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# = Synopsis
#
# This library allows command-line tools to encapsulate their usage
# as a comment at the top of the main file. Calling <tt>RDoc::usage</tt>
# then displays some or all of that comment, and optionally exits
# the program with an exit status. We always look for the comment
# in the main program file, so it is safe to call this method
# from anywhere in the executing program.
#
# = Usage
#
# RDoc::usage( [ exit_status ], [ section, ...])
# RDoc::usage_no_exit( [ section, ...])
#
# where:
#
# exit_status::
# the integer exit code (default zero). RDoc::usage will exit
# the calling program with this status.
#
# section::
# an optional list of section names. If specified, only the
# sections with the given names as headings will be output.
# For example, this section is named 'Usage', and the next
# section is named 'Examples'. The section names are case
# insensitive.
#
# = Examples
#
# # Comment block describing usage
# # with (optional) section headings
# # . . .
#
# require 'rdoc/usage'
#
# # Display all usage and exit with a status of 0
#
# RDoc::usage
#
# # Display all usage and exit with a status of 99
#
# RDoc::usage(99)
#
# # Display usage in the 'Summary' section only, then
# # exit with a status of 99
#
# RDoc::usage(99, 'Summary')
#
# # Display information in the Author and Copyright
# # sections, then exit 0.
#
# RDoc::usage('Author', 'Copyright')
#
# # Display information in the Author and Copyright
# # sections, but don't exit
#
# RDoc::usage_no_exit('Author', 'Copyright')
#
# = Author
#
# Dave Thomas, The Pragmatic Programmers, LLC
#
# = Copyright
#
# Copyright (c) 2004 Dave Thomas.
# Licensed under the same terms as Ruby
#
require 'rdoc/markup/simple_markup'
require 'rdoc/markup/simple_markup/to_flow'
require 'rdoc/ri/ri_formatter'
require 'rdoc/ri/ri_options'
module RDoc
# Display usage information from the comment at the top of
# the file. String arguments identify specific sections of the
# comment to display. An optional integer first argument
# specifies the exit status (defaults to 0)
def RDoc.usage(*args)
exit_code = 0
if args.size > 0
status = args[0]
if status.respond_to?(:to_int)
exit_code = status.to_int
args.shift
end
end
# display the usage and exit with the given code
usage_no_exit(*args)
exit(exit_code)
end
# Display usage
def RDoc.usage_no_exit(*args)
main_program_file = caller[-1].sub(/:\d+$/, '')
comment = File.open(main_program_file) do |file|
find_comment(file)
end
comment = comment.gsub(/^\s*#/, '')
markup = SM::SimpleMarkup.new
flow_convertor = SM::ToFlow.new
flow = markup.convert(comment, flow_convertor)
format = "plain"
unless args.empty?
flow = extract_sections(flow, args)
end
options = RI::Options.instance
if args = ENV["RI"]
options.parse(args.split)
end
formatter = options.formatter.new(options, "")
formatter.display_flow(flow)
end
######################################################################
private
# Find the first comment in the file (that isn't a shebang line)
# If the file doesn't start with a comment, report the fact
# and return empty string
def RDoc.gets(file)
if (line = file.gets) && (line =~ /^#!/) # shebang
throw :exit, find_comment(file)
else
line
end
end
def RDoc.find_comment(file)
catch(:exit) do
# skip leading blank lines
0 while (line = gets(file)) && (line =~ /^\s*$/)
comment = []
while line && line =~ /^\s*#/
comment << line
line = gets(file)
end
0 while line && (line = gets(file))
return no_comment if comment.empty?
return comment.join
end
end
#####
# Given an array of flow items and an array of section names, extract those
# sections from the flow which have headings corresponding to
# a section name in the list. Return them in the order
# of names in the +sections+ array.
def RDoc.extract_sections(flow, sections)
result = []
sections.each do |name|
name = name.downcase
copy_upto_level = nil
flow.each do |item|
case item
when SM::Flow::H
if copy_upto_level && item.level >= copy_upto_level
copy_upto_level = nil
else
if item.text.downcase == name
result << item
copy_upto_level = item.level
end
end
else
if copy_upto_level
result << item
end
end
end
end
if result.empty?
puts "Note to developer: requested section(s) [#{sections.join(', ')}] " +
"not found"
result = flow
end
result
end
#####
# Report the fact that no doc comment count be found
def RDoc.no_comment
$stderr.puts "No usage information available for this program"
""
end
end
if $0 == __FILE__
RDoc::usage(*ARGV)
end
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