Class: FileDiff

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

Constant Summary collapse

DIFF_REGEX = 
/^@@ -\d+(,\d+)? \+\d+(,\d+)? @@/
FILE_INDEX_REGEX = 
/index [0-9a-f]{7,40}/
BINARY_REGEX = 
/^Binary files \/dev\/null and/
DELETION_REGEX = 
/\[-.*?-\]/
INSERTION_REGEX = 
/\{\+.*?\+\}/
DIFF_STAT_REGEX = 
/^\d+\t\d+\t/
DELETE_REGEX = 
/$\[-.*?-\]$/
DELETE_OP_REGEX = 
/^deleted file/

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(attrs = {}) ⇒ FileDiff

Returns a new instance of FileDiff.



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# File 'lib/file_diff.rb', line 24

def initialize(attrs={})
  attrs.each do |key, val|
    instance_variable_set("@#{key}".to_sym, val)
  end
end

Instance Attribute Details

#a_file_id ⇒ Object

Returns the value of attribute a_file_id.



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# File 'lib/file_diff.rb', line 17

def a_file_id
  @a_file_id
end

#a_file_name ⇒ Object

Returns the value of attribute a_file_name.



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# File 'lib/file_diff.rb', line 15

def a_file_name
  @a_file_name
end

#b_file_id ⇒ Object

Returns the value of attribute b_file_id.



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# File 'lib/file_diff.rb', line 18

def b_file_id
  @b_file_id
end

#b_file_name ⇒ Object

Returns the value of attribute b_file_name.



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# File 'lib/file_diff.rb', line 16

def b_file_name
  @b_file_name
end

#changes_total ⇒ Object

Returns the value of attribute changes_total.



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# File 'lib/file_diff.rb', line 22

def changes_total
  @changes_total
end

#deletions_total ⇒ Object

Returns the value of attribute deletions_total.



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# File 'lib/file_diff.rb', line 21

def deletions_total
  @deletions_total
end

#diffs ⇒ Object

Returns the value of attribute diffs.



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# File 'lib/file_diff.rb', line 19

def diffs
  @diffs
end

#insertions_total ⇒ Object

Returns the value of attribute insertions_total.



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# File 'lib/file_diff.rb', line 20

def insertions_total
  @insertions_total
end

#operation ⇒ Object

Returns the value of attribute operation.



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# File 'lib/file_diff.rb', line 14

def operation
  @operation
end

Class Method Details

.from_git(file_diff_lines) ⇒ Object 



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# File 'lib/file_diff.rb', line 31

def from_git(file_diff_lines)
  FileDiff.new(parse_file_diff(file_diff_lines))
end

.parse_file_diff(file_diff_lines) ⇒ Object

TODO: Handle different file modes like new, move, and delete.



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# File 'lib/file_diff.rb', line 36

def parse_file_diff(file_diff_lines)
  file_names = file_diff_lines
    .first
    .sub("diff --git a/", "")
    .split(" b/")

  a_file_name = file_names.first.strip()
  b_file_name = file_names.last.strip()

  file_index = file_diff_lines
    .each_index
    .detect { |i| file_diff_lines[i].match(FILE_INDEX_REGEX) }

  if file_index.nil?
    a_file_id = nil
    b_file_id = nil
  else
    a_file_id, b_file_id = file_diff_lines[file_index]
      .sub("index ", "")
      .split(" ")
      .first
      .split("..")
  end

  if file_diff_lines.last.match(BINARY_REGEX)
    operation = :binary
  elsif (a_file_name != b_file_name)
    operation = :move
  elsif (file_diff_lines[1].match(DELETE_OP_REGEX))
    operation = :delete
  else
    operation = :change
  end

  diff_index = file_diff_lines
    .each_index
    .detect { |i| file_diff_lines[i].match(DIFF_REGEX) }

  if diff_index.nil?
    diffs = []
  else
    diffs = file_diff_lines[diff_index..-1]
      .reduce([], &fold_reducer(DIFF_REGEX))
      .flat_map { |diff_lines| Diff.from_git(diff_lines) }
  end

  insertions = diffs.map { |diff| diff.insert_count }.reduce(0, :+)
  deletions = diffs.map { |diff| diff.delete_count }.reduce(0, :+)

  {
    operation: operation,
    a_file_name: a_file_name,
    b_file_name: b_file_name,
    a_file_id: a_file_id,
    b_file_id: b_file_id,
    diffs: diffs,
    insertions_total: insertions,
    deletions_total: deletions,
    changes_total: insertions + deletions
  }
end