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Viewing File: command_set.rb
class Pry
class NoCommandError < StandardError
def initialize(match, owner)
super "Command '#{match}' not found in command set #{owner}"
end
end
# This class is used to create sets of commands. Commands can be imported from
# different sets, aliased, removed, etc.
class CommandSet
include Enumerable
include Pry::Helpers::BaseHelpers
attr_reader :helper_module
# @param [Array<Commandset>] imported_sets
# Sets which will be imported automatically
# @yield Optional block run to define commands
def initialize(*imported_sets, &block)
@commands = {}
@helper_module = Module.new
import(*imported_sets)
instance_eval(&block) if block
end
# Defines a new Pry command.
# @param [String, Regexp] match The start of invocations of this command.
# @param [String] description A description of the command.
# @param [Hash] options The optional configuration parameters.
# @option options [Boolean] :keep_retval Whether or not to use return value
# of the block for return of `command` or just to return `nil`
# (the default).
# @option options [Array<String>] :requires_gem Whether the command has
# any gem dependencies, if it does and dependencies not met then
# command is disabled and a stub proc giving instructions to
# install command is provided.
# @option options [Boolean] :interpolate Whether string #{} based
# interpolation is applied to the command arguments before
# executing the command. Defaults to true.
# @option options [String] :listing The listing name of the
# command. That is the name by which the command is looked up by
# help and by show-command. Necessary for commands with regex matches.
# @option options [Boolean] :use_prefix Whether the command uses
# `Pry.config.command_prefix` prefix (if one is defined). Defaults
# to true.
# @option options [Boolean] :shellwords Whether the command's arguments
# should be split using Shellwords instead of just split on spaces.
# Defaults to true.
# @yield The action to perform. The parameters in the block
# determines the parameters the command will receive. All
# parameters passed into the block will be strings. Successive
# command parameters are separated by whitespace at the Pry prompt.
# @example
# MyCommands = Pry::CommandSet.new do
# command "greet", "Greet somebody" do |name|
# puts "Good afternoon #{name.capitalize}!"
# end
# end
#
# # From pry:
# # pry(main)> _pry_.commands = MyCommands
# # pry(main)> greet john
# # Good afternoon John!
# # pry(main)> help greet
# # Greet somebody
# @example Regexp command
# MyCommands = Pry::CommandSet.new do
# command /number-(\d+)/, "number-N regex command", :listing => "number" do |num, name|
# puts "hello #{name}, nice number: #{num}"
# end
# end
#
# # From pry:
# # pry(main)> _pry_.commands = MyCommands
# # pry(main)> number-10 john
# # hello john, nice number: 10
# # pry(main)> help number
# # number-N regex command
def block_command(match, description="No description.", options={}, &block)
description, options = ["No description.", description] if description.is_a?(Hash)
options = Pry::Command.default_options(match).merge!(options)
@commands[match] = Pry::BlockCommand.subclass(match, description, options, helper_module, &block)
end
alias_method :command, :block_command
# Defines a new Pry command class.
#
# @param [String, Regexp] match The start of invocations of this command.
# @param [String] description A description of the command.
# @param [Hash] options The optional configuration parameters, see {#command}
# @yield The class body's definition.
#
# @example
# Pry::Commands.create_command "echo", "echo's the input", :shellwords => false do
# def options(opt)
# opt.banner "Usage: echo [-u | -d] <string to echo>"
# opt.on :u, :upcase, "ensure the output is all upper-case"
# opt.on :d, :downcase, "ensure the output is all lower-case"
# end
#
# def process
# raise Pry::CommandError, "-u and -d makes no sense" if opts.present?(:u) && opts.present?(:d)
# result = args.join(" ")
# result.downcase! if opts.present?(:downcase)
# result.upcase! if opts.present?(:upcase)
# output.puts result
# end
# end
#
def create_command(match, description="No description.", options={}, &block)
description, options = ["No description.", description] if description.is_a?(Hash)
options = Pry::Command.default_options(match).merge!(options)
@commands[match] = Pry::ClassCommand.subclass(match, description, options, helper_module, &block)
@commands[match].class_eval(&block)
@commands[match]
