Publish dynamic lib (#9)

.github/workflows/publish.yml

@@ -0,0 +1,34 @@
+name: Publish
+
+on:
+  push:
+    tags: ['*']
+
+permissions:
+  contents: write
+
+jobs:
+  build-artifacts:
+    name: Publish artifacts
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Zig Setup
+        uses: goto-bus-stop/setup-zig@v2
+        with:
+          version: "0.12.0-dev.2541+894493549"
+
+      - name: Zig Test
+        run: zig build test
+
+      - name: Zig Dylib
+        run: zig build dylib -Drelease-safe
+
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          files: |
+            zig-out/include/*.h
+            zig-out/lib/*.so

build.zig

@@ -30,11 +30,15 @@ pub fn build(b: *std.Build) void {
         },
     });
 
+    const tag = git_tag(b.allocator) catch @panic("No git tag");
+    const version = std.SemanticVersion.parse(tag) catch (std.SemanticVersion.parse("0.0.0") catch unreachable);
+
     // Static Library
     const lib = b.addStaticLibrary(.{
         .name = "fastlanez",
         .target = target,
         .optimize = optimize,
+        .version = version,
         .root_source_file = .{ .path = "src/lib.zig" },
     });
     lib.bundle_compiler_rt = true;
@@ -44,12 +48,26 @@ pub fn build(b: *std.Build) void {
     // Ideally we would use dlib.getEmittedH(), but https://github.com/ziglang/zig/issues/18497
     _ = lib.getEmittedH(); // Needed to trigger header generation
     const lib_header = b.addInstallFile(.{ .path = "zig-cache/fastlanez.h" }, "include/fastlanez.h");
-    lib_header.step.dependOn(&lib_install.step);
 
     const lib_step = b.step("lib", "Build static C library");
     lib_step.dependOn(&lib_header.step);
     lib_step.dependOn(&lib_install.step);
 
+    // Dynamic Library
+    const dylib = b.addSharedLibrary(.{
+        .name = "fastlanez",
+        .target = target,
+        .optimize = optimize,
+        .version = version,
+        .root_source_file = .{ .path = "src/lib.zig" },
+    });
+    dylib.bundle_compiler_rt = true;
+    const dylib_install = b.addInstallArtifact(dylib, .{});
+
+    const dylib_step = b.step("dylib", "Build dynamic C library");
+    dylib_step.dependOn(&lib_header.step);
+    dylib_step.dependOn(&dylib_install.step);
+
     // Unit Tests
     const unit_tests = b.addTest(.{
         .root_source_file = .{ .path = "src/fastlanez.zig" },
@@ -75,3 +93,17 @@ pub fn build(b: *std.Build) void {
     const bench_step = b.step("bench", "Run benchmarks");
     bench_step.dependOn(&run_bench.step);
 }
+
+fn git_tag(allocator: std.mem.Allocator) ![]const u8 {
+    const result = try std.process.Child.run(.{
+        .allocator = allocator,
+        .argv = &.{ "git", "describe", "--tags", "--always" },
+    });
+    if (result.term.Exited != 0) {
+        std.debug.print("Failed to discover git tag:\n{s}\n", .{result.stderr});
+        std.process.exit(1);
+    }
+    allocator.free(result.stderr);
+    // Strip trailing newline
+    return result.stdout[0 .. result.stdout.len - 1];
+}