Nix Formatter

Nix Formatter applies a deterministic formatting pass to Nix source. It parses the input into an AST, then prints the code with consistent indentation, line wrapping, and spacing. The result preserves semantics while normalizing layout, so expression structure remains identical but whitespace, braces, and attribute alignment are standardized. Beneficiaries include system administrators, developers, and teams managing NixOS configurations.\n\nConceptually, it preserves semantics while normalizing layout, so expression structure remains identical but whitespace, braces, and attribute alignment are standardized. It offers idempotent formatting: formatting an already formatted file yields the same output, producing predictable diffs in version control and easier reviews. Typical use cases include pre-commit formatting, CI checks, and code review workflows. Distinguishing value lies in non-destructive reflow and configurable style options that do not alter runtime behavior.\n\nKey features include non-destructive reflow, optional line width, comment preservation, and diagnostic hints for syntax issues. It is well suited for CI pipelines, code reviews, and collaborative Nix projects where consistency reduces cognitive load and speeds up integration. It does not perform linting or semantic optimization; it focuses strictly on layout and whitespace normalization to improve readability.