Breakpoints

After installation these buttons should appear on the toolbar:

The extension adds 8 buttons:

Installation

Copy the breakpoints.js file, and add require(['/static/custom/breakpoints.js']) to custom.js in your profile's /static/custom directory, so it looks like this:

$([IPython.events]).on('app_initialized.NotebookApp', function(){
  require(['/static/custom/breakpoints.js'])
});

Internals

The extension registers a codemirror gutter. Currently, this makes it incompatible with the codefolding-extension, as both extensions react on gutter clicks.

A breakpoint flag is stored as metadata in each cell: cell.metadata.run_control.breakpoint = true | false

As metadata is saved in the IPython notebook, all breakpoints are saved, too.