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added Pry.sessions and Pry#parent, for more info on pry sessions. Also completed more documentation
This commit is contained in:
John Mair
parent
ead507210d
commit
ce3532e7ca
3 changed files with 112 additions and 42 deletions
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@ -16,7 +16,7 @@ commands such as `show_method` and `jump_to`
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* Read the [documentation](http://rdoc.info/github/banister/pry/master/file/README.markdown)
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* See the [source code](http://github.com/banister/pry)
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Example: Interacting with an object at runtime
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Example: Interacting with an object at runtime
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---------------------------------------
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With the `Object#pry` method we can pry (open an irb-like session) on
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@ -24,7 +24,7 @@ an object. In the example below we open a Pry session for the `Test` class and e
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an instance variable. The current thread is halted for the duration of the session.
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require 'pry'
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class Test
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def self.hello() "hello world" end
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end
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@ -54,13 +54,13 @@ effect:
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You can also use the `Pry.start(obj)` or `pry(obj)` syntax to start a pry session on
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`obj`. e.g
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Pry.start 5
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Pry.start(5)
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Beginning Pry session for 5
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pry(5)>
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OR
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pry 6
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pry(6)
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beginning Pry session for 6
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pry(6)>
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@ -103,7 +103,7 @@ command. E.g
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2. 100
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3. "friend"
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=> nil
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We can then jump back to any of the previous nesting levels by using
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the `jump_to` command:
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@ -113,7 +113,7 @@ the `jump_to` command:
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=> 100
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pry(Hello):1>
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If we just want to go back one level of nesting we can of course
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If we just want to go back one level of nesting we can of course
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use the `quit` or `exit` or `back` commands.
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To break out of all levels of Pry nesting and return immediately to the
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@ -125,7 +125,7 @@ calling process use `exit_all`:
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Ending Pry session for Hello
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Ending Pry session for main
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=> main
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# program resumes here
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Features and limitations
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@ -167,7 +167,7 @@ invoke any of these methods directly depending on exactly what aspect of the fun
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see [ripl](https://github.com/cldwalker/ripl)
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* Pry's `show_method` and `show_doc` commands do not work
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in Ruby 1.8.
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Commands
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-----------
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@ -196,7 +196,7 @@ that is a hash of configuration options (discussed further, below).
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* If, for some reason you do not want to 'loop' then use `Pry.new.rep()`; it
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only performs the Read-Eval-Print section of the REPL - it ends the
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session after just one line of input. It takes the same parameters as
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`Pry#repl()`
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`Pry#repl()`
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* Likewise `Pry#re()` only performs the Read-Eval section of the REPL,
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it returns the result of the evaluation or an Exception object in
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case of error. It also takes the same parameters as `Pry#repl()`
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@ -262,8 +262,8 @@ are:
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Local customization (applied to a single Pry session) is done by
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passing config hash options to `Pry.start()` or to `Pry.new()`; also the
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same accessors as described above for the `Pry` class also exist for a
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Pry instance.
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same accessors as described above for the `Pry` class exist for a
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Pry instance so that customization can occur during runtime.
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### Input:
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@ -278,7 +278,7 @@ this input by default:
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Pry.input = StringIO.new("@x = 10\nexit")
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Object.pry
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Object.instance_variable_get(:@x) #=> 10
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The above will execute the code in the `StringIO`
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@ -291,19 +291,26 @@ session will hang as it loops indefinitely awaiting new input.