end
# Execute a block of code before a command is invoked. The block also
# gets access to parameters that will be passed to the command and
# is evaluated in the same context.
# @param [String, Regexp] search The match or listing of the command.
# @yield The block to be run before the command.
# @example Display parameter before invoking command
# Pry.config.commands.before_command("whereami") do |n|
# output.puts "parameter passed was #{n}"
# end
def before_command(search, &block)
cmd = find_command_by_match_or_listing(search)
cmd.hooks[:before].unshift block
end
# Execute a block of code after a command is invoked. The block also
# gets access to parameters that will be passed to the command and
# is evaluated in the same context.
# @param [String, Regexp] search The match or listing of the command.
# @yield The block to be run after the command.
# @example Display text 'command complete' after invoking command
# Pry.config.commands.after_command("whereami") do |n|
# output.puts "command complete!"
# end
def after_command(search, &block)
cmd = find_command_by_match_or_listing(search)
cmd.hooks[:after] << block
end
def each(&block)
@commands.each(&block)
end
# Removes some commands from the set
# @param [Array<String>] searches the matches or listings of the commands to remove
def delete(*searches)
searches.each do |search|
cmd = find_command_by_match_or_listing(search)
@commands.delete cmd.match
end
end
# Imports all the commands from one or more sets.
# @param [Array<CommandSet>] sets Command sets, all of the commands of which
# will be imported.
# @return [Pry::CommandSet] Returns the reciever (a command set).
def import(*sets)
sets.each do |set|
@commands.merge! set.to_hash
helper_module.send :include, set.helper_module
end
self
end
# Imports some commands from a set
# @param [CommandSet] set Set to import commands from
# @param [Array<String>] matches Commands to import
# @return [Pry::CommandSet] Returns the reciever (a command set).
def import_from(set, *matches)
helper_module.send :include, set.helper_module
matches.each do |match|
cmd = set.find_command_by_match_or_listing(match)
@commands[cmd.match] = cmd
end
self
end
# @param [String, Regexp] match_or_listing The match or listing of a command.
# of the command to retrieve.
# @return [Command] The command object matched.
def find_command_by_match_or_listing(match_or_listing)
cmd = (@commands[match_or_listing] ||
Pry::Helpers::BaseHelpers.find_command(match_or_listing, @commands))
cmd or raise ArgumentError, "Cannot find a command: '#{match_or_listing}'!"
end
# Aliases a command
# @param [String, Regex] match The match of the alias (can be a regex).
# @param [String] action The action to be performed (typically
# another command).
# @param [Hash] options The optional configuration parameters,
# accepts the same as the `command` method, but also allows the
# command description to be passed this way too as `:desc`
# @example Creating an alias for `ls -M`
# Pry.config.commands.alias_command "lM", "ls -M"
# @example Pass explicit description (overriding default).
# Pry.config.commands.alias_command "lM", "ls -M", :desc => "cutiepie"
def alias_command(match, action, options={})
cmd = find_command(action) or fail "Command: `#{action}` not found"
original_options = cmd.options.dup
options = original_options.merge!({
:desc => "Alias for `#{action}`",
:listing => match
}).merge!(options)
# ensure default description is used if desc is nil
desc = options.delete(:desc).to_s
c = block_command match, desc, options do |*args|
run action, *args
end
c.class_eval do
define_method(:complete) do |input|
cmd.new(context).complete(input)
end
end
c.group "Aliases"
c
end
# Rename a command. Accepts either match or listing for the search.
#
# @param [String, Regexp] new_match The new match for the command.
# @param [String, Regexp] search The command's current match or listing.
# @param [Hash] options The optional configuration parameters,
# accepts the same as the `command` method, but also allows the
# command description to be passed this way too.
# @example Renaming the `ls` command and changing its description.
# Pry.config.commands.rename "dir", "ls", :description => "DOS friendly ls"
def rename_command(new_match, search, options={})
cmd = find_command_by_match_or_listing(search)
options = {
:listing => new_match,
:description => cmd.description
}.merge!(options)
@commands[new_match] = cmd.dup
@commands[new_match].match = new_match
@commands[new_match].description = options.delete(:description)
@commands[new_match].options.merge!(options)
@commands.delete(cmd.match)
end
def disabled_command(name_of_disabled_command, message, matcher=name_of_disabled_command)
create_command name_of_disabled_command do
match matcher
description ""
define_method(:process) do
output.puts "DISABLED: #{message}"
