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

const debug = std.debug;
const io = std.io;

pub fn main() !void {
    // First we specify what parameters our program can take.
    // We can use `parseParam` to parse a string to a `Param(Help)`
    const params = comptime [_]clap.Param(clap.Help){
        clap.parseParam("-h, --help             Display this help and exit.              ") catch unreachable,
        clap.parseParam("-n, --number <NUM>     An option parameter, which takes a value.") catch unreachable,
        clap.parseParam("-s, --string <STR>...  An option parameter which can be specified multiple times.") catch unreachable,
        clap.parseParam("<POS>...") catch unreachable,
    };

    // Initalize our diagnostics, which can be used for reporting useful errors.
    // This is optional. You can also pass `.{}` to `clap.parse` if you don't
    // care about the extra information `Diagnostics` provides.
    var diag = clap.Diagnostic{};
    var args = clap.parse(clap.Help, &params, .{ .diagnostic = &diag }) catch |err| {
        // Report useful error and exit
        diag.report(io.getStdErr().writer(), err) catch {};
        return err;
    };
    defer args.deinit();

    if (args.flag("--help"))
        debug.warn("--help\n", .{});
    if (args.option("--number")) |n|
        debug.warn("--number = {s}\n", .{n});
    for (args.options("--string")) |s|
        debug.warn("--string = {s}\n", .{s});
    for (args.positionals()) |pos|
        debug.warn("{s}\n", .{pos});
}

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

pub fn main() !void {
    const params = comptime [_]clap.Param(clap.Help){
        clap.parseParam("-h, --help  Display this help and exit.") catch unreachable,
    };

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

    _ = args.flag("--helps");
}

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

const debug = std.debug;
const io = std.io;

pub fn main() !void {
    const allocator = std.heap.page_allocator;

    // First we specify what parameters our program can take.
    const params = [_]clap.Param(u8){
        .{
            .id = 'h',
            .names = .{ .short = 'h', .long = "help" },
        },
        .{
            .id = 'n',
            .names = .{ .short = 'n', .long = "number" },
            .takes_value = .one,
        },
        .{ .id = 'f', .takes_value = .one },
    };

    // We then initialize an argument iterator. We will use the OsIterator as it nicely
    // wraps iterating over arguments the most efficient way on each os.
    var iter = try clap.args.OsIterator.init(allocator);
    defer iter.deinit();

    // Initalize our diagnostics, which can be used for reporting useful errors.
    // This is optional. You can also leave the `diagnostic` field unset if you
    // don't care about the extra information `Diagnostic` provides.
    var diag = clap.Diagnostic{};
    var parser = clap.StreamingClap(u8, clap.args.OsIterator){
        .params = &params,
        .iter = &iter,
        .diagnostic = &diag,
    };

    // Because we use a streaming parser, we have to consume each argument parsed individually.
    while (parser.next() catch |err| {
        // Report useful error and exit
        diag.report(io.getStdErr().writer(), err) catch {};
        return err;
    }) |arg| {
        // arg.param will point to the parameter which matched the argument.
        switch (arg.param.id) {
            'h' => debug.warn("Help!\n", .{}),
            'n' => debug.warn("--number = {s}\n", .{arg.value.?}),

            // arg.value == null, if arg.param.takes_value == .none.
            // Otherwise, arg.value is the value passed with the argument, such as "-a=10"
            // or "-a 10".
            'f' => debug.warn("{s}\n", .{arg.value.?}),
            else => unreachable,
        }
    }
}

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

pub fn main() !void {
    // clap.help is a function that can print a simple help message, given a
    // slice of Param(Help). There is also a helpEx, which can print a
    // help message for any Param, but it is more verbose to call.
    try clap.help(
        std.io.getStdErr().writer(),
        comptime &.{
            clap.parseParam("-h, --help     Display this help and exit.         ") catch unreachable,
            clap.parseParam("-v, --version  Output version information and exit.") catch unreachable,
        },
    );
}

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

pub fn main() !void {
    // 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.
    try clap.usage(
        std.io.getStdErr().writer(),
        comptime &.{
            clap.parseParam("-h, --help       Display this help and exit.              ") catch unreachable,
            clap.parseParam("-v, --version    Output version information and exit.     ") catch unreachable,
            clap.parseParam("    --value <N>  An option parameter, which takes a value.") catch unreachable,
        },
    );
}