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#
# Author:: Daniel DeLeo (<dan@opscode.com>)
# Copyright:: Copyright (c) 2011 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
class Chef
class Knife
class Help < Chef::Knife
banner "knife help [list|TOPIC]"
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(<<-MOAR_HELP)
knife help list list help topics
knife help knife show general knife help
knife help TOPIC display the manual for TOPIC
knife SUBCOMMAND --help show the options for a command
MOAR_HELP
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
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
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
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
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
end
end
end
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