Method: Leg::Diff.parse

Defined in:
lib/leg/diff.rb

.parse(git_diff) ⇒ Object

Parse a git diff and return an array of Diff objects, one for each file in the git diff.



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# File 'lib/leg/diff.rb', line 51

def self.parse(git_diff)
  in_diff = false
  old_line_num = nil
  new_line_num = nil
  cur_diff = nil
  diffs = []

  git_diff.lines.each do |line|
    if line =~ /^--- (.+)$/
      cur_diff = Leg::Diff.new
      if $1 == '/dev/null'
        cur_diff.is_new_file = true
      end
      diffs << cur_diff
      in_diff = false
    elsif line =~ /^\+\+\+ (.+)$/
      cur_diff.filename = $1.strip.sub(/^b\//, '')
    elsif line =~ /^@@ -(\d+)(,\d+)? \+(\d+)(,\d+)? @@/
      # TODO: somehow preserve function name that comes to the right of the @@ header?
      in_diff = true
      old_line_num = $1.to_i
      new_line_num = $3.to_i
    elsif in_diff && line[0] == '\\'
      # Ignore "\ No newline at end of file".
    elsif in_diff && [' ', '|', '+', '-'].include?(line[0])
      case line[0]
      when ' ', '|'
        line_nums = [old_line_num, new_line_num]
        old_line_num += 1
        new_line_num += 1
        cur_diff << Leg::Line::Unchanged.new(line[1..-1], line_nums)
      when '+'
        line_nums = [nil, new_line_num]
        new_line_num += 1
        cur_diff << Leg::Line::Added.new(line[1..-1], line_nums)
      when '-'
        line_nums = [old_line_num, nil]
        old_line_num += 1
        cur_diff << Leg::Line::Removed.new(line[1..-1], line_nums)
      end
    else
      in_diff = false
    end
  end

  diffs
end