Hydrogen: Idea/Question: Highlight current code cell

[Foucl]

One of the few things I miss after the migration Matlab->RStudio->Spyder->Atom/Hydrogen is the possibility to easily see in what cell the cursor currently is (and thus what will happen on run-cell):

This would probably be quite easy to implement in style.less if I am not mistaken.
Does anyone know of a simple way to access the region between the previous and current breakpoint?

---

This has been added to the Hydrogen Wiki Plugins and the Hydrogen Wiki Features. If you close this issue please remove it from the Hydrogen Wiki.

[BenRussert]

This would probably be quite easy to implement in style.less if I am not mistaken.
Does anyone know of a simple way to access the region between the previous and current breakpoint?

When a run-cell command is called we use a regular expression based function to determine what code should run depending on the user's current cursor position. Since this only occurs as needed there wont be a selector you could use to access via styles.less as of now.

@t9md Based on some of your recent work I wonder if you have any thoughts on how this could be implemented?

[t9md]

The idea I can come up with is

• We write output in createResultBubble(and _createResultBubble) , in spite of name it also render global output(?)
• So make _createResultBubble accept cell(= Range) instead of current code. since we can not determine whether we should highlight or not until final code evaluation phase.

Then just highlight range(=mark range && decorate that marker) with class hydrogen-cell,use style by CSS.
This cell decoration must be deleted as same timing of destroying bubble maybe.

[Foucl]

thank you! I suppose it's not as easy. I suppose it's harder than I thought and the suggested solution would rely on the cell actually being run.

If no one else is interested, I should probably close this issue and avoid cluttering the repo? Maybe it's an idea for a plugin. Before I try that, I'd like to give another, only somewhat related thought I had a shot (a plugin that allows execution of the current python function if the cursor is inside one).

[BenRussert]

@Foucl I think we should keep this open since implementing as a plugin or in the core package will take some work and discussion. I try to close issues if there is nothing left to do on them (not the case here).

[BenRussert]

@Foucl I have a working plugin concept for this under development (contributions welcome!).

@t9md you might be interested in this plugin as well, as it is more or less the implementation you describe above.

I hope to make the styling better among other things, but you can see the basic idea:

[Jogala]

@BenRussert the link to your plugin is unfortunately dead. What is new address?

I would love such a plugin!

[jhabriel]

I've created a plugin that separates the cells with a horizontal line. It's not currently highlighting though but is useful to identify different cells.

https://atom.io/packages/hydrogen-cell-separator

Cheers,

JV

[wadethestealth]

@jhabriel I wish you would have told us in some other form because this may have become buried. Anyways, I'll add your plugin to our list ❤️ 👍