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 # About GCLI

 ## GCLI is a Graphical Command Line Interpreter.

 GCLI is a command line for modern computers. When command lines were invented,

 computers were resource-limited, disconnected systems with slow multi-tasking

 and poor displays. The design of the Unix CLI made sense in 1970, but over 40

 years on, considering the pace of change, there are many improvements we can

 make.

 CLIs generally suffer from poor discoverability; It's hard when faced with a

 blank command line to work out what to do. As a result the majority of programs

 today use purely graphical user interfaces, however in doing so, they lose some

 of the benefits of CLIs. CLIs are still used because generally, in the hands of

 a skilled user they are faster, and have a wider range of available options.

 GCLI attempts to get the best of the GUI world and the CLI world to produce

 something that is both easy to use and learn as well as fast and powerful.

 GCLI has a type system to help ensure that users are inputting valid commands

 and to enable us to provide sensible context sensitive help. GCLI provides

 integration with JavaScript rather than being an alternative (like CoffeeScript).

 ## History

 GCLI was born as part of the

 [Bespin](http://ajaxian.com/archives/canvas-for-a-text-editor) project and was

 [discussed at the time](http://j.mp/bespin-cli). The command line component

 survived the rename of Bepsin to Skywriter and the merger with Ace, got a name

 of it's own (Cockpit) which didn't last long before the project was named GCLI.

 It is now being used in the Firefox's web console where it doesn't have a

 separate identity but it's still called GCLI outside of Firefox. It is also

 used in [Eclipse Orion](http://www.eclipse.org/orion/).

 ## Environments

 GCLI is designed to work in a number of environments:

 1. As a component of Firefox developer tools.

 2. As an adjunct to Orion/Ace and other online editors.

 3. As a plugin to any web-page wishing to provide its own set of commands.

 4. As part of a standalone web browser extension with it's own set of commands.

 ## Related Pages

 Other sources of GCLI documentation:

 - [Writing Commands](writing-commands.md)

 - [Writing Types](writing-types.md)

 - [Developing GCLI](developing-gcli.md)

 - [Writing Tests](writing-tests.md) / [Running Tests](running-tests.md)

 - [The Design of GCLI](design.md)

 - Source

   - The most up-to-date source is in [this Github repository](https://github.com/joewalker/gcli/).

   - When a feature is 'done' it's merged into the [Mozilla clone](https://github.com/mozilla/gcli/).

   - From which it flows into [Mozilla Central](https://hg.mozilla.org/mozilla-central/file/tip/browser/devtools/commandline).

 - [Demo of GCLI](http://mozilla.github.com/gcli/) with an arbitrary set of demo

   commands

 - Other Documentation

   - [Embedding docs](https://github.com/mozilla/gcli/blob/master/docs/index.md)

   - [Status page](http://mozilla.github.com/devtools/2011/status.html#gcli)

 ## Accessibility

 GCLI uses ARIA roles to guide a screen-reader as to the important sections to

 voice. We welcome [feedback on how these roles are implemented](https://bugzilla.mozilla.org/enter_bug.cgi?product=Firefox&component=Developer+Tools:+Graphic+Commandline+and+Toolbar&rep_platform=All&op_sys=All&short_desc=GCLI).

 The command line uses TAB as a method of completing current input, this

 prevents use of TAB for keyboard navigation. Instead of using TAB to move to

 the next field you can use F6. In addition to F6, ALT+TAB, CTRL+TAB, META+TAB

 make an attempt to move the focus on. How well this works depends on your

 OS/browser combination.

 ## Embedding GCLI

 There are 3 basic steps in using GCLI in your system.

 1. Import a GCLI JavaScript file.

    For serious use of GCLI you are likely to be creating a custom build (see

    below) however if you just want to have a quick play, you can use

    ``gcli-uncompressed.js`` from [the gh-pages branch of GCLI]

    (https://github.com/mozilla/gcli/tree/gh-pages)

    Just place the following wherever you place your script files.

         <script src="path/to/gcli-uncompressed.js" type="text/javascript"></script>

 2. Having imported GCLI, we need to tell it where to display. The simplest

    method is to include an elements with the id of ``gcli-input`` and

    ``gcli-display``.

         <input id="gcli-input" type="text"/>

         <div id="gcli-display"></div>

 3. Tell GCLI what commands to make available. See the sections on Writing

    Commands, Writing Types and Writing Fields for more information.

    GCLI uses the CommonJS AMD format for it's files, so a 'require' statement

    is needed to get started.

         require([ 'gcli/index' ], function(gcli) {

           gcli.addCommand(...); // Register custom commands

           gcli.createTerminal(); // Create a user interface

         });

    The createTerminal() function takes an ``options`` objects which allows

    customization. At the current time the documentation of these object is left

    to the source.

 ## Backwards Compatibility

 The goals of the GCLI project are:

 - Aim for very good backwards compatibility with code required from an

   'index' module. This means we will not break code without a cycle of

   deprecation warnings.

   There are currently 3 'index' modules:

   - gcli/index (all you need to get started with GCLI)

   - demo/index (a number of demo commands)

   - gclitest/index (GCLI test suite)

   Code from these modules uses the module pattern to prevent access to internal

   functions, so in essence, if you can get to it from an index module, you

   should be ok.

 - We try to avoid needless change to other modules, however we don't make any

   promises, and don't provide a deprecation cycle.

   Code from other modules uses classes rather than modules, so member variables

   are exposed. Many classes mark private members using the `_underscorePrefix`

   pattern. Particular care should be taken if access is needed to a private

   member.

 ## Creating Custom Builds

 GCLI uses [DryIce](https://github.com/mozilla/dryice) to create custom builds.

 If dryice is installed (``npm install .``) then you can create a built

 version of GCLI simply using ``node gcli.js standard``. DryIce supplies a custom

 module loader to replace RequireJS for built applications.

 The build will be output to the ``built`` directory. The directory will be

 created if it doesn't exist.