Class: Commander

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

Overview

An implementation of git like command syntax for ruby applications: see github.com/phR0ze/ruby-nub

Defined Under Namespace

Classes: OptionMatch

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app: nil, version: nil, examples: nil) ⇒ Commander

Initialize the commands for your application

Parameters:

  • app (String) (defaults to: nil) —

    application name e.g. reduce

  • version (String) (defaults to: nil) —

    version of the application e.g. 1.0.0

  • examples (String) (defaults to: nil) —

    optional examples to list after the title before usage



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# File 'lib/nub/commander.rb', line 146

def initialize(app:nil, version:nil, examples:nil)
  @k = OpenStruct.new({
    global: 'global'
  })

  @app = app
  @app_default = Sys.caller_filename
  @version = version
  @examples = examples
  @just = 40

  # Regexps
  @short_regex = /^(-\w).*$/
  @long_regex = /(--[\w\-]+)(=.+)*$/
  @value_regex = /.*=(.*)$/

  # Command line expression results
  # {command_name => {}}
  @cmds = {}

  # Configuration - ordered list of commands
  @config = []

  # Configure default global options
  add_global('-h|--help', 'Print command/options help')
end

Instance Attribute Details

Returns banner string

Returns:

  • (String) —

    the app’s banner



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# File 'lib/nub/commander.rb', line 225

def banner
  @banner
end

#cmds ⇒ Object

Returns the value of attribute cmds.



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# File 'lib/nub/commander.rb', line 140

def cmds
  @cmds
end

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/nub/commander.rb', line 138

def config
  @config
end

Instance Method Details

#[](key) ⇒ Object

Hash like accessor for checking if a command or option is set



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# File 'lib/nub/commander.rb', line 174

def [](key)
  return @cmds[key] if @cmds[key]
end

#add(cmd, desc, nodes: []) ⇒ Object

Add a command to the command list

Parameters:

  • cmd (String) —

    name of the command

  • desc (String) —

    description of the command

  • nodes (List) (defaults to: []) —

    list of command nodes (i.e. options or commands)



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# File 'lib/nub/commander.rb', line 187

def add(cmd, desc, nodes:[])
  Log.die("'#{@k.global}' is a reserved command name") if cmd == @k.global
  Log.die("'#{cmd}' already exists") if @config.any?{|x| x.name == cmd}
  Log.die("'help' is a reserved option name") if nodes.any?{|x| x.class == Option && !x.key.nil? && x.key.include?('help')}
  Log.die("command names must be pure lowercase letters or hypen") if cmd =~ /[^a-z-]/

  # Validate sub command key words
  validate_subcmd = ->(subcmd){
    subcmd.nodes = [] if !subcmd.nodes
    Log.die("'#{@k.global}' is a reserved command name") if subcmd.name == @k.global
    Log.die("'help' is a reserved option name") if subcmd.nodes.any?{|x| x.class == Option && !x.key.nil? && x.key.include?('help')}
    Log.die("command names must be pure lowercase letters or hypen") if subcmd.name =~ /[^a-z-]/
    subcmd.nodes.select{|x| x.class != Option}.each{|x| validate_subcmd.(x)}
  }
  nodes.select{|x| x.class != Option}.each{|x| validate_subcmd.(x)}

  @config << add_cmd(cmd, desc, nodes)
end

#add_global(key, desc, type: nil, required: false, allowed: {}) ⇒ Object

Add global options (any option coming before all commands)

Parameters:

  • key (String) —

    option short hand, long hand and hint e.g. -s|–skip=COMPONENTS

  • desc (String) —

    the option’s description

  • type (Type) (defaults to: nil) —

    the option’s type

  • required (Bool) (defaults to: false) —

    require the option if true else optional

  • allowed (Hash) (defaults to: {}) —

    hash of allowed values to description map



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# File 'lib/nub/commander.rb', line 212

def add_global(key, desc, type:nil, required:false, allowed:{})
  options = [Option.new(key, desc, type:type, required:required, allowed:allowed)]

  # Aggregate global options
  if (global = @config.find{|x| x.name == @k.global})
    global.nodes.each{|x| options << x}
    @config.reject!{|x| x.name == @k.global}
  end
  @config << add_cmd(@k.global, 'Global options:', options)
end

#help ⇒ String

Return the app’s help string

Returns:

  • (String) —

    the app’s help string



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# File 'lib/nub/commander.rb', line 233

def help

  # Global help
  help = @app.nil? ? "" : "#{banner}\n"
  if !@examples.nil? && !@examples.empty?
    newline = @examples.strip_color[-1] != "\n" ? "\n" : ""
    help += "Examples:\n#{@examples}\n#{newline}"
  end
  app = @app || @app_default
  help += "Usage: ./#{app} [commands] [options]\n"
  help += @config.find{|x| x.name == @k.global}.help
  help += "COMMANDS:\n"
  @config.select{|x| x.name != @k.global}.each{|x| help += "    #{x.name.ljust(@just)}#{x.desc}\n" }
  help += "\nsee './#{app} COMMAND --help' for specific command help\n"

  return help
end

#key?(key) ⇒ Boolean

Test if the key exists

Returns:

  • (Boolean) 


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# File 'lib/nub/commander.rb', line 179

def key?(key)
  return @cmds.key?(key)
end

#parse! ⇒ Object

Construct the command line parser and parse



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# File 'lib/nub/commander.rb', line 252

def parse!

  # Clear out the previous run every time, in case run more than once
  @cmds = {}

  # Set help if nothing was given
  ARGV.clear and ARGV << '-h' if ARGV.empty?

  # Parse commands recursively
  move_globals_to_front!
  expand_chained_options!
  while (cmd = @config.find{|x| x.name == ARGV.first})
    ARGV.shift && parse_commands(cmd, nil, @config.select{|x| x.name != cmd.name}, ARGV, @cmds)
  end

  # Ensure specials (global) are always set
  @cmds[:global] = {} if !@cmds[:global]

  # Ensure all options were consumed
  Log.die("invalid options #{ARGV}") if ARGV.any?

  # Print banner on success
  puts(banner) if @app
end