initial commit

.gitignore

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+zig-cache
+zig-out

build.zig

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+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 lib = b.addStaticLibrary(.{
+        .name = "zig-totp",
+        // 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 = b.path("src/root.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    // This declares intent for the library to be installed into the standard
+    // location when the user invokes the "install" step (the default step when
+    // running `zig build`).
+    b.installArtifact(lib);
+
+    const exe = b.addExecutable(.{
+        .name = "zig-totp",
+        .root_source_file = b.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 lib_unit_tests = b.addTest(.{
+        .root_source_file = b.path("src/root.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests);
+
+    const exe_unit_tests = b.addTest(.{
+        .root_source_file = b.path("src/main.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    const run_exe_unit_tests = b.addRunArtifact(exe_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_lib_unit_tests.step);
+    test_step.dependOn(&run_exe_unit_tests.step);
+}

build.zig.zon

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+.{
+    .name = "zig-totp",
+    // This is a [Semantic Version](https://semver.org/).
+    // In a future version of Zig it will be used for package deduplication.
+    .version = "0.0.0",
+
+    // This field is optional.
+    // This is currently advisory only; Zig does not yet do anything
+    // with this value.
+    //.minimum_zig_version = "0.11.0",
+
+    // This field is optional.
+    // Each dependency must either provide a `url` and `hash`, or a `path`.
+    // `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
+    // Once all dependencies are fetched, `zig build` no longer requires
+    // internet connectivity.
+    .dependencies = .{
+        // See `zig fetch --save <url>` for a command-line interface for adding dependencies.
+        //.example = .{
+        //    // When updating this field to a new URL, be sure to delete the corresponding
+        //    // `hash`, otherwise you are communicating that you expect to find the old hash at
+        //    // the new URL.
+        //    .url = "https://example.com/foo.tar.gz",
+        //
+        //    // This is computed from the file contents of the directory of files that is
+        //    // obtained after fetching `url` and applying the inclusion rules given by
+        //    // `paths`.
+        //    //
+        //    // This field is the source of truth; packages do not come from a `url`; they
+        //    // come from a `hash`. `url` is just one of many possible mirrors for how to
+        //    // obtain a package matching this `hash`.
+        //    //
+        //    // Uses the [multihash](https://multiformats.io/multihash/) format.
+        //    .hash = "...",
+        //
+        //    // When this is provided, the package is found in a directory relative to the
+        //    // build root. In this case the package's hash is irrelevant and therefore not
+        //    // computed. This field and `url` are mutually exclusive.
+        //    .path = "foo",
+
+        //    // When this is set to `true`, a package is declared to be lazily
+        //    // fetched. This makes the dependency only get fetched if it is
+        //    // actually used.
+        //    .lazy = false,
+        //},
+    },
+
+    // Specifies the set of files and directories that are included in this package.
+    // Only files and directories listed here are included in the `hash` that
+    // is computed for this package.
+    // Paths are relative to the build root. Use the empty string (`""`) to refer to
+    // the build root itself.
+    // A directory listed here means that all files within, recursively, are included.
+    .paths = .{
+        // This makes *all* files, recursively, included in this package. It is generally
+        // better to explicitly list the files and directories instead, to insure that
+        // fetching from tarballs, file system paths, and version control all result
+        // in the same contents hash.
+        "",
+        // For example...
+        //"build.zig",
+        //"build.zig.zon",
+        //"src",
+        //"LICENSE",
+        //"README.md",
+    },
+}

src/main.zig

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+const std = @import("std");
+const info = std.log.info;
+const print = std.debug.print;
+const Allocator = std.mem.Allocator;
+
+// otpauth://totp/AWS+Dev?secret=47STA47VFCMMLLWOLHWO3KY7MYNC36MLCDTHOLIYKJCTTSSAMKVM7YA3VWT2AJEP&digits=6&icon=Amazon
+
+pub fn main() !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    const allocator = gpa.allocator();
+    std.log.info("\n\nstart\n", .{});
+
+    const args = try std.process.argsAlloc(allocator);
+
+    std.debug.print("arguments: {s}\n", .{args});
+    const x: Args = try parseArgs(args);
+    print("parsed Args: {?any}\n", x);
+    if (x.add != null) {
+        info("add:", .{});
+        info("name: {s}", .{x.add.?.name});
+        info("secret: {s}", .{x.add.?.secretEncoded});
+
+        const config_location = try configLocation(allocator);
+        info("config location: {s}", .{config_location});
+    }
+}
+
+const Args = struct {
+    add: ?OtpAuthUrl,
+};
+
+const OtpAuthUrl = struct {
+    name: []const u8,
+    secretEncoded: []const u8,
+    url: []const u8,
+};
+
+const ArgumentError = error{InvalidOtpAuthUrl};
+
+fn parseArgs(args: [][:0]u8) !Args {
+    var result = Args{
+        .add = null,
+    };
+    var i: u17 = 1;
+    while (i < args.len) : (i += 1) {
+        const arg = args[i];
+
+        if (std.mem.eql(u8, "--add", arg)) {
+            i += 1;
+            if (i >= args.len) {
+                return error.InvalidOtpAuthUrl;
+            }
+
+            const otpauthUrlCandidate: ?[:0]const u8 = args[i];
+
+            if (otpauthUrlCandidate == null) {
+                return error.InvalidOtpAuthUrl;
+            }
+
+            const index = std.mem.indexOf(u8, otpauthUrlCandidate.?, "otpauth://totp/");
+            if (index != 0) {
+                return error.InvalidOtpAuthUrl;
+            }
+
+            var it = std.mem.splitSequence(u8, otpauthUrlCandidate.?[15..], "?secret=");
+
+            const name = it.next();
+            const secret = it.next();
+            const empty = it.next();
+
+            if (name != null and secret != null and empty == null) {
+                result.add = OtpAuthUrl{ .name = name.?, .secretEncoded = secret.?, .url = otpauthUrlCandidate.? };
+            } else {
+                return ArgumentError.InvalidOtpAuthUrl;
+            }
+
+            //info("{s}", .{name.?});
+            //info("{s}", .{secret.?});
+
+            //std.debug.print("add: {?s}\n", .{otpauthUrlCandidate});
+            //std.log.info("add: {?s}\n", .{otpauthUrlCandidate});
+        } else {
+            std.debug.print("unknown parameter: {s}\n", .{arg});
+            std.process.exit(1);
+        }
+    }
+    return result;
+}
+
+fn configLocation(allocator: Allocator) Allocator.Error![]const u8 {
+    const xdg_config_home: ?[]const u8 = std.process.getEnvVarOwned(allocator, "XDG_CONFIG_HOME") catch null;
+
+    if (xdg_config_home) |base| {
+        const config_location = try std.mem.concat(allocator, u8, &[_][]const u8{ base, "/zig-totp" });
+        info("config_location: {s}", .{config_location});
+        return config_location;
+    }
+
+    const home = std.process.getEnvVarOwned(allocator, "HOME") catch null;
+    const base = home orelse unreachable;
+    const config_location = try std.mem.concat(allocator, u8, &[_][]const u8{ base, "/.zig-totp" });
+    info("config_location: {s}", .{config_location});
+    return config_location;
+}
+
+fn exit(returnValue: u8, message: []const u8) void {
+    std.log.warn("{s}", .{message});
+    std.process.exit(returnValue);
+}

src/root.zig

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+const std = @import("std");
+const testing = std.testing;
+
+export fn add(a: i32, b: i32) i32 {
+    return a + b;
+}
+
+test "basic add functionality" {
+    try testing.expect(add(3, 7) == 10);
+}