Class: Chef::Knife::Help

Inherits:
Chef::Knife show all
Defined in:
lib/chef/knife/help.rb

Instance Attribute Summary

Attributes inherited from Chef::Knife

#name_args, #ui

Instance Method Summary collapse

Methods inherited from Chef::Knife

#api_key, #apply_computed_config, category, chef_config_dir, common_name, #config_file_settings, config_loader, #configure_chef, #create_object, #delete_object, dependency_loaders, deps, #format_rest_error, guess_category, #humanize_exception, #humanize_http_exception, inherited, #initialize, list_commands, load_commands, load_config, load_deps, #merge_configs, msg, #noauth_rest, #parse_options, reset_config_loader!, reset_subcommands!, #rest, run, #run_with_pretty_exceptions, #server_url, #show_usage, snake_case_name, subcommand_category, subcommand_class_from, subcommand_loader, subcommands, subcommands_by_category, ui, unnamed?, use_separate_defaults?, #username

Methods included from Mixin::ConvertToClassName

#constantize, #convert_to_class_name, #convert_to_snake_case, #filename_to_qualified_string, #snake_case_basename

Methods included from Mixin::PathSanity

#enforce_path_sanity

Constructor Details

This class inherits a constructor from Chef::Knife

Instance Method Details

#find_manpage_path(topic) ⇒ Object 



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# File 'lib/chef/knife/help.rb', line 92

def find_manpage_path(topic)
  if ::File.exists?(::File.expand_path("../distro/common/man/man1/#{topic}.1", CHEF_ROOT))
    # If we've provided the man page in the gem, give that
    return ::File.expand_path("../distro/common/man/man1/#{topic}.1", CHEF_ROOT)
  else
    # Otherwise, we'll just be using MANPATH
    topic
  end
end

#find_manpages_for_query(query) ⇒ Object 



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# File 'lib/chef/knife/help.rb', line 75

def find_manpages_for_query(query)
  possibilities = help_topics.select do |manpage|
    ::File.fnmatch("knife-#{query}*", manpage) || ::File.fnmatch("#{query}*", manpage)
  end
  if possibilities.empty?
    ui.error "No help found for '#{query}'"
    ui.msg ""
    print_help_topics
    exit 1
  elsif possibilities.size == 1
    possibilities.first
  else
    ui.info "Multiple help topics match your query. Pick one:"
    ui.highline.choose(*possibilities)
  end
end

#help_topics ⇒ Object 



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# File 'lib/chef/knife/help.rb', line 62

def help_topics
  # The list of help topics is generated by a rake task from the available man pages
  # This constant is provided in help_topics.rb which is automatically required/loaded by the knife subcommand loader.
  HELP_TOPICS
end

#print_help_topics ⇒ Object 



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# File 'lib/chef/knife/help.rb', line 68

def print_help_topics
  ui.info "Available help topics are: "
  help_topics.collect {|t| t.gsub(/knife-/, '') }.sort.each do |topic|
    ui.msg "  #{topic}"
  end
end

#run ⇒ Object 



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# File 'lib/chef/knife/help.rb', line 25

def run
  if name_args.empty?
    ui.info "Usage: knife SUBCOMMAND (options)"
    ui.msg ""
    # This command is atypical, the user is likely not interested in usage of
    # this command, but knife in general. So hack the banner.
    opt_parser.banner = "General Knife Options:"
    ui.msg opt_parser.to_s
    ui.msg ""
    ui.info "For further help:"
    ui.info("  knife help list             list help topics\n  knife help knife            show general knife help\n  knife help TOPIC            display the manual for TOPIC\n  knife SUBCOMMAND --help     show the options for a command\n")
    exit 1
  else
    @query = name_args.join('-')
  end



  case @query
  when 'topics', 'list'
    print_help_topics
    exit 1
  when 'intro', 'knife'
    @topic = 'knife'
  else
    @topic = find_manpages_for_query(@query)
  end

  manpage_path = find_manpage_path(@topic)
  exec "man #{manpage_path}"
end