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