Version command

[jannis-baum]

Close #111

[jannis-baum]

@tuurep sorry if I am being too annoying with changes/new features lately, it'll tone down a lot again soon🙈

Here I added a -v/--version to viv (by adding it to vivify-server) which I think is an important feature we have been missing.

For this to work I had to make some changes to viv that allow the things that vivify-server prints during startup to be output to the user through viv. This enables us to do all argument parsing (other than --help) in vivify-server and handle the version number there and also print an error if a requested file doesn't exist. Might also be useful for future additions.

For the releases the version number will be the same as the tag names, e.g. v0.1.6. For local builds in between it will be {previous_tag}-{number_of_commits_since}-g{hash_of_head_commit}[-dirty] with -dirty being added in case there are uncommitted changes, e.g. v0.1.6-120-g05d074c for the last commit I made here. Or, if VIV_VERSION is set during make it will be that. ¹

Would you mind doing a quick check and seeing if the building and getting the version number works for you as well? I would like to merge this as the final thing before v0.2.0. If it's too much work also let me know, no worries at all!

Footnotes

1. Not that relevant, but just for completeness: For non-release builds that the CI makes it will be {PR-number}/merge, e.g. 112/merge here, and for the ones that happen on main simply main. Adding the full description like for local builds would require checking out the full repo with all the history which might be a bit unnecessary ↩

[tuurep]

Yeah don't worry, it's been cool feeling productive on this project :D

The new flag works just fine:

$ viv --version
vivify-server v0.1.6-120-g05d074c
$ viv -v
vivify-server v0.1.6-120-g05d074c

[tuurep]

$ VIV_VERSION="trolol-edition" make install
...
$ viv --version
vivify-server trolol-edition