Class: MacWifi::CommandLineInterface

Inherits:
Object
  • Object
show all
Defined in:
lib/mac-wifi/command_line_interface.rb

Defined Under Namespace

Classes: BadCommandError, Command

Constant Summary collapse

HELP_TEXT =

Help text to be used when requested by ‘h’ command, in case of unrecognized or nonexistent command, etc.

"
Command Line Switches:                    [mac-wifi version #{MacWifi::VERSION}]

-o[i,j,p,y]               - outputs data in inspect, JSON, puts, or YAML format when not in shell mode
-s                        - run in shell mode
-v                        - verbose mode (prints OS commands and their outputs)

Commands:

a[vail_nets]              - array of names of the available networks
ci                        - connected to Internet (not just wifi on)?
co[nnect] network-name    - turns wifi on, connects to network-name
cy[cle]                   - turns wifi off, then on, preserving network selection
d[isconnect]              - disconnects from current network, does not turn off wifi
h[elp]                    - prints this help
i[nfo]                    - a hash of wifi-related information
l[s_avail_nets]           - details about available networks
n[etwork_name]            - name (SSID) of currently connected network
on                        - turns wifi on
of[f]                     - turns wifi off
pa[ssword] network-name   - password for preferred network-name
pr[ef_nets]               - preferred (not necessarily available) networks
q[uit]                    - exits this program (interactive shell mode only) (see also 'x')
r[m_pref_nets] network-name - removes network-name from the preferred networks list
                          (can provide multiple names separated by spaces)
s[hell]                   - opens an interactive pry shell (command line only)
t[ill]                    - returns when the desired Internet connection state is true. Options:
                          1) 'on'/:on, 'off'/:off, 'conn'/:conn, or 'disc'/:disc
                          2) wait interval, in seconds (optional, defaults to 0.5 seconds)
w[ifion]                  - is the wifi on?
x[it]                     - exits this program (interactive shell mode only) (see also 'q')

When in interactive shell mode:
  * use quotes for string parameters such as method names.
  * for pry commands, use prefix `%`.

"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ CommandLineInterface

Returns a new instance of CommandLineInterface.



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# File 'lib/mac-wifi/command_line_interface.rb', line 59

def initialize(options)
  @options = options
  @model = MacOsModel.new(verbose_mode)
  @interactive_mode = !!(options.interactive_mode)
  run_shell if @interactive_mode
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *options) ⇒ Object

For use by the shell; when typing a command and options, it is passed to process_command_line



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# File 'lib/mac-wifi/command_line_interface.rb', line 158

def method_missing(method_name, *options)
  method_name = method_name.to_s
  method_exists = !! find_command_action(method_name)
  if method_exists
    process_command_line(method_name, options)
  else
    puts(%Q{"#{method_name}" is not a valid command or option. If you intend for this to be a string literal, use quotes or %q/Q{}.})
  end
end

Instance Attribute Details

#interactive_mode ⇒ Object (readonly)

Returns the value of attribute interactive_mode.



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# File 'lib/mac-wifi/command_line_interface.rb', line 7

def interactive_mode
  @interactive_mode
end

#model ⇒ Object (readonly)

Returns the value of attribute model.



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# File 'lib/mac-wifi/command_line_interface.rb', line 7

def model
  @model
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/mac-wifi/command_line_interface.rb', line 7

def options
  @options
end

Instance Method Details

#awesome_print_available? ⇒ Boolean

We’d like to use awesome_print if it is available, but not require it. So, we try to require it, but if that fails, we fall back to using pp (pretty print), which is included in Ruby distributions without the need to install a gem.

Returns:

  • (Boolean) —

    true if awesome_print is available (after requiring it), else false after requiring ‘pp’.



