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const std = @import("std");
const argsWithAllocator = std.process.argsWithAllocator;
const eql = std.mem.eql;
const expect = std.testing.expect;
const parseInt = std.fmt.parseInt;
const print = std.debug.print;
const GeneralPurposeAllocator = std.heap.GeneralPurposeAllocator;
const VERSION = "1.0.0";
const LICENSE = "MIT";
test "@rem(-2, 2) == 0" {
try expect(@rem(-2, 2) == 0);
}
test "parseInt(i32, \"-2\", 10) == -2" {
const test_int = try parseInt(i32, "-2", 10);
try expect(test_int == -2);
}
test "parseInt(i32, \"\", 10) != 0" {
const test_int = try parseInt(i32, "-2", 10);
try expect(test_int != 0);
}
pub fn main() anyerror!u8 {
// This is an iterator for the provided args
var gpa = GeneralPurposeAllocator(.{}){};
const allocator = gpa.allocator();
defer _ = gpa.deinit();
var arg_it = try argsWithAllocator(allocator);
defer arg_it.deinit();
var f_arg: u5 = 0b0;
var f_int: i32 = undefined;
// This is whether or not to print the results
var quiet: bool = false;
// This is to check if a value has been provided
var value: bool = false;
// This skips the name of the binary
_ = arg_it.next();
while (arg_it.next()) |arg| {
if (arg[0] == '-') { // It's an arg!
if (arg[1] == '-') {
if (eql(u8, arg, "--help")) {
f_arg = 0b1;
} else if (eql(u8, arg, "--copyright")) {
f_arg = 0b10;
} else if (eql(u8, arg, "--version")) {
f_arg = 0b100;
} else if (eql(u8, arg, "--quiet")) {
f_arg = 0b1000;
} else {
f_arg = 0b11111;
}
} else {
f_arg = switch (arg[1]) {
'h' => f_arg | 0b1,
'c' => f_arg | 0b10,
'v' => f_arg | 0b100,
'q' => f_arg | 0b1000,
'0'...'9' => 0,
else => f_arg | 0b11111,
};
}
if (f_arg > 0) {
if (f_arg ^ 0b11111 == 0) {
return print_arg(255);
}
if (f_arg ^ 0b1 == 0) {
return print_arg(0);
}
if (f_arg ^ 0b10 == 0) {
return print_arg(1);
}
if (f_arg ^ 0b100 == 0) {
return print_arg(2);
}
if (f_arg ^ 0b1000 == 0) {
quiet = true;
}
} else {
value = true;
f_int = parseInt(i32, arg, 10) catch |err| return err;
}
} else { // Not an arg!
value = true;
f_int = parseInt(i32, arg, 10) catch |err| return err;
}
}
if (value) {
if (@rem(f_int, 2) == 0) {
if (!quiet) {
print("even\n", .{});
}
return 0;
} else {
if (!quiet) {
print("odd\n", .{});
}
return 1;
}
} else {
print("No value was provided!\n", .{});
}
return 1;
}
pub fn print_arg(err: u8) !u8 {
return switch (err) {
0 => {
print("zeven: a binary by ZachIR to check if ", .{});
print("a number is even or odd\n", .{});
print("\tzeven [-hcv]\n", .{});
print("\tzeven [--help]\n", .{});
print("\tzeven [--copyright]\n", .{});
print("\tzeven [--version]\n", .{});
print("\tzeven [-q] [--quiet] NUMBER\n", .{});
print("\t-h: prints this help message\n", .{});
print("\t-c: prints the copyright information\n", .{});
print("\t-v: prints the version\n", .{});
print("\t-q: just uses error codes, no text\n", .{});
return 0;
},
1 => {
print("copyright (c) 2025 ZachIR\n", .{});
print("zeven is Free software under the {s} ", .{LICENSE});
print("license, and is provided without ", .{});
print("warranty of any kind.\n", .{});
return 0;
},
2 => {
print("zeven version {s}, 2024\n", .{VERSION});
return 0;
},
else => {
print("A bad argument was provided!\n", .{});
return 1;
},
};
}
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