Class: Prick::Diff

Inherits:
Object
  • Object
show all
Defined in:
lib/prick/diff.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(db1, db2) ⇒ Diff

Returns a new instance of Diff.



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# File 'lib/prick/diff.rb', line 11

def initialize(db1, db2)
  @db1, @db2 = db1, db2
  do_diff
  split_on_table_changes
end

Instance Attribute Details

#after_table_changes ⇒ Object (readonly)

Returns the value of attribute after_table_changes.



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# File 'lib/prick/diff.rb', line 9

def after_table_changes
  @after_table_changes
end

#before_table_changes ⇒ Object (readonly)

Subject of the diff



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# File 'lib/prick/diff.rb', line 7

def before_table_changes
  @before_table_changes
end

#diff ⇒ Object (readonly)

Diff as a list of lines



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# File 'lib/prick/diff.rb', line 4

def diff
  @diff
end

#table_changes ⇒ Object (readonly)

Returns the value of attribute table_changes.



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# File 'lib/prick/diff.rb', line 8

def table_changes
  @table_changes
end

Class Method Details

.same?(db1, db2) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/prick/diff.rb', line 17

def self.same?(db1, db2) Diff.new(db1, db2).same? end

Instance Method Details

#same? ⇒ Boolean

Return true if the two databases are equal. Named #same? to avoid name collision with the built in #equal?

Returns:

  • (Boolean) 


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# File 'lib/prick/diff.rb', line 21

def same?() diff.empty? end

#write_segment(file, segment, mark: true) ⇒ Object 



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# File 'lib/prick/diff.rb', line 36

def write_segment(file, segment, mark: true)
  lines = self.send(segment)
  if lines.empty?
    FileUtils.rm_f(file) if file != "/dev/stdout"
  else
    File.open(file, "w") { |f|
      f.puts "--" + segment.to_s.gsub("_", " ").upcase if mark
      f.puts lines
    }
  end
end

#write_segments(file1, file2 = nil, file3 = nil, mark: true) ⇒ Object

Write the diff between the databases to the given file(s). Return true if the databases are equal



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# File 'lib/prick/diff.rb', line 25

def write_segments(file1, file2 = nil, file3 = nil, mark: true)
  if file2.nil? && file3.nil?
    file2 = file3 = file1
  elsif file2.nil? ^ !file3.nil?
    raise Internal, "Either none or both of `file2` and `file3` should be nil"
  end
  write_segment(file1, :before_table_changes, mark: mark)
  write_segment(file2, :table_changes, mark: mark)
  write_segment(file3, :after_table_changes, mark: mark)
end