Class: Bosh::Cli::Runner

Inherits:
Object show all
Defined in:
lib/cli/runner.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args, options = {}) ⇒ Runner

Returns a new instance of Runner.

Parameters:

  • args (Array) 


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# File 'lib/cli/runner.rb', line 22

def initialize(args, options = {})
  @args = args
  @options = options.dup

  banner = "Usage: bosh [<options>] <command> [<args>]"
  @option_parser = OptionParser.new(banner)

  Config.colorize = true
  Config.output ||= STDOUT
end

Instance Attribute Details

#args ⇒ Array (readonly)

Returns:

  • (Array) 


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# File 'lib/cli/runner.rb', line 11

def args
  @args
end

#options ⇒ Hash (readonly)

Returns:

  • (Hash) 


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# File 'lib/cli/runner.rb', line 14

def options
  @options
end

Class Method Details

.run(args) ⇒ Object

Parameters:

  • args (Array) 


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# File 'lib/cli/runner.rb', line 17

def self.run(args)
  new(args).run
end

Instance Method Details

#add_shortcuts ⇒ Object 



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# File 'lib/cli/runner.rb', line 197

def add_shortcuts
  {
    "st" => "status",
    "props" => "properties",
    "cck" => "cloudcheck"
  }.each do |short, long|
    @parse_tree[short] = @parse_tree[long]
  end
end

#build_parse_tree ⇒ Object 



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# File 'lib/cli/runner.rb', line 182

def build_parse_tree
  @parse_tree = ParseTreeNode.new

  Config.commands.each_value do |command|
    p = @parse_tree
    n_kw = command.keywords.size

    command.keywords.each_with_index do |kw, i|
      p[kw] ||= ParseTreeNode.new
      p = p[kw]
      p.command = command if i == n_kw - 1
    end
  end
end

#find_completions(words, node = @parse_tree, index = 0) ⇒ Object

Finds command completions in the parse tree

Parameters:

  • words (Array) —

    Completion prefix

  • node (Bosh::Cli::ParseTreeNode) (defaults to: @parse_tree) —

    Current parse tree node



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# File 'lib/cli/runner.rb', line 83

def find_completions(words, node = @parse_tree, index = 0)
  word = words[index]

  # exact match and not on the last word
  if node[word] && words.length != index
    find_completions(words, node[word], index + 1)

    # exact match at the last word
  elsif node[word]
    node[word].values

    # find all partial matches
  else
    node.keys.grep(/^#{word}/)
  end
end

#load_plugins ⇒ void

This method returns an undefined value.

Discover and load CLI plugins from all available gems



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# File 'lib/cli/runner.rb', line 150

def load_plugins
  plugins_glob = "bosh/cli/commands/*.rb"

  unless Gem::Specification.respond_to?(:latest_specs) &&
         Gem::Specification.instance_methods.include?(:matches_for_glob)
    say("Cannot load plugins, ".yellow +
        "please run `gem update --system' to ".yellow +
        "update your RubyGems".yellow)
    return
  end

  plugins = Gem::Specification.latest_specs(true).map { |spec|
    spec.matches_for_glob(plugins_glob)
  }.flatten

  plugins.each do |plugin|
    n_commands = Config.commands.size
    gem_dir = Pathname.new(Gem.dir)
    plugin_name = Pathname.new(plugin).relative_path_from(gem_dir)
    begin
      require plugin
    rescue Exception => e
      say("Failed to load plugin #{plugin_name}: #{e.message}".red)
    end
    if Config.commands.size == n_commands
      say(("File #{plugin_name} has been loaded as plugin but it didn't " +
          "contain any commands.\nMake sure this plugin is updated to be " +
          "compatible with BOSH CLI 1.0.").columnize(80).yellow)
    end
  end
end

