("\n").
    map{|e| e.split(":").slice(0..1)}.
    uniq.
    each{|filepath, line| 
      filepath_difflines[filepath] ||= [];
      filepath_difflines[filepath] << line.to_i}
rescue => e
  p e
  exit 1
end 

# checkout after revision
begin
  original_branch=`git branch | awk '/^\*/{print $2}'`.chomp
  `git stash; git checkout -q #{after_rev}; git stash pop`
rescue => e
  p e
  `git stash; git checkout #{original_branch}; git stash pop`
  exit 1
end 

# filepath_with_methodlinenumber := ["filepath:linenumber"]
begin
  filepath_with_methodlinenumber = filepath_difflines.
    map{|filepath, difflines| 
    # def_line = [["def ***", def_linenumber]]
    def_line = `cat #{filepath} | grep --color=never -nE "\ +(#{target_method_regex})\ "`.split("\n").
      map{|elm| [elm.split(" ")[2], elm.split(":")[0].to_i] }
      def_line.push(["eof", MAX_FILE_LINES])

      difflines.map{|diffline| 
        def_line.each_with_index.select{|_def_line, i| 
          diffline >= _def_line[1] && diffline < def_line[i+1][1]
        }.first
      }.uniq.compact.map{|diffline| 
        "#{filepath}:#{diffline[1]}"
      }.first
  }
  # stdout
  # spec/controllers/hoge_controller_spec.rb:27
  # spec/controllers/fuga_controller_spec.rb:67
  puts filepath_with_methodlinenumber
rescue => e
  p e
  `git stash; git checkout #{original_branch}; git stash pop`
  exit 1
end

# checkout original revision
`git stash; git checkout -q #{original_branch}; git stash pop`

以下のように利用することで、修正したRSpecのメソッドについてのみテスト実行します．

spring rspec -fd -c `ruby get_modifying_file_with_method_beginning_linenumber.rb`

これは，例えば，以下のように実行されます．

spring rspec -fd -c spec/controllers/hoge_controller_spec.rb:27 spec/controllers/fuga_controller_spec.rb:67

git diffに対して行数出力にパスが通っている必要があります．