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The settings for a specific session override the global settings
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(discussed above). There are two ways to set input for a specific pry session: At the
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point the session is started, or within the session itself:
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point the session is started, or within the session itself (at runtime):
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Here is the first case:
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##### At session start
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Pry.start(Object, :input => StringIO.new("@x = 10\nexit"))
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Object.instance_variable_get(:@x) #=> 10
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##### At runtime
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If you want to set the input object within the session itself you use
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the special `_pry_` local variable which represents the Pry instance
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managing the current session; inside the session we type:
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_pry_.input = StringIO.new("@x = 10\nexit")
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Note we can also set the input object for the parent Pry session (if
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the current session is nested) like so:
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_pry_.parent.input = StringIO.new("@x = 10\nexit")
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### Output
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For output Pry accepts any object that implements the `puts` method. This
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@ -317,27 +324,27 @@ this output by default:
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Pry.output = StringIO.new
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Object.pry
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Object.instance_variable_get(:@x) #=> 10
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#### Example: Setting output for a specific session
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As per Input, given above, we set the local output as follows:
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Here is the first case:
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##### At session start
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Pry.start(Object, :output => StringIO.new("@x = 10\nexit"))
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Object.instance_variable_get(:@x) #=> 10
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And to change output from within the session itself:
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##### At runtime
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_pry_.output = StringIO.new
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### Commands
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Pry commands are not methods; they are commands that are intercepted
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and executed before a Ruby eval takes place. Pry comes with a default
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command set, but these commands can be augmented or overriden by
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command set (`Pry::Commands`), but these commands can be augmented or overriden by
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user-specified ones.
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A valid Pry command object must inherit from
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@ -359,7 +366,7 @@ A valid Pry command object must inherit from
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Then inside a pry session:
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(pry)> hello john
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pry(main)> hello john
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hello john!
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=> nil
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@ -367,12 +374,12 @@ Then inside a pry session:
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As in the case of `input` and `output`:
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At session start:
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##### At session start:
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Pry.start(self, :commands => MyCommands)
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From within the session:
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##### At runtime:
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_pry_.commands = MyCommands
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#### The command API
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@ -415,8 +422,51 @@ for you. Typing `help` in a Pry session will show a list of commands
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to the user followed by their descriptions. Passing a parameter to
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`help` with the command name will just return the description of that specific command.
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### Hooks
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Currently Pry supports just two hooks: `before_session` and
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`after_session`. These hooks are invoked before a Pry session starts
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and after a session ends respectively. The default hooks used are
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stored in the `Pry::DEFAULT_HOOKS` and just output the text `"Beginning
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Pry session for <obj>"` and `"Ending Pry session for <obj>"`.
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#### Example: Setting global hooks
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All subsequent Pry instances will use these hooks as default:
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Pry.hooks = {
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:before_session => proc { |out, obj| out.puts "Opened #{obj}" },
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:after_session => proc { |out, obj| out.puts "Closed #{obj}" }
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}
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5.pry
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Inside the session:
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Opened 5
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pry(5)> exit
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Closed 5
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Note that the `before_session` and `after_session` procs receive the
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current session's output object and session receiver as parameters.
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#### Example: Setting hooks for a specific session
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Like all the other customization options, the global default (as
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explained above) can be overriden for a specific session, either at
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session start or during runtime.
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##### At session start
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Pry.start(self, :hooks => { :before_session => proc { puts "hello world!" },
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:after_session => proc { puts "goodbye world!" }
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})
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##### At runtime
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_pry_.hooks = { :before_session => proc { puts "puts "hello world!" } }
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Contact
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-------
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@ -20,7 +20,7 @@ class Pry
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# This method should not need to be accessed directly.
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# @return [Pry] The active Pry instance.
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attr_accessor :active_instance
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# Get/Set the object to use for input by default by all Pry instances.
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# @return [#readline] The object to use for input by default by all
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# Pry instances.
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@ -57,6 +57,7 @@ class Pry
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# prompts by default by all Pry instances.
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attr_accessor :prompt
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end
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# Start a Pry REPL.
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# @param [Object, Binding] target The receiver of the Pry session
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# @param [Hash] options
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@ -96,4 +97,11 @@ class Pry
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def @nesting.level
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last.is_a?(Array) ? last.first : nil
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end
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# Return all active Pry sessions.
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# @return [Array<Pry>] Active Pry sessions.
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def self.sessions
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# last element in nesting array is the pry instance
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nesting.map(&:last)
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end
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end
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@ -12,7 +12,7 @@ class Pry
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# @param [Hash] options The optional configuration parameters.
