module Mkalias

# File lib/mkalias.rb, line 62
def add_signal(file_path = BASHRC_PATH)
  return false if Mkalias.signal?(file_path)

  trap_command = "trap 'source #{file_path}' #{SIGNAL_NAME}"
  open(file_path, 'a') do |file|
    file.puts("\n")
    file.puts(trap_command)
  end

  true
end

# File lib/mkalias.rb, line 90
def get_alias_command(alias_name, file_path = BASHRC_PATH)
  alias_names = Mkalias.list_alias(file_path)
  return nil unless alias_names.include?(alias_name)

  command_regex = /mkalias_#{alias_name}\(\)[{](.+)[;]/

  file_text = File.open(file_path, &:read)
  commands = file_text.scan(command_regex).flatten.first
  commands = commands.split(';').each(&:strip!) if commands

  commands
end

# File lib/mkalias.rb, line 28
def list_alias(file_path = BASHRC_PATH)
  alias_regex = /mkalias_(.*?)\(/

  file_text = File.open(file_path, &:read)
  alias_names = file_text.scan(alias_regex).flatten

  alias_names
end

# File lib/mkalias.rb, line 11
def new_alias(alias_name, commands, file_path = BASHRC_PATH)
  alias_names = Mkalias.list_alias(file_path)
  return false if alias_names.include?(alias_name)

  commands = Mkalias.prepare_commands(commands)

  function_name = "mkalias_#{alias_name}"
  bash_function = "function #{function_name}(){ #{commands}; }"
  bash_alias = "alias #{alias_name}='#{function_name}'"

  open(file_path, 'a') do |file|
    file.puts("\n#{bash_alias}\n#{bash_function}")
  end

  true
end

# File lib/mkalias.rb, line 114
def prepare_commands(commands)
  commands = commands.join('; ') if commands.is_a?(Array)
  unless commands.include?(';') || commands.include?('#')
    commands = "#{commands} $@"
  end
  commands = commands.tr('#', '$')

  commands
end

# File lib/mkalias.rb, line 50
def remove_alias(alias_names, file_path = BASHRC_PATH)
  alias_names = [alias_names] unless alias_names.is_a?(Array)

  removed_alias = []
  alias_names.each do |alias_name|
    removed = Mkalias.remove_one_alias(alias_name, file_path)
    removed_alias << alias_name if removed
  end

  removed_alias
end

# File lib/mkalias.rb, line 103
def remove_one_alias(alias_name, file_path = BASHRC_PATH)
  alias_names = Mkalias.list_alias(file_path)
  return false unless alias_names.include?(alias_name)

  alias_regex = /\bmkalias_#{alias_name}[(']/

  lines = File.readlines(file_path).reject { |line| line =~ alias_regex }

  File.open(file_path, 'w') { |f| lines.each { |line| f.puts line } }
end

# File lib/mkalias.rb, line 74
def remove_signal(file_path = BASHRC_PATH)
  return false unless signal?(file_path)

  trap_regex = /\btrap\s'source\s(.*)\sUSR1/

  lines = File.readlines(file_path).reject { |line| line =~ trap_regex }
  File.open(file_path, 'w') { |f| lines.each { |line| f.puts line } }

  true
end

# File lib/mkalias.rb, line 37
def show_alias(alias_names, file_path = BASHRC_PATH)
  alias_names = [alias_names] unless alias_names.is_a?(Array)

  alias_commands = {}
  alias_names.each do |alias_name|
    alias_commands[alias_name] = Mkalias.get_alias_command(alias_name,
                                                           file_path)
  end

  alias_commands.select! { |_, value| !value.nil? }
  alias_commands
end

# File lib/mkalias.rb, line 85
def signal?(file_path = BASHRC_PATH)
  trap_regex = /\btrap\s'source\s(.*)\sUSR1/
  !File.foreach(file_path).grep(trap_regex).empty?
end