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examples: cli: more readable and informative program output (#6168)

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Lukas Neubert 2020-08-19 14:38:45 +02:00 committed by GitHub
parent 217f04e311
commit e6e1011e47
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1 changed files with 39 additions and 31 deletions
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70
examples/cli.v
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@ -5,57 +5,65 @@ import os
fn main() {
mut cmd := cli.Command{
name: 'cli',
description: 'An example of the cli library',
version: '1.0.0',
name: 'cli'
description: 'An example of the cli library.'
version: '1.0.0'
}
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,
name: 'greet'
description: 'Prints greeting in different languages.'
pre_execute: greet_pre_func
execute: greet_func
post_execute: greet_post_func
}
greet_cmd.add_flag(cli.Flag{
flag: .string,
required: true,
name: 'language',
abbrev: 'l',
description: 'Language of the message'
flag: .string
required: true
name: 'language'
abbrev: 'l'
description: 'Language of the message.'
})
greet_cmd.add_flag(cli.Flag{
flag: .int,
name: 'times',
value: '3',
description: 'Number of times the message gets printed'
flag: .int
name: 'times'
value: '3'
description: 'Number of times the message gets printed.'
})
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 {
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 {
match language {
'english' { println('Hello World') }
'german' { println('Hallo Welt') }
'dutch' { println('Hallo Wereld') }
else {
println('unsupported language')
break
'english' {
println('Hello World')
}
'german' {
println('Hallo Welt')
}
'dutch' {
println('Hallo Wereld')
}
else {
println('Unsupported language')
println('Supported are `englisch`, `german` and `dutch`.')
break
}
}
}
}
fn greet_pre_func(cmd cli.Command) {
println('This is a function running before the main function')
println('This is a function running before the main function.\n')
}
fn greet_post_func(cmd cli.Command) {
println('This is a function running after the main function')
println('\nThis is a function running after the main function.')
}