bitbucket.org/heapsapp/envflag

envflag

Package envflag is a Go package that exposes environment variables for all the flags within a flag.FlagSet.

It came out of a response to a Reddit post by jalquiza about their envy package.

This package differs from that one in several ways:

• the usage is slightly different, it is not a drop in replacement

• it can be used with any flag.FlagSet, not just flag.CommandLine

• it tries harder (compared to the original envy) to avoid effecting the reported argument defaults or the results of functions/methods such as flag.Visit and flag.NFlag

• if there are any errors parsing environment variables (e.g. a string value where an interger value is expected) the first such encountered is returned

See the GoDoc documentation for complete examples but basically you can just replace the call to:

    flag.Parse()

with:

    envflag.Parse("PROGNAME", true)

to have envirment variables such as PROGNAME_PORT be used for the program's -port argument when no such argument is provided.

Copyright and License

This package is Copyright 2017, Dave Chapeskie.

You are free to do with it anything you want, with the sole exception being you cannot replicate this package and claim you wrote it.