How to listen event on specific file in Visual Studio Code?

Question

I am new to visual studio code API.

I would like to listen some event like onSave , onClose etc...

I am currently using this API.
But I think this is vary expensive like this. When you only need to listen event for only a specific file.

let { workspace } = require("vscode");

module.exports = {
    activate(ctx) {
        ctx.subscriptions.push(
            workspace.onDidSaveTextDocument(({ fileName, version }) => {
                
            })
        )
    },
    deactivate() {}
};

"I think this is vary expensive like this", you'd better give some proof. — Lex Li
– Lex Li, Commented Nov 9, 2020 at 1:11
Every time If I save any file then it will fire this function. then check something if true then update else do something...Its take some CPU computation right ? So its expensive — Stone
– Stone, Commented Nov 9, 2020 at 17:48
Its like watch all...check then do something...I want something like watch one! ...check then do something...so my code only run if a specific file change — Stone
– Stone, Commented Nov 9, 2020 at 17:52

Stone · Accepted Answer · 2020-11-09 18:08:46Z

1

Not a great solution .But worked for me. Still Though is there any other way,The better way?...

My solution is...

let onSaveCleaner = workspace.onDidSaveTextDocument((e) => {
    // watch for all file save event ... yuck!
});

let onCloseCleaner = workspace.onDidCloseTextDocument(({ fileName, languageId }) => {
    // some condition like once `specific` file closed 
    if (languageId == "python" && fileName == "...") {
        onSaveCleaner.dispose()
        onCloseCleaner.dispose()
    }
});

By doing that We only run expensive code when file is not closed! Once the file closed...Destroy everything!

answered Nov 9, 2020 at 18:08

Stone

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2 Comments

Stone Over a year ago

I think there is better API.Which I don't know...for watching specific file...not all file!

ThomasReggi Over a year ago

This does not work for notebooks.

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