feat: structure project as a zig library

build.zig

@@ -15,55 +15,33 @@ 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 = "hamt",
         // 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,
     });
 
-    // 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 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);
 
-    // This *creates* a RunStep 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.
-    const unit_tests = b.addTest(.{
+    // Creates a step for unit testing. This only builds the test executable
+    // but does not run it.
+    const main_tests = b.addTest(.{
         .root_source_file = .{ .path = "src/tests.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);
 }

src/lib.zig

@@ -0,0 +1 @@
+pub const HashArrayMappedTrie = @import("trie.zig").HashArrayMappedTrie;

src/main.zig

@@ -1,53 +0,0 @@
-const std = @import("std");
-const HashArrayMappedTrie = @import("trie.zig").HashArrayMappedTrie;
-
-pub fn main() !void {
-    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
-    defer std.debug.assert(!gpa.deinit());
-
-    const allocator = gpa.allocator();
-
-    var trie = HashArrayMappedTrie([]const u8, void, Context(u32)).init();
-    defer trie.deinit(allocator);
-
-    try trie.insert(allocator, "and", {});
-    try trie.insert(allocator, "class", {});
-    try trie.insert(allocator, "else", {});
-    try trie.insert(allocator, "false", {});
-    try trie.insert(allocator, "for", {});
-    try trie.insert(allocator, "fun", {});
-    try trie.insert(allocator, "if", {});
-    try trie.insert(allocator, "nil", {});
-    try trie.insert(allocator, "or", {});
-    try trie.insert(allocator, "print", {});
-    try trie.insert(allocator, "return", {});
-    try trie.insert(allocator, "super", {});
-    try trie.insert(allocator, "this", {});
-    try trie.insert(allocator, "true", {});
-    try trie.insert(allocator, "var", {});
-    try trie.insert(allocator, "while", {});
-
-    try trie.print();
-}
-
-pub fn Context(comptime HashCode: type) type {
-    const Log2Int = std.math.Log2Int;
-
-    return struct {
-        pub const Digest = HashCode;
-
-        pub inline fn hash(key: []const u8) Digest {
-            // the MSB will represent 'z'
-            const offset = @typeInfo(Digest).Int.bits - 26;
-
-            var result: Digest = 0;
-            for (key) |c| result |= @as(Digest, 1) << @intCast(Log2Int(Digest), offset + c - 'a');
-
-            return result;
-        }
-
-        pub inline fn eql(left: []const u8, right: []const u8) bool {
-            return std.mem.eql(u8, left, right);
-        }
-    };
-}

src/tests.zig

@@ -1,4 +1,5 @@
 comptime {
+    _ = @import("lib.zig");
     _ = @import("trie.zig");
 }