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# File 'lib/mac-wifi/command_line_interface.rb', line 83

def awesome_print_available?
  if @awesome_print_available.nil?  # first time here
    begin
      require 'awesome_print'
      @awesome_print_available = true
    rescue LoadError
      require 'pp'
      @awesome_print_available = false
    end
  end

  @awesome_print_available
end

#call ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 406

def call
  validate_command_line
  begin
    process_command_line(ARGV[0], ARGV[1..-1])
  rescue BadCommandError => error
    separator_line = "! #{'-' * 75} !\n"
    puts '' << separator_line << error.to_s << "\n" << separator_line
    exit(-1)
  end
end

#cmd_a ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 196

def cmd_a
  info = model.available_network_names
  if interactive_mode
    info
  else
    if post_processor
      puts post_processor.(info)
    else
      message = if model.wifi_on?
                  "Available networks are:\n\n#{fancy_string(info)}"
                else
                  "Wifi is off, cannot see available networks."
                end
      puts(message)
    end
  end
end

#cmd_ci ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 215

def cmd_ci
  connected = model.connected_to_internet?
  if interactive_mode
    connected
  else
    puts (post_processor ? post_processor.(connected) : "Connected to Internet: #{connected}")
  end
end

#cmd_co(network, password = nil) ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 225

def cmd_co(network, password = nil)
  model.connect(network, password)
end

#cmd_cy ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 230

def cmd_cy
  model.cycle_network
end

#cmd_d ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 235

def cmd_d
  model.disconnect
end

#cmd_h ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 240

def cmd_h
  print_help
end

#cmd_i ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 245

def cmd_i
  info = model.wifi_info
  if interactive_mode
    info
  else
    if post_processor
      puts post_processor.(info)
    else
      puts fancy_string(info)
    end
  end
end

#cmd_lsa ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 259

def cmd_lsa
  info = model.available_network_info
  if interactive_mode
    info
  else
    if post_processor
      puts post_processor.(info)
    else
      message = model.wifi_on? ? fancy_string(info) : "Wifi is off, cannot see available networks."
      puts(message)
    end
  end
end

#cmd_n ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 274

def cmd_n
  name = model.connected_network_name
  if interactive_mode
    name
  else
    display_name = name ? name : '[none]'
    puts (post_processor ? post_processor.(name) : %Q{Network (SSID) name: "#{display_name}"})
  end
end

#cmd_of ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 285

def cmd_of
  model.wifi_off
end

#cmd_on ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 290

def cmd_on
  model.wifi_on
end

#cmd_pa(network) ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 295

def cmd_pa(network)
  password = model.preferred_network_password(network)

  if interactive_mode
    password
  else
    if post_processor
      puts post_processor.(password)
    else
      output =  %Q{Preferred network "#{model.connected_network_name}" }
      output << (password ? %Q{stored password is "#{password}".} : "has no stored password.")
      puts output
    end
  end
end

#cmd_pr ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 312

def cmd_pr
  networks = model.preferred_networks
  if interactive_mode
    networks
  else
    puts (post_processor ? post_processor.(networks) : fancy_string(networks))
  end
end

#cmd_q ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 322

def cmd_q
  quit
end

#cmd_r(*options) ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 327

def cmd_r(*options)
  removed_networks = model.remove_preferred_networks(*options)
  if interactive_mode
    removed_networks
  else
    puts (post_processor ? post_processor.(removed_networks) : "Removed networks: #{removed_networks.inspect}")
  end
end

#cmd_t(*options) ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 337

def cmd_t(*options)
  target_status = options[0].to_sym
  wait_interval_in_secs = (options[1] ? Float(options[1]) : nil)
  model.till(target_status, wait_interval_in_secs)
end

#cmd_w ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 344

def cmd_w
  on = model.wifi_on?
  if interactive_mode
    on
  else
    puts (post_processor ? post_processor.(on) : "Wifi on: #{on}")
  end
end

#cmd_x ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 354

def cmd_x
  quit
end

#commands ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 359

def commands
  @commands_ ||= [
      Command.new('a',   'avail_nets',    -> (*_options) { cmd_a             }),
      Command.new('ci',  'ci',            -> (*_options) { cmd_ci            }),
      Command.new('co',  'connect',       -> (*options)  { cmd_co(*options)  }),
      Command.new('cy',  'cycle',         -> (*_options) { cmd_cy            }),
      Command.new('d',   'disconnect',    -> (*_options) { cmd_d             }),
      Command.new('h',   'help',          -> (*_options) { cmd_h             }),
      Command.new('i',   'info',          -> (*_options) { cmd_i             }),
      Command.new('l',   'ls_avail_nets', -> (*_options) { cmd_lsa           }),
      Command.new('n',   'network_name',  -> (*_options) { cmd_n             }),
      Command.new('of',  'off',           -> (*_options) { cmd_of            }),
      Command.new('on',  'on',            -> (*_options) { cmd_on            }),
      Command.new('pa',  'password',      -> (*options)  { cmd_pa(*options)  }),
      Command.new('pr',  'pref_nets',     -> (*_options) { cmd_pr            }),
      Command.new('q',   'quit',          -> (*_options) { cmd_q             }),
      Command.new('r',   'rm_pref_nets',  -> (*options)  { cmd_r(*options)   }),
      Command.new('t',   'till',          -> (*options)  { cmd_t(*options)   }),
      Command.new('w',   'wifion',        -> (*_options) { cmd_w             }),
      Command.new('x',   'xit',           -> (*_options) { cmd_x             })
  ]
end

