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Gem::Command

Base class for all Gem commands. When creating a new gem command, define #, #, #, #, # and # (as appropriate). See the above mentioned methods for details.

A very good example to look at is Gem::Commands::ContentsCommand

Attributes

command[R]

The name of the command.

options[R]

The options for the command.

defaults[RW]

The default options for the command.

program_name[RW]

The name of the command for command-line invocation.

summary[RW]

A short description of the command.

Public Class Methods

add_common_option(*args, &handler) click to toggle source
    # File lib/rubygems/command.rb, line 61
61:   def self.add_common_option(*args, &handler)
62:     Gem::Command.common_options << [args, handler]
63:   end
add_specific_extra_args(cmd,args) click to toggle source

Add a list of extra arguments for the given command. args may be an array or a string to be split on white space.

    # File lib/rubygems/command.rb, line 90
90:   def self.add_specific_extra_args(cmd,args)
91:     args = args.split(/\s+/) if args.kind_of? String
92:     specific_extra_args_hash[cmd] = args
93:   end
build_args() click to toggle source

Arguments used when building gems

    # File lib/rubygems/command.rb, line 49
49:   def self.build_args
50:     @build_args ||= []
51:   end
build_args=(value) click to toggle source
    # File lib/rubygems/command.rb, line 53
53:   def self.build_args=(value)
54:     @build_args = value
55:   end
common_options() click to toggle source
    # File lib/rubygems/command.rb, line 57
57:   def self.common_options
58:     @common_options ||= []
59:   end
extra_args() click to toggle source
    # File lib/rubygems/command.rb, line 65
65:   def self.extra_args
66:     @extra_args ||= []
67:   end
extra_args=(value) click to toggle source
    # File lib/rubygems/command.rb, line 69
69:   def self.extra_args=(value)
70:     case value
71:     when Array
72:       @extra_args = value
73:     when String
74:       @extra_args = value.split
75:     end
76:   end
new(command, summary=nil, defaults={}) click to toggle source

Initializes a generic gem command named command. summary is a short description displayed in `gem help commands`. defaults are the default options. Defaults should be mirrored in #, unless there are none.

When defining a new command subclass, use add_option to add command-line switches.

Unhandled arguments (gem names, files, etc.) are left in options[:args].

     # File lib/rubygems/command.rb, line 116
116:   def initialize(command, summary=nil, defaults={})
117:     @command = command
118:     @summary = summary
119:     @program_name = "gem #{command}"
120:     @defaults = defaults
121:     @options = defaults.dup
122:     @option_groups = Hash.new { |h,k| h[k] = [] }
123:     @parser = nil
124:     @when_invoked = nil
125:   end
specific_extra_args(cmd) click to toggle source

Return an array of extra arguments for the command. The extra arguments come from the gem configuration file read at program startup.

    # File lib/rubygems/command.rb, line 82
82:   def self.specific_extra_args(cmd)
83:     specific_extra_args_hash[cmd]
84:   end
specific_extra_args_hash() click to toggle source

Accessor for the specific extra args hash (self initializing).

     # File lib/rubygems/command.rb, line 98
 98:   def self.specific_extra_args_hash
 99:     @specific_extra_args_hash ||= Hash.new do |h,k|
100:       h[k] = Array.new
101:     end
102:   end

Public Instance Methods

add_extra_args(args) click to toggle source

Adds extra args from ~/.gemrc

     # File lib/rubygems/command.rb, line 347
347:   def add_extra_args(args)
348:     result = []
349: 
350:     s_extra = Gem::Command.specific_extra_args(@command)
351:     extra = Gem::Command.extra_args + s_extra
352: 
353:     until extra.empty? do
354:       ex = []
355:       ex << extra.shift
356:       ex << extra.shift if extra.first.to_s =~ /^[^-]/
357:       result << ex if handles?(ex)
358:     end
359: 
360:     result.flatten!
361:     result.concat(args)
362:     result
363:   end
add_option(*opts) click to toggle source

Add a command-line option and handler to the command.

See OptionParser#make_switch for an explanation of opts.

handler will be called with two values, the value of the argument and the options hash.

If the first argument of add_option is a Symbol, it’s used to group options in output. See `gem help list` for an example.

