/usr/lib/ruby/1.8/rdoc/usage.rb is in libruby1.8 1.8.7.352-2ubuntu1.6.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 | # = 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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