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almost finished readme

This commit is contained in:
John Mair 2011-04-24 02:03:56 +12:00
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commit fb5df5140d

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@ -418,7 +418,7 @@ avaiable.
### Other Features and limitations ### Other Features and limitations
#### Features: #### Other Features:
* Pry can be invoked both at the command-line and used as a more * Pry can be invoked both at the command-line and used as a more
powerful alternative to IRB or it can be invoked at runtime and used powerful alternative to IRB or it can be invoked at runtime and used
@ -431,6 +431,11 @@ as a developer consoler / debugger.
* Use `_ex_` to recover the last exception. * Use `_ex_` to recover the last exception.
* Use `_file_` and `_dir_` to refer to the associated file or * Use `_file_` and `_dir_` to refer to the associated file or
directory containing the definition for a method. directory containing the definition for a method.
* A trailing ';' on an entered expression suppresses the display of
the evaluation output.
* Typing `!` on a line by itself will clear the input buffer - useful for
getting you out of a situation where the parsing process
goes wrong and you get stuck in an endless read loop.
* Pry supports tab completion. * Pry supports tab completion.
* Pry has multi-line support built in. * Pry has multi-line support built in.
* Use `^d` (control-d) to quickly break out of a session. * Use `^d` (control-d) to quickly break out of a session.
@ -448,86 +453,15 @@ for reading; `Pry#re` for eval; `Pry#rep` for printing; and `Pry#repl`
for the loop (`Pry.start` simply wraps `Pry.new.repl`). You can for the loop (`Pry.start` simply wraps `Pry.new.repl`). You can
invoke any of these methods directly depending on exactly what aspect of the functionality you need. invoke any of these methods directly depending on exactly what aspect of the functionality you need.
###Limitations: #### Limitations:
* Some Pry commands (e.g `show-command`) do not work in Ruby 1.8. * Some Pry commands (e.g `show-command`) do not work in Ruby 1.8.
* `method_source` functionality does not work in JRuby. * `method_source` functionality does not work in JRuby with Ruby 1.8
* 1.9 support requires `Ripper` - some implementations may not support this. * Color support does not work in JRUby with Ruby 1.9 (due to a
limitation in JRuby's regex).
Commands * Tab completion is currently a bit broken/limited this will have a
----------- major overhaul in a future version.
### The Pry API:
* `Pry.start()` Starts a Read-Eval-Print-Loop on the object it
receives as a parameter. In the case of no parameter it operates on
top-level (main). It can receive any object or a `Binding`
object as parameter. `Pry.start()` is implemented as `Pry.new.repl()`
* `obj.pry` and `pry(obj)` may also be used as alternative syntax to
`Pry.start(obj)`.
However there are some differences. `obj.pry` opens
a Pry session on the receiver whereas `Pry.start` (with no parameter)
will start a Pry session on top-level. The other form of the `pry`
method: `pry(obj)` will also start a Pry session on its parameter.
The `pry` method invoked by itself, with no explict receiver and no
parameter will start a Pry session on the implied receiver. It is
perhaps more useful to invoke it in this form `pry(binding)` or
`binding.pry` so as to get access to locals in the current context.
Another difference is that `Pry.start()` accepts a second parameter
that is a hash of configuration options (discussed further, below).
* If, for some reason you do not want to 'loop' then use `Pry.new.rep()`; it
only performs the Read-Eval-Print section of the REPL - it ends the
session after just one line of input. It takes the same parameters as
`Pry#repl()`
* Likewise `Pry#re()` only performs the Read-Eval section of the REPL,
it returns the result of the evaluation or an Exception object in
case of error. It also takes the same parameters as `Pry#repl()`
* Similarly `Pry#r()` only performs the Read section of the REPL, only
returning the Ruby expression (as a string). It takes the same parameters as all the others.
* `Pry.run_command COMMAND` enables you to invoke Pry commands outside
of a session, e.g `Pry.run_command "ls -m", :context => MyObject`. See
docs for more info.
### Session commands
Pry supports a few commands inside the session itself. These commands are
not methods and must start at the beginning of a line, with no
whitespace in between.
If you want to access a method of the same name, prefix the invocation by whitespace.
* Typing `!` on a line by itself will clear the input buffer - useful for
getting you out of a situation where the parsing process
goes wrong and you get stuck in an endless read loop.
* `status` shows status information about the current session.
* `whereami AROUND` shows the code context of the session. Shows
AROUND lines either side of the current line.
* `version` Show Pry version information
* `help` shows the list of session commands with brief explanations.
* `toggle-color` turns on and off syntax highlighting.
* `simple-prompt` toggles the simple prompt mode.
* `exit` or `quit` or `back` or `^d` (control-d) will end the current Pry session and go
back to the calling process or back one level of nesting (if there
are nested sessions).
* `ls [OPTIONS] [VAR]` returns a list of local variables, instance variables, and
methods, etc. Highly flexible. See `ls --help` for more info.
* `cat VAR` Calls `inspect` on `VAR`
* `cd VAR` Starts a `Pry` session on the variable VAR. E.g `cd @x`
(use `cd ..` to go back).
* `show-method [OPTIONS] METH` Displays the sourcecode for the method
`METH`. e.g `show-method hello`. See `show-method --help` for more info.
* `show-doc [OPTIONS] METH` Displays comments for `METH`. See `show-doc
--help` for more info.
* `show-command COMMAND` Displays the sourcecode for the given Pry
command. e.g: `show-command cd`
* `jump-to NEST_LEVEL` Unwinds the Pry stack (nesting level) until the appropriate nesting level is reached.
* `exit-all` breaks out of all Pry nesting levels and returns to the
calling process.
Syntax Highlighting Syntax Highlighting
-------------------- --------------------
@ -580,3 +514,15 @@ Contact
------- -------
Problems or questions contact me at [github](http://github.com/banister) Problems or questions contact me at [github](http://github.com/banister)
Contributors
------------
The Pry team consists of:
banisterfiend
epitron
injekt
Mon_Ouie