Port 'File Monitor' demo to Vala

[BharatAtbrat]

Added Vala code for File Monitor

Issues:

• File.replace_contents_async does not work well and inserts non-readable text inside the workbench.txt file, it also shows an additional error stating that I don't have permission to open the the file.
• Using File.replace_contents instead seems to work correctly.
• The Python demo also has the same effect and uses the async method.

Screengrab of the error attached:

Note: The Javascript demo works normally and it uses the replace_contents_async

• Using switch case gives a warning that causes the checks to fail, Js and Python demos both use switch case.

Let me know if there are any other issues with the code :)

[Diego-Ivan]

File.replace_contents_async does not work well and inserts non-readable text inside the workbench.txt file, it also shows an additional error stating that I don't have permission to open the the file

I tested the async method and it worked fine, and the error doesn't sound related to the async/not async method. Could you share the piece of code where the async method fails, please?

[BharatAtbrat]

File.replace_contents_async does not work well and inserts non-readable text inside the workbench.txt file, it also shows an additional error stating that I don't have permission to open the the file

I tested the async method and it worked fine, and the error doesn't sound related to the async/not async method. Could you share the piece of code where the async method fails, please?

This is the code:

    edit_file.clicked.connect (() => {
        string byte_string = buffer.text;
        uint8[] bytes = byte_string.data;
        file.replace_contents_async.begin (
                                           bytes, // contents
                                           null, // etag
                                           false, // make_backup
                                           FileCreateFlags.REPLACE_DESTINATION, // flags
                                           null, // new_etag
                                           null // cancellable
        );
    });

and a screengrab of what the text editor says:

2024-06-13.11-53-34.1.mp4

There is no warning/error in the console, and the operation is completed successfully.

[Diego-Ivan]

Move the handler to a separate async method and call file.replace_contents_async using yield. That worked for me, but I'm not sure why using .begin fails.

[BharatAtbrat]

Move the handler to a separate async method and call file.replace_contents_async using yield. That worked for me, but I'm not sure why using .begin fails.

@Diego-Ivan Works with your approach, added the commit! I am also not sure about why .begin doesn't work either