v/examples/cli.v

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module main
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import cli
import os
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fn main() {
mut cmd := cli.Command{
name: 'cli'
description: 'An example of the cli library.'
version: '1.0.0'
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}
mut greet_cmd := cli.Command{
name: 'greet'
description: 'Prints greeting in different languages.'
pre_execute: greet_pre_func
execute: greet_func
post_execute: greet_post_func
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}
greet_cmd.add_flag(cli.Flag{
flag: .string
required: true
name: 'language'
abbrev: 'l'
description: 'Language of the message.'
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})
greet_cmd.add_flag(cli.Flag{
flag: .int
name: 'times'
value: '3'
description: 'Number of times the message gets printed.'
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})
cmd.add_command(greet_cmd)
cmd.parse(os.args)
}
fn greet_func(cmd cli.Command) {
language := cmd.flags.get_string('language') or {
panic("Failed to get \'language\' flag: $err")
}
times := cmd.flags.get_int('times') or {
panic("Failed to get \'times\' flag: $err")
}
for _ in 0 .. times {
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match language {
'english' {
println('Hello World')
}
'german' {
println('Hallo Welt')
}
'dutch' {
println('Hallo Wereld')
}
else {
println('Unsupported language')
println('Supported are `englisch`, `german` and `dutch`.')
break
}
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}
}
}
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fn greet_pre_func(cmd cli.Command) {
println('This is a function running before the main function.\n')
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}
fn greet_post_func(cmd cli.Command) {
println('\nThis is a function running after the main function.')
}