Download it here and extract it into your eclipse/plugins directory. Make sure that you have a directory called edu.mit.lcs.haystack.adt under the eclipse/plugins directory.

You will need to restart Eclipse.

Features

• Syntax highlighting, highlighting of matching brackets
• Tooltip description of URIs by mouse hover or by invoking the Show Tooltip Description command in the Editmenu (shortcut key: Ctrl-Shift-Space, methods are shown with parameters)
• Automatic closing of brackets, including {, [, (, #[, ", and '

• Outline view
• Indications of errors and warnings as you type in code editor as well as Outline

• Content assist: completion of URIs and variables (when you type ":" or invoke the Content Assist command from the Edit menu)
• Quick fix: available through the Edit menu or through the shortcut key Ctrl-1; more specifically, ADT can automatically insert a @prefix declaration for you

• Locate references to a resource over the entire Adenine codebase: Invoke the Open Adenine Resource command from the Navigate menu. The resulting dialog box acts like the Open Type dialog box. You can use prefixes in this dialog box. To specify a complete URI, use angle brackets. Wildcards are supported
• Go to Adenine item: put the cursor on a URI (such as a method) that you want to quickly go to and invoke the Go to Adenine item... command from the Navigate menu (shortcut key F3). If there are more than one locations where that URI is used as a subject or as a method declaration, then the Open Adenine Resource dialog will be shown

Troubleshooting

The Open Adenine Resource command might not show up by default in the Navigate menu for you. In that case, right click on the toolbar, choose Customize Perspective..., expand Other, and check Adenine Action Set.