Class: StringReplacer

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

Constant Summary collapse

NEWLINE = 
"AijQA6tD1wkWqgvLzXD"
START_MARKER = 
'# START StringReplacer %s -- DO NOT MODIFY'
END_MARKER = 
"# END StringReplacer %s -- DO NOT MODIFY#{NEWLINE}"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ StringReplacer

Returns a new instance of StringReplacer.



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# File 'lib/string_replacer.rb', line 9

def initialize(path)
  @path = path
end

Instance Attribute Details

#path ⇒ Object

Returns the value of attribute path.



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# File 'lib/string_replacer.rb', line 8

def path
  @path
end

Instance Method Details

#replace!(string, replacement_id, after_line) ⇒ Object 



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# File 'lib/string_replacer.rb', line 13

def replace!(string, replacement_id, after_line)
  replacement_id = 1 unless replacement_id.to_s.strip.length > 0
  after_line = nil unless after_line.to_s.strip.length > 0
  new_path = "#{path}.new"
  backup_path = "#{path}.bak"
  current_start_marker = START_MARKER % replacement_id.to_s
  current_end_marker = END_MARKER % replacement_id.to_s
  string_with_markers = current_start_marker + NEWLINE + string + NEWLINE + current_end_marker
  text = IO.read(path).gsub("\n", NEWLINE)
  if text.include? current_start_marker
    text.sub! /#{Regexp.escape current_start_marker}.*#{Regexp.escape current_end_marker}/, string_with_markers
  elsif after_line
    text.sub! /(#{Regexp.escape after_line}#{Regexp.escape NEWLINE})/, '\1' + string_with_markers
  else
    text << NEWLINE << string_with_markers
  end
  text.gsub! NEWLINE, "\n"
  File.open(new_path, 'w') { |f| f.write text }
  FileUtils.mv path, backup_path
  FileUtils.mv new_path, path
end