Class: CLI
- Inherits:
-
Object
show all
- Defined in:
- lib/cli.rb,
lib/cli/dsl.rb
Defined Under Namespace
Modules: DSL
Classes: Arguments, Options, ParserError, ParsingError, Switches, Values
Class Method Summary
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Instance Method Summary
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#argument(name, options = {}) ⇒ Object
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#arguments(name, options = {}) ⇒ Object
-
#description(desc) ⇒ Object
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#initialize(&block) ⇒ CLI
constructor
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#option(name, options = {}) ⇒ Object
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#options(name, options = {}) ⇒ Object
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#parse(_argv = ARGV, stdin = STDIN, stderr = STDERR) ⇒ Object
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#parse!(argv = ARGV, stdin = STDIN, stderr = STDERR, stdout = STDOUT) ⇒ Object
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#stdin(name = :data, options = {}) ⇒ Object
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#switch(name, options = {}) ⇒ Object
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#usage(msg = nil) ⇒ Object
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#usage!(msg = nil, io = STDERR) ⇒ Object
-
#version(version) ⇒ Object
Constructor Details
#initialize(&block) ⇒ CLI
Returns a new instance of CLI.
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# File 'lib/cli.rb', line 115
def initialize(&block)
@arguments = Arguments.new
@switches = Switches.new
@options = Options.new
instance_eval(&block) if block_given?
switch :help, :short => :h, :description => 'display this help message'
switch :version, :description => 'display version string' if @version
end
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Class Method Details
.name ⇒ Object
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# File 'lib/cli.rb', line 303
def self.name
File.basename $0
end
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Instance Method Details
#argument(name, options = {}) ⇒ Object
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# File 'lib/cli.rb', line 138
def argument(name, options = {})
argument_dsl = DSL::Argument.new(name, options)
raise ParserError::ArgumentNameSpecifiedTwice.new(argument_dsl.name) if @arguments.has?(argument_dsl)
@arguments << argument_dsl
end
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#arguments(name, options = {}) ⇒ Object
#description(desc) ⇒ Object
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# File 'lib/cli.rb', line 126
def description(desc)
@description = desc
end
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#option(name, options = {}) ⇒ Object
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# File 'lib/cli.rb', line 162
def option(name, options = {})
option_dsl = DSL::Option.new(name, options)
check_switch_collision!(option_dsl)
@options << option_dsl
end
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#options(name, options = {}) ⇒ Object
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# File 'lib/cli.rb', line 168
def options(name, options = {})
option_dsl = DSL::Options.new(name, options)
check_switch_collision!(option_dsl)
@options << option_dsl
end
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#parse(_argv = ARGV, stdin = STDIN, stderr = STDERR) ⇒ Object
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# File 'lib/cli.rb', line 174
def parse(_argv = ARGV, stdin = STDIN, stderr = STDERR)
values = Values.new
argv = _argv.dup
argv.each do |arg|
break if arg == '--'
if arg == '-h' or arg == '--help'
values.help = usage
return values
end
if @version and arg == '--version'
values.version = "#{CLI.name} version \"#{@version}\"\n"
return values
end
end
@options.each do |o|
values.value(o, nil)
end
@switches.each do |o|
values.value(o, nil)
end
@options.multiary.each do |o|
values.value(o, [])
end
mandatory_options = @options.mandatory.dup
while not argv.first == '--' and Switches.is_switch?(argv.first)
arg = argv.shift
if switch = @switches.find(arg)
values.set(switch)
elsif option = @options.find(arg)
value = argv.shift or raise ParsingError::MissingOptionValueError.new(option)
if option.multiary?
values.append(option, option.cast(value))
else
values.value(option, option.cast(value))
end
mandatory_options.delete(option)
else
raise ParsingError::UnknownSwitchError.new(arg) unless switch
end
end
@options.unarry.each do |o|
next unless o.has_default?
values.value(o, o.default_cast) if values.get(o) == nil
end
@options.multiary.each do |o|
next unless o.has_default?
values.value(o, o.default_cast) if values.get(o) == []
end
raise ParsingError::MandatoryOptionsNotSpecifiedError.new(mandatory_options) unless mandatory_options.empty?
argv.shift if argv.first == '--'
arguments = @arguments.dup
while argument = arguments.shift
value = if arguments.mandatory.length < argv.length
arg = argv.shift
if argument.multiary?
