require 'rubygems/command'
class Gem::Commands::HelpCommand < Gem::Command
# :stopdoc:
EXAMPLES = <<-EOF
Some examples of 'gem' usage.
* Install 'rake', either from local directory or remote server:
gem install rake
* Install 'rake', only from remote server:
gem install rake --remote
* Install 'rake', but only version 0.3.1, even if dependencies
are not met, and into a user-specific directory:
gem install rake --version 0.3.1 --force --user-install
* List local gems whose name begins with 'D':
gem list D
* List local and remote gems whose name contains 'log':
gem search log --both
* List only remote gems whose name contains 'log':
gem search log --remote
* Uninstall 'rake':
gem uninstall rake
* Create a gem:
See http://guides.rubygems.org/make-your-own-gem/
* See information about RubyGems:
gem environment
* Update all gems on your system:
gem update
* Update your local version of RubyGems
gem update --system
EOF
PLATFORMS = <<-'EOF'
RubyGems platforms are composed of three parts, a CPU, an OS, and a
version. These values are taken from values in rbconfig.rb. You can view
your current platform by running `gem environment`.
RubyGems matches platforms as follows:
* The CPU must match exactly unless one of the platforms has
"universal" as the CPU or the local CPU starts with "arm" and the gem's
CPU is exactly "arm" (for gems that support generic ARM architecture).
* The OS must match exactly.
* The versions must match exactly unless one of the versions is nil.
For commands that install, uninstall and list gems, you can override what
RubyGems thinks your platform is with the --platform option. The platform
you pass must match "#{cpu}-#{os}" or "#{cpu}-#{os}-#{version}". On mswin
platforms, the version is the compiler version, not the OS version. (Ruby
compiled with VC6 uses "60" as the compiler version, VC8 uses "80".)
For the ARM architecture, gems with a platform of "arm-linux" should run on a
reasonable set of ARM CPUs and not depend on instructions present on a limited
subset of the architecture. For example, the binary should run on platforms
armv5, armv6hf, armv6l, armv7, etc. If you use the "arm-linux" platform
please test your gem on a variety of ARM hardware before release to ensure it
functions correctly.
Example platforms:
x86-freebsd # Any FreeBSD version on an x86 CPU
universal-darwin-8 # Darwin 8 only gems that run on any CPU
x86-mswin32-80 # Windows gems compiled with VC8
armv7-linux # Gem complied for an ARMv7 CPU running linux
arm-linux # Gem compiled for any ARM CPU running linux
When building platform gems, set the platform in the gem specification to
Gem::Platform::CURRENT. This will correctly mark the gem with your ruby's
platform.
EOF
# :startdoc:
def initialize
super 'help', "Provide help on the 'gem' command"
@command_manager = Gem::CommandManager.instance
end
def arguments # :nodoc:
args = <<-EOF
commands List all 'gem' commands
examples Show examples of 'gem' usage
<command> Show specific help for <command>
EOF
return args.gsub(/^\s+/, '')
end
def usage # :nodoc:
"#{program_name} ARGUMENT"
end
def execute
arg = options[:args][0]
if begins? "commands", arg then
show_commands
elsif begins? "options", arg then
say Gem::Command::HELP
elsif begins? "examples", arg then
say EXAMPLES
elsif begins? "platforms", arg then
say PLATFORMS
elsif options[:help] then
show_help
elsif arg then
show_command_help arg
else
say Gem::Command::HELP
end
end
def show_commands # :nodoc:
out = []
out << "GEM commands are:"
out << nil
margin_width = 4
desc_width = @command_manager.command_names.map { |n| n.size }.max + 4
summary_width = 80 - margin_width - desc_width
wrap_indent = ' ' * (margin_width + desc_width)
format = "#{' ' * margin_width}%-#{desc_width}s%s"
@command_manager.command_names.each do |cmd_name|
command = @command_manager[cmd_name]
summary =
if command then
command.summary
else
"[No command found for #{cmd_name}]"
end
summary = wrap(summary, summary_width).split "\n"
out << sprintf(format, cmd_name, summary.shift)
until summary.empty? do
out << "#{wrap_indent}#{summary.shift}"
end
end
out << nil
out << "For help on a particular command, use 'gem help COMMAND'."
out << nil
out << "Commands may be abbreviated, so long as they are unambiguous."
out << "e.g. 'gem i rake' is short for 'gem install rake'."
say out.join("\n")
end
def show_command_help command_name # :nodoc:
command_name = command_name.downcase
possibilities = @command_manager.find_command_possibilities command_name
if possibilities.size == 1 then
command = @command_manager[possibilities.first]
command.invoke("--help")
elsif possibilities.size > 1 then
alert_warning "Ambiguous command #{command_name} (#{possibilities.join(', ')})"
else
alert_warning "Unknown command #{command_name}. Try: gem help commands"
end
end
def show_help # :nodoc:
command = @command_manager[options[:help]]
if command then
# help with provided command
command.invoke("--help")
else
alert_error "Unknown command #{options[:help]}. Try 'gem help commands'"
end
end
end
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