     # File lib/rubygems/command.rb, line 297
297:   def add_option(*opts, &handler) # :yields: value, options
298:     group_name = Symbol === opts.first ? opts.shift : :options
299: 
300:     @option_groups[group_name] << [opts, handler]
301:   end
arguments() click to toggle source

Override to provide details of the arguments a command takes. It should return a left-justified string, one argument per line.

For example:

  def usage
    "#{program_name} FILE [FILE ...]"
  end

  def arguments
    "FILE          name of file to find"
  end
     # File lib/rubygems/command.rb, line 217
217:   def arguments
218:     ""
219:   end
begins?(long, short) click to toggle source

True if long begins with the characters from short.

     # File lib/rubygems/command.rb, line 130
130:   def begins?(long, short)
131:     return false if short.nil?
132:     long[0, short.length] == short
133:   end
defaults_str() click to toggle source

Override to display the default values of the command options. (similar to arguments, but displays the default values).

For example:

  def defaults_str
    --no-gems-first --no-all
  end
     # File lib/rubygems/command.rb, line 231
231:   def defaults_str
232:     ""
233:   end
description() click to toggle source

Override to display a longer description of what this command does.

     # File lib/rubygems/command.rb, line 238
238:   def description
239:     nil
240:   end
execute() click to toggle source

Override to provide command handling.

# will be filled in with your parsed options, unparsed options will be left in options[:args].

See also: #, #, #

     # File lib/rubygems/command.rb, line 144
144:   def execute
145:     raise Gem::Exception, "generic command has no actions"
146:   end
get_all_gem_names() click to toggle source

Get all gem names from the command line.

     # File lib/rubygems/command.rb, line 163
163:   def get_all_gem_names
164:     args = options[:args]
165: 
166:     if args.nil? or args.empty? then
167:       raise Gem::CommandLineError,
168:             "Please specify at least one gem name (e.g. gem build GEMNAME)"
169:     end
170: 
171:     gem_names = args.select { |arg| arg !~ /^-/ }
172:   end
get_one_gem_name() click to toggle source

Get a single gem name from the command line. Fail if there is no gem name or if there is more than one gem name given.

     # File lib/rubygems/command.rb, line 178
178:   def get_one_gem_name
179:     args = options[:args]
180: 
181:     if args.nil? or args.empty? then
182:       raise Gem::CommandLineError,
183:             "Please specify a gem name on the command line (e.g. gem build GEMNAME)"
184:     end
185: 
186:     if args.size > 1 then
187:       raise Gem::CommandLineError,
188:             "Too many gem names (#{args.join(', ')}); please specify only one"
189:     end
190: 
191:     args.first
192:   end
get_one_optional_argument() click to toggle source

Get a single optional argument from the command line. If more than one argument is given, return only the first. Return nil if none are given.

     # File lib/rubygems/command.rb, line 198
198:   def get_one_optional_argument
199:     args = options[:args] || []
200:     args.first
201:   end
handle_options(args) click to toggle source

Handle the given list of arguments by parsing them and recording the results.

     # File lib/rubygems/command.rb, line 337
337:   def handle_options(args)
338:     args = add_extra_args(args)
339:     @options = @defaults.clone
340:     parser.parse!(args)
341:     @options[:args] = args
342:   end
handles?(args) click to toggle source

True if the command handles the given argument list.

     # File lib/rubygems/command.rb, line 324
324:   def handles?(args)
325:     begin
326:       parser.parse!(args.dup)
327:       return true
328:     rescue
329:       return false
330:     end
331:   end
invoke(*args) click to toggle source

Invoke the command with the given list of arguments.

     # File lib/rubygems/command.rb, line 262
262:   def invoke(*args)
263:     handle_options args
264: 
265:     if options[:help] then
266:       show_help
267:     elsif @when_invoked then
268:       @when_invoked.call options
269:     else
270:       execute
271:     end
272:   end
merge_options(new_options) click to toggle source

Merge a set of command options with the set of default options (without modifying the default option hash).

     # File lib/rubygems/command.rb, line 316
316:   def merge_options(new_options)
317:     @options = @defaults.clone
318:     new_options.each do |k,v| @options[k] = v end
319:   end
remove_option(name) click to toggle source

Remove previously defined command-line argument name.

