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const std = @import("std");
const clap = @import("clap");
const debug = std.debug;
pub fn main() !void {
const stdout_file = try std.io.getStdOut();
var stdout_out_stream = stdout_file.outStream();
const stdout = &stdout_out_stream.stream;
var direct_allocator = std.heap.DirectAllocator.init();
const allocator = &direct_allocator.allocator;
defer direct_allocator.deinit();
// First we specify what parameters our program can take.
const params = comptime []clap.Param([]const u8){
clap.Param([]const u8).flag(
"Display this help and exit.",
clap.Names.prefix("help")
),
clap.Param([]const u8).option(
"An option parameter, which takes a value.",
clap.Names.prefix("number"),
),
clap.Param([]const u8).positional(""),
};
// 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 os_iter = clap.args.OsIterator.init(allocator);
const iter = &os_iter.iter;
defer os_iter.deinit();
// Consume the exe arg.
const exe = try iter.next();
// Finally we can parse the arguments
var args = try clap.ComptimeClap([]const u8, params).parse(allocator, clap.args.OsIterator.Error, iter);
defer args.deinit();
// clap.help is a function that can print a simple help message, given a
// slice of Param([]const u8). There is also a helpEx, which can print a
// help message for any Param, but it is more verbose to call.
if (args.flag("--help"))
return try clap.help(stdout, params);
if (args.option("--number")) |n|
debug.warn("--number = {}\n", n);
for (args.positionals()) |pos|
debug.warn("{}\n", pos);
}
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