Use specific error status for missing .envrc

[Profpatsch]

For editor integration like https://github.com/wbolster/emacs-direnv to be able to provide a nice user interface, they need to be able to discern the different failure states, like a missing .envrc and possibly others.

Of course they could match on the error message, but a nicer way is to have more specific failure status codes, e.g. “missing .envrc” would get status 2.

[zimbatm]

Happy to get a PR that classifies all the possible error types

[curiousleo]

Starting point:

direnv/main.go

Line 19 in f697949

os.Exit(1)

[zimbatm]

Basically you would introduce an type ErrorWithStatus struct { Err error, ExitStatus int } and then type-switch on that during exit. Maybe a table of exit statuses could also be built.

[curiousleo]

This could be used as a starting point for the actual exit code numbers: https://www.freebsd.org/cgi/man.cgi?query=sysexits&apropos=0&sektion=0&manpath=FreeBSD+11.2-stable&arch=default&format=html

[zimbatm]

Now all we need is for somebody to actually implement it :p