envhelpers

func Expand ¶

func Expand(s string, mapping func(string) string) string

Expand replaces ${var} (and only that) in the string based on the mapping function. This signature is identical to the one in the Go standard library, but has a more restrictive scope with less ambiguity. The value inside ${} must match \w+ (see regexp.MatchString).

A special form of environment variable syntax is supported to allow for removing surrounding quoutes (both single and double), useful to setting numeric values in TOML/JSON config files etc. Use the "@U" suffix to signal unquoting, e.g. `"${myvar@U}"` or `'${myvar@U}'`. Note that when using the "@U" suffix, the variable expression needs to be surrounded by quoutes.

func SetEnvVars ¶

func SetEnvVars(oldVars *[]string, keyValues ...string)

SetEnvVars sets vars on the form key=value in the oldVars slice.

func SplitEnvVar ¶

func SplitEnvVar(v string) (string, string)

SplitEnvVar splits an env var into key and value.