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Introduction to Rebugger

Rebugger is an expression-level debugger for Julia. It has two modes of action:

• an "interpret" mode that lets you step through code, set breakpoints, and other manipulations common to "typical" debuggers;
• an "edit" mode that presents method bodies as objects for manipulation, allowing you to interactively play with the code at different stages of execution.

The name "Rebugger" has 3 meanings:

• it is aREPL-based debugger (more on that below)
• it is theRevise-based debugger
• it supports repeated-execution debugging

Installation

Begin with

(v1.0) pkg> add Rebugger

You can experiment with Rebugger with just

julia> using Rebugger

If you eventually decide you like Rebugger, you can optionally configure it so that it is always available (seeConfiguration).

Keyboard shortcuts

Most of Rebugger's functionality gets triggered by special keyboard shortcuts added to Julia's REPL. Unfortunately, different operating systems and desktop environments vary considerably in their key bindings, and it is possible that the default choices in Rebugger are already assigned other meanings on your platform. There does not appear to be any one set of choices that works on all platforms.

The best strategy is to try the demos inUsage; if the default shortcuts are already taken on your platform, then you can easily configure Rebugger to use different bindings (seeConfiguration).

Some platforms are known to require or benefit from special attention:

macOS

If you're on macOS, you may want to enable "Useoption as the Meta key" in your Terminal settings to avoid the need to press Esc before each Rebugger command.

Ubuntu

The default meta key on some Ubuntu versions is left Alt, which is equivalent to Esc Alt on the default Gnome terminal emulator. However, even with this tip you may encounter problems because Rebugger's default key bindings may be assigned to activate menu options within the terminal window, andthis appears not to be configurable. Affected users may wish toCustomize keybindings.