switch to being a module that can be imported

(although it can't be imported gracefully because of its coupling with raylib)

build.zig

@@ -16,59 +16,47 @@ pub fn build(b: *std.Build) void {
     // set a preferred release mode, allowing the user to decide how to optimize.
     const optimize = b.standardOptimizeOption(.{});
 
-    const exe = b.addExecutable(.{
+    const lib = b.addStaticLibrary(.{
         .name = "zooy",
         // 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" },
+        .root_source_file = .{ .path = "src/lib.zig" },
         .target = target,
         .optimize = optimize,
     });
 
-    // Add raylib
-    raylib.addTo(b, exe, target, optimize); 
+    raylib.addTo(b, lib, target, 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);
+    // 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);
 
     // Creates a step for unit testing. This only builds the test executable
     // but does not run it.
-    const unit_tests = b.addTest(.{
+    const main_tests = b.addTest(.{
         .root_source_file = .{ .path = "src/main.zig" },
         .target = target,
         .optimize = optimize,
     });
 
-    const run_unit_tests = b.addRunArtifact(unit_tests);
+    const run_main_tests = b.addRunArtifact(main_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);
+    // This creates a build step. It will be visible in the `zig build --help` menu,
+    // and can be selected like this: `zig build test`
+    // This will evaluate the `test` step rather than the default, which is "install".
+    const test_step = b.step("test", "Run library tests");
+    test_step.dependOn(&run_main_tests.step);
+}
+
+fn current_file() []const u8 {
+    return @src().file;
+}
+
+const cwd = std.fs.path.dirname(current_file()).?;
+const sep = std.fs.path.sep_str;
+
+pub fn addTo(exe: *std.build.LibExeObjStep) void {
+    exe.addAnonymousModule("zooy", .{ .source_file = .{ .path = cwd ++ sep ++ "src/lib.zig" } });
+    exe.addIncludePath(cwd);
 }

src/lib.zig

@@ -1,7 +1,8 @@
 const std = @import("std");
 
-// TODO: abstract raylib away to allow for consumers to use whatever they want
-const raylib = @import("raylib");
+// TODO: abstract raylib away to allow for consumers to use whatever they want.
+// I'm also rexporting here because the zig build system hurts
+pub const raylib = @import("raylib");
 
 // TODO: don't just make these public
 pub var box_allocator: std.mem.Allocator = undefined;