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# frozen_string_literal: true
module IRB
module Command
class ShowDoc < Base
include RubyArgsExtractor
category "Context"
description "Look up documentation with RI."
help_message <<~HELP_MESSAGE
Usage: show_doc [name]
When name is provided, IRB will look up the documentation for the given name.
When no name is provided, a RI session will be started.
Examples:
show_doc
show_doc Array
show_doc Array#each
HELP_MESSAGE
def execute(arg)
# Accept string literal for backward compatibility
name = unwrap_string_literal(arg)
require 'rdoc/ri/driver'
unless ShowDoc.const_defined?(:Ri)
opts = RDoc::RI::Driver.process_args([])
ShowDoc.const_set(:Ri, RDoc::RI::Driver.new(opts))
end
if name.nil?
Ri.interactive
else
begin
Ri.display_name(name)
rescue RDoc::RI::Error
puts $!.message
end
end
nil
rescue LoadError, SystemExit
warn "Can't display document because `rdoc` is not installed."
end
end
end
end
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