print("content") outside of setup/draw invokes print dialog. possible to catch with FES?

[alexdmiller]

Most appropriate sub-area of p5.js?

• Color
• Core/Environment/Rendering
• Data
• Events
• Image
• IO
• Math
• Typography
• Utilities
• WebGL
• Other (specify if possible)

Details about the bug:

• p5.js version: 0.10.2
• Web browser and version: Firefox 72.0.2
• Operating System: MacOS 10.14 (Mojave)
• Steps to reproduce this:

The following code causes the print dialog to appear in Firefox (using editor.p5js.org).

print("Hello world!")

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[stalgiag]

Hm odd! I am not able to recreate on Mac 10.15.2 using the online editor and Firefox 72.0.2. This sketch just prints the text in the console for me:

function setup() {
  print("Hello world!")
}

[alexdmiller]

Ah, I'm realizing my mistake. I tried to use the print function all by itself, outside of the setup function. Coming from Java Processing, I expected this to work, and the reference examples for print don't include a setup or draw function.

I realize my case is probably a bit unusual, but it might be worth updating the documentation?

[limzykenneth]

I don't think this is something we can specifically document just for print() as most functions in p5.js cannot be used outside of setup() or draw() before setup() or draw() is called. However, this behaviour should be caught by the friendly error system, not sure if it would be impossible to catch print() though.

[debajitdeb11]

@limzykenneth Can I work on this issue?

[limzykenneth]

@debajitdeb11 Sure, do have a look at it. I'm not sure how would the FES detect print("something") is being used before initialization though as unlike the other functions, print() exist on the global scope. Let us know what you find, thanks!

[debajitdeb11]

Where is the source code for the online editor is located in the source file?

[limzykenneth]

The source code for the web editor is located in another repo but why do you need the source code for it for this issue?

[outofambit]

i think this is a great place for FES. if someone is interested in working on it i’m also happy to answer questions, code review, whatever!

[akshay-99]

@debajitdeb11 if you are still working on this maybe window.onbeforeprint can help you? I am just guessing here but maybe using something like a check for _setupDone or similar inside it to call report() to trigger a friendly warning message?