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[#1428] DOC: make a note about subcommands with the same name as a de… #1433

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25 changes: 25 additions & 0 deletions docs/index.adoc
Original file line number Diff line number Diff line change
Expand Up @@ -8595,6 +8595,31 @@ class Git : Runnable {
By default, the synopsis of a command with subcommands shows a trailing `[COMMAND]`, indicating that a subcommand can optionally be specified.
To show that the subcommand is mandatory, use the `synopsisSubcommandLabel` attribute to replace this string with `COMMAND` (without the `[` and `]` brackets).

=== Subcommands and default values

There are some scenarios where picocli can not parse an option with a default value which is the same as a subcommand name. To work around this, you can parse the option yourself using <<Custom Parameter Processing,`IParameterConsumer`>>. A simple implementation is shown below. See https://github.com/remkop/picocli/issues/1428[this issue] for more details.


.Kotlin
[source,kotlin,role="secondary"]
----
class MyParameterConsumer : CommandLine.IParameterConsumer {
override fun consumeParameters(
args: Stack<String>,
argSpec: CommandLine.Model.ArgSpec,
commandSpec: CommandLine.Model.CommandSpec
) {
if (args.isEmpty()) {
throw CommandLine.ParameterException(
commandSpec.commandLine(),
"Missing required parameter for option " +
(argSpec as CommandLine.Model.OptionSpec).longestName()
)
}
argSpec.setValue(args.pop());
}
}
----

== Reuse
You may find yourself defining the same options, parameters or command attributes in many command line applications.
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