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# @option options [#readline] :input The object to use for input. (see input.rb)
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# @option options [#puts] :output The object to use for output. (see output.rb)
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# @option options [Pry::CommandBase] :commands The object to use for
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# @option options [Pry::CommandBase] :commands The object to use for
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# commands. (see commands.rb)
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# @option options [Hash] :hooks The defined hook Procs (see hooks.rb)
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# @option options [Array<Proc>] :default_prompt The array of Procs
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@ -45,13 +45,25 @@ class Pry
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self.class.nesting = v
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end
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# Return parent of current Pry session.
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# @return [Pry] The parent of the current Pry session.
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def parent
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idx = Pry.sessions.index(self)
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if idx > 0
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Pry.sessions[idx - 1]
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else
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nil
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end
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end
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# Execute the hook `hook_name`, if it is defined.
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# @param [Symbol] hook_name The hook to execute
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# @param [Array] args The arguments to pass to the hook.
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def exec_hook(hook_name, *args, &block)
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hooks[hook_name].call(*args, &block) if hooks[hook_name]
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end
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# Start a read-eval-print-loop.
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# If no parameter is given, default to top-level (main).
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# @param [Object, Binding] target The receiver of the Pry session
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@ -63,7 +75,7 @@ class Pry
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target_self = target.eval('self')
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exec_hook :before_session, output, target_self
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# cannot rely on nesting.level as
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# nesting.level changes with new sessions
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nesting_level = nesting.size
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@ -73,26 +85,26 @@ class Pry
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# Make sure special locals exist
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target.eval("_pry_ = Pry.active_instance")
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target.eval("_ = Pry.last_result")
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break_level = catch(:breakout) do
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nesting.push [nesting.size, target_self]
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nesting.push [nesting.size, target_self, self]
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loop do
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rep(target)
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rep(target)
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end
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end
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nesting.pop
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exec_hook :after_session, output, target_self
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# keep throwing until we reach the desired nesting level
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if nesting_level != break_level
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throw :breakout, break_level
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throw :breakout, break_level
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end
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target_self
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end
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# Perform a read-eval-print.
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# If no parameter is given, default to top-level (main).
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# @param [Object, Binding] target The receiver of the read-eval-print
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@ -152,11 +164,11 @@ class Pry
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process_commands(val, eval_string, target)
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eval_string << "#{val}\n"
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break eval_string if valid_expression?(eval_string)
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end
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end
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# Process Pry commands. Pry commands are not Ruby methods and are evaluated
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# prior to Ruby expressions.
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# Commands can be modified/configured by the user: see `Pry::Commands`
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@ -174,7 +186,7 @@ class Pry
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if pattern
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last_match = Regexp.last_match
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options = {
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:captures => last_match ? last_match.captures : nil,
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:eval_string => eval_string,
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@ -208,7 +220,7 @@ class Pry
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input.readline
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end
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end
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end
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end
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# Returns the appropriate prompt to use.
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# This method should not need to be invoked directly.
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@ -217,7 +229,7 @@ class Pry
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# @param [Object] target_self The receiver of the Pry session.
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# @return [String] The prompt.
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def select_prompt(first_line, target_self)
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if first_line
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Array(prompt).first.call(target_self, nesting.level)
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else
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@ -238,10 +250,10 @@ class Pry
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def valid_expression?(code)
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!!Ripper::SexpBuilder.new(code).parse
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end
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else
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require 'ruby_parser'
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# Determine if a string of code is a valid Ruby expression.
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# Ruby 1.9 uses Ripper, Ruby 1.8 uses RubyParser.
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# @param [String] code The code to validate.
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@ -257,7 +269,7 @@ class Pry
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true
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end
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end
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# Return a `Binding` object for `target` or return `target` if it is
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# already a `Binding`.
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# In the case where `target` is top-level then return `TOPLEVEL_BINDING`
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