Add formatter

[adoebber]

I added automatic code formatting.

The readme already says "Automatic formatting", but I could not find the code for it. Am I missing something?

[5nord]

Yeah, experimental features such as formatting are hard to find. To use them you have to enable them manually in the settings.json file. Open the command palette (CTRL+SHIFT+P), search for "settings json" and then add the key you are interested in. In your case "ttcn3.experimental.format.enabled": true

Formatting is not enabled by default, because there are still some minor bugs. I plan to update the TTCN-3 parsers to the latest standards, this will be a good opportunity to fix and release the formatting feature.

Your pull request is very appreciated, however I won't merge it since I believe it won't be needed for much longer. Is this satisfactory?

[adoebber]

When I add that line to my settings.json, it is inactive (as in your screenshot) and VSCode says that no formatter is installed for ttcn3. I have tested that with the extension 0.8.0 from the marketplace. Furthermore if I search for the keyword "format" in this repository I cannot find the source code that registers a formatter. What am I overlooking?

[5nord]

I believe it is shown as inactive because experimental settings are not declared in the package.json manifest. But it still works with various vscode versions. I could not test the behaviour with Windows, though.

The code responsible for formatting is implemented in the language server that is used by this extensions: https://github.com/nokia/ntt/blob/v0.18.0/internal/lsp/configuration.go#L34-L54

It look a bit complicated because some editors do not have support for dynamic registration.

Do you have an idea what the problem could be?

[adoebber]

I have no idea what the problem is. VSCode just says, that there is no registered formatter when I do F1 -> "format document".

I was not aware of the dynamic registration of language servers. Since I cannot find the root cause of the problem, we would stick with this solution as a workaround. But I can understand, if you do not want to accept this PR.