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Adding section in README about env var cascade

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as well as moving a line back up where it belongs
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Dan Buch 2014-12-01 22:46:57 -05:00
parent dca23da84b
commit 1dce44d781
1 changed files with 14 additions and 1 deletions
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README.md
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@ -172,6 +172,8 @@ app.Flags = []cli.Flag {
}
```
That flag can then be set with `--lang spanish` or `-l spanish`. Note that giving two different forms of the same flag in the same command invocation is an error.
#### Values from the Environment
You can also have the default value set from the environment via `EnvVar`. e.g.
@ -187,7 +189,18 @@ app.Flags = []cli.Flag {
}
```
That flag can then be set with `--lang spanish` or `-l spanish`. Note that giving two different forms of the same flag in the same command invocation is an error.
The `EnvVar` may also be given as a comma-delimited "cascade", where the first environment variable that resolves is used as the default.
``` go
app.Flags = []cli.Flag {
cli.StringFlag{
Name: "lang, l",
Value: "english",
Usage: "language for the greeting",
EnvVar: "LEGACY_COMPAT_LANG,APP_LANG,LANG",
},
}
```
### Subcommands