Finding and formatting all .zon files in a build.zig b.addFmt() step

squeek502 · May 14, 2025, 4:51am

Have you verified this alone isn’t enough? zig fmt . will format all .zig and .zon files recursively.

$ zig fmt .
./dir/recur.zon
./test.zon

Here’s what the zig build fmt step looks like for the main Zig repository FWIW:

github.com/ziglang/zig

build.zig

bc2f7c754


      
          const fmt_include_paths = &.{ "lib", "src", "test", "tools", "build.zig", "build.zig.zon" };
          const fmt_exclude_paths = &.{ "test/cases", "test/behavior/zon" };
          const do_fmt = b.addFmt(.{
              .paths = fmt_include_paths,
              .exclude_paths = fmt_exclude_paths,
          });
          b.step("fmt", "Modify source files in place to have conforming formatting").dependOn(&do_fmt.step);