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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;
/// There are 4 args: help, version, copyright, and quiet
/// ArgType also contains longarg, which is how zeven checks if the arg
/// will be --
const ArgType = enum {
help,
version,
copyright,
quiet,
longarg,
badarg,
};
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" {
var test_int = try parseInt(i32, "-2", 10);
try expect(test_int == -2);
}
test "parseInt(i32, \"\", 10) != 0" {
var 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: ?ArgType = null;
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| {
f_arg = null;
if (arg[0] == '-') { // It's an arg!
f_arg = switch (arg[1]) {
'h' => ArgType.help,
'v' => ArgType.version,
'c' => ArgType.copyright,
'q' => ArgType.quiet,
'-' => ArgType.longarg,
'0'...'9' => null,
else => ArgType.badarg,
};
}
if (f_arg) |usearg| {
var realarg = usearg;
if (usearg == ArgType.longarg) {
if (eql(u8, arg, "--help")) {
realarg = ArgType.help;
} else if (eql(u8, arg, "--copyright")) {
realarg = ArgType.copyright;
} else if (eql(u8, arg, "--version")) {
realarg = ArgType.version;
} else if (eql(u8, arg, "--quiet")) {
realarg = ArgType.quiet;
} else {
realarg = ArgType.badarg;
}
}
_ = switch (realarg) {
ArgType.quiet => {
quiet = true;
continue;
},
ArgType.help => {
return print_arg(0);
},
ArgType.copyright => {
return print_arg(1);
},
ArgType.version => {
return print_arg(2);
},
else => {
return print_arg(255);
},
};
} 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("zeven copyright (c) Zachary Smith 2024\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;
},
};
}
|
