example/usage.zig


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pub fn main() !void {
    var gpa_state = std.heap.DebugAllocator(.{}){};
    const gpa = gpa_state.allocator();
    defer _ = gpa_state.deinit();

    var threaded: std.Io.Threaded = .init_single_threaded;
    const io: std.Io = threaded.io();

    const params = comptime clap.parseParamsComptime(
        \\-h, --help         Display this help and exit.
        \\-v, --version      Output version information and exit.
        \\    --value <str>  An option parameter, which takes a value.
        \\
    );

    var res = try clap.parse(clap.Help, &params, clap.parsers.default, .{ .allocator = gpa });
    defer res.deinit();

    // `clap.usageToFile` is a function that can print a simple usage string. It can print any
    // `Param` where `Id` has a `value` method (`Param(Help)` is one such parameter).
    if (res.args.help != 0)
        return clap.usageToFile(io, .stdout(), clap.Help, &params);
}

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