#parse_global_options ⇒ Object 



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# File 'lib/cli/runner.rb', line 100

def parse_global_options
  # -v is reserved for verbose but having 'bosh -v' is handy,
  # hence the little hack
  if @args.size == 1 && (@args[0] == "-v" || @args[0] == "--version")
    @args = %w(version)
    return
  end

  opts = @option_parser
  opts.on("-c", "--config FILE", "Override configuration file") do |file|
    @options[:config] = file
  end
  opts.on("-C", "--cache-dir DIR", "Override cache directory") do |dir|
    @options[:cache_dir] = dir
  end
  opts.on("--[no-]color", "Toggle colorized output") do |v|
    Config.colorize = v
  end

  opts.on("-v", "--verbose", "Show additional output") do
    @options[:verbose] = true
  end
  opts.on("-q", "--quiet", "Suppress all output") do
    Config.output = nil
  end
  opts.on("-n", "--non-interactive", "Don't ask for user input") do
    @options[:non_interactive] = true
    Config.colorize = false
  end
  opts.on("-N", "--no-track", "Return Task ID and don't track") do
    @options[:no_track] = true
  end
  opts.on("-t", "--target URL", "Override target") do |target|
    @options[:target] = target
  end
  opts.on("-u", "--user USER", "Override username") do |user|
    @options[:username] = user
  end
  opts.on("-p", "--password PASSWORD", "Override password") do |pass|
    @options[:password] = pass
  end
  opts.on("-d", "--deployment FILE", "Override deployment") do |file|
    @options[:deployment] = file
  end

  @args = @option_parser.order!(@args)
end

#run ⇒ void

This method returns an undefined value.

Find and run CLI command



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# File 'lib/cli/runner.rb', line 35

def run
  parse_global_options

  Config.interactive = !@options[:non_interactive]
  Config.cache = Bosh::Cli::Cache.new(@options[:cache_dir])

  load_plugins
  build_parse_tree
  add_shortcuts

  if @args.empty?
    say(usage)
    exit(0)
  end

  command = search_parse_tree(@parse_tree)
  if command.nil? && Config.interactive
    command = try_alias
  end

  if command.nil?
    err("Unknown command: #{@args.join(" ")}")
  end

  command.runner = self
  begin
    exit_code = command.run(@args, @options)
    exit(exit_code)
  rescue OptionParser::ParseError => e
    say(e.message.red)
    say("Usage: bosh #{command.usage_with_params.columnize(60, 7)}")
    if command.has_options?
      say(command.options_summary.indent(7))
    end
  end

rescue OptionParser::ParseError => e
  say(e.message.red)
  say(@option_parser.to_s)
  exit(1)
rescue Bosh::Cli::CliError => e
  say(e.message.red)
  exit(e.exit_code)
end

#search_parse_tree(node) ⇒ Object 



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# File 'lib/cli/runner.rb', line 211

def search_parse_tree(node)
  return nil if node.nil?
  arg = @args.shift

  longer_command = search_parse_tree(node[arg])

  if longer_command.nil?
    @args.unshift(arg) if arg # backtrack if needed
    node.command
  else
    longer_command
  end
end

#try_alias ⇒ Object 



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# File 'lib/cli/runner.rb', line 225

def try_alias
  # Tries to find best match among aliases (possibly multiple words),
  # then unwinds it onto the remaining args and searches parse tree again.
  # Not the most effective algorithm but does the job.
  config = Bosh::Cli::Config.new(@options[:config])
  candidate = []
  best_match = nil
  save_args = @args.dup

  while (arg = @args.shift)
    candidate << arg
    resolved = config.resolve_alias(:cli, candidate.join(" "))
    if best_match && resolved.nil?
      @args.unshift(arg)
      break
    end
    best_match = resolved
  end

  if best_match.nil?
    @args = save_args
    return
  end

  best_match.split(/\s+/).reverse.each do |keyword|
    @args.unshift(keyword)
  end

  search_parse_tree(@parse_tree)
end

#usage ⇒ Object 



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# File 'lib/cli/runner.rb', line 207

def usage
  @option_parser.to_s
end