### Home Classes Methods

### In Files

- lib/chef/knife/core/generic_presenter.rb

### Parent

Object

### Methods

- ::new
- #extract_nested_value
- #format
- #format_cookbook_list_for_display
- #format_data_subset_for_display
- #format_for_display
- #format_list_for_display
- #formatting_subset_of_data?
- #interchange?
- #name_or_id_for
- #parse_format_option
- #summarize
- #text_format

### Files

- LICENSE

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No matching classes.

# Chef::Knife::Core::GenericPresenter

    The base presenter class for displaying structured data in knife commands.
    This is not an abstract base class, and it is suitable for displaying
    most kinds of objects that knife needs to display.

### Attributes

config[R]
ui[R]

### Public Class Methods

new(ui, config) click to toggle source

Instaniates a new GenericPresenter. This is generally handled by the Chef::Knife::UI object, though you need to match the signature of this method if you intend to use your own presenter instead.

    # File lib/chef/knife/core/generic_presenter.rb, line 37
    def initialize(ui, config)
      @ui, @config = ui, config
    end

### Public Instance Methods

extract_nested_value(data, nested_value_spec) click to toggle source

    # File lib/chef/knife/core/generic_presenter.rb, line 161
    def extract_nested_value(data, nested_value_spec)
      nested_value_spec.split(".").each do |attr|
        if data.nil?
          nil # don't get no method error on nil
        elsif data.respond_to?(attr.to_sym)
          data = data.send(attr.to_sym)
        elsif data.respond_to?(:[])
          data = data[attr]
        else
          data = begin
            data.send(attr.to_sym)
          rescue NoMethodError
            nil
          end
        end
      end
      ( !data.kind_of?(Array) && data.respond_to?(:to_hash) ) ? data.to_hash : data
    end

format(data) click to toggle source

Returns a String representation of `data` that is suitable for output to a terminal or perhaps for data interchange with another program. The representation of the `data` depends on the value of the `config` setting.

    # File lib/chef/knife/core/generic_presenter.rb, line 58
    def format(data)
      case parse_format_option
      when :summary
        summarize(data)
      when :text
        text_format(data)
      when :json
        Chef::JSONCompat.to_json_pretty(data)
      when :yaml
        require 'yaml'
        YAML::dump(data)
      when :pp
        require 'stringio'
        # If you were looking for some attribute and there is only one match
        # just dump the attribute value
        if config[:attribute] and data.length == 1
          data.values[0]
        else
          out = StringIO.new
          PP.pp(data, out)
          out.string
        end
      end
    end

format_cookbook_list_for_display(item) click to toggle source

    # File lib/chef/knife/core/generic_presenter.rb, line 180
    def format_cookbook_list_for_display(item)
      if config[:with_uri]
        item.inject({}) do |collected, (cookbook, versions)|
          collected[cookbook] = Hash.new
          versions['versions'].each do |ver|
            collected[cookbook][ver['version']] = ver['url']
          end
          collected
        end
      else
        versions_by_cookbook = item.inject({}) do |collected, ( cookbook, versions )|
          collected[cookbook] = versions["versions"].map {|v| v['version']}
          collected
        end
        key_length = versions_by_cookbook.empty? ? 0 : versions_by_cookbook.keys.map {|name| name.size }.max + 2
        versions_by_cookbook.sort.map do |cookbook, versions|
          "#{cookbook.ljust(key_length)} #{versions.join('  ')}"
        end
      end
    end

format_data_subset_for_display(data) click to toggle source

    # File lib/chef/knife/core/generic_presenter.rb, line 135
    def format_data_subset_for_display(data)
      subset = if config[:attribute]
        result = {}
        Array(config[:attribute]).each do |nested_value_spec|
          nested_value = extract_nested_value(data, nested_value_spec)
          result[nested_value_spec] = nested_value
        end
        result
      elsif config[:run_list]
        run_list = data.run_list.run_list
        { "run_list" => run_list }
      else
        raise ArgumentError, "format_data_subset_for_display requires attribute, run_list, or id_only config option to be set"
      end
      {name_or_id_for(data) => subset }
    end

format_for_display(data) click to toggle source

    # File lib/chef/knife/core/generic_presenter.rb, line 123
    def format_for_display(data)
      if formatting_subset_of_data?
        format_data_subset_for_display(data)
      elsif config[:id_only]
        name_or_id_for(data)
      elsif config[:environment] && data.respond_to?(:chef_environment)
        {"chef_environment" => data.chef_environment}
      else
        data
      end
    end

format_list_for_display(list) click to toggle source

    # File lib/chef/knife/core/generic_presenter.rb, line 119
    def format_list_for_display(list)
      config[:with_uri] ? list : list.keys.sort { |a,b| a <=> b }
    end

formatting_subset_of_data?() click to toggle source

    # File lib/chef/knife/core/generic_presenter.rb, line 156
    def formatting_subset_of_data?
      config[:attribute] || config[:run_list]
    end

interchange?() click to toggle source

Is the selected output format a data interchange format? Returns true if the selected output format is json or yaml, false otherwise. Knife search uses this to adjust its data output so as not to produce invalid JSON output.

    # File lib/chef/knife/core/generic_presenter.rb, line 45
    def interchange?
      case parse_format_option
      when :json, :yaml
        true
      else
        false
      end
    end

name_or_id_for(data) click to toggle source

    # File lib/chef/knife/core/generic_presenter.rb, line 152
    def name_or_id_for(data)
      data.respond_to?(:name) ? data.name : data["id"]
    end

parse_format_option() click to toggle source

Converts the user-supplied value of `config` to a Symbol representing the desired output format.

### Returns

returns one of :summary, :text, :json, :yaml, or :pp

### Raises

Raises an ArgumentError if the desired output format could not be determined from the value of `config`

    # File lib/chef/knife/core/generic_presenter.rb, line 90
    def parse_format_option
      case config[:format]
      when "summary", /^s/, nil
        :summary
      when "text", /^t/
        :text
      when "json", /^j/
        :json
      when "yaml", /^y/
        :yaml
      when "pp", /^p/
        :pp
      else
        raise ArgumentError, "Unknown output format #{config[:format]}"
      end
    end

summarize(data) click to toggle source

Summarize the data. Defaults to text format output, which may not be very summary-like

    # File lib/chef/knife/core/generic_presenter.rb, line 109
    def summarize(data)
      text_format(data)
    end

text_format(data) click to toggle source

Converts the `data` to a String in the text format. Uses Chef::Knife::Core::TextFormatter

    # File lib/chef/knife/core/generic_presenter.rb, line 115
    def text_format(data)
      TextFormatter.new(data, ui).formatted_data
    end

[Validate]

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