Line wrapping

[hellpanderrr]

I've updated ipython-notebook to Jupyter and noticed that code wrapping in cells is turned off now. In previous version you could turn it on by adding line
IPython.Cell.options_default.cm_config.lineWrapping = true;
to the custom.js, but now this doesn't help. Javascript console shows that there no such parameters as lineWrapping (and lineNumbers also) for the cm_config.
Was this feature moved somewhere (or removed) or is this a problem with my installation?

[Carreau]

Well, it does work for me, but you are probably hitting a race condition as you are accessing the IPython global.

1. it is better to change module values by actually requiring them, to be sure they are loaded in custom,js:

require(['notebook/js/cell'], function(cell){
    cell.Cell.options_default.cm_config.lineWrapping = true
})

2. the better option woudl be to persist the config of line wrapping through the API (in flux):

IPython.notebook.get_cell(0).class_config.set('cm_config',{'lineWrapping':true})

@takluyver we don't seem to expose the class_config on the class which prevent to do require([codecell], function(modify config)). Am I mistaking? Should we allow that ?

[takluyver]

I don't think there's a good way to expose it on the class, because it relies on the ConfigSection instance created by main.js and passed in when instantiating Cell. In this case, class_config means 'config relevant to instances of this class', not 'config which is accessed on the class object'.

[minrk]

@takluyver @Carreau does this work if specified via the frontend-config API?

[Carreau]

I'm not sure I'll try to have a look, assigning to myself.

[Carreau]

@takluyver @Carreau does this work if specified via the frontend-config API?

IPython.notebook.get_selected_cell().class_config.set('cm_config',{'lineWrapping':true}) // or false

Yes it does work independently for markdown cells and code cell and end up as the following in config:

$ cat ~/.jupyter/nbconfig/notebook.json
{
  "MarkdownCell": {
    "cm_config": {
      "lineWrapping": false
    }
  },
  "CodeCell": {
    "cm_config": {
      "lineWrapping": false
    }
  },
}

[scharfmn]

IPython.notebook.get_selected_cell().class_config.set('cm_config',{'lineWrapping':true}) // or false

Does not work for me.
IPython 4.0.0
Jupyter 1.0.0
Python 2.7.10 |Anaconda 2.3.0 (x86_64)| (default, May 28 2015, 17:04:42)

 ~/.jupyter/nbconfig/notebook.json 

does not exist for me. I have

 ~/.jupyter/migrated

[Carreau]

Does not work for me.

Where did you do that ?
Did it gave errors?

• in the js console ?
• in the terminal ?

Did you reload the page ?
Did you restart the server ?

[scharfmn]

I put this

IPython.notebook.get_selected_cell().class_config.set('cm_config',{'lineWrapping':true}) // or false

into custom.js, as in the old version.

I did restart the server. What happened was: no wrapping, but then when I would try to execute cells that had long lines, I would get a python syntax error where there wasn't one before, with the interpreter giving the same kind of complaint as when one does a line-break without a \.

[Carreau]

No you need to execute that only once in the js console of the browser. Not in custom.js

[scharfmn]

Got it - thank you very much indeed.

[DieselAnalytics]

Is it possible to turn line wrapping on via the %config magic? If so could you please share the code to do so?

[JRKelly]

No you need to execute that only once in the js console of the browser. Not in custom.js

That browser console says it does not recognize Ipython. Not being familiar with that environment, how do I make it aware of IPython?

[takluyver]

• Ensure you are on a tab with a notebook open
• It is case sensitive
• At some point in the future, you may need to use Jupyter instead of IPython. For the moment, IPython still works, at least for me, as an alias.