example/usage.zig


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const clap = @import("clap");
const std = @import("std");

pub fn main() !void {
    const params = comptime [_]clap.Param(clap.Help){
        clap.untyped.parseParam("-h, --help       Display this help and exit.") catch unreachable,
        clap.untyped.parseParam("-v, --version    Output version information and exit.") catch unreachable,
        clap.untyped.parseParam("    --value <N>  An option parameter, which takes a value.") catch unreachable,
    };

    var res = try clap.untyped.parse(clap.Help, &params, .{});
    defer res.deinit();

    // clap.usage is a function that can print a simple usage message, given a
    // slice of Param(Help). There is also a usageEx, which can print a
    // usage message for any Param, but it is more verbose to call.
    if (res.args.help)
        return clap.usage(std.io.getStdErr().writer(), &params);
}