v = [arg]
while argv.length > arguments.length
v << argv.shift
end
v
else
arg
end
else
if argument.has_default?
argument.default
elsif not argument.mandatory?
argument.multiary? ? [] : nil
else
raise ParsingError::MandatoryArgumentNotSpecifiedError.new(argument) if argv.empty?
end
end
values.value(argument, argument.cast(value))
end
values.stdin = @stdin.cast(stdin) if @stdin
values
end
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#parse!(argv = ARGV, stdin = STDIN, stderr = STDERR, stdout = STDOUT) ⇒ Object
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# File 'lib/cli.rb', line 278
def parse!(argv = ARGV, stdin = STDIN, stderr = STDERR, stdout = STDOUT)
begin
pp = parse(argv, stdin, stderr)
if pp.help
stdout.write pp.help
exit 0
end
if pp.version
stdout.write pp.version
exit 0
end
if block_given?
begin
yield pp
rescue RuntimeError => e
raise ParsingError::UsageError, e.message
end
end
pp
rescue ParsingError => pe
usage!(pe, stderr)
end
end
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#stdin(name = :data, options = {}) ⇒ Object
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# File 'lib/cli.rb', line 134
def stdin(name = :data, options = {})
@stdin = DSL::Input.new(name, options)
end
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#switch(name, options = {}) ⇒ Object
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# File 'lib/cli.rb', line 156
def switch(name, options = {})
switch_dsl = DSL::Switch.new(name, options)
check_switch_collision!(switch_dsl)
@switches << switch_dsl
end
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#usage(msg = nil) ⇒ Object
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# File 'lib/cli.rb', line 307
def usage(msg = nil)
out = StringIO.new
out.puts msg if msg
out.print "Usage: #{CLI.name}"
out.print ' [switches|options]' if not @switches.empty? and not @options.optional.empty?
out.print ' [switches]' if not @switches.empty? and @options.optional.empty?
out.print ' [options]' if @switches.empty? and not @options.optional.empty?
@options.mandatory.each do |o|
out.print " #{o.switch} <value>"
end
out.print ' [--]' if not @arguments.empty? and (not @switches.empty? or not @options.empty?)
out.print ' ' unless @arguments.empty?
out.print(@arguments.map do |a|
v = ''
v += '[' unless a.mandatory?
v += a.multiary? ? a.to_s + '*': a.to_s
v += ']' unless a.mandatory?
v
end.join(' '))
out.print " < #{@stdin}" if @stdin
out.puts
out.puts @description if @description
if @stdin and @stdin.description?
out.puts "Input:"
out.puts " #{@stdin} - #{@stdin.description}"
end
unless @switches.empty?
out.puts "Switches:"
@switches.each do |s|
out.print ' '
out.print s.switch
out.print " (#{s.switch_short})" if s.has_short?
out.print " - #{s.description}" if s.description?
out.puts
end
end
unless @options.empty?
out.puts "Options:"
@options.each do |o|
unless o.multiary?
out.print " #{o.switch}"
else
out.print " #{o.switch}*"
end
out.print " (#{o.switch_short})" if o.has_short?
out.print ' (mandatory)' if o.mandatory?
if o.has_default_label?
out.print " [#{o.default_label}]"
elsif o.has_default?
out.print " [%s]" % o.default
end
out.print " - #{o.description}" if o.description?
out.puts
end
end
unless @arguments.empty?
out.puts "Arguments:"
@arguments.each do |a|
unless a.multiary?
out.print " #{a}"
else
out.print " #{a}*"
end
out.print ' (optional)' if not a.mandatory? and not a.has_default?
if a.has_default_label?
out.print " [#{a.default_label}]"
elsif a.has_default?
out.print " [%s]" % (a.default.is_a?(Array) ? a.default.join(' ') : a.default)
end
out.print " - #{a.description}" if a.description?
out.puts
end
end
out.rewind
out.read
end
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#usage!(msg = nil, io = STDERR) ⇒ Object
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# File 'lib/cli.rb', line 390
def usage!(msg = nil, io = STDERR)
msg = "Error: #{msg}" if msg
io.write usage(msg)
exit 42
end
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#version(version) ⇒ Object
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# File 'lib/cli.rb', line 130
def version(version)
@version = version.to_s
end
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