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