Custom abort behaviour

[alexreg]

Currently, when Ctrl+C is pressed, a Click program "aborts" (printing "Aborted!") and immediately exits. I would like to be able to customise this behaviour, principally for the purpose of executing "teardown" code before the app exits, but it might also be nice to be able to customise the message to conform with a particular message style.

As far as I'm aware, there is no other way to solve this without turning off exception handling entirely, which is far from ideal.

[roblight]

This really caught me for a surprise. I'm using Typer for a CLI app and "Aborted!" message showed up on keyboard interrupt. No easy way to change or silence it appears.

[alexreg]

@roblight Yeah, it's confusing. I originally thought the program had crashed with some memory issue (SIGABRT). I ended up doing exception handling manually in my case, in order to override this.

[davidism]

It sounds like what you both are asking for is just to not print the "Aborted" message, not to be able to customize it. As to teardown, you should use the standard atexit module to accomplish that, it's not specific to Click.

[alexreg]

@davidism I'm not sure if existing signal handlers can be removed using atexit, but that seems a bit hacky in any case.

[davidism]

Using the atexit module to do something at exit is not a hack, it's the intended use case of a standard module.

Perhaps you're looking for context managers? https://click.palletsprojects.com/en/8.0.x/advanced/#managing-resources

[alexreg]

Would I be able to remove the default exit handle in that case? The one that click provides.