Starting with Node's built in REPL, add in a completely redone inspect formatter, actual functioning separate V8 contexts, keybindings to create, switch, and delete between them, combine it with a bunch of color. ULTRA REPL.
UltraREPL is designed to work with zero configuration as long as Node is installed. To get it you can clone it from this repo or simply install it with npm:
npm install ultra-repl
If installed with npm it should be set up to run in your path. I've yet to see this work in Windows, however, so I've tried to make it as easy as possible regardless. For direct loading you can go to
ultra-repl/bin where you'll find the .js file which can be run directly on OS X or Linux, and a .cmd file which can be run like an executable on Windows.
You should be greeted with something similar to this upon starting it:
this which will spit out the global context and everything in it. The formatting differences are immediately obvious.
In the module folder is a
settings folder with the
UltraREPL supports fully customizable keybindings that provide a lot of room to speed up workflow. Every user exposed command can be bound to any set of keys or a repl keyword. ctrl+alt+shift+key combos are possible for a keys excluding number pad. F keys works. All of the default handlers have been removed so that signal interrupts are customizable or skippable.
Beyond normal keybindings, UltraREPL also supports what I'm calling Cadances. That is a set of keybindings executed in order to create a new binding. For example, the default bindings have Clear Input as
esc, Clear Window as
esc esc and Quit as
esc esc esc. Similar to how the sig interrupt functions, but fully customizable with any combination of keys, any amount in order, and to execute any command. Simply string keybinds together with spaces to indicate a Cadance.
Toggling hiddens and builtins.
On startup the context is set to the default global one where Node initializes itself and where nearly all things usually run under normal usage. From here you keep using the global context or create a new one by hitting the keybind (F1 shows the commands). When a context is created it immediately is switched to. At this point all commands and actions which will be run in this context as if it is the one and only global one. Creating, switching, deleting, and resetting contexts is done by a keybinds and is always instantaneous.
There are some things that are (currently) shared between contexts. Required modules,
process, the various
ArrayBuffer constructors, Node's
Buffer, and the four timer functions, because currently Node doesn't provide a good way to make multiple copies. In the near future it will be changed, one way or another, so that nothing is required to be shared between contexts. Right now it's not required those items be copied, it's simply that if they are to be in multiple contexts then they are shared.
Everything else is unique per context: native objects and any code you run yourself. It is generally possible to put objects on multiple contexts but there are some things that don't work, like trying to run Object.* functions from one context on objects in another one. The settings for depth, hiddens, builtins, and colors are also specific to each context.
You can make and use as many contexts as you want.
Each context has a local scope object that contains variables not found on its global object or anywhere in the context, but are accessible from code run in the REPL. This works similarly to Node's module,
__filename. The difference is that you can change what's on the local context using the
New Global detection.
Evaluation results which are functions with readable source will be returned as syntax hightlighted code, utilizing aspects of CodeMirror2 along with modifications to work in the console.
Once the file system interface is more fleshed out I'll be able to accomplish the following pretty quickly:
- GUI-like interface with collapsable object views
- State/setting indicators
- Multi-line code input so you can actually develop in this
- Better tools for saving/loading/editing/running code from files
- Tools to easily add and edit commands/modules for the REPL itself
- Integration with external tools like npm
(The MIT License)
Copyright (c) 2012 Brandon Benvie email@example.com
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