#fancy_puts(object) ⇒ Object Also known as: fp 



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# File 'lib/mac-wifi/command_line_interface.rb', line 103

def fancy_puts(object)
  puts fancy_string(object)
end

#fancy_string(object) ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 98

def fancy_string(object)
  awesome_print_available? ? object.ai : object.pretty_inspect
end

#find_command_action(command_string) ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 383

def find_command_action(command_string)
  result = commands.detect do |cmd|
    cmd.max_string.start_with?(command_string) \
    && \
    command_string.length >= cmd.min_string.length  # e.g. 'c' by itself should not work
  end

  result ? result.action : nil
end

#post_process(object) ⇒ Object

If a post-processor has been configured (e.g. YAML or JSON), use it.



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# File 'lib/mac-wifi/command_line_interface.rb', line 395

def post_process(object)
  post_processor ? post_processor.(object) : object
end

#post_processor ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 401

def post_processor
  options.post_processor
end

#print_help ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 74

def print_help
  puts HELP_TEXT
end

#process_command_line(command, options) ⇒ Object

Processes the command (ARGV) and any relevant options (ARGV).

CAUTION! In interactive mode, any strings entered (e.g. a network name) MUST be in a form that the Ruby interpreter will recognize as a string, i.e. single or double quotes, %q, %Q, etc. Otherwise it will assume it’s a method name and pass it to method_missing!



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# File 'lib/mac-wifi/command_line_interface.rb', line 175

def process_command_line(command, options)
  action = find_command_action(command)
  if action
    action.(*options)
  else
    print_help
    raise BadCommandError.new(
        %Q{Unrecognized command. Command was "#{command}" and options were #{options.inspect}.})
  end
end

#quit ⇒ Object 



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# File 'lib/mac-wifi/command_line_interface.rb', line 187

def quit
  if interactive_mode
    exit(0)
  else
    puts "This command can only be run in shell mode."
  end
end

#run_pry ⇒ Object

Pry will output the content of the method from which it was called. This small method exists solely to reduce the amount of pry’s output that is not needed here.



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# File 'lib/mac-wifi/command_line_interface.rb', line 122

def run_pry
  binding.pry

  # the seemingly useless line below is needed to avoid pry's exiting
  # (see https://github.com/deivid-rodriguez/pry-byebug/issues/45)
  _a = nil
end

#run_shell ⇒ Object

Runs a pry session in the context of this object. Commands and options specified on the command line can also be specified in the shell.



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# File 'lib/mac-wifi/command_line_interface.rb', line 133

def run_shell
  begin
    require 'pry'
  rescue LoadError
    puts "The 'pry' gem and/or one of its prerequisites, required for running the shell, was not found." +
             " Please `gem install pry`."
    exit(-1)
  end

  print_help

  # Enable the line below if you have any problems with pry configuration being loaded
  # that is messing up this runtime use of pry:
  # Pry.config.should_load_rc = false

  # Strangely, this is the only thing I have found that successfully suppresses the
  # code context output, which is not useful here. Anyway, this will differentiate
  # a pry command from a DSL command, which _is_ useful here.
  Pry.config.command_prefix = '%'

  run_pry
end

#validate_command_line ⇒ Object

Asserts that a command has been passed on the command line.



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# File 'lib/mac-wifi/command_line_interface.rb', line 110

def validate_command_line
  if ARGV.empty?
    puts "Syntax is: #{__FILE__} [options] command [command_options]"
    print_help
    exit(-1)
  end
end

#verbose_mode ⇒ Object

Until command line option parsing is added, the only way to specify verbose mode is in the environment variable MAC_WIFI_OPTS.



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# File 'lib/mac-wifi/command_line_interface.rb', line 69

def verbose_mode
  options.verbose
end