end
end
end
# Sets or gets the description for a command (replacing the old
# description). Returns current description if no description
# parameter provided.
# @param [String, Regexp] search The command match.
# @param [String?] description (nil) The command description.
# @example Setting
# MyCommands = Pry::CommandSet.new do
# desc "help", "help description"
# end
# @example Getting
# Pry.config.commands.desc "amend-line"
def desc(search, description=nil)
cmd = find_command_by_match_or_listing(search)
return cmd.description if !description
cmd.description = description
end
# Defines helpers methods for this command sets.
# Those helpers are only defined in this command set.
#
# @yield A block defining helper methods
# @example
# helpers do
# def hello
# puts "Hello!"
# end
#
# include OtherModule
# end
def helpers(&block)
helper_module.class_eval(&block)
end
# @return [Array]
# The list of commands provided by the command set.
def list_commands
@commands.keys
end
alias_method :keys, :list_commands
def to_hash
@commands.dup
end
alias_method :to_h, :to_hash
# Find a command that matches the given line
# @param [String] pattern The line that might be a command invocation
# @return [Pry::Command, nil]
def [](pattern)
@commands.values.select do |command|
command.matches?(pattern)
end.sort_by do |command|
command.match_score(pattern)
end.last
end
alias_method :find_command, :[]
#
# Re-assign the command found at _pattern_ with _command_.
#
# @param [Regexp, String] pattern
# The command to add or replace(found at _pattern_).
#
# @param [Pry::Command] command
# The command to add.
#
# @return [Pry::Command]
# Returns the new command (matched with "pattern".)
#
# @example
# Pry.config.commands["help"] = MyHelpCommand
#
def []=(pattern, command)
if command.equal?(nil)
return @commands.delete(pattern)
end
unless Class === command && command < Pry::Command
raise TypeError, "command is not a subclass of Pry::Command"
end
bind_command_to_pattern = pattern != command.match
if bind_command_to_pattern
command_copy = command.dup
command_copy.match = pattern
@commands[pattern] = command_copy
else
@commands[pattern] = command
end
end
#
# Add a command to set.
#
# @param [Command] command
# a subclass of Pry::Command.
#
def add_command(command)
self[command.match] = command
end
# Find the command that the user might be trying to refer to.
# @param [String] search The user's search.
# @return [Pry::Command?]
def find_command_for_help(search)
find_command(search) || (begin
find_command_by_match_or_listing(search)
rescue ArgumentError
nil
end)
end
# Is the given line a command invocation?
# @param [String] val
# @return [Boolean]
def valid_command?(val)
!!find_command(val)
end
# Process the given line to see whether it needs executing as a command.
# @param [String] val The line to execute
# @param [Hash] context The context to execute the commands with
# @return [CommandSet::Result]
def process_line(val, context={})
if command = find_command(val)
context = context.merge(:command_set => self)
retval = command.new(context).process_line(val)
Result.new(true, retval)
else
Result.new(false)
end
end
# @private (used for testing)
def run_command(context, match, *args)
command = @commands[match] or raise NoCommandError.new(match, self)
command.new(context).call_safely(*args)
end
# Generate completions for the user's search.
# @param [String] search The line to search for
# @param [Hash] context The context to create the command with
# @return [Array<String>]
def complete(search, context={})
if command = find_command(search)
command.new(context).complete(search)
else
@commands.keys.select do |key|
String === key && key.start_with?(search)
end.map{ |key| key + " " }
end
end
end
# Wraps the return result of process_commands, indicates if the
# result IS a command and what kind of command (e.g void)
class Result
attr_reader :retval
def initialize(is_command, retval = nil)
@is_command, @retval = is_command, retval
end
# Is the result a command?
# @return [Boolean]
def command?
@is_command
end
# Is the result a command and if it is, is it a void command?
# (one that does not return a value)
# @return [Boolean]
def void_command?
retval == Command::VOID_VALUE
end
end
end