Comments (4)
I've been working on a change to add "subcommand" support (see #2 ). Do you think that would be sufficient for what you're trying to do?
The user-interface would look slightly different. Instead of:
program --config CONFIGFILE
program --version
it would be:
program config CONFIGFILE
program version
In general, the format is:
program [global options...] SUB-COMMAND-NAME [sub-command-specific options and arguments]
This is similar to (and is based on) tools like git
where one top-level command (git) has multiple sub-commands (checkout, clone, push, reset, etc.) that take different options/arguments.
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Sub-command support seems like the cleaner approach than omission of required parameters. I would really love to see this, as right now most of my commands are optional (although at least one should be probably mandatory at any time).
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Sub-command support seems like the cleaner approach than omission of required parameters.
Subcommands are great, but I believe that it's not the right tool for the job here. Most programs don't work with subcommands and have instead some sort of "multiple usages" mindset, which I believe can be reasonably named the "anonymous subcommands" or "implicit subcommands" pattern.
I believe a lot of programs want usages like this:
Usage: program -h
Usage: program -v
Usage: program [standard args]
which corresponds to implicit "help", "version", and "default" subcommands.
There is actually one such implicit subcommand already implemented in kotlin-argparser: the help flag. It'd be nice to generalize this behaviour, maybe by using mutually exclusive option groups, that would act like anonymous subcommands.
A more simple implementation would be a special option type "standalone option" which would at least allow separating a single option from the rest, exactly like the help flag but for any custom option.
This feature would be very useful to implement for instance:
- a version flag
- a path to a configuration file that provides all mandatory arguments
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Regarding the version flag, then I've recently made this PR: #70
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Related Issues (20)
- Lazy parsing HOT 4
- Allow '.' as Separator in Options and Arguments HOT 2
- Hierarchical arguments
- Print help when catching SystemExitException HOT 1
- Is it possible to allow number parameters HOT 3
- Incorrect example main function in README.md HOT 1
- Readme example does not work HOT 3
- Exception in thread "main" com.xenomachina.argparser.ShowHelpException: Help was requested HOT 3
- InvalidArgumentName when argument name has trailing digit HOT 2
- Allow escaping strings HOT 6
- Include exception handling in force parse HOT 3
- Make `mainBody` behavior the default when parsing args HOT 3
- Help section titles should be capitalized HOT 2
- Interest in better support for sub parsers HOT 2
- Don't be too strict with positional and positionalList names
- Influcence exit behaviour
- better handling of long parameter names in the default formatter
- Is this project dead? HOT 1
- Support options of the form "-<number>" (hyphen immediately followed by a number)
- JCenter end of life
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