example/zig-formatter: show how to use formatters from libghostty (#9407)

example/zig-formatter/build.zig

@@ -0,0 +1,39 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const run_step = b.step("run", "Run the app");
+    const test_step = b.step("test", "Run unit tests");
+
+    const exe_mod = b.createModule(.{
+        .root_source_file = b.path("src/main.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    if (b.lazyDependency("ghostty", .{})) |dep| {
+        exe_mod.addImport(
+            "ghostty-vt",
+            dep.module("ghostty-vt"),
+        );
+    }
+
+    const exe = b.addExecutable(.{
+        .name = "zig_formatter",
+        .root_module = exe_mod,
+    });
+    b.installArtifact(exe);
+
+    const run_cmd = b.addRunArtifact(exe);
+    run_cmd.step.dependOn(b.getInstallStep());
+    if (b.args) |args| run_cmd.addArgs(args);
+    run_step.dependOn(&run_cmd.step);
+
+    const exe_unit_tests = b.addTest(.{
+        .root_module = exe_mod,
+    });
+    const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
+    test_step.dependOn(&run_exe_unit_tests.step);
+}