v0.6.0

What's New

• Added new Arg.setValuePlaceholder() to display option's value placeholder in help message. For e.x.: -t, --time=<SECS>.
• Added new .help_on_empty_args property for a command which, when set, a help message is automatically displayed when arguments are not provided.

Before:

if (!matches.containsArgs()) {
    try app.displayHelp();
    return;
}

if (matches.subcommandMatches("update")) |update_cmd_matches| {
    if (!update_cmd_matches.containsArgs()) {
        try app.displaySubcommandHelp();
        return;
    }
}

After:

var app = App.init(allocator, "myls", "My custom ls");
defer app.deinit();

var myls = app.rootCommand();
myls.setProperty(.help_on_empty_args);

var update_cmd = app.createCommand("update", "Update the app or check for new updates");
update_cmd.setProperty(.help_on_empty_args);

try myls.addSubcommand(update_cmd);

const matches = try myls.parseProcess();

// --snip--

Note that App.displayHelp() and App.displaySubcommandHelp() are still available.

• Improved error messages.
• Polished help message.

What's Changed

• App.parseProcess() and App.parseFrom() now returns ArgMatches directly instead of *const ArgMatches.
• Add const qualifier in Command.addArgs and Command.addSubcommands. By @monomycelium in #21
• Fix: Arg.multiValuesOption behavior when single value is provided by @fardragon in #26
• Fix: compiler crash during zig build test by @fardragon in 8f53fcb
• Fix: subcommands with no values will never match #23. With this change, ArgMatches.subcommandMatches() now returns empty matches for any subcommand that doesn't take argument.
• Fix: disable printing error messages during test.

Internal Improvements

• The parser implementation has been polished to make it easier to contribute by adding inline comments where necessary.
• Error handling has been enhanced.
• Improved the help message writer's implementation.
• Overall documentation is improved.

New Contributors

• @monomycelium made their first contribution in #21
• @fardragon made their first contribution in #26

Full Changelog: v0.5.1...v0.6.0