     # File lib/rubygems/command.rb, line 306
306:   def remove_option(name)
307:     @option_groups.each do |_, option_list|
308:       option_list.reject! { |args, _| args.any? { |x| x =~ /^#{name}/ } }
309:     end
310:   end
show_help() click to toggle source

Display the help message for the command.

     # File lib/rubygems/command.rb, line 254
254:   def show_help
255:     parser.program_name = usage
256:     say parser
257:   end
show_lookup_failure(gem_name, version, errors=nil) click to toggle source

Display to the user that a gem couldn’t be found and reasons why

     # File lib/rubygems/command.rb, line 151
151:   def show_lookup_failure(gem_name, version, errors=nil)
152:     if errors and !errors.empty?
153:       alert_error "Could not find a valid gem '#{gem_name}' (#{version}), here is why:"
154:       errors.each { |x| say "          #{x.wordy}" }
155:     else
156:       alert_error "Could not find a valid gem '#{gem_name}' (#{version}) in any repository"
157:     end
158:   end
usage() click to toggle source

Override to display the usage for an individual gem command.

The text “[options]” is automatically appended to the usage text.

     # File lib/rubygems/command.rb, line 247
247:   def usage
248:     program_name
249:   end
when_invoked(&block) click to toggle source

Call the given block when invoked.

Normal command invocations just executes the execute method of the command. Specifying an invocation block allows the test methods to override the normal action of a command to determine that it has been invoked correctly.

     # File lib/rubygems/command.rb, line 282
282:   def when_invoked(&block)
283:     @when_invoked = block
284:   end

Private Instance Methods

configure_options(header, option_list) click to toggle source
     # File lib/rubygems/command.rb, line 426
426:   def configure_options(header, option_list)
427:     return if option_list.nil? or option_list.empty?
428: 
429:     header = header.to_s.empty? ? '' : "#{header} "
430:     @parser.separator "  #{header}Options:"
431: 
432:     option_list.each do |args, handler|
433:       dashes = args.select { |arg| arg =~ /^-/ }
434:       @parser.on(*args) do |value|
435:         handler.call(value, @options)
436:       end
437:     end
438: 
439:     @parser.separator ''
440:   end
create_option_parser() click to toggle source
     # File lib/rubygems/command.rb, line 375
375:   def create_option_parser
376:     @parser = OptionParser.new
377: 
378:     @parser.separator nil
379:     regular_options = @option_groups.delete :options
380: 
381:     configure_options "", regular_options
382: 
383:     @option_groups.sort_by { |n,_| n.to_s }.each do |group_name, option_list|
384:       @parser.separator nil
385:       configure_options group_name, option_list
386:     end
387: 
388:     @parser.separator nil
389:     configure_options "Common", Gem::Command.common_options
390: 
391:     unless arguments.empty?
392:       @parser.separator nil
393:       @parser.separator "  Arguments:"
394:       arguments.split(/\n/).each do |arg_desc|
395:         @parser.separator "    #{arg_desc}"
396:       end
397:     end
398: 
399:     @parser.separator nil
400:     @parser.separator "  Summary:"
401:     wrap(@summary, 80 - 4).split("\n").each do |line|
402:       @parser.separator "    #{line.strip}"
403:     end
404: 
405:     if description then
406:       formatted = description.split("\n\n").map do |chunk|
407:         wrap chunk, 80 - 4
408:       end.join "\n"
409: 
410:       @parser.separator nil
411:       @parser.separator "  Description:"
412:       formatted.split("\n").each do |line|
413:         @parser.separator "    #{line.rstrip}"
414:       end
415:     end
416: 
417:     unless defaults_str.empty?
418:       @parser.separator nil
419:       @parser.separator "  Defaults:"
420:       defaults_str.split(/\n/).each do |line|
421:         @parser.separator "    #{line}"
422:       end
423:     end
424:   end
parser() click to toggle source

Create on demand parser.

     # File lib/rubygems/command.rb, line 370
370:   def parser
371:     create_option_parser if @parser.nil?
372:     @parser
373:   end
wrap(text, width) click to toggle source

Wraps text to width

     # File lib/rubygems/command.rb, line 445
445:   def wrap(text, width) # :doc:
446:     text.gsub(/(.{1,#{width}})( +|$\n?)|(.{1,#{width}})/, "\\1\\3\n")
447:   end

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