Add //go:generate directive to generated files

[utilyre]

This PR adds //go:generate directive to all generated files, enabling devs to re-generate that file with the go generate command.

The aim is to make it easier and more portable (in docker containers, etc) to re-generate *_templ.go files.

Appreciate your work btw :)

[joerdav]

I'm not sure I fully am on board with this feature just yet. What if the command used to generate is different from the default?

If the -include-version=false flag is provided for example, a subsequent go generate would undo that.

As a heads up we do have a bit of a contribution guide here: https://github.com/a-h/templ/blob/main/CONTRIBUTING.md#come-up-with-a-design-and-share-it

Mostly so that we can talk through ideas before they are implemented:

Before starting work on any major pull requests or code changes, start a discussion at https://github.com/a-h/templ/discussions or raise an issue.

We don't want you to spend time on a PR or feature that ultimately doesn't get merged because it doesn't fit with the project goals, or the design doesn't work for some reason.

[utilyre]

What if the command used to generate is different from the default?

I see, that would be an issue.

From what I've found, these are the options that can affect the output:

• -include-version
• -include-timestamp
• and potentially -cmd

@joerdav, can you please confirm that this list is exhaustive?

As a heads up we do have a bit of a contribution guide here: https://github.com/a-h/templ/blob/main/CONTRIBUTING.md#come-up-with-a-design-and-share-it

Mostly so that we can talk through ideas before they are implemented:

Before starting work on any major pull requests or code changes, start a discussion at https://github.com/a-h/templ/discussions or raise an issue.

We don't want you to spend time on a PR or feature that ultimately doesn't get merged because it doesn't fit with the project goals, or the design doesn't work for some reason.

Thanks for the heads up. I didn't think this was a major PR, that's why I didn't open any issues or discussions beforehand.