Class: Brut::CLI::Apps::New::Ops::InsertIntoFile

Inherits:
BaseOp
  • Object
show all
Defined in:
lib/brut/cli/apps/new/ops/insert_into_file.rb

Instance Method Summary collapse

Methods inherited from BaseOp

dry_run=, dry_run?, #dry_run?, fileutils_args, #fileutils_args

Constructor Details

#initialize(file:, content:, before_line:) ⇒ InsertIntoFile

Returns a new instance of InsertIntoFile.



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# File 'lib/brut/cli/apps/new/ops/insert_into_file.rb', line 2

def initialize(file:, content:, before_line:)
  @file        = file
  @content     = content
  @before_line = before_line
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/brut/cli/apps/new/ops/insert_into_file.rb', line 8

def call

  contents = File.read(@file)
  locations = []
  new_contents = []
  contents.split("\n").each_with_index do |line, index|
    if line == @before_line
      new_contents << @content
      locations << (index + 1)
    end
    new_contents << line
  end
  if locations.empty?
    raise "Did not find line '#{@before_line}' exactly in #{@file}"
  end
  if locations.size > 1
    raise "Found exact line '#{@before_line}' #{locations.size} times in #{@file}, should be exactly once so we know where to insert"
  end

  if dry_run?
    puts "Would add to #{@file}, resulting in this content:\n#{new_contents.join("\n")}\n"
    return
  end

  File.open(@file, "w") do |file|
    file.puts new_contents.join("\n")
  end
end