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const std = @import("std");
const clap = @import("clap");
const debug = std.debug;
pub fn main() !void {
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 = [_]clap.Param(u8){
clap.Param(u8){
.id = 'h',
.names = clap.Names{ .short = 'h', .long = "help" },
},
clap.Param(u8){
.id = 'n',
.names = clap.Names{ .short = 'n', .long = "number" },
.takes_value = true,
},
clap.Param(u8){
.id = 'f',
.takes_value = true,
},
};
// 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 = clap.args.OsIterator.init(allocator);
defer iter.deinit();
// Consume the exe arg.
const exe = try iter.next();
// Finally we initialize our streaming parser.
var parser = clap.StreamingClap(u8, clap.args.OsIterator){
.params = params,
.iter = &iter,
};
// Because we use a streaming parser, we have to consume each argument parsed individually.
while (try parser.next()) |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 = {}\n", arg.value.?),
// arg.value == null, if arg.param.takes_value == false.
// Otherwise, arg.value is the value passed with the argument, such as "-a=10"
// or "-a 10".
'f' => debug.warn("{}\n", arg.value.?),
else => unreachable,
}
}
}
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