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v/vlib/cli/README.md

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## Description:
`cli` is a command line option parser, that supports
declarative subcommands, each having separate set of options.
See also the `flag` module, for a simpler command line option parser,
that supports only options.
## Example:
```v
module main
import os
import cli
fn main() {
mut app := cli.Command{
name: 'example-app'
description: 'example-app'
execute: fn (cmd cli.Command) ? {
println('hello app')
return
}
commands: [
cli.Command{
name: 'sub'
execute: fn (cmd cli.Command) ? {
println('hello subcommand')
return
}
},
]
}
app.setup()
app.parse(os.args)
}
```