Capacity to add (mix in) multiple command objects #144
Description
I just started using Picocli and what I understand (I may wrong) you can have only a single command to describe main options. I mean
CommandLine.populateCommand(new Example(), args);or
new CommandLine(new Example());Only take single command.
It could be cool to pass collections of command that will be merged. For example
CommandLine c = new CommandLine();
c.addCommand(new Generic());
c.addCommand(new Example());Thus it will allow user to split their command options into multiple files (without using inheritance, here the concept is more composition).
with
class Generic {
@Option(names = {"-V", "--version"}, help = true, description = "Prints version information and exits")
private boolean versionRequested;
@Option(names = {"-h", "--help"}, help = true, description = "Prints this help message and exits")
private boolean helpRequested;
}and
class Example {
@Option(names = {"-f", "--foo"})
private boolean foo;
@Option(names = {"-b", "--bar"})
private boolean bar;
@Parameters(arity = "1..*", paramLabel = "FILE", description = "File(s) to process.")
private File[] inputFiles;
}At end result should be similar than merging both command like
class VirtualMergedResult {
@Option(names = {"-V", "--version"}, help = true, description = "Prints version information and exits")
private boolean versionRequested;
@Option(names = {"-h", "--help"}, help = true, description = "Prints this help message and exits")
private boolean helpRequested;
@Option(names = {"-f", "--foo"})
private boolean foo;
@Option(names = {"-b", "--bar"})
private boolean bar;
@Parameters(arity = "1..*", paramLabel = "FILE", description = "File(s) to process.")
private File[] inputFiles;
}So yes Example could extends Generic but if we need more composition it will be hell :)
Feature is similar to JCommander .addObject(...) that can be chained and thus add multiple commands (objects in JCommander words)
But it's maybe to far from current architecture, I can understand that is not yet implementable or acceptable