Initial commit

Adds in zeven version 1.0.0

4 files changed, 242 insertions, 0 deletions

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e38857d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,19 @@
+Copyright (c) 2024 Zachary Smith
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..01e4dfd
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,4 @@
+ZIG_OPTS := -Doptimize=ReleaseSmall
+
+all: src/main.zig
+	zig build ${ZIG_OPTS}
diff --git a/build.zig b/build.zig
new file mode 100644
index 0000000..7d73be1
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,70 @@
+const std = @import("std");
+
+// Although this function looks imperative, note that its job is to
+// declaratively construct a build graph that will be executed by an external
+// runner.
+pub fn build(b: *std.Build) void {
+    // Standard target options allows the person running `zig build` to choose
+    // what target to build for. Here we do not override the defaults, which
+    // means any target is allowed, and the default is native. Other options
+    // for restricting supported target set are available.
+    const target = b.standardTargetOptions(.{});
+
+    // Standard optimization options allow the person running `zig build` to select
+    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
+    // set a preferred release mode, allowing the user to decide how to optimize.
+    const optimize = b.standardOptimizeOption(.{});
+
+    const exe = b.addExecutable(.{
+        .name = "zeven",
+        // In this case the main source file is merely a path, however, in more
+        // complicated build scripts, this could be a generated file.
+        .root_source_file = .{ .path = "src/main.zig" },
+        .target = target,
+        .optimize = optimize,
+    });
+
+    // This declares intent for the executable to be installed into the
+    // standard location when the user invokes the "install" step (the default
+    // step when running `zig build`).
+    b.installArtifact(exe);
+
+    // This *creates* a Run step in the build graph, to be executed when another
+    // step is evaluated that depends on it. The next line below will establish
+    // such a dependency.
+    const run_cmd = b.addRunArtifact(exe);
+
+    // By making the run step depend on the install step, it will be run from the
+    // installation directory rather than directly from within the cache directory.
+    // This is not necessary, however, if the application depends on other installed
+    // files, this ensures they will be present and in the expected location.
+    run_cmd.step.dependOn(b.getInstallStep());
+
+    // This allows the user to pass arguments to the application in the build
+    // command itself, like this: `zig build run -- arg1 arg2 etc`
+    if (b.args) |args| {
+        run_cmd.addArgs(args);
+    }
+
+    // This creates a build step. It will be visible in the `zig build --help` menu,
+    // and can be selected like this: `zig build run`
+    // This will evaluate the `run` step rather than the default, which is "install".
+    const run_step = b.step("run", "Run the app");
+    run_step.dependOn(&run_cmd.step);
+
+    // Creates a step for unit testing. This only builds the test executable
+    // but does not run it.
+    const unit_tests = b.addTest(.{
+        .root_source_file = .{ .path = "src/main.zig" },
+        .target = target,
+        .optimize = optimize,
+    });
+
+    const run_unit_tests = b.addRunArtifact(unit_tests);
+
+    // Similar to creating the run step earlier, this exposes a `test` step to
+    // the `zig build --help` menu, providing a way for the user to request
+    // running the unit tests.
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&run_unit_tests.step);
+}
diff --git a/src/main.zig b/src/main.zig
new file mode 100644
index 0000000..e987bb0
--- /dev/null
+++ b/src/main.zig
@@ -0,0 +1,149 @@
+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 simple binary to check if a number ", .{});
+            print("is even or odd\n", .{});
+            print("\tzeven [-cvh]\n", .{});
+            print("\tzeven [--help]\n", .{});
+            print("\tzeven [--copyright]\n", .{});
+            print("\tzeven [--version]\n", .{});
+            print("\tzeven [-q] [--quiet] X\n", .{});
+            return 0;
+        },
+        1 => {
+            print("zeven is Free software under the {s} license.\n", .{LICENSE});
+            print("zeven copyright (c) Zachary Smith 2024\n", .{});
+            return 0;
+        },
+        2 => {
+            print("zeven version {s}\n", .{VERSION});
+            return 0;
+        },
+        else => {
+            print("Error!\n", .{});
+            return 1;
+        },
+    };
+}